The color, aroma, taste and nutrients of frozen products are kept more. Fast processing. To prevent the raw materials from being piled up and acidified, the freshness of raw materials is the primary factor that determines the color and fragrance of green vegetables. The raw materials are fresher. The quality of frozen products in supermarket display cooler display cooler is also better. Therefore, the shorter the time from picking to processing, the better. Picking should be done in a timely manner. Chlorophyll is damaged and fading; prevents tissue aging, flavor deterioration, and even peculiar smell.

　　Supermarket display cooler display cooler Prevents the destruction of chlorophyll and vitamin a of green vegetables by ester oxidase. They vary depending on the types of green vegetables such as leafy vegetables and beans. If the blanching time is insufficient, the blanching temperature and time of the raw materials is an important part of maintaining the color, aroma and taste of vegetables. Blanching is to blanch the raw vegetables in boiling hot water for a few seconds to a few minutes to pick up and cool. Its main function is to destroy the oxidase activity in vegetables. Supermarket display cooler display cooler prevent quick-frozen vegetables from oxidation and discoloration and produce peculiar smell. Suitable temperature and time for blanching. Enzyme activity remains in the vegetables. Enzymatic browning reaction will occur during the cold storage process, which will make the frozen vegetables turn green and yellow and reduce the flavor of the frozen products. If the blanching time is too long, the green vegetables will turn yellow. This is because the green color of vegetables is composed of mixed pigments of chlorophyll and carotene, and chlorophyll is easily decomposed by acid, alkali and enzymes. In the case of excessive blanching, the organic acids dissolved in the water and chlorophyll react to produce pheophytin, which makes the vegetables lose their bright green color, and turn into yellow-green or even yellow-brown. The vegetable tissue becomes less brittle and the flavor becomes weaker. , And loss of local soluble nutrients. Therefore, the blanching water must be frequently updated or adjusted with an appropriate amount of sodium bicarbonate aqueous solution to control the water quality within the range of pH 7 to 8 to achieve the purpose of color retention.

　　The cooling medium temperature should be low. It is best to use sanitary block ice water cooling, and the vegetables should be cooled in time after cooling and blanching. Supermarket display cooler display cooler should be fast. After blanching, immediately move it to -3℃~-5℃ cooling pool to cool thoroughly. To ensure a bright green color and a good fragrance. If it is not cooled in time or the temperature of the cooling medium is not low, the vegetables will continue to be affected by high temperature after blanching, the texture will soften, and the color will deteriorate. Even if frozen or refrigerated, the frozen vegetables will gradually turn yellow and produce peculiar smell.

　　 flow-type freezing machine is a relatively advanced equipment for rapid freezing of monomers. Supermarket display cooler display cooler The box is equipped with a mesh conveyor, air cooler and evaporator. The cold source enters the evaporator in the freezing cabinet from the liquid supply pipe in the refrigeration room, currently. It has a thermal insulation box. Under the blow of the air cooler, the freezing temperature is maintained at -35℃~-40℃. The raw material is placed on the horizontal mesh screen and enters the freezing room. The liquid ammonia exchanges the heat from the raw material layer. Driven by the high-speed cold air flow, the raw material creeps forward and freezes from time to time.

　　The temperature detection and voice temperature reporting circuit of medical commercial refrigeration is set in the body of the low-temperature refrigeration equipment. Compared with the prior art, the utility model low-temperature refrigeration equipment with voice temperature reporting function has reasonable design, simple structure, easy processing, low production interest, and convenient use. The structure of the refrigeration equipment is temperature detection and voice temperature reporting. Circuit and low-temperature refrigeration equipment body composition. And it is not affected by ambient light, which brings convenience to users. And the price of medical commercial refrigeration is reasonable.

　　Medical commercial refrigeration There is a compressor maintenance shell at the top of the box, and the refrigeration equipment includes the box of the refrigeration equipment. There are compressors and capillary tubes in the shell, condensers for heat dissipation are attached to the outer wall of the box, and evaporators for refrigeration are attached to the inner wall of the box. When the refrigeration equipment is used, cover the refrigeration equipment on the products to be preserved. The refrigeration equipment is in full contact with the table to form a completely enclosed refrigeration space. Then plug in the power source, the compressor starts to work, and the refrigerant passes through the capillary tube to the evaporator. Refrigeration, medical commercial refrigeration Because the evaporator is on the inner wall of the box that is above the food, it can quickly cool the refrigerated space, and achieve the purpose of refrigeration. The refrigerant passes through the condenser on the outer wall of the box to dissipate heat, and finally returns to the compressor, which achieves the effect of refrigeration . Therefore, the price of refrigeration equipment for medical commercial refrigeration is determined.

　　Medical commercial refrigeration especially involves refrigerators, incubators, commercial refrigeration and other refrigeration equipment. The utility model includes a refrigerating chamber and a refrigerating device, and the refrigerating equipment relates to refrigeration technology. Medical commercial refrigeration is characterized in that it also includes an atomizing device. The beneficial effect of the utility model is that since the enthalpy value of the liquid substance is much higher than that of the gas, the utility model adopts atomized water as the heat exchange medium, which improves the heat exchange speed, that is, increases the refrigeration speed of the refrigeration equipment and expands the refrigeration The scope of application of the equipment enables it to meet the strict refrigeration requirements of special items such as medicines, improve refrigeration efficiency, and achieve energy-saving effects. At the same time, if atomized water is used as the medium, the humidity in the refrigerator compartment can be increased.

　　 usually the pork core temperature in the supermarket refrigerated showcase is reduced to about 0℃~1℃. The specific requirement is to cool the meat before putting it into commercial refrigeration: it is mainly used for short-term storage of meat. The temperature in the commercial refrigeration should be lowered to about minus 4℃, and after the meat is put into the warehouse, it should be kept between -1℃ and 0℃. Pork cooling time is 24 hours and can be stored for 5-7 days. After cooling, a dry film is formed on the outside of the meat, which prevents the growth of bacteria, slows down the evaporation of water, and prolongs the storage time.

　　 freeze most of the water in the pork into ice, frozen meat: fast and deep freeze the meat. This meat is called frozen meat. Frozen meat is more durable than chilled meat. The freezing of pork in the supermarket refrigerated showcase generally adopts the temperature below -23℃ and stores around -18℃. Commercial refrigeration In order to improve the quality of frozen meat and restore its original taste and nutritional value after thawing, most commercial refrigerations currently use the quick-freezing method, which means putting the meat in a quick-freezing room at -40°C to quickly reduce the meat temperature to Below -18℃, then move it into the refrigerator.

　　 The pork in the supermarket refrigerated showcase mainly uses salt to increase the osmotic pressure of the meat. The salt curing method: the storage effect of the salt curing method. It removes part of the water and reduces the oxygen content in the meat, resulting in environmental conditions conducive to the growth and reproduction of bacteria. However, some bacteria have strong salt tolerance, and salt curing alone cannot achieve the purpose of temporary storage. Therefore, salt curing is mostly carried out at low temperature in production, and salt curing and drying are often used in combination to produce various flavors. Meat products.

　　 supermarket refrigerated showcase or commercial refrigeration, low-temperature storage method: low-temperature storage method is the cold storage of meat. The most practical method in the storage of meat and meat products. Under low temperature conditions, especially when the temperature drops to minus 10°C, the moisture in the meat freezes, creating an environment where bacteria cannot grow and develop. But when the meat is thawed and recovered, the bacteria begin to grow and multiply due to the increase in temperature and the seepage of meat juice. Therefore, when using low-temperature storage of meat, you must maintain a certain low temperature until it is eaten or processed, otherwise the quality of the meat cannot be guaranteed. The cold storage of pork in the supermarket refrigerated showcase can be divided into two types: chilled meat and frozen meat. Carried out in cold storage or commercial refrigeration, low temperature storage method: low temperature storage method is the cold storage of meat. The most practical method in the storage of meat and meat products. Under low temperature conditions, especially when the temperature drops to minus 10°C, the moisture in the meat freezes, creating an environment where bacteria cannot grow and develop. But when the meat is thawed and recovered, the bacteria begin to grow and multiply due to the increase in temperature and the seepage of meat juice. Therefore, when commercial refrigeration uses low-temperature storage of meat, a certainLow temperature until it is eaten or processed, otherwise the quality of the meat cannot be guaranteed. The cold storage of meat can be divided into two types: chilled meat and frozen meat.

　　 Supermarket watermelon preservation technology is also an effective way to solve market supply. The supply time of watermelon can be adjusted by cultivation methods (such as early spring, delayed autumn, and maintenance cultivation) and the transfer of north and south. Currently. Use modern small supermarket display cooler. Equipped with mechanical cooling equipment. Supermarket display cooler artificially adjusts and controls the temperature, humidity and gas composition in the storage environment, in a well-insulated building warehouse. display cases According to the storage characteristics of watermelon. In order to extend the shelf life of watermelons. For example, Fengshou No. 1, disease-resistant Heijuba and other mid- and late-maturing varieties can be stored for 20 to 60 days and have good commercial performance and considerable benefits. The specific operating procedures are as follows:

　　 Variety selection: different varieties of watermelon. Should choose the mid-late maturity resistant species. It has good flavor and bright color, and its structure and chemical composition are different. The tissue structure and chemical composition of the same watermelon variety have obvious changes due to the influence of growth environment factors. display cases are used to store fresh watermelons. It has a high sugar content. The melon vine and fruit noodles are free of pests and diseases. The suitable temperature for storage of watermelon in supermarket display cooler is 5~6℃. Should be used after gradually cooling down. In order to reduce the physiological diseases of watermelon, especially in the early storage period. Then transfer to normal storage. display cases Improve storage quality. When taking out watermelon from supermarket display cooler in summer or autumn, water droplets are easy to condense on the surface of the melon, and the shelf life is very short after delivery, so the temperature of the watermelon should be gradually increased before delivery, so that the temperature of the watermelon gradually rises to an appropriate temperature before delivery. Conducive to ensuring quality and extending shelf life.

　　 pre-cooling means to cool the watermelon product temperature to the specified temperature range as soon as possible before entering the display cases. After being picked, they are stacked in the field. Store in before the temperature rises in the early morning. Put it in the supermarket display cooler and use the refrigerator to circulate the cold air within 1 week to better maintain its original quality. The easiest way to pre-cool. Use low temperature at night to pre-cool. Supermarket display cooler uses heat conduction and latent heat of evaporation to cool the watermelon so that the temperature of the watermelon is the same as that of the display cases. The general temperature is 8~12℃, the relative humidity is about 80%, and the lowest storage temperature can be controlled at 5~6℃. The suitable relative humidity for cold storage of watermelon is 80-85%. From time to time, the frost was washed away. As a result, the humidity in the warehouse is reduced, and the evaporator tube of the supermarket display cooler often forms frost from time to time. And multi-use cement materials for buildings. If watermelon does not meet the humidity requirements, you can sprinkle clean water on the ground or spread wet grass curtains.

　　 In the past, natural refrigeration was used. This method often causes serious losses due to the temperature fluctuations after storage. Refrigerated in small packages, coriander, spinach, and celery are cold-resistant leafy vegetables. The method is simple, the storage period is long, the quality is good, and the economic benefit is high. Using this method to store coriander for 3 months, the commodity rate is more than 90%; for spinach for 2 months to 3 months, the commodity rate is 80%-90%, and for celery for 2 months, the commodity rate is about 90%.

　　 In this regard, the professional training goal of refrigeration technology magazines in the supermarket refrigerated showcase and fruit and vegetable preservation supermarket refrigerated showcase: to cultivate high-level technical application professionals engaged in the installation, commissioning, maintenance and management of refrigeration and refrigeration systems and equipment.

　　 and the main characteristic courses and practical links of each school. Refrigeration technology magazine professional core courses and main practical links of supermarket refrigerated showcase and fruit and vegetable preservation supermarket refrigerated showcase: mechanical drawing, engineering mechanics, electrical and electronic technology, fluid mechanics and heat transfer, mechanical foundation, refrigeration principle, refrigeration machinery and equipment , Food cold processing technology, refrigeration equipment automation, refrigeration equipment installation management and operation, small refrigeration equipment, cold storage design, metalworking practice, basic electronic technology training, refrigeration and air conditioning measurement and control technology training, central air conditioning system operation management training, refrigeration equipment installation And maintenance training, graduation design, etc. Professional directions that can be set: refrigeration equipment maintenance; refrigeration and cold storage system application.

　　 But during this period, you should always pay attention to the quality inspection of supermarket refrigerated showcase fruit and vegetable preservation, and the inspection and sales of cold storage technology magazine: for parsley, spinach, and celery during storage. If black leaves and yellow leaves are found to be processed in time, a constant temperature is required in the warehouse. The lower the temperature is, the better if it is not frozen. The storage temperature of coriander and spinach can be lower, that is, the stems and leaves should be frosted. .

　　Supermarket refrigerated showcase Fruit and vegetable preservation supermarket refrigerated showcase The core courses and main practice links of refrigeration technology magazine: mechanical drawing, engineering mechanics, electrical and electronic technology, fluid mechanics and heat transfer, mechanical foundation, refrigeration principle, refrigeration machinery and equipment , Food cold processing technology, refrigeration equipment automation, refrigeration equipment installation management and operation, small refrigeration equipment, cold storage design, metalworking practice, basic electronic technology training, refrigeration and air conditioning measurement and control technology training, central air conditioning system operation management training, refrigeration equipment installation And maintenance training, graduation design, etc. Professional directions that can be set: refrigeration equipment maintenance; refrigeration and cold storage system application.

　　 supermarket refrigerated showcase There are compressors and refrigeration pipes under the cabinet. The upper part is a fresh-keeping cabinet. The door of the supermarket freezing display walk-in cooler is a glass door. The display walk-in cooler is equipped with a food display board. The size of the display board is stepped. The utility model uses a movable glass door. Planting vegetable food is clear at a glance, and at the same time it isolates dust, flies, mosquitoes and other pollution, and is clean and hygienic; the compressor is used for refrigeration and preservation to prevent food from changing and has a good fresh-keeping effect. Glass door supermarket freezing display walk-in cooler glass door condensation problem in use. The design plan is to display the walk-in cooler in the glass door supermarket. The lower refrigeration system is equipped with an axial fan, a deflector, and an anti-condensation glass door double basin display cabinet. As a result, the hot air emitted by the condenser is blown to the outside of the glass door to form an air curtain, so that the glass door of the glass door supermarket displaying walk-in cooler does not produce condensation, and the heat resources are effectively used. The price of the supermarket refrigerated showcase and the price of the walk-in cooler of the supermarket refrigerated showcase have also changed.

　　The lighting device for the walk-in cooler of the supermarket refrigerated showcase is set on the box surface frame inside the supermarket refrigerated showcase. Since the device position of the lighting device of the present invention is based on the box surface frame structure of the walk-in cooler of the supermarket frozen display, a double basin display cabinet with a novel lighting device. The interior of the supermarket refrigerated showcase is equipped with an embedded lighting device at the box surface frame. The lighting control device and wires are all installed inside the cabinet, so that the walk-in cooler of the frozen display has a more concise and beautiful appearance; adopts the structure of the utility model , Which is simplified to the installation process of the lighting lamp, and does not occupy the use space of the supermarket frozen display walk-in cooler.

　　 refrigerated showcase Refrigeration Equipment Co., Ltd. is a commercial refrigeration equipment enterprise integrating R&D, design, production and sales. The company has a group of middle and senior designers; owns domestic first-class production equipment, adopts advanced production technology, strict quality control system and modern management methods, plus strict training of first-line production technicians to ensure every production Taiwan products are of high quality.

　　With the continuous expansion of the company's production capacity and scale, we rely on our domestic advanced refrigeration technology, strict quality inspection procedures, humanized management experience, combined with industry refrigeration advantages, and our products not only meet domestic needs, but also successfully penetrate the international market. Convenience stores have been formed. Supermarket. Kitchen cabinets. There are four series of refrigeration equipment in the cake room, more than 100 varieties of products. In 2013,   believes that the price of refrigerated showcase supermarket refrigerated showcase and the price of supermarket frozen walk-in cooler will also be the most reasonable and favorable.

　　With the rapid development of the domestic retail industry. Supermarkets and department stores are gradually disrupting the retail business structure. Product sales management analysis: recent years. Market competition is becoming increasingly fierce. New retail formats continue to emerge. The development of these different types of formats has made competition increasingly fierce. The emerging supermarkets display display cases, chain stores and low-price supermarkets have become people's main sales outlets; and the development of emerging business forms has also made market divisions more and more refined, and the business structure has become more and more complete , Which has also promoted the retail industry to take a big step forward in the development of chain, specialization and internationalization. The development of supermarket display cases of community chain supermarkets has become an indispensable form of retail, and large and medium-sized cities are increasingly paying attention. However, because community supermarkets are geographically dispersed and convenient for centralized management, it is easy to cause various problems, and shelf display management is a more prominent problem.

　　 and the supermarket should also adjust the supermarket display cases and product configuration tables in time. The salesperson is responsible for collecting qualitative information related to the display cases of the supermarket and the commodity configuration table. And analyze it, the decision support system (DSS collects all quantifiable data (mainly sales data provided by the POS system) from each store through a highly developed information system in real time and based on its intelligent analysis. For example, News, policies, customer opinions and suggestions, etc. Relying on our own rich experience and good business sense to transform it into quantitative information, and revise the relevant parameters of the commodity configuration table made by the decision support system. New product introduction, slow sales Product elimination, product sales promotion, and product adjustments when changing seasons all have corresponding sequence processes to adjust the product configuration table.

　　 must combine regular and irregular two methods to conduct sampling visits to subordinate stores. After analysis, the supermarket display cases Sent to the commodity management headquarters in the form of a written speech. The store is responsible for strictly managing the merchandise arrangement in accordance with the merchandise allocation table. The area will receive copies of the merchandise allocation form of all stores in the area. It also regularly summarizes the implementation of the merchandise allocation table by the subordinate stores. Directly report emergency speeches and customer feedback information to the merchandise management headquarters.

　　 supermarket display cases The merchandise is arranged neatly. After a brief analysis, it is reported to the merchandise management headquarters; when special circumstances occur, the store must pay attention to the merchandise when managing the shelves The principle of furnishings. Easy to take and put. Product adjustments should be timely. Stores need to have specialized personnel to regularly collect customer feedback on shelf arrangements and some opinions and suggestions. It will cause abnormal fluctuations in the relevant market, and store personnel must be timely and detailed Report the relevant situation to the headquarters so that the supermarket display cases can adjust the product configuration table in time to adapt to the market fluctuations.

Raw. Therefore, strict temperature management in the series of receiving, inventory, processing, display, and sales processes is crucial to maintaining the freshness of walk-in cooler meat.

　　 tea fresh-keeping supermarket refrigerated showcase and frozen storage supermarket refrigerated showcase including refrigeration system. Supermarket refrigerated showcase and cabinet. The cabinet is rectangular, divided into three parts, the upper part is the assembly space of the refrigeration system, and the lower part is arranged side by side with the refrigerating room and the freezing room. The frozen storage supermarket refrigerated showcase provided by the utility model makes the overall structure more compact by adjusting the structure of the existing tea fresh-keeping supermarket refrigerated showcase and the position of each component of the refrigeration system. Not only can it be placed against a wall, but it can also be placed on a table or wall-mounted. The price of a supermarket refrigerated showcase should also be judged according to various aspects of quality.

　　 can introduce the cold air in the frozen storage supermarket refrigerated showcase to the inside of the ice making room. The tea fresh-keeping supermarket refrigerated showcase includes a freezing room for freezing and preserving food; a refrigerating room for storage; the freezer can be selectively opened and closed The freezer compartment door and the refrigerator compartment door open at the front end of the refrigerator compartment are arranged inside the side walls of the refrigerator compartment. In addition, there is a cold air channel with positioning ribs that can be positioned in the middle of the side wall of the supermarket refrigerated showcase. The frozen storage supermarket refrigerated showcase is a cold air channel for guiding cold air inside the main body, so that part of the cold air provided to the inside of the freezer can be provided to the ice making room, so there is no need to install other equipment for ice making, and can Improve the utilization rate of air-conditioning. In addition, the positioning ribs provided on the cold air channel can make the cold air channel arranged in the side wall of the refrigerating chamber be located in the middle position, thereby keeping a certain distance between the cold air channel and the inner shell and the outer shell, so as to fill the tea freshness supermarket refrigerated The flow of foaming liquid in the side wall of the showcase refrigerator compartment is more smooth. It also makes the price of supermarket refrigerated showcase more perfect.

　　Tea fresh-keeping supermarket refrigerated showcase An ice making room that can make ice using the cold air generated by the freezer compartment evaporator and introduced from the freezer compartment to the inside. Frozen storage The supermarket refrigerated showcase is to set up the ice making room for ice making on the door of the refrigerator compartment, and the supermarket refrigerated showcase has a superma with an ice making room on the door.rket refrigerated showcase. It includes a freezer compartment for freezing and preserving food; a refrigerator compartment for refrigerating and preserving tea; a refrigerator cabinet door for opening and closing the front opening of the refrigerator compartment; and it is set inside a supermarket refrigerated showcase for keeping tea fresh. In this way, the user can use the dispenser to conveniently take out the ice cubes as needed, and can reduce the parts such as the evaporator and fan motor for ice making, reduce production costs, simplify the assembly process, and improve production efficiency. In addition, by reducing the number of parts installed inside the ice making chamber, the space inside the ice making chamber can be increased, so that a larger number of ice cubes can be stored, and the size of the ice making chamber can be set more reasonably. Expand the storage space of the refrigerator door or refrigerator compartment.

　　Frozen storage The supermarket refrigerated showcase is equipped with independent insulation layers on four sides, and the supermarket refrigerated showcase is set in the refrigerator compartment. There is a gap with the insulation layer on the four sides of the refrigerator compartment. The tea fresh-keeping supermarket refrigerated showcase of the utility model has the characteristics of simple structure, high efficiency and energy saving, and solves the problem of large cold loss in the freezer compartment of the existing supermarket refrigerated showcase. It can be widely used in various types and styles of tea fresh-keeping supermarket refrigerated showcase, especially suitable for large-volume supermarket refrigerated showcase. The price of supermarket refrigerated showcase will also be more reasonable.

　　 lotus root storage is more difficult, especially lotus root slices, lotus root body has no rust spots, raw material selection: lotus root should be white, fresh lotus root. No redness, purpleness, no pests. In display cases, the surface of the lotus root slices will soon be covered by a layer of transparent ice. The lotus root slices after hanging the ice coat should be immediately bagged, sealed, boxed and placed in display cases for refrigeration. Use a soft brush or soft cloth to clean the surface of the lotus root. Pretreatment of raw materials: raw material cleaning. Immerse the selected raw materials into a clean water tank.

　　 In order to preserve the lotus root, in addition to putting it in the display cases, there must be a certain method before that. Specifically, you need to use a stainless steel knife to cut the lotus root into sections and cut off the lotus root section by section. Knotted and peeled. The lotus root will be washed. Then use a sharp small planer to remove the outer thin skin. Prevent exposure of the liquid surface and protect the color. The peeled lotus root section is immersed in 1.0% refined salt solution or 1.5% citric acid solution in time. Soak for 15 minutes to prevent discoloration. The sheet shape should be intact. The sliced ​​lotus root should be blanched and sliced ​​as soon as possible. Use a sharp stainless steel blade to cross-cut the lotus root into thin round pieces of 8 mm-10 mm thick. The thickness should be even. If it cannot be blanched for a while, soak the lotus root slices in a 1.5% saline solution for temporary preservation of color. Cook for about 2 minutes. Hot. The main equipment is a jacketed pot or a spiral continuous blanching machine. The blanching water must be added with 0.1% citric acid to adjust the pH value of the water for color protection. The blanching temperature is controlled at 98~100℃.

　　 then immerse in a cooling water tank below 5℃ to cool. Make the center temperature of lotus root slices drop below 10℃ at the fastest speed. cool down. Put the scalded lotus root slices immediately into the flowing cold water pool to be repeatedly cooled to the core or after being sprayed with cold water to cool down. Remove the discolored and severely damaged lotus root slices while draining the water. Draining and selection: After cooling, the lotus root slices should be drained. Then put it in the display cases and freeze at -30~-35℃, and quick-freeze: the lotus root slices are rinsed and disinfected with high-pressure water gun before quick-freezing. The freezing time is 10-12 minutes. The center temperature of

　　 lotus root slices in the display cases is below -18℃. Take 2~3 kg each time and place them in a perforated plastic basket, and hang the ice coat: the ice coat is to wrap the surface of the lotus root slices with a layer of transparent thin ice. The specific method is to freeze the lotus root slices. Dip the basket together with the container into cold sanitary drinking water at about 2°C for a while (about 2~3 seconds), shake the basket quickly, then lift it up and drain the water droplets.

　　  refrigeration cycle or a substance used for direct cooling like commercial display cases medical walk-in cooler   HVAC industry outsiders may describe refrigerant as a certain fluid used in air conditioners. Many people in the HVAC industry will immediately think of CFC group substances (chlorofluorocarbons)

　　 commercial display cases, medical walk-in coolers, and absorption chillers. Carbon dioxide (CO2 and ammonia (NH3) are known as   natural   refrigerants. Flammable substances such as propane and isobutane are also used as refrigerants. Commercial display cases For halogenated hydrocarbon substances such as CFC, these definitions are all Yes, but refrigerants are more extensive than those. Water is a refrigerant. HCFC and HFC group substances are more widely welcomed refrigerants. ASHRAE Standard 34 Nomenclature and Safety Classification of Refrigerants Lists more than 100 refrigerants, Although many of them are not used in conventional commercial HVAC.

　　 commercial display cases medical walk-in cooler refrigerant is a vapor compression system. Carbon dioxide (CO2 and ammonia (NH3) were first used as refrigerants in 1866 and 1873, respectively Other chemicals include chemical cyanide (petroleum ether and naphtha), sulfur dioxide (R-764 and methyl ether), refrigerant development history: mechanical refrigeration appeared in the mid-nineteenth century. Jacob Perkin (Jacob Perkin built in 1834) The first practical machine. It uses ether as a refrigerant. It was once used as a vapor compression refrigerant. Its application is limited to industrial processes, commercial display cases and medical walk-in coolers. Most food is still stored in ice collected in winter or industrially prepared.

　　commercial display cases Medical walk-in cooler refrigeration systems began to be used as air conditioning means for large buildings. The Merlin Building in San Antonio, Texas was the first fully air-conditioned high-rise office building in the early twentieth century. R-12 was used. The CFC family (chlorofluorocarbon) is non-flammable, non-toxic (compared to sulfur dioxide) and high energy efficiency. The machine began commercial production in 1931 and soon entered the home. Willis. Carri (WillisCarri developed the first Commercial centrifugal refrigerators ushered in the era of refrigeration and air conditioning. In 1926, Thomas Midg developed the first CFC chlorofluorocarbon machine.

　　 commercial display cases medical walk-in cooler series of halogenated hydrocarbon refrigerants Appeared one after another in the 1930s. DuPont named it Freon (Freon). These substances have excellent performance, non-toxic, non-flammable, and can adapt to different temperature regions, significantly improving the performance of refrigerators. Several refrigerants are used in air conditioners. It has become very common, including CFC-11CFC-12CFC-113CFC-114 and HCFC-22. In the 1950s, azeotropic refrigerants began to be used. In the 1960s, non-azeotropic refrigerants began to be used. .196 In three years, the air-conditioning industry has grown from an infancy to a multi-billion dollar industry. These refrigerants account for 98% of the entire organic fluorine industry output.

　　 Vegetables and fruits preservation display cooler There is an ozone generator in the body. The ozone sheet of the output port of the ozone generator is arranged in the air duct at the bottom of the humidifier or in the closed ozone channel leading from the humidifier to the bottom of the water tank. It constitutes an ultrasonic vegetable fresh-keeping humidifier with an ozone generator. The price of display cooler is therefore more affordable. The utility model integrates the function of a humidifier and the function of an ozone generating device. The ultrasonic vegetable fresh-keeping humidifier with the ozone generating device includes an ultrasonic humidifier. It can produce ozone while the humidifier is working, which not only moisturizes the air, but also purifies the air, removes peculiar smells, and causes bacteria to grow.

　　 vegetable and fruit fresh display cooler humidifier includes: external water tank, built-in water tank, heater, ultrasonic atomization generator, power supply; low power consumption, of which the external water tank and the built-in water tank are located outside the enclosed space to be humidified. Inside; the connecting pipe connects the external water tank and the built-in water tank; the heater connected to the power supply is located in the external water tank; the ultrasonic atomization generator connected to the power supply is located in the built-in water tank; the humidifier also includes: a liquid feedback level signal Surface sensor, temperature sensor and controller that feedback water temperature signal. The beneficial effect of the display cooler for keeping vegetables and fruits fresh is that the utility model has a simple structure. The voltage below 36V is safe and reliable, and the cost is low; the water atomization effect is good, and the humidification efficiency is high. The display cooler humidifier can store water for vegetables and fruits without destroying the gasification environment in the air conditioning warehouse and cold storage. The specific price of display cooler is also related to the following factors.

　　 vegetable and fruit fresh-keeping display cooler humidifier includes rack, nozzle, water pump, water valve, air pump, air valve, air purifier, carbon dioxide extraction machine, oxygen extraction machine, and nitrogen generator. The airbags are connected to the carbon dioxide extraction machine, the oxygen extraction machine, and the nitrogen generator respectively. The airbag is also equipped with two pipelines connected with the preservation warehouse. One of the pipelines is equipped with an air pump and an air valve, and an air pump and an air The pipeline of the valve communicates with a pipeline connected to a water source with a water pump and a water valve, and the end of the pipeline is provided with a nozzle. Compared with the prior art, the vegetable and fruit fresh-keeping display cooler can effectively ensure the stability of the air humidity in the air-conditioned fresh-keeping warehouse and the concentration of each gas in the air-conditioned storage environment, and has a simple structure and convenient operation. The air outlet of the

　　 ozone generator is set on the air outlet channel of the vegetable fresh-keeping humidifier, and the ozone is removed from the air outlet channel by a fan. This vegetable and fruit fresh-keeping display cooler has a simple and practical structure design. It makes full use of ozone to clean the air and disinfect water. It can humidify the air while removing peculiar smell and disinfection. Multiple functions are integrated, and the cost is reduced. A multifunctional display cooler humidifier with ozone generator for fresh-keeping vegetables and fruits. So that the price of display cooler is more reasonable.