1、制冷系統(tǒng)組成,Vapor-Compression Refrigeration,expansiondevice,condenser,compressor,evaporator,第一部分制冷循環(huán),制冷系統(tǒng)組成,A,B,壓力,焓,蒸發(fā),制冷循環(huán),A,C,compressor,pressure,enthalpy,evaporator,制冷循環(huán),B,A,condenser,pressure,enthalpy,evaporator,制冷循環(huán),B,C,compressor,D,expansion device,A,D,condenser,pressure,enthalpy,evaporator,制冷循環(huán),B

2、,C,compressor,第二部分 冷凝器,制冷系統(tǒng)組成,subcooler,outdoor air,condenser coil,propeller fan,風(fēng)冷式冷凝器,A,D,pressure,enthalpy,B,C,Effect of Subcooling,AI,subcooling,refrigeration effect,DI,離心式風(fēng)扇-風(fēng)冷式冷凝器,centrifugal fan,condenser coil,蒸發(fā)式冷凝器,sump,pump,condenser coil,refrigerant vapor,subcooler,fan,liquid refrigerant,

3、cooling water,subcooled, liquid refrigerant,subcooler,水冷式冷凝器,hot, refrigerant vapor,29C,35C,冷卻塔,sprays,from condenser,to condenser,sump,propeller fan,outdoor air,29C,35C,fill,冷凝器控制,Condenser capacity is influenced by: Temperature difference between refrigerant and cooling media Flow rate of cooling

4、media through condenser Flow rate of refrigerant through condenser,pressure,enthalpy,full load condenser heat rejection capacity,part load,full load,Condenser Capacity,part load condenser heat rejection capacity,冷凝溫度控制,condenser water pump,flow-regulating valve,condenser,可變冷凝器水流量,cooling tower,conde

5、nser,variable-speed drive,condenser,cooling tower,bypass pipe,diverting valve,cooling tower,condenser,variable- speed drive,condenser,cooling tower,bypass pipe,diverting valve,可變進(jìn)水溫度,condenser,bypass pipe,cooling tower,冷卻塔旁通,diverting valve,4C,18C,13C,風(fēng)冷式冷凝器控制,heat rejection capacity,condenser airfl

6、ow,fan A,fan B,fan A,damper,A,B,冷凝器溢流控制,evaporator,compressor,liquid receiver,B,A,C,condenser,expansionvalve,discharge line,第三部分 蒸發(fā)器,制冷系統(tǒng)組成,Finned-Tube Evaporator,refrigerant vapor,liquid/vapor refrigerant,airflow,Turbulent Flow,Finned-Tube Evaporator,liquid/vapor refrigerant,refrigerant vapor,liqui

7、d distributor,airflow,suction header,Superheat,superheat,A,C,B,A,C,B,Shell-and-Tube Evaporator,refrigerant vapor,chilled water return,chilled water supply,tube bundle,baffles,liquid/vapor refrigerant,Shell-and-Tube Evaporator,baffles,Evaporator Control,Evaporator capacity is influenced by: Temperatu

8、re difference between refrigerant and air or water being cooled Flow rate of air or water through evaporator Flow rate of refrigerant through evaporator,Finned-Tube Evaporator Control,expansion valve,refrigerant vapor,evaporator,liquid refrigerant,Face-Split Arrangement,distributors,Face-Split Arran

9、gement,27C,-1.1C,13C,inactive coil,active coil,27C,Intertwined Arrangement,Row-Split Arrangement,Row-Split Arrangement,27C,13C,21C,Shell-and-Tube Evaporator Control,refrigerant vapor,liquid refrigerant,expansion valve,shell-and-tube evaporator,第四部分 膨脹裝置,制冷系統(tǒng)組成,膨脹裝置,expansion device,A,D,condenser,pre

10、ssure,enthalpy,evaporator,B,C,compressor,熱力膨脹閥,熱力膨脹閥 (TXV),液汽混合物,制冷劑氣體,蒸發(fā)器,A,液體制冷劑,TXV Control,liquid/vapor mixture,refrigerant vapor,A,liquid refrigerant,TXV Control,liquid/vapor mixture,liquid refrigerant,過熱,superheated vapor,TXV,2 MPa, 42.8C,0.59 MPa, 5C,A,liquid refrigerant,過熱,TXV,9.4C,0.54 MPa,

11、2 MPa, 42.8C,0.59 MPa, 5C,TXV Operation,external equalizer,remote bulb,evaporator,spring,suction line,distributor,diaphragm,TXV Operation,valve pin,suction line,spring,94C,0.54 MPa,0.67 MPa,0.54 MPa,0.13 MPa,valve diaphragm,TXV Operation,TXV,external equalizer,remote bulb,A,B,C,Superheat Setting,Too

12、 little superheat: Risk of damage to compressor by liquid refrigerant Too much superheat: Reduction of system efficiency Potential of coil frosting Risk of compressor damage due to overheating,第五部分 附件,制冷系統(tǒng)組成,電磁閥,電磁閥,finned-tube evaporator,solenoid valves,expansion valve,電磁閥,solenoid valve,expansion

13、valve,evaporator,liquid line,condenser,compressor,discharge line,suction line,液體管干燥過濾器,solenoid valve,expansion valve,liquid-line filter drier,evaporator,liquid line,液體管干燥過濾器,replaceable core type,sealed type,core,濕度指示視液鏡,sight glass,expansion valve,liquid line,吸氣管過濾器,suction line filter,compressor,

14、suction line,吸氣管過濾器,replaceable core type,sealed type,排氣消聲器,hot gas muffler,reciprocating compressor,discharge line,shell,perforated tube,截止閥,shutoff valve,shutoff valves,liquid line,condenser,compressor,shutoff valve,liquid-line filter drier,evaporator,檢修口,liquid line access port,suction line access ports,condenser,compressor,evaporator,第六部分 復(fù)習(xí),制冷系統(tǒng)組成,復(fù)習(xí)第一部分,expansion device,A,D,condenser,pressure,enthalpy,evaporator,B,C,compressor,復(fù)習(xí)第二部分,air-cooledcondenser,water-cooled condenser,evaporative condenser,復(fù)習(xí)第三部分,finned-tube