Exergetic evaluation of heat pump booster configurations in a low temperature district heating network

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Standard

Exergetic evaluation of heat pump booster configurations in a low temperature district heating network. / Ommen, Torben Schmidt; Elmegaard, Brian.

Proceedings of ECOS 2012. ed. / Umberto Desideri; Giampaolo Manfrida; Enrico Sciubba. Firenze University Press, 2012.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Harvard

Ommen, TS & Elmegaard, B 2012, 'Exergetic evaluation of heat pump booster configurations in a low temperature district heating network'. in U Desideri, G Manfrida & E Sciubba (eds), Proceedings of ECOS 2012. Firenze University Press.

APA

Ommen, T. S., & Elmegaard, B. (2012). Exergetic evaluation of heat pump booster configurations in a low temperature district heating network. In U. Desideri, G. Manfrida, & E. Sciubba (Eds.), Proceedings of ECOS 2012. Firenze University Press.

CBE

Ommen TS, Elmegaard B. 2012. Exergetic evaluation of heat pump booster configurations in a low temperature district heating network. Desideri U, Manfrida G, Sciubba E, editors. In Proceedings of ECOS 2012. Firenze University Press.

MLA

Ommen, Torben Schmidt and Brian Elmegaard "Exergetic evaluation of heat pump booster configurations in a low temperature district heating network"., Desideri, Umberto Manfrida, Giampaolo Sciubba, Enrico (ed.). Proceedings of ECOS 2012. Firenze University Press. 2012.

Vancouver

Ommen TS, Elmegaard B. Exergetic evaluation of heat pump booster configurations in a low temperature district heating network. In Desideri U, Manfrida G, Sciubba E, editors, Proceedings of ECOS 2012. Firenze University Press. 2012.

Author

Ommen, Torben Schmidt; Elmegaard, Brian / Exergetic evaluation of heat pump booster configurations in a low temperature district heating network.

Proceedings of ECOS 2012. ed. / Umberto Desideri; Giampaolo Manfrida; Enrico Sciubba. Firenze University Press, 2012.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Bibtex

@inbook{c06dc6b229584d4b997172384e1f8eea,
title = "Exergetic evaluation of heat pump booster configurations in a low temperature district heating network",
keywords = "Domestic hot water, Exergy analysis, Heat pumps, Low temperature district heating",
publisher = "Firenze University Press",
author = "Ommen, {Torben Schmidt} and Brian Elmegaard",
year = "2012",
editor = "Umberto Desideri and Giampaolo Manfrida and Enrico Sciubba",
booktitle = "Proceedings of ECOS 2012",

}

RIS

TY - GEN

T1 - Exergetic evaluation of heat pump booster configurations in a low temperature district heating network

A1 - Ommen,Torben Schmidt

A1 - Elmegaard,Brian

AU - Ommen,Torben Schmidt

AU - Elmegaard,Brian

PB - Firenze University Press

PY - 2012

Y1 - 2012

N2 - In order to minimise losses in a district heating network, one approach is to lower the temperature difference between working media and soil. Considering only direct heat exchange, the minimum forward temperature level is determined by the demand side, as energy services are required at a certain temperature. As domestic hot water is required at a temperature range where legionella is no longer a threat, forward temperatures in a traditional low temperature district heating network cannot be lowered beyond approximately 55 ºC. One solution is to boost the temperature of the forward tap water stream with a heat pump, as the remaining heat demands are often not required at temperature levels as high as the tap water. The scope of this work is to evaluate the power consumption and second law efficiency of booster heat pumps for tap water production in a low temperature district heating network. The heat pump and storage arrangement is evaluated based on a tapping sequence from the Danish standards (DS439). Based an initial investigation of possible designs, three configurations have been chosen for the evaluation. Of the three heat pumps, two are implemented on the primary side to boost the network stream, and one is <br/>intended to increase the temperature of the tap water directly. Results show that one of the three configurations are superior to the two remaining, when considering temperature levels of forward stream between 35 ºC and 47 ºC. The overall results remain the same regardless of heat exchanger sizes and the <br/>isentropic efficiency of the compressor used in the heat pump. The superior configuration shows exergetic efficiencies higher than 0.5 when forward temperatures is around 45 ºC.

AB - In order to minimise losses in a district heating network, one approach is to lower the temperature difference between working media and soil. Considering only direct heat exchange, the minimum forward temperature level is determined by the demand side, as energy services are required at a certain temperature. As domestic hot water is required at a temperature range where legionella is no longer a threat, forward temperatures in a traditional low temperature district heating network cannot be lowered beyond approximately 55 ºC. One solution is to boost the temperature of the forward tap water stream with a heat pump, as the remaining heat demands are often not required at temperature levels as high as the tap water. The scope of this work is to evaluate the power consumption and second law efficiency of booster heat pumps for tap water production in a low temperature district heating network. The heat pump and storage arrangement is evaluated based on a tapping sequence from the Danish standards (DS439). Based an initial investigation of possible designs, three configurations have been chosen for the evaluation. Of the three heat pumps, two are implemented on the primary side to boost the network stream, and one is <br/>intended to increase the temperature of the tap water directly. Results show that one of the three configurations are superior to the two remaining, when considering temperature levels of forward stream between 35 ºC and 47 ºC. The overall results remain the same regardless of heat exchanger sizes and the <br/>isentropic efficiency of the compressor used in the heat pump. The superior configuration shows exergetic efficiencies higher than 0.5 when forward temperatures is around 45 ºC.

KW - Domestic hot water

KW - Exergy analysis

KW - Heat pumps

KW - Low temperature district heating

UR - http://www.ecos2012.unipg.it/public/proceedings/html/SOCDP.html

BT - Proceedings of ECOS 2012

T2 - Proceedings of ECOS 2012

A2 - Sciubba,Enrico

ED - Sciubba,Enrico

ER -