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Mapping of domestic hot water circulation losses in buildings – results from 134 measurements

Burke, Stephen LU ; von Seth, Jonatan ; Ekström, Tomas LU ; Maljanovski, Christoffer and Wiktorsson, Magnus LU (2020) 12th Nordic Symposium on Building Physics In E3S Web of Conferences 172.
Abstract
The hot water circulation system in a building is a system which helps prevent Legionella problems whilst ensuring that tenants have access to hot water quickly. Poorly designed or implemented systems not only increase the risk to people’s health and thermal comfort, but even result in an increase in the energy needed for this system to function properly. Results from previous studies showed that the total hot water circulation system loss can be as high as 25 kWh/m2 heated floor area per year. The purpose of this project is to measure the total energy use per year of the hot water circulation system in about 200 multifamily dwellings of different ages to verify that a system loss of 4 kWh/m2, year is a realistic assumption for both newer... (More)
The hot water circulation system in a building is a system which helps prevent Legionella problems whilst ensuring that tenants have access to hot water quickly. Poorly designed or implemented systems not only increase the risk to people’s health and thermal comfort, but even result in an increase in the energy needed for this system to function properly. Results from previous studies showed that the total hot water circulation system loss can be as high as 25 kWh/m2 heated floor area per year. The purpose of this project is to measure the total energy use per year of the hot water circulation system in about 200 multifamily dwellings of different ages to verify that a system loss of 4 kWh/m2, year is a realistic assumption for both newer and older/retrofitted buildings. The preliminary results from the first 134 measurements showed that the assumption of 4 kWh/m2, year is rarely fulfilled. An average energy use of more than three times this is more common, even in newer buildings. Whilst some of the total energy lost is used to heat the buildings, it is not desirable because it is an uncontrolled energy flow. (Less)
Abstract (Swedish)
The hot water circulation system in a building is a system which helps prevent Legionella problems whilst ensuring that tenants have access to hot water quickly. Poorly designed or implemented systems not only increase the risk to people’s health and thermal comfort, but even result in an increase in the energy needed for this system to function properly. Results from previous studies showed that the total hot water circulation system loss can be as high as 25 kWh/m2 heated floor area per year. The purpose of this project is to measure the total energy use per year of the hot water circulation system in about 200 multifamily dwellings of different ages to verify that a system loss of 4 kWh/m2, year is a realistic assumption for both newer... (More)
The hot water circulation system in a building is a system which helps prevent Legionella problems whilst ensuring that tenants have access to hot water quickly. Poorly designed or implemented systems not only increase the risk to people’s health and thermal comfort, but even result in an increase in the energy needed for this system to function properly. Results from previous studies showed that the total hot water circulation system loss can be as high as 25 kWh/m2 heated floor area per year. The purpose of this project is to measure the total energy use per year of the hot water circulation system in about 200 multifamily dwellings of different ages to verify that a system loss of 4 kWh/m2, year is a realistic assumption for both newer and older/retrofitted buildings. The preliminary results from the first 134 measurements showed that the assumption of 4 kWh/m2, year is rarely fulfilled. An average energy use of more than three times this is more common, even in newer buildings. Whilst some of the total energy lost is used to heat the buildings, it is not desirable because it is an uncontrolled energy flow. (Less)
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author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
12th Nordic Symposium on Building Physics (NSB 2020)
series title
E3S Web of Conferences
volume
172
article number
12009
conference name
12th Nordic Symposium on Building Physics
conference location
Tallinn, Estonia
conference dates
2020-06-14 - 2020-06-17
external identifiers
  • scopus:85088480403
DOI
10.1051/e3sconf/202017212009
project
Kartläggning av VVC förlust i flerbostadshus
language
English
LU publication?
yes
id
9a9f4004-72fd-4854-8278-13bfaaa0d871
date added to LUP
2020-01-27 14:11:17
date last changed
2020-08-12 09:01:08
@inproceedings{9a9f4004-72fd-4854-8278-13bfaaa0d871,
  abstract     = {The hot water circulation system in a building is a system which helps prevent Legionella problems whilst ensuring that tenants have access to hot water quickly. Poorly designed or implemented systems not only increase the risk to people’s health and thermal comfort, but even result in an increase in the energy needed for this system to function properly. Results from previous studies showed that the total hot water circulation system loss can be as high as 25 kWh/m2 heated floor area per year. The purpose of this project is to measure the total energy use per year of the hot water circulation system in about 200 multifamily dwellings of different ages to verify that a system loss of 4 kWh/m2, year is a realistic assumption for both newer and older/retrofitted buildings. The preliminary results from the first 134 measurements showed that the assumption of 4 kWh/m2, year is rarely fulfilled. An average energy use of more than three times this is more common, even in newer buildings. Whilst some of the total energy lost is used to heat the buildings, it is not desirable because it is an uncontrolled energy flow.},
  author       = {Burke, Stephen and von Seth, Jonatan and Ekström, Tomas and Maljanovski, Christoffer and Wiktorsson, Magnus},
  booktitle    = {12th Nordic Symposium on Building Physics (NSB 2020)},
  language     = {eng},
  series       = {E3S Web of Conferences},
  title        = {Mapping of domestic hot water circulation losses in buildings – results from 134 measurements},
  url          = {http://dx.doi.org/10.1051/e3sconf/202017212009},
  doi          = {10.1051/e3sconf/202017212009},
  volume       = {172},
  year         = {2020},
}