FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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 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.
Heat is transferred to a heat engine from a fumace at a rate of 120KW. If the rate of waste heat rejection to a nearby river is 50000W. Find the net Power output and the thermal efficiency for this heat engine.
.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.
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- I need the answer as soon as possiblearrow_forwardQ.7 The COP of the heat pump is found to be 5.62, and the heat pump operates with the source at 25°C, while the heat absorbed is 2.12 kW. What is the amount of heat rejected ?arrow_forwardPineapple fruits with a mass of 500 kg are supplied to a cold storage at 20 C. The cold storage is maintained at 5 C and the fruits get cooled to a storage temperature in 10 hours. The latent heat of freezing is 105 kJ/kg and the specific heat of fruit is 1.256 kJ/kg.K. Find the refrigeration capacity of the plant.arrow_forward
- A heat pump operates between temperature ranges of 100 C and 250 C. Find its COP. What will be its efficiency if the heat engine operates in the same temperature range?arrow_forwardDo fastarrow_forwardFind the COP of heat pump operating between 300 K and 600K temperature. If the same temperature ranges are used in heat engine, find the efficiency.arrow_forward
- A 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_forwardA 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.arrow_forwardcan you please solve this for me (the fraction of steam extracted from theturbine for the open feedwater heater)arrow_forward
- 2.3 A Carnot refrigerator operates with Refrigerant 134a as a refrigerant con- densing at 50°C and evaporating at –15°C. Find its COP using the Carnot expression as well as the properties of R134a. Also determine the power consumption per ton of refrigeration.arrow_forwardI need the answer quicklyarrow_forwardFind the COP of refrigerator working between temperatures 350 K and 1050 K. What will be efficiency of heat engine operating in same temperature range?arrow_forward
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