Opportunities for improved space heating energy efficiency from fluid property modifications
AffiliationUniversity of Chester
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AbstractUnsteady behaviour of hydronic heating systems causes higher mean room temperatures than are required for comfort. Peak room temperatures depend on interactions between thermostats, heat emitters and the room. The importance of fluid properties on such unsteady heating is often misunderstood meaning potential energy savings are overlooked. This paper demonstrates the influence of fluid modifications and indicates a plausible magnitude of the energy saving opportunity. The results showed that fluid side heat transfer coefficient in isolation had negligible effect. Specific heat capacity of the fluid and flow rates were important, as they altered the amount of embedded energy in the heat emitter when thermostat was met. Reductions in mean heating power for steady demand conditions were between 0 and 7% for plausible changes to fluid properties, depending on heat emitter size, room insulation and external temperature. Reductions in individual cycle energy were between 5 and 25%. When considered in the context of intermittent finite duration heating events, those that contained a small number of thermostat cycles demonstrated energy savings that tended towards the reductions in individual cycle energy. Heating events with larger numbers of cycles showed energy savings tending towards the reduction in mean heating power.
CitationWilliams, A. M., & Innerdale, D. T. (2023). Opportunities for improved space heating energy efficiency from fluid property modifications. Indoor and Built Environment, 32(5), 852-863. https://doi.org/10.1177/1420326X221139094
JournalIndoor and Built Environment
DescriptionWilliams, A. M., & Innerdale, D. T., Opportunities for improved space heating energy efficiency from fluid property modifications, Indoor and Built Environment (Journal Volume Number 32 and Issue Number 5) pp. 852-863. Copyright ©  (The Author(s). Reprinted by permission of SAGE Publications.
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by-nc-nd/4.0/