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Effect of boiler oversizing on efficiency: a dynamic simulation study.

George Bennett1, Cliff Elwell1

  • 1University College London, London, UK.

Building Services Engineering Research & Technology : BSER & T
|November 5, 2020
PubMed
Summary
This summary is machine-generated.

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Boiler oversizing in UK homes significantly reduces heating efficiency by 6-9% due to increased on/off cycling. Addressing boiler sizing can lower carbon emissions and improve domestic heating performance.

Area of Science:

  • Building energy performance
  • Domestic heating systems
  • Boiler efficiency analysis

Background:

  • Gas boilers are prevalent in UK domestic heating, with condensing boilers offering efficiency gains.
  • Further efficiency improvements are possible through better control, system specification, and installation practices.
  • Boiler underperformance analysis benefits from dynamic building simulation modelling.

Purpose of the Study:

  • To investigate the relationship between boiler oversizing and on/off cycling using dynamic simulation.
  • To quantify the impact of oversizing on boiler efficiency and internal temperatures.
  • To evaluate the role of plant size ratio (PSR) in boiler performance and energy efficiency.

Main Methods:

  • Dynamic building simulation modelling with detailed heating system components.
Keywords:
Building energy simulationboilerbuildings energy performancedomestic buildingsspace heating

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  • Analysis of boiler performance at various plant size ratios (PSR).
  • Comparison of simulated cycling behaviour with real-world data from UK homes.

    • Main Results:

    • Boiler oversizing (PSR >3) significantly increases cycling frequency, similar to levels observed in real homes.
    • Oversizing leads to a substantial efficiency penalty of 6-9%.
    • A clear correlation exists between higher PSR, increased cycling, and decreased boiler efficiency.

    Conclusions:

    • Current UK legislation and labelling (ErP, SAP) do not account for PSR, missing an opportunity to incentivize appropriate boiler sizing.
    • Reducing boiler oversizing through improved installation practices and certification offers a low-cost method to enhance efficiency and cut carbon emissions.
    • Implementing PSR as an indicator in energy performance certificates (EPCs) can drive significant carbon savings in the existing boiler stock.