Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Maccarini, Alessandro; Wetter, Michael; Afshari, Alireza; Hultmark, Goran; Bergsoe, Niels C.; Vorre, Anders

doi:10.1016/j.enbuild.2016.10.051

Title: Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Journal Article · Mon Oct 31 00:00:00 EDT 2016 · Energy and Buildings

DOI: https://doi.org/10.1016/j.enbuild.2016.10.051 · OSTI ID:1436611

Maccarini, Alessandro ^[1]; Wetter, Michael ^[2]; Afshari, Alireza ^[1]; Hultmark, Goran ^[3]; Bergsoe, Niels C. ^[1]; Vorre, Anders ^[3]

Aalborg Univ., Copenhagen (Denmark)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lindab Comfort A/S, Farum (Denmark)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1436611

Journal Information:: Energy and Buildings, Journal Name: Energy and Buildings Journal Issue: C Vol. 134; ISSN 0378-7788

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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