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Ground source heat pump control methods for solar photovoltaic-assisted domestic hot water heating

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  • Knuutinen, Jere
  • Böök, Herman
  • Ruuskanen, Vesa
  • Kosonen, Antti
  • Immonen, Paula
  • Ahola, Jero

Abstract

Domestic hot water (DHW) heating is one of the most energy-consuming activities in a typical household. Photovoltaics (PV) connected with a ground source heat pump (GSHP) offers a low-emission method for DHW heating. This paper studies four different control methods for DHW heating in a building with a GSHP and a PV system. The main control method aims to minimize DHW heating costs by utilizing Nord Pool Spot market information together with a PV production output forecast. The results of this control method, implemented with a perfect PV output forecast and assessed over three years of hourly data, indicate that annual cost savings over other methods are achievable. Results with the real-world actual PV output forecast, evaluated between June–September 2020, demonstrate DHW heating cost savings up to 36–53%, even though forecasting errors are present. The heating costs are 9–11% higher compared against the perfect forecast case. The suggested control method thereby effectively reduces the costs when compared with all other methods, and its performance is not significantly affected even when an actual imperfect forecast is implemented. The results also indicate that minimizing energy consumption does not offer the lowest cost.

Suggested Citation

  • Knuutinen, Jere & Böök, Herman & Ruuskanen, Vesa & Kosonen, Antti & Immonen, Paula & Ahola, Jero, 2021. "Ground source heat pump control methods for solar photovoltaic-assisted domestic hot water heating," Renewable Energy, Elsevier, vol. 177(C), pages 732-742.
    • Handle: RePEc:eee:renene:v:177:y:2021:i:c:p:732-742
    DOI: 10.1016/j.renene.2021.05.139
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    References listed on IDEAS

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