IEA HPP Annex 28 – standardised testing and seasonal performance calculation for multifunctional heat pump systems

2008 ◽  
Vol 28 (16) ◽  
pp. 2062-2069 ◽  
Author(s):  
Carsten Wemhoener ◽  
Thomas Afjei ◽  
Ralf Dott
Keyword(s):  
Heat Pump ◽  
Seasonal Performance ◽  
Standardised Testing ◽  
Performance Calculation

A TRNSYS/GROCS Simulation of the TECH House I Ground-Coupled Series Solar-Assisted Heat Pump System

1983 ◽  
Vol 105 (4) ◽  
pp. 446-453 ◽  
Author(s):  
D. J. Roeder ◽  
R. L. Reid
Keyword(s):  
Heat Pump ◽  
Storage Tank ◽  
Heating System ◽  
Electric Resistance ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Seasonal Performance ◽  
The University ◽  
Better Than

The series solar-assisted heat pump heating system with ground-coupled storage in The University of Tennessee’s TECH House I in Knoxville, Tennessee, has been modeled using TRNSYS/GROCS and was compared to the experimental performance for the 1980–81 heating season. The simulation results were within 8 percent of the experimental measurements. Both simulation and experimental results showed that ground coupling of thermal storage led to the elimination of electric resistance backup heat and a large reduction in the peak heating demand of the house. Results of a parametric study showed that, in general, a ground-coupled storage tank performs better than a storage tank placed outdoors in the Knoxville area. Application of a next generation heat pump resulted in the most significant impact on the seasonal performance factor. As expected, higher performance collectors and larger collector areas led to higher system seasonal performance. An economic analysis showed that the series solar heat pump system cannot economically compete with the stand-alone heat pump system in the Knoxville area.

A TRNSYS/GROCS Simulation of a Horizontal Coil Ground-Coupled Heat Pump

1986 ◽  
Vol 108 (3) ◽  
pp. 185-191 ◽  
Author(s):  
F. Conlin ◽  
W. S. Johnson ◽  
S. Wix
Keyword(s):  
Thermal Conductivity ◽  
Heat Pump ◽  
Winter Season ◽  
Soil Thermal Conductivity ◽  
Pump System ◽  
Actual Performance ◽  
Heat Pump System ◽  
Seasonal Performance ◽  
Ground Coupled Heat Pump ◽  
Improved Performance

The ground-coupled heat pump system in TECH House I at the University of Tennessee has been modelled using TRNSYS/GROCS and the results have been compared with actual performance data for both the 1982–83 heating season and the 1983 cooling season. Hourly measurements of various ground temperatures, conditioned space temperatures, power requirements and heat transferred to or from the ground and the conditioned space were made. Results indicate that the model prediction is within 5 percent of the measured seasonal performance factor for both the summer and winter season. Parametric studies were undertaken to examine the effect of ground coil length, soil thermal conductivity, and the heat pump performance rating on the overall seasonal performance of the system. Overall performance is shown to increase with improved performance and increased soil thermal conductivity while the coil length shows an optimum value due to the increase of pumping power with length.

scholarly journals Seasonal Performance of a Combined Solar, Heat Pump and Latent Heat Storage System

2014 ◽  
Vol 48 ◽  
pp. 689-700 ◽  
Author(s):  
Christian Winteler ◽  
Ralf Dott ◽  
Thomas Afjei ◽  
Bernd Hafner
Keyword(s):  
Latent Heat ◽  
Heat Pump ◽  
Heat Storage ◽  
Storage System ◽  
Latent Heat Storage ◽  
Solar Heat ◽  
Seasonal Performance

scholarly journals Fixing Efficiency Values by Unfixing Compressor Speed: Dynamic Test Method for Heat Pumps

2019 ◽  
Author(s):  
Carsten Palkowski ◽  
Andreas Zottl ◽  
Ivan Malenkovic ◽  
Anne Simo
Keyword(s):  
Dynamic Behavior ◽  
Heat Pump ◽  
Performance Test ◽  
Dynamic Testing ◽  
Dynamic Test ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Test Method ◽  
Temperature Changes ◽  
Seasonal Performance

The growing market penetration of heat pumps indicates the need for a performance test method which better reflects the dynamic behavior of heat pumps. In this contribution, we developed and implemented a dynamic test method for the evaluation of the seasonal performance of heat pumps by means of laboratory testing. Current standards force the heat pump control inactive by fixing the compressor speed. In contrast, during dynamic testing, the compressor runs unfixed while the heat pump is subjected to a temperature profile. The profile consists of the different outdoor temperatures of a typical heating season based on the average European climate and also includes temperature changes to reflect the dynamic behavior of the heat pump. The seasonal performance can be directly obtained from the measured heating energy and electricity consumption making subsequent data interpolation and recalculation with correction factors obsolete. The method delivers results with high precision and high reproducibility and could be an appropriate method for a fair rating of heat pumps.

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