Non-uniform temperature district heating system with decentralized heat pumps and standalone storage tanks

A. Arabkoohsar

Energy, 2019, vol. 170, issue C, 931-941

Abstract: In this work, the novel concept of non-uniform temperature district heating (NUTDH) system with decentralized heat pumps and standalone heat storage units (HPHS) is proposed. In the NUTDH-HPHS system, the temperature within the transmission pipeline is always at the ultra-low level of 35–40 °C, which is sufficient for space heating use. The heat pumps will increase the temperature within the distribution pipes to 70 °C during a short period of time a day. This temperature is to provide the domestic hot water (DHW) need of the consumers. Heat pumps are sized in neighborhood scale, and as each neighborhood is supplied with a high temperature just for a short time a day, each heat pump may be assigned for a few neighborhoods. As not always high-temperature water is available, the substations are equipped with storage tanks. In this system, the rate of heat loss is minimal, legionella risk is absolutely zero, and there is a strong synergy between the power and heat sectors. The system is designed and analyzed for a case study. The results are also compared with the performance of other popular district heating (DH) schemes. It is demonstrated that the NUTDH-HPHS system shows the best performance.

Keywords: District heating; Non-uniform supply temperature; Decentralized heat pump; Standalone storage unit; Stratified storage tank (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (24)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:170:y:2019:i:c:p:931-941

DOI: 10.1016/j.energy.2018.12.209

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