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Improved reliability of residential heat pumps; Foerbaettrad driftsaekerhet hos villavaermepumpar

Abstract

Today, heat pump heating systems are common in Swedish single-family houses. Many owners are pleased with their installation, but statistics show that a certain number of heat pumps break every year, resulting in high costs for both insurance companies and owners. On behalf of Laensfoersaekringars Forskningsfond, SP Energy Technology has studied the cause of the most common failures for residential heat pumps. The objective of the study was to suggest what measures to be taken to reduce the number of failures, i.e. improving the reliability of heat pumps. The methods used were analysis of public failure statistics and sales statistics and interviews with heat pump manufacturers, installers, service representatives and assessors at Laensfoersaekringar. In addition, heat pump manuals have been examined and literature searches for various methods for durability tests have been performed. Based on the outcome from the interviews the most common failures were categorized by if they; 1. Could have been prevented by better operation and maintenance of the heat pump. 2. Caused by a poorly performed installation. 3. Could have been prevented if certain parameters had been measured, recorded and followed up. 4. Are due to poor quality of components or systems. However, the results show that  More>>
Publication Date:
Jul 01, 2012
Product Type:
Technical Report
Report Number:
SP-RAPP-2012-41
Resource Relation:
Other Information: refs., 18 figs, tabs.
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; HEAT PUMPS; AIR SOURCE HEAT PUMPS; WATER SOURCE HEAT PUMPS; GROUND SOURCE HEAT PUMPS; COEFFICIENT OF PERFORMANCE; HEAT EXCHANGERS; PUMPS; WORKING FLUIDS; FAILURES; RELIABILITY; QUALITY ASSURANCE
OSTI ID:
22060062
Research Organizations:
Swedish National Testing and Research Inst., Boraas (Sweden)
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Other: ISSN 0284-5172; ISBN 978-91-87017-56-8; TRN: SE1307043
Availability:
Commercial reproduction prohibited. Available from ETDE as OSTI ID: 22060062; Also available from: www.sp.se
Submitting Site:
SWD
Size:
113 page(s)
Announcement Date:
Mar 06, 2013

Citation Formats

Haglund Stignor, Caroline, Larsson, Kristin, Jensen, Sara, Larsson, Johan, Berg, Johan, Lidbom, Peter, and Rolfsman, Lennart. Improved reliability of residential heat pumps; Foerbaettrad driftsaekerhet hos villavaermepumpar. Sweden: N. p., 2012. Web.
Haglund Stignor, Caroline, Larsson, Kristin, Jensen, Sara, Larsson, Johan, Berg, Johan, Lidbom, Peter, & Rolfsman, Lennart. Improved reliability of residential heat pumps; Foerbaettrad driftsaekerhet hos villavaermepumpar. Sweden.
Haglund Stignor, Caroline, Larsson, Kristin, Jensen, Sara, Larsson, Johan, Berg, Johan, Lidbom, Peter, and Rolfsman, Lennart. 2012. "Improved reliability of residential heat pumps; Foerbaettrad driftsaekerhet hos villavaermepumpar." Sweden.
@misc{etde_22060062,
title = {Improved reliability of residential heat pumps; Foerbaettrad driftsaekerhet hos villavaermepumpar}
author = {Haglund Stignor, Caroline, Larsson, Kristin, Jensen, Sara, Larsson, Johan, Berg, Johan, Lidbom, Peter, and Rolfsman, Lennart}
abstractNote = {Today, heat pump heating systems are common in Swedish single-family houses. Many owners are pleased with their installation, but statistics show that a certain number of heat pumps break every year, resulting in high costs for both insurance companies and owners. On behalf of Laensfoersaekringars Forskningsfond, SP Energy Technology has studied the cause of the most common failures for residential heat pumps. The objective of the study was to suggest what measures to be taken to reduce the number of failures, i.e. improving the reliability of heat pumps. The methods used were analysis of public failure statistics and sales statistics and interviews with heat pump manufacturers, installers, service representatives and assessors at Laensfoersaekringar. In addition, heat pump manuals have been examined and literature searches for various methods for durability tests have been performed. Based on the outcome from the interviews the most common failures were categorized by if they; 1. Could have been prevented by better operation and maintenance of the heat pump. 2. Caused by a poorly performed installation. 3. Could have been prevented if certain parameters had been measured, recorded and followed up. 4. Are due to poor quality of components or systems. However, the results show that many of the common failures fall into several different categories and therefore, different types of measures must be taken to improve the operational reliability of residential heat pumps. The interviews tell that failures often are caused by poor installation, neglected maintenance and surveillance, and poor quality of standard components or that components are used outside their declared operating range. The quality of the installations could be improved by increasing installers' knowledge about heat pumps and by requiring that an installation protocol shall be filled-in. It is also important that the owner of the heat pump performs the preventive maintenance recommended by the manufacturer and that he/she surveys parameters indicating if satisfying operating conditions are maintained. Another example that could improve the reliability is that the heat pump system is regularly checked by a professional heat pump service technician. Components with sometimes poor quality can for example be temperature sensors, valves and circulations pumps. Compressor failures are often due to the fact that the heat pump of some reason, operates too much outside or close to the usage limits for the compressor and are not necessarily due to poor quality of the component itself.}
place = {Sweden}
year = {2012}
month = {Jul}
}