Low-Temperature Heating with Heat Pumps in Single Family Houses: Design Requirements and Future Perspectives
(English)Manuscript (preprint) (Other academic)
This study explored the potential of low-temperature space heaters connected to a heat pump in single-family dwelling in a broader context. The aim was to map the parameters that have the greatest impact on the thermal performance of this type of heating systems and their CO2 emissions. The results suggest that the ability of a heating system to be operated with a low-temperature supply depends to a large extent on the heating demand of a building, and the size, type and efficiency of the space heaters.It was shown that an increase in the water flow rate from 0.01 to 0.05 kg/s would significantly increase the heat outputs from analyzed heating systems. Consequently, this would also improve the efficiency of closed-loop heat pumps connected to these systems. This change would not increase the pumping power need, nor would it create noise problems if the distribution pipes and thermostatic valves were properly selected. It was further demonstrated that the efficiency of the heat pumps could be additionally improved by halving the energy needs for the domestic hot-water and circulation pumps. The results also suggest that the exergy need is significantly lower in heating systems that are operated with small temperature drops.
Low-temperature heating, Energy efficiency, CO2 emissions, Heat pump, Hydraulic losses, System analysis
Research subject Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-193104OAI: oai:DiVA.org:kth-193104DiVA: diva2:975166