01 January 1970 3 7K Report

It's vital to optimise the refrigerant charge for refrigeration and air-conditioning units. The attached are charging curves of a typical air cooler R290 unit with 5mm OD tube air coils based on modelling with RefrigLab cloud eTools (www.refriglab.com):

Fig(a): Both COP and cooling capacity are maximised with R290 charge of 140-148g. Refrigerant R290 entering into TEV is subcooled (SC>0, quality Xinlet=0, no bubbling) with charge >=130g.

Fig(b): Condensing and evaporating temperatures increase with the charging while suction vapour superheat decreases first during the undercharged period and increases slowly during the later overcharged process.

Fig(c): Compressor stores nearly half (42%-53%) of total R290 charge during the undercharged but condenser coil holds the largest during the last overcharged stage.

Any suggestions or comments on the modelling?

This post for discussion is a follow-up to my previous ones at LinkedIn:

https://lnkd.in/g68uaJW

https://lnkd.in/g4kRSq8

https://lnkd.in/gPbb8E7

https://lnkd.in/eBNvrYF

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