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1、1Lesson SevenRefrigeration and Refrigerants2TopicsRefrigeration theory and evaluate1Air pollution by Refrigerants2Compressors3 34 4Text and key words learning Usages and Expressions3 53Refrigeration and heat pumpHigh temperatureLow temperatureRefrigerationEnergyTHTLQHQLHigh temperatureLow temperatur
2、eHeat pumpEnergyTHTLQHQLSummerindooroutdoorWinteroutdoorindoorTopic one: Refrigeration theory and evaluate4vapor compression system56Indoor heat exchangerCompressorExpansion valve四通换向阀Four-way Reversing Valve Outdoor heat exchanger7EntropyAbsolute temperature1234Theoretical Vapor Compression Refrige
3、ration Cycle1-2 The cold saturated vapor at state 1 is compressed isentropically to the high temperature in the cycle at state 2. 2-3 The cycle is completed by an isothermal and isobaric heat rejection or condensing process from state 2 to state 3.3-4 Saturated liquid at state 3 expands isenthalpica
4、ly to the low temperature and pressure of the cycle at state 4.4-1 Heat is added isothermally and isobarically by evaporating the liquid phase refrigerant from state 4 to state 1.EnthalpyPressure12348COP: Coefficient of PerformanceEER: Energy Efficiency RatioHSPF: Heating Seasonal Performance Factor
5、SEER: Seasonal Energy Efficiency Ratio9absorption systemwater lithium bromide ammonia water1011Ozone Depletion !反应输入物反应产物反应催化剂Topic two: Air pollution by Refrigerants12decrease increasetemperature increaseatmosphereearthGlobal Warming !Greenhouse gases 13141. Refrigeration and Refrigeration Systemsd
6、efinition & classification of Refrigeration Systems2. Refrigerants, Cooling Mediums, and Absorbentsdefinition & standard refrigerant designations3. Classification of Refrigerantsclassification of refrigerants based on ozone depletion4. Phase out of CFCs, BFCs, HCFCs, and Their Blendshistory of the p
7、hase out some alternativesTopic Four: Text learning and keywords15refrigeration 制冷 refrigeration system 制冷系统 refrigerant 制冷剂 cooling medium 冷却介质 vapor compression system 蒸气压缩式系统 absorption system 吸收式系统 gas expansion system 气体膨胀式系统 ozone depletion potential (ODP) 臭氧消耗潜能 global warming potential (GWP)
8、 全球变暖潜能 absorbent 吸收剂 brine 盐水 hydrocarbon 碳氢化合物 halocarbon 卤代烃 phaseout 逐步停用或淘汰 alternative 替代物 Hydrofluorocarbons (HFCs) 氢氟烃 Hydrochlorofluorocarbons (HCFCs) 氢氯氟烃 Chlorofluorocarbons(CFCs) 氯氟烃 Bromofluorocarbons(BFCs) Halons 溴氟烃 HC（ Hydrocarbon） 碳氢 FC（Fluorocarbon） 氟烃 azeotropic 共沸的 nonazeotropic
9、非共沸的Topic Five: Text learning and keywords161. Refrigeration is the cooling effect of the process of extracting heat from a lower temperature heat source, a substance or cooling medium, and transferring it to a higher temperature heat sink, probably atmospheric air and surface water, to maintain the
10、 temperature of the heat source below that of the surroundings.2. A refrigeration system is a combination of components, equipment, and piping, connected in a sequential order to produce the refrigeration effect.cooling effect: 冷却作用 heat source: 热源 heat sink: 热汇 cooling medium: 冷却介质 surrounding: (周围
11、)环境in a sequential order: 顺序的 refrigeration effect: 制冷效应173. The compressed refrigerant is condensed into liquid form by releasing the latent heat of condensation to the condenser water.4. Liquid refrigerant is then throttled to a low-temperature vapor, producing the refrigeration effect during evap
12、oration.5. After liquid refrigerant produces refrigeration during evaporation at very low pressure, the vapor is absorbed by an aqueous absorbent.latent heat: 潜热 sensible heat: 显热 condenser water: 冷却水aqueous: 水的 水成的 absorbent:吸收剂 吸收的throttle: 节流 节流阀 expansion valve: 膨胀阀186. The solution is heated by a direct-fired gas furnace or waste heat, and the refrigerant is again vaporized and then condensed into liquid form.7. A refrigerant is a primary working fluid used to produce refrigeration in a refrigeration system.8. All refrigerants extract heat at low temperature and low pressu
