Load management of heat pumps using phase change heat storage

N. J. Kelly, A. D. Hawkes

Research output: Contribution to conferencePaper

Abstract

In the UK, heat pumps are often promoted as the means to provide low-carbon space heating and hot water for future dwellings as the electricity supply decarbonises. However, a major issue with growing heat pump use would be the additional load that this could place on the electrical network at times of peak heat and power demand. A means to alleviate potential demand problems is to stagger the operating times of heat pumps by integrating them with thermal buffering. However, focusing on the domestic sector, substantial volumes of thermal storage would be required to achieve the necessary level of operational flexibility in heat pumps and this poses a particular problem in the UK where the floor areas of urban dwellings are small. Thermal storage featuring phase change material (PCM) offers the potential of more volumetrically efficient heat buffering, which may be more suitable for integration into domestic heating systems. In this paper, the potential to shift the operating time of heat pumps integrated with phasechange- material-enhanced thermal storage is assessed and compared to conventional hot water storage, where the limits of flexible operation are determined by the comfort and hot water needs of the end-user. The results indicate that the use of PCM-enhanced thermal storage can reduce the volume of the buffering required for load shifting by up to 3 times. However, thermal buffering with load shifting can increase heat pump energy demand and (at present) in the UK results in increased emissions and cost penalties for the end user.

Conference

Conference3rd International Conference in Microgeneration and Related Technologies in Buildings
Abbreviated titleMICROGEN III
CountryItaly
CityNaples
Period15/04/1317/04/13
Internet address

Fingerprint

Heat storage
Pumps
Phase change materials
Hot Temperature
Water
Space heating

Keywords

  • heat pump
  • phase change
  • load shift
  • domestic
  • simulation

Cite this

Kelly, N. J., & Hawkes, A. D. (2013). Load management of heat pumps using phase change heat storage. Paper presented at 3rd International Conference in Microgeneration and Related Technologies in Buildings, Naples, Italy.
Kelly, N. J. ; Hawkes, A. D. / Load management of heat pumps using phase change heat storage. Paper presented at 3rd International Conference in Microgeneration and Related Technologies in Buildings, Naples, Italy.10 p.
@conference{002753d92fdb4fc59d1080d42de673b4,
title = "Load management of heat pumps using phase change heat storage",
abstract = "In the UK, heat pumps are often promoted as the means to provide low-carbon space heating and hot water for future dwellings as the electricity supply decarbonises. However, a major issue with growing heat pump use would be the additional load that this could place on the electrical network at times of peak heat and power demand. A means to alleviate potential demand problems is to stagger the operating times of heat pumps by integrating them with thermal buffering. However, focusing on the domestic sector, substantial volumes of thermal storage would be required to achieve the necessary level of operational flexibility in heat pumps and this poses a particular problem in the UK where the floor areas of urban dwellings are small. Thermal storage featuring phase change material (PCM) offers the potential of more volumetrically efficient heat buffering, which may be more suitable for integration into domestic heating systems. In this paper, the potential to shift the operating time of heat pumps integrated with phasechange- material-enhanced thermal storage is assessed and compared to conventional hot water storage, where the limits of flexible operation are determined by the comfort and hot water needs of the end-user. The results indicate that the use of PCM-enhanced thermal storage can reduce the volume of the buffering required for load shifting by up to 3 times. However, thermal buffering with load shifting can increase heat pump energy demand and (at present) in the UK results in increased emissions and cost penalties for the end user.",
keywords = "heat pump, phase change, load shift, domestic, simulation",
author = "Kelly, {N. J.} and Hawkes, {A. D.}",
year = "2013",
month = "4",
day = "15",
language = "English",
note = "3rd International Conference in Microgeneration and Related Technologies in Buildings, MICROGEN III ; Conference date: 15-04-2013 Through 17-04-2013",
url = "http://www.buildup.eu/en/events/3rd-international-conference-microgeneration-and-related-technologies-buildings-microgen-iii",

}

Kelly, NJ & Hawkes, AD 2013, 'Load management of heat pumps using phase change heat storage' Paper presented at 3rd International Conference in Microgeneration and Related Technologies in Buildings, Naples, Italy, 15/04/13 - 17/04/13, .

Load management of heat pumps using phase change heat storage. / Kelly, N. J.; Hawkes, A. D.

2013. Paper presented at 3rd International Conference in Microgeneration and Related Technologies in Buildings, Naples, Italy.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Load management of heat pumps using phase change heat storage

AU - Kelly, N. J.

AU - Hawkes, A. D.

PY - 2013/4/15

Y1 - 2013/4/15

N2 - In the UK, heat pumps are often promoted as the means to provide low-carbon space heating and hot water for future dwellings as the electricity supply decarbonises. However, a major issue with growing heat pump use would be the additional load that this could place on the electrical network at times of peak heat and power demand. A means to alleviate potential demand problems is to stagger the operating times of heat pumps by integrating them with thermal buffering. However, focusing on the domestic sector, substantial volumes of thermal storage would be required to achieve the necessary level of operational flexibility in heat pumps and this poses a particular problem in the UK where the floor areas of urban dwellings are small. Thermal storage featuring phase change material (PCM) offers the potential of more volumetrically efficient heat buffering, which may be more suitable for integration into domestic heating systems. In this paper, the potential to shift the operating time of heat pumps integrated with phasechange- material-enhanced thermal storage is assessed and compared to conventional hot water storage, where the limits of flexible operation are determined by the comfort and hot water needs of the end-user. The results indicate that the use of PCM-enhanced thermal storage can reduce the volume of the buffering required for load shifting by up to 3 times. However, thermal buffering with load shifting can increase heat pump energy demand and (at present) in the UK results in increased emissions and cost penalties for the end user.

AB - In the UK, heat pumps are often promoted as the means to provide low-carbon space heating and hot water for future dwellings as the electricity supply decarbonises. However, a major issue with growing heat pump use would be the additional load that this could place on the electrical network at times of peak heat and power demand. A means to alleviate potential demand problems is to stagger the operating times of heat pumps by integrating them with thermal buffering. However, focusing on the domestic sector, substantial volumes of thermal storage would be required to achieve the necessary level of operational flexibility in heat pumps and this poses a particular problem in the UK where the floor areas of urban dwellings are small. Thermal storage featuring phase change material (PCM) offers the potential of more volumetrically efficient heat buffering, which may be more suitable for integration into domestic heating systems. In this paper, the potential to shift the operating time of heat pumps integrated with phasechange- material-enhanced thermal storage is assessed and compared to conventional hot water storage, where the limits of flexible operation are determined by the comfort and hot water needs of the end-user. The results indicate that the use of PCM-enhanced thermal storage can reduce the volume of the buffering required for load shifting by up to 3 times. However, thermal buffering with load shifting can increase heat pump energy demand and (at present) in the UK results in increased emissions and cost penalties for the end user.

KW - heat pump

KW - phase change

KW - load shift

KW - domestic

KW - simulation

M3 - Paper

ER -

Kelly NJ, Hawkes AD. Load management of heat pumps using phase change heat storage. 2013. Paper presented at 3rd International Conference in Microgeneration and Related Technologies in Buildings, Naples, Italy.