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walk-in cooler solution thermodynamics of absorption chiller
author: supermarket refrigerated showcase category: commercial refrigeration Views: 555Time: 2016-08-22
walk-in cooler solution thermodynamics of absorption chiller
walk-in cooler solution thermodynamics of absorption chiller is different from vapor compression chiller, in absorption chiller, The refrigerant is continuously absorbed or released by the liquid solution, and the solution changes in pressure, temperature and concentration during the circulation process, and exchanges heat with the outside world. Solution thermodynamics is the study of the thermodynamic properties of the solution and the change in the state of the solution during heating (or exothermic). Therefore, it is an important thermal theoretical basis for an absorption chiller. Before learning absorption refrigerants, it is necessary to first understand the solution Thermodynamic properties.
(1) Solution, the composition of the solution The uniform and stable system composed of two or more substances is called a solution. Solutions can be divided into gaseous solutions (ie gas mixtures), liquid solutions and solid solutions (or solid solutions). In a liquid solution, the components that can dissolve other substances are called solvents, and the dissolved substances are called solutes. Solutes can be solids (such as lithium bromide), liquids (such as alcohol), and gases (such as ammonia). The solvent is generally liquid (such as water). Commonly used solutions in absorption refrigerators are ammonia-aqueous solution and lithium bromide-aqueous solution, which are composed of two components and are called binary solutions.
(2) Components of the solution The components of the solution represent the percentage of each component in the solution. There are two common representation methods: mass fraction and mole fraction. 1. The mass fraction is the ratio of the mass of a component in the solution to the total mass of the solution. 2. The mole fraction is the ratio of the moles of a component in the solution to the total moles of the solution.
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