Heat pump R and D at Oak Ridge National Laboratory
Abstract
Heat pump system and component performance evaluations at steady state and under frosting conditions are described. A computer model of electric motor driven heat pumps was developed to explore the practical limits of steadystate heating efficiency of conventional airsource heat pumps, and to demonstrate an approach to computeraided heat pump design techniques. Scoping calculations of alternative heat pump systems, such as aircycle heat pumps and electric motor driven Stirling heat pumps are presented. Computer programs were written to model the expected performance of verticalpipe groundcoupled heat exchangers, and for the detailed performance analysis of airtorefrigerant heat exchangers with complex refrigerant circuiting by calculating the performance of each tube of the heat exchanger individually. Seasonal performance factors for airsource heat pumps using hourbyhour calculations with empirical temperature dependent degradation factors were estimated.
 Publication:

Presented at DOE Heat Pump Contractors' Program Integration Meeting
 Pub Date:
 1981
 Bibcode:
 1981hpcp.meet....2E
 Keywords:

 Heat Pumps;
 Mathematical Models;
 Performance Tests;
 Thermodynamic Efficiency;
 Computer Aided Design;
 Computer Programs;
 Heat Exchangers;
 Heat Sources;
 Stirling Cycle;
 Fluid Mechanics and Heat Transfer