The drinking water needs of an office are met by cooling tap water in a refrigerated water fountain from 23 to 6°C at an average rate of 18 kg/h. If the COP of this refrigerator is 3.1, the required power input to this refrigerator is (a) 1100 W (b) 355 W (c) 195 W (d) 115 W (e) 35 W

Q: A refrigerator used to cool a computer requires 1.2 kW of electrical power and has a COP of 1.8.…

A: Electrical power input = Power required to run compressor = Work input = 1.2 kW COP of the…

Q: Prove that a refrigerator’s COP cannot exceed that of a completely reversible refrigerator that…

A: Two refrigerators of reversible and irreversible are shown in below figure Assume coefficient of…

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A:

Q: A heat engine is operating on a Carnot cycle and has a thermal efficiency of 55 percent. The waste…

A: Given data  the thermal efficiency of Carnot cycle (η) = 55% or 0.55 heat rejected (Q˙r) = 800…

Q: A heat engine receives heat from a source at 1100 K at a rate of 400 kJ/s, and it rejects the waste…

A: Given data: The temperature of the source is TH=1100 K. The heat from the source is QH=400 kJ/s=400…

Q: Calculate and plot the COP of a completely reversible refrigerator as a function of the temperature…

A: Given data Temperature of source TH = 500K Temperature of sink TS = 250K To determine coffecient of…

Q: Consider a heat engine operating between a high thermal reservoir at 500oC  and a low thermal…

A: GivenT1=500oC=773KT2=10oC=283KW=325kWQr=200kW

Q: Does a refrigerator that has a higher COP necessarily have a higher second-law efficiency than one…

A: Let's first understand the coefficient of performance (COP) of a refrigerator:The coefficient of…

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A: Given data

Q: An inventor claims to have developed a heat engine that receives 700 kJ of heat from a source at 500…

A: The maximum efficiency of an engine is the Carnot efficiency. And it is a function of the…

Q: Consider the heat engine shown below, operated in contact with a cold thermal reservoir at…

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Q: Bananas are to be cooled from 20°Cto 4.6°C at a rate of 1555 kg/h by refrigerator that operates on a…

A: Given:- mc=1555 kg/hc=3.35 kJ/Kg°CT1=20°CT2=4.6°CW=2.5kWTo find:COP

Q: A 600-MW steam power plant, which is cooled by a nearby river, has a thermal efficiency of 40…

A: Given  The power output of steam power plant = 600 MW  ηt = 40 percent    To determine  Amount of…

Q: Real heat engines, like the gasoline engine in a car, always have some friction between their moving…

A: A heat engine is a device that converts thermal energy into mechanical energy. There are two types…

Q: . A geothermal-based trigeneration plant produces 2.5 MW of electricity, 1.8 MW of process heat, and…

A: To determine the utilisation factor for the given geothermal plant.

Q: Consider mixing some of the ice water with the hot water and vice versa so that the two reservoirs…

A: Mixing of cold water with hyot water & vice versa is an irreversibleprocess .ii) The mixing…

Q: Determine the expressions for the thermal efficiencies and coefficients of performance for…

A:

Q: A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when…

A: Write the given data.

Q: A refrigerator used for cooling food in a grocery store is to produce a 25,000 kJ/h cooling effect,…

A:

Q: (a) What is the hot reservoir temperature of a Carnot engine that has an efficiency of 42.0% and a…

A:

Q: A household refrigerator that has a power input of 500 watts and a COP of 2 is to cool eight large…

A: The COP of a refrigerator can be calculated using the formula given below as- COP=Q2Win where, COP…

Q: Prove that the COP of all completely reversible refrigerators must be the same when the reservoir…

A: Draw the diagram of both the refrigerator.

Q: A food department is kept at 212°C by a refrigerator in an environment at 30°C. The total heat gain…

A:

Q: 8.) The structure of a house is such that it loses heat at a rate of 7500 kJ/h per °C difference…

A:

Q: A Carnot heat engine receives heat from a reservoir at 1200°C at a rate of 800 kJ/min and rejects…

A:

Q: A

A:

Q: A house loses heat at a rate of 5400 kJ/h per °C difference between the indoors and outdoors. If a…

A: Given data:-Rate of heat loss, qr=5400kJ/h-°CLet Lower temperature be THiger temperature,…

Q: An inventor claims to have invented a heat engine that has thermal efficiency of 85% when operating…

A:

Q: Does a heat engine that has a thermal efficiency of 100 percent necessarily violate the first law.

A: The 1st law of thermodynamics states the conversion of one form of energy to another completely.…

Q: What is a second law efficiency? How does it differ from a first law efficiency?

A: As per the guidelines, 1st question is answered.

Q: During an experiment conducted in a room at 25°C, a laboratory assistant measures that a…

A: Basics of Carnot COP for refrigerator are used.

Q: What is cyclic Heat engine? What is the difference between refrigerator and heat Pump?

A:

Q: Explain the principle of refrigerator? Show that a reversible heat engine acts as a refrigerator.

A: Principle of refrigeration: Refrigeration is the cooling of a system below the temperature of its…

Q: What is the highest possible theoretical efficiency of a heat engine operating with a hot reservoir…

A: Given:- T1=2000°C T2=10°C To find:- The theoretical efficiency of heat engine

Q: How does a geothermal power plant generate electricity? Explain on the basis of heat transfer and…

A: Given: Explain a geothermal power plant on the basis of energy transformation to generate…

Q: A heat pump is to be used to heat a house during the winter. The house is to be maintained at )21°C(…

A: Given Data The outside temperature is , TH=21°C Heat losing rate 135MJ/h Outside temperature drops,…

Q: thermal power plant over temperature range of 400 - 750 degree celcius

A: GIVEN: T1=750CT2=400C

Q: Determine the maximum possible thermal efficiency of the power plant, and the maximum power output

A: Given : TH=80°C=80+273=353°K            TL=30°C=30+273=303°K           Qs=1 KJ/s

Q: A Carnot heat engine receives heat at 900 K and rejects the waste heat to the environment at 300 K.…

A: Given Data: The input temperature of the Carnot engine is: T1=900 K. The input temperature of the…

Q: Determine the minimum work per unit of heat transfer from the source reservoir that is required to…

A: To find  The minimum work required to drive a heat pump W. Given  The temperature of the sinkTh is…

Q: A refrigerant unit used in an air conditioning unit using R-134a as a refrigerant is mounted in the…

A: Assuming ideal vapour compression refrigeration system Qd = 1.5KW T1 = 15°C, evaporator section T2 =…

Q: 25. A refrigerator is removing heat from a cold medium at 3°C at a rate of 7200 kJ/h and rejecting…

A: Given Data Qc=7200 kJ/h=2 kW COP=2

Q: What is the highest possible theoretical efficiency of a heat engine operating with a hot reservoir…

A: Given Data: The temperature of hot reservoir furnace is, T1=2000°C=2000+273 K=2273 K. The…