Two large black plates are separated by a vacuum. On the outside of one plate is a convection environment of 80C with h=100W/m2C, while outside the other plate is exposed to 20C and h=15W/m2C. Make an energy balance for this system and determine the plate temperatures.

Q: Consider a person whose exposed surface area is 1.7 m², emissivity is 0.7, and surface temperature…

A: (a) Write the given data. A=1.7 m2ε=0.7Ts=32 °C=305 KTw=300 K

Q: An iron block cools down from 200°C to the room temperature of 27°C, when outdoor is 5°C, heating…

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Q: turbine with a pressure = 4,835 kPa and h = 3,209.47 kJ/kg, with a flow of 6.494 kg/s. Steam leaves…

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Q: Consider a TV set that consumes 120 W of electric power when it is on and is kept on for an average…

A: Given: The average time per day TV is kept on is t=6 h The power consumes by the TV is P=120 W The…

Q: A person stands in front of a fire at 650 C in a room where air is at 5°C. Assuming the body…

A: Given data T = 650° C  Temperature of air = 5°C Body temperature = 37°C Coefficient of conduction =…

Q: A solar collector meets the hot water needs of a family for 7 months, excluding 5 months of the…

A: Period of time in which hot water is needed = 7 months Average temperature of hot water = 55°C…

Q: How is temperature and pressure rise in the vapor absorption system?

A: Vapor absorption refrigeration system an absorption is a refrigerator that uses a heat source to…

Q: A 1.5m-long, 0.45-cm-diameter electrical wire extends across a room at 61°F, as shown. Heat is…

A: Given data: T1=61°F=16.22°CT2=306°F=152.22°Cd=0.45 cm=0.0045 mL=1.5 mV=70 VI=1.73 A Need to…

Q: Three hundred sixty kilojoules of heat is transferred from a hot source of T = 600 K to a cold sink…

A: GivenQ1=360kJTh=600KTc=250KTsurr=300K

Q: A radiant heating lamp has a surface temperature of 800 K with ε = 0.6 How large a surface area is…

A: Data given-  T = 800 K  ε = 0.6  Q = 350 W

Q: An object of mass 2.0 kg has a velocity of (i -4 + j3 ) m/s. A force acts upon it and does 28 Nm of…

A:

Q: Work done in a free expansion process is (a) +ve (b) -ve (c) zero (d) none of the above

A: Free expansion is the process in which gas expands without any resistance or pressure from the…

Q: Does any of the energy of the sun reach the earth by conduction or convection?

A: Since there is no atmosphere in space between the Sun and the earth, the significant portion of the…

Q: A student living in a 3-m X 4-m X 4-m dormitory room turns on her 100-W fan before she leaves the…

A: Using the properties of air  R=287 J/Kg-K Cp=1.005 KJ/Kg-K Cv=0.717 kj/Kg-K Heat transfer, Q=100W…

Q: A body at temperature 39ºC is kept in a surrounding of constant temperature 20ºC. It is observed…

A: GivenTbody=39°CTsurr=20°C

Q: A 20lbm object is located 300 ft above the ground. What is the potential energy of the object in…

A: Potential energy is product of Mass, acceleration due to gravity and height. PE = 1944.986 cal (In…

Q: explain why summer is warmer than winter. Specifically, how can summer be warmer than winter if…

A: Two factors make it warmer in the summer: (1) the Sun is higher in the sky, which means more direct…

Q: Consider a person whose exposed surface area is 1.5 m2, emissivity is 0.5, and surface temperature…

A:

Q: Determine the heat interaction when a gas does 12 kJ of work which cause the internal energy to…

A: GivenW=12 kJE=30 kJAskedq=?SolutionE=q+W

Q: The roof of a building is well insulated on its lower surface and the upper surface is made of black…

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Q: A thermocouple used to measure the temperature of hot air flowing in a duct whose walls are…

A: Given data: Tw=500 KTth=850 Kε=0.6h=60 W/m.°C Need to determine the actual temperature of air.

Q: Liquid A has a density of 0.85 kg/m3 and a specific sensible heat capacitance (Cv) of 2.2 kJ/kgK.…

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Q: A body whose surface area is 0.65 m2 and the temperature is 175ºC is placed in a large chamber whose…

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Q: pressure = 4,835 kPa and h = 3,260.71 kJ/kg,

A: Handwriting.jpg

Q: A flat-plate collector gets incident of solar radiation at a rate of 260 Btu/h-ft' and has the…

A: Incident Radiation, G = 260 BTuh*ft2 Collector temperature, Tc = 120 F ambient air temperature, Ta =…

Q: Determine the work interaction when a gas absorbs 12 kJ of heat without a change in its absolute…

A:

Q: A 12-by-12 in. open pan containing water at 140 °F is placed in the exact center of a 16-by-20 ft…

A: Given - A=12×12 in2=0.093m2 , T1=140°F=333.15K, T2=75°F=297.04K The shape factor will be 0.5 as pan…

Q: What are the three methods of Heat Transfer? Explain each.

A: Explanation: The three methods of Heat Transfer - Conduction: It is a mode of heat transfer between…

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.