In this video we take a look at how to design and analyse a HVAC refrigeration. The same method can be applied to a refrigeration, AC or chiller system. We take a look at the properties of refrigerant around the ideal vapour compression cycle. We look at the entropy, enthalpy, pressure and temperature. P1 P2 P3 P4 T1 T2 T3 T4 H1 H2 H3 H4 S1 S2 S3 S4.

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40 thoughts on “How to DESIGN and ANALYSE a refrigeration system

  1. Sam says:

    This might be not so smart question, but may I know what chemical modelling is usually used for the saturation table? What I mean, is it Peng-Robinson, or etc.?

  2. 3D Printwiz says:

    Just wanted to ask, I am using a different table and chart that comes from a book, which has quite different values than yours. When I read the preface, it says the tables and chart are based on a 0 *C where values of hf = 200 kj/kg and Sf = 1 kj/kg K. Is there a correction that I should do to get the same values that you get if I use my book. Thank you.

  3. Artur Zych says:

    Question: How do you know the pressure required for the low and high side? Is it just the pressures the compressor can generate and need for the suction side?
    Also, if that's given or you find out, how do you know the mass needed in your system just use the ideal gas law at that point?

    Anyone can answer, I'm just curious

  4. Václav Zajíček says:

    Thank you for this video. May i ask you? How is possible to calculate dimension (ID and lenght) of capillary tube? ..when I use very stron vent on condenser, how can I calculate its effect on the system?

  5. Babur Yakar says:

    Thank you for this useful video, I thoroughly enjoyed watching it. There is a one thing though: on the evaporator load: it's written as m*(h1-h4) but calculated as m*(h1-h3). I presume is the latter. Am I correct?

  6. Max Dax says:

    I want to build a deep freezer from scratch, what kind of expansion valve do I need using your calculation? Like what should I look for in data charts of expansion valve after doing calculations?

  7. u2ooberboober says:

    Amazing! I wish to make a static evaporator for a room to produce freezing temps without air movement. How could I use this info to design the custom evaporator while utilizing a premanufactured condensing unit amd known refrigerant?

  8. kamal gautam says:

    If we have a cooling load then how do we start the design of the Refrigerator? Also, how to fix the evaporator pressure if we are designing a system to cool at around -70 to -80 degrees celcius?

    Thank You!!

  9. Ghostrider GR says:

    i have one dryer air..
    works 3 to 40 c temp
    i change filter and capillary tube but i haft to resize it…
    so now i have
    -7.5c entry to evaporator and exit 2.5c
    after to the accumulator i have – 3.5 and entry to compressor 9c is that normal…. how much must be the Δτ to the evaporator? and with the temp room so the dryer ro works good??
    thanks

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