tailieunhanh - 2001 Fundamentals Part 8

Tham khảo tài liệu '2001 fundamentals part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 21 PHYSICAL PROPERTIES OF SECONDARY COOLANTS BRINES Brines . Inhibited Glycols . Halocarbons. Nonhalocarbon Nonaqueous Fluids . IN MANY refrigeration applications heat is transferred to a secondary coolant which can be any liquid cooled by the refrigerant and used to transfer heat without changing state. These liquids are also known as heat transfer fluids brines or secondary refrigerants. Other ASHRAE Handbooks describe various applications for secondary coolants. In the 1998 ASHRAE Handbook Refrigeration refrigeration systems are discussed in Chapter 4 their uses in food processing are found in Chapters 14 through 28 and ice rinks are discussed in Chapter 34. In the 1999 AsHrAE Handbook Applications solar energy use is discussed in Chapter 32 thermal storage in Chapter 33 and snow melting in Chapter 49. This chapter describes the physical properties of several secondary coolants and provides information on their use. The chapter also includes information on corrosion protection. Additional information on corrosion inhibition can be found in Chapter 47 of the 1999 Fig. 1 Specific Heat of Calcium Chloride Brines The preparation of this chapter is assigned to TC Refrigerants and Brines. BRINES Physical Properties Water solutions of calcium chloride and sodium chloride are the most common refrigeration brines. Tables 1 and 2 list the properties of pure calcium chloride brine and sodium chloride brine. For commercial grades use the formulas in the footnotes to these tables. Figures 1 and 5 give the specific heats for calcium chloride and sodium chloride brines and are used for computation of heat loads with ordinary brine Carrier 1959 . Figures 2 and 6 show the ratio of the mass of the solution to that of water which is commonly used as the measure of salt concentration. Viscosities are given in Figures 3 and 7. Figures 4 and 8 show thermal conductivity of calcium and sodium brines at varying temperatures and concentrations. Brine .

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