A passive solar house that is losing heat to the outdoors at an average rate of 50,000 kJ/h is maintained at 22°C at all times during a winter night for 10 h. The house is to be heated by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A thermostat-controlled 15-kW backup electric resistance heater turns on whenever necessary to keep the house at 22°C. How long did the electric heating system run that night?

Q: Two rigid tanks are connected by a valve. The left tank is filled with 8.6 ft of air initially at 22…

A: Given Pressure, PA = 22 psia               PB = 17.3 psia Volume, VA = 8.6 ft3               VB =…

Q: 3. A refrigerator with a power of 450W and a COP of 1.5 is used to cool 5 watermelons of 11kg each…

A: GivenP=450WCOP=1.5n=5m=11kgT2=8oCT1=28oCCp=4.2 kJ/kgoC

Q: A heat pump is used to maintain a house at T,°C_by House extracting heat from the outside air on a…

A:

Q: heat engine receives heat from a heat source at 1200°C and has a thermal efficency of 40 percent.…

A: For solution refer below images.

Q: expends 169.55 kJ of energy while pressurizing 7.683 kg of water initially at 11.25°C. The…

A: Image_1

Q: (2) A well-insulated 106 m³ room initially at 3°C and 88 kPa is heated by the radiator of a steam…

A: Given that, Volume of isulated room, v=106 m3Initial temperature, T1=3 °C,Initial Pressure, P1=88…

Q: The power required to drive the compressor in a Carnot refrigerator is 55 hp. It operates between…

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Q: pom has a 250 W re c resistance heater. iCe it is observed t

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Q: A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C.…

A: Given data, Process 1-2 :- According to the question, a pin fixed the piston at a point. Now, the…

Q: Consider the heating of water in a pan on a top of a range. If 24 kJ of heat is transferred to the…

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Q: A Carnot refrigerator consumes 2 kW of power while operating in a 20°C room. If the food compartment…

A:

Q: A 4-m x 5-m x 6-m room is to be heated by a baseboard resistance heater. It is desired that the…

A:

Q: A 20-kW electric heater is used to heat up a house with size measured 6 m x 8 m x 10 m. The house is…

A: The mode of heat transfer in which molecules from a hot surface moves to a cold surface due to…

Q: A device expends 172.31 kJ of energy while pressurizing 8.812 kg of water initially at 11.44°C. The…

A:

Q: A device expends 164.78 kJ of energy while pressurizing 7.737 kg of water initially at 11.65°C. The…

A:

Q: Three hundred kilojoules of heat is added in a piston cylinder arrangement containing air causing it…

A: Polytropic heat addition and work done relation is used.

Q: Heat flows through a wall of a house at a steady-state on a day when the temperature of the outdoor…

A: GivenTo=2oC=2+273=275KTi=27oC=27+273=300K

Q: A household refrigerator that has a power input of 450 W and a COP of 1.75 is to cool five large…

A: To Find: The time taken for the refrigerator to cool the watermelons. Calculation. The power input…

Q: A single-acting air compressor is required to compress 0.66 m³ of air from 1.3 bar to 9.5bar at…

A: Given, V1 = 0.66 m3 P1 = 1.3 bar = 1.3 x 105 N/m2 P2 = 9.5 bar = 9.5 x 105 N/m2 T1 = 28 C = 301 K n…

Q: Icecream container is to be keep in an existing state at 233.15 K in a hot weather where the…

A: To Find : The minimum power in watts required for this machine. Given : The lower temperature is…

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: A rigid container with 6 m × 9 m × 3 m can be considered a closed system in which the container's…

A: Given: Volume of the container= 6×9×3=162m2 Initial pressure P1=110kPa Inital temperature=32°C or…

Q: A

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Q: on water-cooled air-conditioning system with a condensing temperature of 45°C and evaporating…

A: we require the enthalpy at the entrance of the compressor

Q: Consider steady heat transfer through a 5-m 6-m brick wall of a house of thickness 30 cm. On a day…

A:

Q: A device expends 170.14 kJ of energy while pressurizing 4.797 kg of water initially at 10.52°C. The…

A:

Q: device expends 142.26 kJ of energy while pressurizing 3.93 kg of water initially at 12.88°C. The…

A: Given:Q=142.26 KJm=3.93 KgT1=12.88°Cη=59.73%

Q: A furnace can supply heat steadily at 1300 K at a rate of 200 kJ/s. The maximum amount of power that…

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Q: A refrigerator operating between -5°C and 27°C has the capacity of 80 tons. Determine the number of…

A: Write the given data in the problem.  m=10 kgT1=27°CT2=0°C Here, m is the mass of the refrigerator,…

Q: A car engine with a power output of 64 hp has a thermal efficiency of 24%. Determine the fuel…

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Q: A device expends 152.03 kJ of energy while pressurizing 6.953 kg of water initially at 11.81°C. The…

A: Given data:-  Work expended(w) = 152.03 kJ                   Mass(m) = 6.953 kg…

Q: Sensible heat transfer from a warm body to a cold body is only possible when

A: Sensible heat: The heat that is required to increase unit temperature of unit mass of any object is…

Q: Two identical metal blocks L and M (specific heat3D0.4 kJ/kg K). each having a mass of 5 kg, are…

A: Given:m=5 kgC=0.4 kJ/kg.KTL=TM=313 KTLf=293 K

Q: A device expends 164.65 kJ of energy while pressurizing 8.391 kg of water initially at 17.68°C. The…

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Q: A household refrigerator that has a power input of 450 W and a COP of 1.55 is to cool five large…

A:

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.