FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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/Heat is transferred from a tank of water in a refrigerator at(OC)
degrees to a tank of boiling water at (100 C) degrees. With a reversible
machine (heat pump). Calculate the Heat drawn from the refrigerator. if it
was The heat transferred to the tank of boiling water is 2254kJ.
A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.
A refrigeration system has a heat added of 440 kw. If COP is 7,find the mass of cooling water in the condenser for a temperature increase of 14°C.
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- Find COP of a reversible heat pump operating between temperatures 20 and 200 °carrow_forwardA refrigeration system is used to cool water in the evaporator at 5 kg/s of water from 30 °C to ice. Find the tons of refrigeration required.arrow_forwardThe following data refers to an air conditioning system to be designed for an industrial process for hot and wet climate. Outside conditions = 38o C DBT and 74 % RH. Required conditions are 23o C DBT and 65 % RH. This is achieved by cooling and dehumidifying and then by heating. If 42 m 3 of air is absorbed by the plant every minute, find the capacity of cooling coil in TR, capacity of heating coil in kW and amount of water removed per hourarrow_forward
- A refrigeration system has a heat rejected of 430 kw.If COP is 7,find the mass chilled water in the evaporator for a temperature decrease of 16°℃.arrow_forwardFind the required work to transfer 1200j of heat from the sink(cold body)-90°c source (hot body)at 35°c in the case of refrigeratorarrow_forwardIn a cascade refrigeration system,the compressor power in the low and high pressure loop are 12 kw and 13 kw,respectively.Find the tons of refrigeration if COP is 5.arrow_forward
- Find out the COP of a Carnot heat pump operating between 6°C and 37°C.arrow_forwardAsaparrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 28 kW. The actual C.O.P. of the refrigeration plant used is one fourth that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward
- 3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 30 kw. The actual C.O.P. of the refrigeration plant used is one third that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forwardThe evaporator of a refrigeration system is to be maintained at-12°C.If degree superheat is 7℃, find the temperature of refrigerant entering the compressor.arrow_forwardA heat engine of 30% efficiency drives a heat pump of COP 5. The heat is transferred both from engine and the heat pump to circulating water for heating the building in winter. Find the ratio of heat transfer to the circulating water from heat pump to the heat transfer to the circulating water from the heatarrow_forward
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