19
Jul
Thermal Efficiency Of Refrigeration Cycle. From an economic point of view the best refrigeration cycle is one that removes the greatest amount of heat from the inside of the refrigerator cold reservoir for the least expenditure of mechanical work or electric energy. The refrigerating capacityQ o and the required powerPare calculated from the mass ow of the refrigerant mR Q o m R qo. It is a lower case h in the Symbol font if you ever need to type it. The coefficient of performance is used to quantify the performance of refrigeration cycles.
The efficiency of the Stirling cycle is the same as that of the Carnot cycle. The refrigerant leaves the evaporator at -20oC and has a condenser pressure of 09 MPa. Therefore the waste heat can be utilized by the thermoelectric device to generate electrical power which can be used as a supplement to the compressor of the refrigeration cycle. Find COPR and COPR Carnot for the same Tmax and Tmin and the tons of refrigeration. It is a lower case h in the Symbol font if you ever need to type it. The thermal efficiency in terms of the compressor pressure ratio PR p 2 p 1 which is the parameter commonly used.
The coefficient of performance of a refrigeration cycle may be increased by using thermoelectric generator in a proper arrangement.
The coefcientCOPNUC depends only on the tempera-. Hence new thermal efficiency after solving equation 1 η 1 T 3 T 1 Which is equal to Carnot Cycle efficiency. R11 R12 CCl 2F 2 dichlorodifluoromethane - used for refrigeration systems at higher temperature levels - typically water chillers and air conditioning R22 CHClF. Just like the efficiency of power cycles the COP is defined as the ratio of the desired output to the required input. The coefcientCOPNUC depends only on the tempera-. Find COPR and COPR Carnot for the same Tmax and Tmin and the tons of refrigeration.