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A case study for a planned multi-family house with ground-coupled heat pump is presented. The heat supply concept combines a high-level heat source with low temperature heat supply with decentral instantaneous water heaters and underfloor heating in a 4-pipe system. The system is simulated in TRNSYS to dimension the components and to predict the performance. A combination with photovoltaic-thermal collectors with horizontal ground heat exchanger ensures sustainable operation of the ground heat exchanger, and allows to reduce its required area by 50% without reducing the seasonal performance factor. In this study, two types of photovoltaic-thermal collectors are examined in detail: an uncovered collector with fins on the backside and an insulated collector. The uncovered collector’s advantages as the sole heat source for heat pumps are evident only in undersized ground heat exchanger systems, but negligible in properly sized systems. Given that the price of the insulated collector is only one-third that of the uncovered photovoltaic-thermal collector, the insulated collector will be chosen for the building.

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High-Efficient Heat Supply System for a New Multi-family House with a PVT- and Ground-Coupled Heat Pump and Decentral Heat Interface Units in a Four-Pipe System

  • 会议论文

  • 发表日期：

    2026年

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  • Christoph Büttner,
  • Peter Pärisch,
  • Bharat Chhugani,
  • Federico Giovannetti

摘要

A case study for a planned multi-family house with ground-coupled heat pump is presented. The heat supply concept combines a high-level heat source with low temperature heat supply with decentral instantaneous water heaters and underfloor heating in a 4-pipe system. The system is simulated in TRNSYS to dimension the components and to predict the performance. A combination with photovoltaic-thermal collectors with horizontal ground heat exchanger ensures sustainable operation of the ground heat exchanger, and allows to reduce its required area by 50% without reducing the seasonal performance factor. In this study, two types of photovoltaic-thermal collectors are examined in detail: an uncovered collector with fins on the backside and an insulated collector. The uncovered collector’s advantages as the sole heat source for heat pumps are evident only in undersized ground heat exchanger systems, but negligible in properly sized systems. Given that the price of the insulated collector is only one-third that of the uncovered photovoltaic-thermal collector, the insulated collector will be chosen for the building.