Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings
Abstract
This paper analyzes the performance of a novel two-pipe system that operates one water loop to simultaneously provide space heating and cooling with a water supply temperature of around 22 °C. To analyze the energy performance of the system, a simulation-based research was conducted. The two-pipe system was modelled using the equation-based Modelica modeling language in Dymola. A typical office building model was considered as the case study. Simulations were run for two construction sets of the building envelope and two conditions related to inter-zone air flows. To calculate energy savings, a conventional four-pipe system was modelled and used for comparison. The conventional system presented two separated water loops for heating and cooling with supply temperatures of 45 °C and 14 °C, respectively. Simulation results showed that the two-pipe system was able to use less energy than the four-pipe system thanks to three effects: useful heat transfer from warm to cold zones, higher free cooling potential and higher efficiency of the heat pump. In particular, the two-pipe system used approximately between 12% and 18% less total annual primary energy than the four-pipe system, depending on the simulation case considered.
- Authors:
-
- Aalborg Univ., Copenhagen (Denmark)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lindab Comfort A/S, Farum (Denmark)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- OSTI Identifier:
- 1436611
- Alternate Identifier(s):
- OSTI ID: 1414631; OSTI ID: 1459391
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Energy and Buildings
- Additional Journal Information:
- Journal Volume: 134; Journal Issue: C; Journal ID: ISSN 0378-7788
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
Citation Formats
Maccarini, Alessandro, Wetter, Michael, Afshari, Alireza, Hultmark, Goran, Bergsoe, Niels C., and Vorre, Anders. Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings. United States: N. p., 2016.
Web. doi:10.1016/j.enbuild.2016.10.051.
Maccarini, Alessandro, Wetter, Michael, Afshari, Alireza, Hultmark, Goran, Bergsoe, Niels C., & Vorre, Anders. Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings. United States. https://doi.org/10.1016/j.enbuild.2016.10.051
Maccarini, Alessandro, Wetter, Michael, Afshari, Alireza, Hultmark, Goran, Bergsoe, Niels C., and Vorre, Anders. Mon .
"Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings". United States. https://doi.org/10.1016/j.enbuild.2016.10.051. https://www.osti.gov/servlets/purl/1436611.
@article{osti_1436611,
title = {Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings},
author = {Maccarini, Alessandro and Wetter, Michael and Afshari, Alireza and Hultmark, Goran and Bergsoe, Niels C. and Vorre, Anders},
abstractNote = {This paper analyzes the performance of a novel two-pipe system that operates one water loop to simultaneously provide space heating and cooling with a water supply temperature of around 22 °C. To analyze the energy performance of the system, a simulation-based research was conducted. The two-pipe system was modelled using the equation-based Modelica modeling language in Dymola. A typical office building model was considered as the case study. Simulations were run for two construction sets of the building envelope and two conditions related to inter-zone air flows. To calculate energy savings, a conventional four-pipe system was modelled and used for comparison. The conventional system presented two separated water loops for heating and cooling with supply temperatures of 45 °C and 14 °C, respectively. Simulation results showed that the two-pipe system was able to use less energy than the four-pipe system thanks to three effects: useful heat transfer from warm to cold zones, higher free cooling potential and higher efficiency of the heat pump. In particular, the two-pipe system used approximately between 12% and 18% less total annual primary energy than the four-pipe system, depending on the simulation case considered.},
doi = {10.1016/j.enbuild.2016.10.051},
journal = {Energy and Buildings},
number = C,
volume = 134,
place = {United States},
year = {Mon Oct 31 00:00:00 EDT 2016},
month = {Mon Oct 31 00:00:00 EDT 2016}
}
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