Methods to shorten the defrost time on a heat pump air conditioner were studied. The experiment was carried out using a one horsepower heat pump, and the energy balance during defrosting was analyzed. We found that the following methods are effective to shorten the defrosting time: (1) increase in power input to the compressor during defrosting, (2) utilization of the compressor for energy storage, and (3) reduction of the water left on the outdoor heat exchanger.
A heat pump with the new defrosting system was constructed on an experimental basis. Its defrost time was 1 minute and 55 seconds under the defrost condition of Japanese Industrial Standard. The defrost time of a conventional heat pump is about 4 or 5 minutes.
Units: SI
Citation: ASHRAE Transactions, 1986, vol. 92, pt. 2A, Portland, OR
Product Details
- Published:
- 1986
- Number of Pages:
- 10
- File Size:
- 1 file , 890 KB
- Product Code(s):
- D-PO-86-2974
