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    niceguy514's Avatar
    niceguy514 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 21, 2007, 10:31 AM
    Heat exchanging system, Pressure ?
    I am making a heat exchanger as a project so I am going to ask a whole bunch of questions at once.

    The system will consist of a pump, evaporator and condenser. The cold side will have a temperature of anything below 0 C and the high side will have anything higher then 2 C.

    I want to use R134 which evaporates at -26 C at 101kPa.

    If I vacuumed the system, the pressure should correlate with the Temperature. But now since I have 2 temperatures, what would the saturation temperature be. I got stuck here because I would not be able to calculate the heat transfer coefficient.

    If I were to pressurize the system to 293kpa, which will mean a saturation temperature of 0. If the temperature reaches 20 C. Does this mean that it would be Psat + Initial Pressure.

    Last question but not the least :) .

    Will this system always be at film boiling and film condensation?
    rahul_chaubey's Avatar
    rahul_chaubey Posts: 13, Reputation: 0
    New Member
    		  
    #2

    May 2, 2007, 08:17 AM
    Hi
    This s rahul
    I thnk I could be able to answer your quistion
    But your question is not clear
    If u want to design heat exchanger, you need to take various parameters into consideration
    1. no of tubes
    2 thermal conductivity of material being used
    3 Tonnage of compressor
    Reagrds
    Rahul
    awnshaikh's Avatar
    awnshaikh Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Jul 16, 2007, 05:37 AM
    Dear Niceguy514

    Could you clarify that you want to design heat exchanger or the whole system?
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