The experimental work conducted in a companion investigation (ASHRAE RP-622) has documented the energy penalty associated with using hot-gas defrosting in industrial freezers. This penalty is realized by the large amount of the defrost heat input being transferred to the refrigerated space due to the evaporation of the melt and sublimation of frost (latent heat), as compared with the smaller amount that is utilized to melt the frost. Part of this penalty is also attributed to the residual heat that goes into the refrigerant during the defrosting process. This heat has to be extracted from the system during the refrigeration portion of the R/D cycle. The work described in this paper attempts to model the hot-gas defrosting process and quantify the effects of the different factors that influence it.
Units: I-P
Citation: Symposium, ASHRAE Transactions, 1998, Vol 104, pt. 1A, San Francisco
Product Details
- Published:
- 1998
- Number of Pages:
- 7
- File Size:
- 1 file , 150 KB
- Product Code(s):
- D-7941
