Method for achieving hydraulic balance in typical Chinese building heating systems by managing differential pressure and flow

Lipeng Zhang, Jianjun Xia, Jan Eric Thorsen, Oddgeir Gudmundsson, Hongwei Li, Svend Svendsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    787 Downloads (Pure)

    Abstract

    Hydraulic unbalance is a common problem in Chinese district heating (DH) systems. Hydraulic unbalance has resulted in poor flow distribution among heating branches and overheating of apartments. Studies show that nearly 30% of the total heat supply is being wasted in Chinese DH systems due to a lack of pressure and flow control. This study investigated using pre-set radiator valves combined with differential pressure (DP) controllers to achieve hydraulic balance in building distribution systems, and consequently save energy and reduce the emissions. We considered a multi-storey building modelled in the IDA-ICE software, along with a self-developed mathematical hydraulic model to simulate its heat performance and hydraulic performance with various control scenarios. In contrast to the situation with no pressure or flow control, this solution achieves the required flow distribution and close-to-design room temperatures, as well as 16% heat savings, 74% pump electricity savings, and proper cooling of supply water. The energy consumption savings would therefore have positive environmental impacts, and be reflected in seasonal reductions of 2.1 kg/m2 CO2, 0.02 kg/m2 SO2, and 0.01 kg/m2 NO x for 3rd step energy efficiency buildings in Beijing.
    Original languageEnglish
    JournalBuilding Simulation
    Volume10
    Issue number1
    Pages (from-to)51-63
    Number of pages13
    ISSN1996-3599
    DOIs
    Publication statusPublished - 2017

    Keywords

    • District heating
    • Hydraulic balance
    • Differential pressure controller
    • Pre-set radiator valve
    • Pressure and flow control
    • IDA-ICE

    Fingerprint

    Dive into the research topics of 'Method for achieving hydraulic balance in typical Chinese building heating systems by managing differential pressure and flow'. Together they form a unique fingerprint.

    Cite this