Results 1 to 4 of 4
  1. #1
    Join Date
    Sep 2005
    Location
    India
    Age
    49
    Posts
    30
    Rep Power
    0

    Question Air Source Heat Pump - temp of refrigerant leaving evaporator



    Hi Technocrats,
    I am trying to design air source heat pump for water heating application. Though I have an experience in selling heat pump, but not designed nor have information.
    Cosider the example:
    Refrigerant-R22
    Evaporating temp - 4 deg. C. (39.2 F)
    Ambient air temp (flowing through evaporator) - 30 deg. C (86 F)
    Temp drop across evaporator - 7 deg. C. (44.6 F)
    My query:
    1. How to design evaporator?
    2. How to calculate heat content in refrigerant gas at evaporator outlet?
    3. How to calculate, refrigerant gas temp leaving evaporator?



  2. #2
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    72
    Posts
    4,266
    Rep Power
    46

    Re: Air Source Heat Pump - temp of refrigerant leaving evaporator

    Hi anup,

    I am not a designer but a welded plate HE is the best for your application.

    You will need to provide more details if you want some free advice, like, information on the water side.

    Chemi

  3. #3
    Join Date
    Sep 2005
    Location
    India
    Age
    49
    Posts
    30
    Rep Power
    0

    Re: Air Source Heat Pump - temp of refrigerant leaving evaporator

    Dear Chemi,
    Thanks for your reply. I was coming to that point but at a later stage.
    Water part will come while designing condensor. but before that I need to understand evaporator design, based on which I can give you heat content in discharge gas (from compressor).
    Meanwhile, could you pl. give some basic guidelines for condensor?
    Anup

  4. #4
    Join Date
    Nov 2006
    Location
    Australia
    Age
    59
    Posts
    14
    Rep Power
    0

    Re: Air Source Heat Pump - temp of refrigerant leaving evaporator

    hi Anup,
    How many litres of water are you heating? will the water be in a insulated storage tank? how many kiloWatts compressor capacity do you require to heat the water, what is your cut in / cut out water temperature degrees C? The problem you may find is that up to a certain water temperature, Eg. up to 40 degrees C condensing the refrigerant is not a problem, after that the condensor may become just a subcooler and therefore the eficiciency or COP of your system will fall very quickly.

Similar Threads

  1. dual source heat pump
    By Lc_shi in forum New Technologies
    Replies: 29
    Last Post: 12-08-2010, 02:24 AM
  2. frostles heat pump
    By Lc_shi in forum New Technologies
    Replies: 27
    Last Post: 31-03-2008, 07:53 AM
  3. Ground source heat pump
    By Cooler in forum Domestic
    Replies: 1
    Last Post: 29-07-2006, 08:51 PM
  4. Evaporator Design-Air Source Heat Pump for water heating
    By anup in forum Technical Discussions
    Replies: 7
    Last Post: 20-03-2006, 03:26 PM
  5. Mcquay water source heat pump
    By bernie in forum Air Conditioning
    Replies: 2
    Last Post: 10-02-2003, 02:53 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •