A refrigeration system operates on the reversed Carnot cycle. The minimum and maximum temperature are minus 30°C and plus 80°C respectively. If the heat rejected to the condenser is 4500 kJ/min find (a) Power input required in hp. (b) Tons of refrigeration developed (c) What is its EER? Draw the T-s diagram of the cycle labelling the respective absolute temperatures.

A refrigeration system operates on the reversed Carnot cycle. The minimum and maximum temperature are minus 30°C and plus 80°C respectively. If the heat rejected to the condenser is 4500 kJ/min find (a) Power input required in hp. (b) Tons of refrigeration developed (c) What is its EER? Draw the T-s diagram of the cycle labelling the respective absolute temperatures.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

See similar textbooks

Similar questions

Why is two-stage compression popular for extra-low-temperature refrigeration systems?
The condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14F
Two methods used to power refrigeration compressors on a ship are _____and ____.
When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.
Define net refrigeration effect as it applies to the refrigeration cycle.
If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7F, how much heat in Btu/h is being absorbed or rejected in the heat pump? Show all work and units.
A vapor compression refrigeration cycle operates at steady flow conditions with 0.25kg/s or R-134a. The table below shows some of the operating parameters andproperties for the refrigerant. The compressor is refrigerated, and the condenser is alsocooled with water. The compressor receives shaft power equivalent to 7.5 hp.Neglecting changes in kinetic and potential energy changes and any heat loss betweendevices, please answer the following.a. Complete the table below and sketch the cycle processes on a T-s diagram.When completing the table please use the same number of decimal places as inthe tables.b. Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigerationTon = 211 kJ/min).c. Compute the COP.d. Determine the volume flow rate of refrigerant entering the condenser in L/min.e. Determine the mass flow rate of cooling water passing through the condenser.f. Determine the heat transfer rate from the compressor.g. Compute the rate of entropy generation in the…
A vapor compression refrigeration cycle operates at steady flow conditions with 0.25kg/s or R-134a. The table below shows some of the operating parameters andproperties for the refrigerant. The compressor is refrigerated, and the condenser is alsocooled with water. The compressor receives shaft power equivalent to 7.5 hp.Neglecting changes in kinetic and potential energy changes and any heat loss betweendevices, please answer the following. I understand how to fill the values but I get lost after that, need some help.
A simple vapour compression refrigeration cycle using R-12 is designed for taking a load of 10 tonnes (1 ton of refrigeration is 3.5 kJ/s). The refrigerator and ambient temperatures are -0⁰C and 30⁰C respectively. A minimum temperature difference of 5⁰C is required in the evaporator and condenser for heat transfer. Determine: (a) the mass flow rate through the system (b) the power required in kW (c) the COP (d) the cylinder dimensions of the compressor assuming L/D = 1.2 for a single cylinder, single acting compressor if it runs at 300 rpm with volumetric efficiency of 90%.
An ideal refrigerant-134a vapor-compression refrigeration cycle operates between 0.14 MPa and 0.7 MPa. The mass flow rate of the refrigerant is 0.15 kg/s. Determine the coefficient of performance.
2. A refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 1170 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power = AnswerkW
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?