*14. ao Two pots are identical except that the flat bottom of one is alu-minum, whereas that of the other is copper. Water in these pots is boilingaway at 100.0 °C at the same rate. The temperature of the heating elementon which the aluminum bottom is sitting is 155.0 °C. Assume that heatenters the water only through the bottoms of the pots and find the temper-ature of the heating element on which the copper bottom rests.

Given data: The boiling temperature of water, TW = 100o The temperature of aluminum bottom, TAl =…

Answered: *14. ao Two pots are identical except…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.29P

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Similar questions

What is the relationship between pressure and the boiling point of liquids?
a) Liquid water in a tank can be converted into ice just by evacuating the air from the tank without using heat exchanger. Explain the process and how the device works and the process can be made more efficient. (b) If you have two pots with the same volume but different shapes, one is tall and narrow the other is wide and short, compare and explain about the boiling temperature of the two cases.Discuss the reason why the required temperature for the two cases are different or same on the basis of your answer
5. Calculate the latent heat of condensation for water at 8 MPa. Compare with values from steam table.
It has been found that condensation forms on the outside of the refrigerator when the temperature on the surface is T1 and lower certain parts during the year. If the temperature on the inside of the refrigerator is T2 , how thick insulation needed to avoid condensation? The cooling effect in the refrigerator is ?. The refrigerator wall is built (from the outside) with 1 mm metal (thermal conductivity is k1),mineral wool (thermal conductivity is k2)and an additional layer of 1 mm metal. T1 (°C)= 15 , T2(°C)=3 , ? (W)=70 , k1 (W/m·K)=15 , k2 (W/m·K)=0.04
What are the surface condensing systems? Explain their working.
Discuss the function of each part of this horizontal steam boiler.
What are the Contact condensing systems? Explain their working.
Which boiling mechanism is characterized by a drop in heat transfer with respect to the increase in temperature difference between the heated surface and the fluid? A. Pre-boiling B. Nucleate boiling C. Transition boiling D. Film boiling
A 2kW stainless-steel electrical kettle with capacity 2 liters is used to obtain steam from tap water. The ambient temperature of the water is 20°C, heat of vaporization of water is 2256 kJ/kg and specific heat coefficient of water is 4287 J/kg°C. Thermal resistance of the kettle is 0.1°C/W. a. How long it will the water to reach the boiling temperature? b. How long it will take to obtain 500 g steam?
O Falge QUESTION 2 The refrigerant undergoes a change of phase during the heat-transfer process, the pressure of the retrigerant is the saturation pressure during the low supply and low rejection processes. True False QUESTION 3 Frequently, the vapor of the liquid leaving the condenser is lower than the saturation temperature. O True False QUESTION & The pressure of the iquid leaveng the condenser we be less than the pressure of the vapor entarng, wd etempernd the retigerant in the condenser. O Te QUESTION S Are many situations in which it is desirable to combine three cycles in series, either power systems or refigertion sytems, to take advantage of a very wide temperature range or to utilize what would otherwise be waste heat to improve etficiency O true O False QUESTION 6 A cycle can't be made very efficient, since the temperature differences between the two fluid streams can be controlled through careful design of the combined system. True
Discuss the concept of real-time thermal monityoring system.
1. Water at atmospheric pressure is to be boiled in polished copper pan. The diameter of the pan is 300 mm and is kept at 111°C. Calculate the following : () Power of the burner to maintain boiling; (i) Rate of evaporation in kg/h. Take the properties of water at 100°C as follows: P, = 958 kg/m"; p, = 0.597 kg/m²; µ,= 278 × 10ʻ kg/ms; c= 4216 JkgK; = 2257 kJ/kg ; Pr= 1.723, o = 58.9 x 10-³ N/m %3D [Ans. (1) 13.664 kW, (i) 21.8 kg/h]

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