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Heat pumps and energy-absorber as heat absorbers; Varmepumpe med energiabsorber som varmeoptager

Technical Report:

Abstract

With regard to heat pumps with uncovered solar collectors as the only heat absorbers, very high temperatures (> 50 deg. centigrade) can arise in the latter during the summer. Other problems are constructional damage when the solar collector is integrated in a building, heat pump dropout in the event of snow drifting, icing or too high temperatures, lower capacity, reduced operational economy, and leakages (especially where alcohol is used as an antifreeze medium) followed by necessary operational closedowns. It should be noted that building regulations demand that there must be no risk of fire or explosions related to heat pump installations. In order to document these problems, questionnaires were sent out and system measurements were taken. The results are presented in detail. System measurements showed that the heat pump`s compressor can be safeguarded from exposure to evaporation temperatures of over 10 deg. centigrade, whilst the flow temperature from the condenser is approximately 54 deg. centigrade, by the use of a thermostatic expansion valve with limited opening possibilities located in the refrigerating circuit. It is recommended that solar collectors used in relation to heat pumps should only be utilized in connection with ground coils, and only if there is sufficient ``ground  More>>
Authors:
Publication Date:
Dec 01, 1992
Product Type:
Technical Report
Report Number:
NEI-DK-1360
Reference Number:
SCA: 320106; 140900; PA: DK-93:001895; EDB-94:018905; NTS-94:008576; ERA-19:006850; SN: 94001129694
Resource Relation:
Other Information: DN: EFP-89; PBD: Dec 1992
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 14 SOLAR ENERGY; GROUND SOURCE HEAT PUMPS; SOLAR COLLECTORS; OPTIMIZATION; FEASIBILITY STUDIES; OPERATION; LEAKS; ICE; TEMPERATURE DEPENDENCE; EXPERIMENTAL DATA; COMPRESSORS; 320106; 140900; BUILDING EQUIPMENT; SOLAR THERMAL UTILIZATION
OSTI ID:
10116488
Research Organizations:
Dansk Teknologisk Inst., Taastrup (Denmark). Proevestationen for Varmepumpeanlaeg
Country of Origin:
Denmark
Language:
Danish
Other Identifying Numbers:
Other: ON: DE94730342; CNN: Contract ENS-1223/89-10; TRN: DK9301895
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
40 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Aagaard, H C. Heat pumps and energy-absorber as heat absorbers; Varmepumpe med energiabsorber som varmeoptager. Denmark: N. p., 1992. Web.
Aagaard, H C. Heat pumps and energy-absorber as heat absorbers; Varmepumpe med energiabsorber som varmeoptager. Denmark.
Aagaard, H C. 1992. "Heat pumps and energy-absorber as heat absorbers; Varmepumpe med energiabsorber som varmeoptager." Denmark.
@misc{etde_10116488,
title = {Heat pumps and energy-absorber as heat absorbers; Varmepumpe med energiabsorber som varmeoptager}
author = {Aagaard, H C}
abstractNote = {With regard to heat pumps with uncovered solar collectors as the only heat absorbers, very high temperatures (> 50 deg. centigrade) can arise in the latter during the summer. Other problems are constructional damage when the solar collector is integrated in a building, heat pump dropout in the event of snow drifting, icing or too high temperatures, lower capacity, reduced operational economy, and leakages (especially where alcohol is used as an antifreeze medium) followed by necessary operational closedowns. It should be noted that building regulations demand that there must be no risk of fire or explosions related to heat pump installations. In order to document these problems, questionnaires were sent out and system measurements were taken. The results are presented in detail. System measurements showed that the heat pump`s compressor can be safeguarded from exposure to evaporation temperatures of over 10 deg. centigrade, whilst the flow temperature from the condenser is approximately 54 deg. centigrade, by the use of a thermostatic expansion valve with limited opening possibilities located in the refrigerating circuit. It is recommended that solar collectors used in relation to heat pumps should only be utilized in connection with ground coils, and only if there is sufficient ``ground coil area`` available. It is suggested that a better and cheaper solution would be to use a standard aggregate with laminar heat surfaces instead of solar collectors/heat absorbers. Here ground coils could be used to join up the system. (AB)}
place = {Denmark}
year = {1992}
month = {Dec}
}