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3085 — A Study of the Primary Effects of Various Means of Refrigerant Flow Control and Capacity Control on the Seasonal Performance of a Heat Pump

$7.50

Conference Proceeding by ASHRAE, 1987

Category:

Description

A study of the primary effects of various means of refrigerant mass flow rate control and capacity control on the seasonal performance of a heat pump was made. The heat pump performance characteristics considered in this study were determined by computer simulation. Four basic means of refrigerant mass flow rate control were simulated: 1. Superheat control. An expansion valve responding to the amount of superheat downstream of the evaporator is used as the throttling device. 2. Capillary tube control. A capillary tube is used as the throttling device. 3. Evaporation pressure control. A variable orifice expansion valve responding to the evaporation pressure is used as the throttling device, or a limited refrigerant charge is used with a fully opened throttling device or capillary tube. 4. Variable-speed compressor. An inverter-controlled variable-speed compressor is used.

The study indicates that the use of a variable-speed compressor rather than a single-speed compressor may improve the seasonal performance factor significantly and result in an annual energy saving increase of approximately 5%. The study also indicates that limiting the capacity of a heat pump by means of an expansion valve responding to the heating load may not improve the seasonal performance factor.

Units: Dual

Citation: ASHRAE Transactions, 1987, vol. 93, pt. 2, Nashville, TN

Product Details

Published:
1987
Number of Pages:
14
File Size:
1 file , 1 MB
Product Code(s):
D-NT-87-3085