4-67 A 4-m x 5-m x 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 5 to 25°C within 17 min. Assuming no heat losses from the room and an atmospheric pressure of 100 kPa, determine the required power of the resistance heater. Assume constant specific heats at room temperature. Answer: 2.12 kW

Q: Gas at 70 bars gage pressure and 37.8°C is contained in a 12,900-cm3 cylinder. A piston compresses…

A: The gas gage pressure is = 70 barAtmospheric pressure is = 1.01325 barThe temperature is T1=37.8…

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: 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: A 10 kg Iron Box is holding 48 kg of solid ice. Initially, both the box and the ice are at -35 C.…

A:

Q: a piston cylinder containing air receives heat at a constant temperature of 500k and an initial…

A:

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: Question 1: 4-20 A piston-cylinder device contains 0.15 kg of air initially at 2 MPa and 350°C. The…

A:

Q: 6-80E A thermodynamicist claims to have developed a heat engine with 50 percent thermal efficiency…

A: Yes, this claim is valid. Explanation:

Q: a) A basement refrigerator is used to store cool beverages during the long hot summer. The…

A: following is the answer to the above problem-

Q: 53.4 lbm of air in a rigid container at 22 psia and 400 R absorbs 3.04127 kW*hr of energy from an…

A:

Q: Thermodynamicclass  contains  32  undergrad  students.  The  plan  is  to   air-conditionthe…

A: Given data: Total number of students = 32 Cooling capacity of air-conditioning unit = 8 kW Heat…

Q: o a low-temperature sink at

A: given:Q2=315kWT2=12+273=285KQ1=657kW

Q: The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance.…

A: Introduction In this problem, we will use the ideal gas equation for each state to compute the…

Q: In a system undergoing adiabatic expansion, what are the values of internal energy and heat if work…

A: Given data:

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.