1、3 Vapor refrigeration cycles3.1 One-stage vapor compression systems3.2 Two-stage vapor compression systems3.3 Cascade vapor compression systems3.4 Vapor absorption systems 第三章 蒸汽制冷循環第一節單級蒸氣壓縮制冷循環第二節兩級蒸氣壓縮制冷循環第三節復疊式制冷循環第四節 蒸氣吸收制冷循環8/1/202223 Vapor refrigeration cycles第三章 蒸汽制冷循環Vapor refrigeration cyc

2、lesRefrigeration cycles( Phase change )Gas refrigeration cyclesVapor compression cyclesVapor absorption cycles8/1/202233 Vapor refrigeration cycles第三章 蒸汽制冷循環Refrigeration cycles using pure refrigerantRefrigeration cycles( Component )Refrigeration cycles using mixed refrigerant3.1 One-stage vapor com

3、pression systems3.1.1 Ideal cycles using pure refrigerants3.1.2 Practical cycles using pure refrigerants3.1.3 Practical cycles using mixed refrigerants 3.1.4 Analysis of cycles 第一節單級蒸氣壓縮制冷循環一、純工質理論循環二、純工質實際循環三、混合工質循環四、循環特性分析3.1 One-stage vapor compression systems3.1.1 Ideal cycles using pure refrige

4、rants3.1.1.1 Saturated cycles3.1.1.2 Subcooled cycles3.1.1.3 Superheated cycles3.1.1.4 Recuperative cycles第一節單級蒸氣壓縮制冷循環一、純工質理論循環（一）飽和循環（二）過冷循環（三）過熱循環（四）回熱循環8/1/20226Joule-Thomson effect and J. Perkins ( 1844, American )EvaporatorEtherCondenserCompressorExpansion valves8/1/202273.1 One-stage vapor co

5、mpression systems 第一節 單級蒸氣壓縮制冷循環3.1.1 Systems using pure refrigerants 一、純工質理論循環THTL4123TsOverheated corner8/1/202283.1 One-stage vapor compression systems 第一節 單級蒸氣壓縮制冷循環3.1.1 Systems using pure refrigerants 一、純工質理論循環Overheated corner8/1/202293.1.1 Systems using pure refrigerants 一、純工質理論循環3.1.1.1 Sat

6、urated cycles （一）飽和循環Assumptions1. An isentropic compression2. No temperature diffidence3. Saturated liquid and vapor 4. No pressure loss8/1/2022103.1.1 Systems using pure refrigerants 一、純工質理論循環3.1.1.1 Saturated cycles （一）飽和循環Energy balancesPartsCompressorCondenserExpansionEvaporatorFeaturesq0w0q0,w

7、0w0Relationsw0h2-h1qkh2-h4h4h5q0h1-h5 qkh = q + w8/1/2022113.1.1 Systems using pure refrigerants 一、純工質理論循環3.1.1.1 Saturated cycles （一）飽和循環IndexExpressionInfluence to cycle1q0q0h1-h5Gains2w0w0h2-h1Energy cost300q0/w0Energy cost4000/cEnergy cost5qkqkh2-h4Material cost6qvqvq0/v1Material cost7pkpkps(Tk)

8、Material cost8p0p0ps(T0)Material cost9t2t2f(PR,k)Material cost10PRPRpk/p0Material costqkqk8/1/2022123.1.1 Systems using pure refrigerants 一、純工質理論循環3.1.1.1 Saturated cycles （一）飽和循環IndexR134aR22R717Influence1q0128.5147.01043.1Gains2w042.646.59319.9Energy cost303.0163.1553.2610q0/w04qv872.91595.91673.9

9、Material cost5r0213219.51329qvq0/v16pk1016.41533.61555.5Material cost7p0132.7244.9190.18tc101.196133p0、pk9tf-96.6-160-77.910tb-26.1-40.76-33.311t248.467.6135.2Material cost12PR7.666.268.18t2t1(PR)(k-1)/k13k1.11.21.314Mol102.0386.4817.03k8/1/2022133.1.1 Ideal cycles using pure refrigerants 一、純工質理論循環3

10、.1.1.2 Subcooled cycles （二）過冷循環Assumptions 1. An isentropic compression2. No temperature diffidence 3. Subcooled liquid 4. No pressure loss8/1/2022143.1.1 Ideal cycles using pure refrigerants 一、純工質理論循環3.1.1.2 Subcooled cycles （二）過冷循環IndexExpressionInfluence to cycle1q0q0 = h1 h4 = h1 h4 q0 02w0w0 w

11、0w0 = 0300q0 /w0 0 Beneficial4000 /c 0 5qvqvq0 /v1 qv Beneficial8/1/2022153.1.1 Ideal cycles using pure refrigerants 一、純工質理論循環3.1.1.3 Superheated cycles （三）過熱循環Assumptions 1. An isentropic compression2. No temperature diffidence 3. Superheated vapor 4. No pressure loss8/1/2022163.1.1 Ideal cycles us

12、ing pure refrigerants 一、純工質理論循環3.1.1.3 Superheated cycles （三）過熱循環IndexExpressionsInfluence to cycle1q0q0q0q 0=02w0w0 w 0w 0 0300q0 /w00 Harmful4000 /c0 5q vq vq0 /v1qv 8/1/2022173.1.1 Ideal cycles using pure refrigerants 一、純工質理論循環3.1.1.4 Recuperative cycles （四）回熱循環Assumptions 1. An isentropic compre

13、ssion2. No temperature diffidence 3. Add a recuperative process 4. No pressure loss8/1/2022183.1.1 Ideal cycles using pure refrigerants 一、純工質理論循環3.1.1.4 Recuperative cycles （四）回熱循環IndexExpressionsInfluence to cycle1q 0q0 = h1 h4 = q0 q0 02w0w0 w 0w 0 0400q0 /w0 0 ？Beneficial：R502、R290、R600a、R134aHarmful：R22、R7