/, Contextual, Cooling, DHW, Electric devices, Heating, Lighting, Long term, Other, Owners, Physical environmental, Psychological, Social/2.6.13 Integration of hybrid Photovoltaic Thermal solar collectors (PVT)

2.6.13 Integration of hybrid Photovoltaic Thermal solar collectors (PVT)

2.6.13 Integration of hybrid Photovoltaic Thermal solar collectors (PVT)


Air leaks can be located in all cavities present in the building. It is not simple to find all points of air infiltration, which are not limited to doors or windows, so sometimes it can be necessary to carry out the blower door test. In general, typical infiltration points are situated in the joint of two building materials outside and/or inside. Once infiltration points are found, they should be caulked.


  • The rest of the solar irradiance not converted in electricity by the PV cells and turned into residual heat is transferred through a heat-carrying fluid (such as air or water) to a solar accumulator

  • Increase the electricity production in about 15%

  • Produce more electrical and thermal energy than a corresponding area covered half with conventional PV-panels and half with conventional thermal collectors

  • Reduce the space required by both separated systems by around 40%

  • Provide architectural uniformity on the roof, in contrast to a combination of both PV and thermal systems separated.


  • A design conflict arises between the electrical and thermal performance because to achieve high electricity generation, low quality heat is produced, while if thermal energy is the objective, the electricity generated will be reduced

  • Installing this system requires both piping and cabling for thermal and electrical circuitry respectively, and hybrid units may be  heavier than separate units

  • Any failure of the coolant fluid to circulate through the panel may lead to PV cell  overheating

Economic assessment

A PVT module can reduce the (upfront) investment costs by about 10% compared to the joint use of PV and solar collector modules and also has the potential to reduce the financial and energy payback of PV systems depending on the location.

References and best practices

  • PVT Roadmap A European guide for the development and market introduction of PV-Thermal technology. The 6th Framework Programme: https://www.ecn.nl/docs/library/report/2005/rx05170.pdf

  • A UK-based assessment of hybrid PV and solar-thermal systems for domestic heating and power: System performance: www.sciencedirect.com/science/article/pii/S0306261914000907

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Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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