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 steady-state heating efficiency of conventional air-source heat pumps, and to demonstrate an approach to computer-aided 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 vertical-pipe ground-coupled heat exchangers, and for the detailed performance analysis of air-to-refrigerant heat exchangers with complex refrigerant circuiting by calculating the performance of each tube of the heat exchanger individually. Seasonal performance factors for air-source heat pumps using hour-by-hour 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