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19-03-2014, 11:41 AM #1
Determining the efficiency of an Upright Cabinet Evap Coil
We are currently doing a number of test and thought I would throw out for some advise and opinions.
1) What is an Ideal TD for an 12ft Upright Cabinet to ensure it is efficient.
2) Best Place to measure from - Ie. After EV, Mid Coil and After Coil
3) Believing Mid Coil should be closet to zero
4) We using Hot Gas Defrost so we don't use a heater
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23-03-2014, 11:53 AM #2
Re: Determining the efficiency of an Upright Cabinet Evap Coil
There are a lot of details that you need to provide to answer the first question.
Assuming you are meaning designing a cabinet and not trying to optimise a current design's performance can you advise
- what is the temp you want to achieve?
- what stock will be stored in it or is it just for general use?
- is cabinet RH% important in the application?
The larger the coil surface the smaller the TD can be and therefore you can run a higher SST to achieve the temp which = better efficiency. A balance of capital outlay, ongoing energy consumption and RH to provide a general storage condition would see a 5K to 6K TD used as a design.
To truly work out capacity I would be using a flow meter in the liquid line and use the coil SST and suction line as it leaves the refrigerated space to take enthalpy measurements from.
I am not sure what you mean by point 3, are you referring to LMTD?...and she said "give it to me you big fridgie"