I wonder if one has a table of quantities of refrigerants by weight for charging house hold refrigerators ranging between 10 - 20 cubic feet capacity. Is the charge the same if different refrigerants are used?
Apparently when the refrigerant changes its specific weight and density would also change as if I need 0.8 kg of R134a for a standard size household refrigerator and if switched to R 22 which is much denser than R134a will need less than 0.8 kg of refrigerant. hope this clears the idea.
Thank you M Salman
I am specifically asking about R134a charge for each household refrigerator of different sizes say,10,12,14,16,20 cubic feet. How much each one needs of this refrigerant (R134a)?
Dear College,
You ask for a table of refrigerant charge for different sizes of refrigerators. I think the charge is dependent on the size of the condenser, evaporator, ..etc which are variable in size from manufacture to another, so that, such table may be hard to be found, but you can use a general method of charging. This method depends on some signs which reflect the normal operation of the refrigerator such as the amount of frost in the freezer and the electrical current drawn. You can start charging and notice if the suction line start to frost, then stop and purge a small amount of Ref. to defrost the line. The refrigerator should work in the normal ambient temp. during charging. By the way, R22 is never used alone with domestic refrigerator.
Yes, we can find out the optimum charge mass of refrigerant in a domestic refrigerator/freezer and air conditioner to achieve optimal energy efficiency and/or capacity at a certain ambient condition range for a specific unit. The charge amount is decided by the refrigerant vapor and liquid ratio in components and the internal volumes of each components including the evaporator and condenser coils, filter internal void, liquid pipe volume, and compressor lubricant oil type. Proper charging is key to a product running safety and performance.
We have e-Tools to help estimate the optimal charge quantity of a CAP tube, TEX, or EEV refrigeration/AC unit available at the website www.refriglab.com. Both smart phones and laptop/desktop computers can work friendly with the website.
For unit services, it is always right and necessary o check the product brand plate/manual to get the proper charge amount. Remember that overcharge may damage your compressor, and undercharge will decrease the output of the unit.
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