With reducing energy demand and required installed mechanical system power of modern residences, alternate heat pump system configurations with a possible increased economic viability emerge. Against this background, this paper presents a numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence in a moderate climate, where a covered flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solarfluid heat transfer coefficient was conducted to determine the required solar collector heat transfer characteristics in this system setup. Moreover, solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator “availability” was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achieving this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solarfluid heat transfer coefficient (U-value) with a factor 6–8 compared to the base case with heat exchange between covered solar collector and ambient.

References

References
1.
Lerch
,
W.
, and
Heinz
,
A.
,
2012
, “
Simulation of Different HP/Solar Systems Incl. Waste Water Heat Recovery (WHR) for Low Energy Buildings
,”
IEA SHC Task 44/ HPP Annex 38 Meeting 5
, Povoa, Portugal, May 3–4.
2.
Javed
,
S.
,
2012
, “
Thermal Modeling and Evaluation of Borehole Heat Transfer
,”
Ph.D. thesis
, Building Services Engineering, Department of Energy and Environment, Chalmers University of Technology, Göteborg, Sweden.
3.
Kjellsson
,
E.
,
Hellström
,
G.
, and
Perers
,
B.
,
2010
, “
Optimization of Systems With the Combination of Ground-Source Heat Pump and Solar Collectors in Dwellings
,”
Energy
,
35
(
6
), pp.
2667
2673
.
4.
Bertram
,
E.
,
Pärisch
,
P.
, and
Tepe
,
R.
,
2012
, “
Impact of Solar Heat Pump System Concepts on Seasonal Performance—Simulation Studies
,”
EuroSun 2012 Conference
, Rijeka, Opatija, Croatia, Paper No. 37.
5.
Rad
,
F. M.
,
Fung
,
A. S.
, and
Leong
,
W. H.
,
2009
, “
Combined Solar Thermal and Ground Source Heat Pump System
,”
11th International International Building Performance Simulation Association Conference
(
IBPSA
), Glasgow, Scotland, July 27–30, pp. 2297–2305.
6.
Mehrpooya
,
M.
,
Hemmatabady
,
H.
, and
Ahmadi
,
M. H.
,
2015
, “
Optimization of Performance of Combined Solar Collector-Geothermal Heat Pump Systems to Supply Thermal Load Needed for Heating Greenhouses
,”
Energy Convers. Manage.
,
97
, pp.
382
392
.
7.
Francois
,
L.
,
2013
, “
Installatie van verticale U-vormige warmtewisselaars (versie 4.1)
,” IWT-VIS Traject Smart Geotherm (2011–2017), Agency for Innovation by Science and Technology (IWT), Brussels, Belgium, http://www.smartgeotherm.be/documents/2013/07/warmtewisselaars.pdf
8.
Mojic
,
I.
,
Haller
,
M. Y.
,
Thissen
,
B.
, and
Frank
,
E.
,
2013
, “
Heat Pump System With Uncovered and Free Ventilated Covered Collectors in Combination With a Small Ice Storage
,”
Energy Procedia
,
48
, pp. 608–617.
9.
Heinz
,
A.
,
Lerch
,
W.
,
Breidler
,
J.
,
Fink
,
C.
, and
Wagner
,
W.
,
2013
, “
Wärmerückgewinnung aus Abwasser im Niedrigenergie- und Passivhaus: Potenzial und Konzepte in Kombination mit Solarthermie und Wärmepumpe—WRGpot
,” Bundesministerium für Verkehr, Innovation und Technologie, Wien, Austria, Report No. 3/2013.
10.
Emmi
,
G.
,
Zarrella
,
A.
,
De Carli
,
M.
, and
Galgaro
,
A.
,
2015
, “
An Analysis of Solar Assisted Ground Source Heat Pumps in Cold Climates
,”
Energy Convers. Manage.
,
106
, pp.
660
675
.
11.
Buker
,
M. S.
, and
Riffat
,
S. B.
,
2016
, “
Solar Assisted Heat Pump Systems for Low Temperature Water Heating Applications: A Systematic Review
,”
Renewable Sustainable Energy Rev.
,
55
, pp.
399
413
.
12.
Solar Energy Laboratory
,
2012
, “
TRNSYS 17: A Transient System Simulation Program
,” University of Madison, Madison, WI.
13.
Lienhard
,
J. H.
, IV
, and
Lienhard
,
J. H.
, V
,
2012
,
A Heat Transfer Textbook
,
4th ed.
,
Phlogiston Press
,
Cambridge, MA
.
14.
Duffie
,
J. A.
, and
Beckman
,
W. A.
,
1991
,
Solar Engineering of Thermal Processes
,
2nd ed.
,
Wiley
,
New York
.
You do not currently have access to this content.