A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.29 kg/s and leaves at 26°C. The refrige Determine the theoretical maximum refrigeration load for the same power input to the compressor. The theoretical maximum refrigeration load for the same power input to the compressor is kW.

1. A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator temperature of -30°C and condenser exit temperature of 49 30 °C and requires 74.6 kW motor to drive the compressor. What is the capacity of the refrigerator in tons of refrigeration? Enthalpy at condenser entrance = 382 kJ/kg, exit = 248.15 kJ/kg, at evaporator entrance 248.15 KJ/kg, exit = 338.14 kJ/kg.

Consider a refrigrator that operates on the vapor compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 100 kPa, and exits at 1000 kPa and 80°C, and leaves the condenser as saturated liquid at 1000 kPa. The coefficient of performance of this refrigrator is Lütfen birini seçin: a. 1.21 b. 1.87 c. 2.85 d. 1.59 e. 2.34

A real heat pump has .02 kg/s of refrigerant R-134a flowing through it and it consumes 3kW of power. The refrigerant is a mixture at 50% quality and 120 kPa entering the evaporator and leaves at 100 kPa and -20 C. The refrigerant enters the condenser at 1.4 MPa and leaves at 1.2 MPa . Assuming no loss in pressure or temperature in the connecting pipes, determine the Temperature, Pressure, Enthalpy and Entropy at all positions in the cycle, the heat transfer coming in and leaving , the COP of this heat pump, the Isentropic Efficiency of the compressor and the rate of Entropy Generation in the compressor and of the Throttling process. This is a Thermodynamics question The refrigerant in this problem is         R-134a

mr-pant quest an ar IS SU you part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.35 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. The compressor consumes 3.3 kW of power. Use data from the tables. 26°C 1.2 MPa 5°C subcooled Expansion valve Condenser Evaporator OL Water 18°C 1.2 MPa 50°C Compressor Determine the COP of the refrigerator. The COP of the refrigerator is (You must provide an answer before moving to the next part.)

A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator temperature of -30 C and a condenser exit temperature of 49.30C and requires 74.6 kW motor to drive the compressor. What is the capacity of the refrigerator in tons of refrigeration? Enthalpy at the condenser ,entrance = 382KJ/Kg, exit = 248.15KJ/Kg, at evaporator entrance= 248.15kJ/kg, exit =338.14kJ/kg.

In a cascade refrigeration system,the compressor power in the low and high pressure loop are 13 kw and 10 kw, respectively.Find the mass flow rate of cooling water in the condenser for a temp increase of 19°℃, if COP is 5.

An ideal refrigeration cycle that has a condenser temperature of 45°C and an evaporator temperature of -15°C. Determine the COP of this refrigerator for the working fluid R-134a.

A refrigeration system using R-12 receives a load of 54 KW at an evaporator temperature  of  - 4 oC  and a condenser temperature of 42 oC.Determine:a. Calculate the power required by the compressor in KW.       b. If a liquid to suction heat exchanger is to be installed henceforth superheating the vapor refrigerant by 10 oC upon entering the compressor, what is the COP?

Condenser a steam power plant that operates on a simple ideal ranking cycle and has a net power output of 22MW. Steam enters the turbine at 7Mpa and 450.05°C and is cooled in the condenser at a pressure of 10kpa by running cooling water from a lake through the tubes of the condenser at rate of 1750 kg/s. Determine the mess flow rates of steam through the steam turbine assuming that the cp of superheated steam is 2.9593kJ/kg.K.