Solar Thermal Installation, Conservatory Retro Fit

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Key Points – Solar Thermal Installation – Conservatory Retro Fit Sheffield, UK
Type of Property / Building Detached bungalow with attached conservatory
Technology Solution Solar Thermal
Type of System Two Calpak VTN 14 panels with 210 litre cylinder

This is the first known solar thermal system to be mounted on to a conservatory. The conservatory faced South but no other roof space was available. The system was mounted on an East West orientation so as to maximise hot water yield & to distribute the weight across the strengthened conservatory evenly.

The system installed allowed integration of solar thermal technology with an in-direct hot water scheme. The scheme utilises an Air Source Heat Pump to provide hot water to the property. A twin coil unvented cylinder is installed so as to allow two sources to heat the cylinder. On days when the solar radiation is limited, any solar energy gained preheats the water in the cylinder, if further heating is required, the heat pump can top it up.

This means that when this water enters the in-direct cylinder, the heat pump only provides the additional heat required to bring the water up to a usable temperature when required, thereby saving energy and utilising all the solar energy gained, even when the available solar energy is modest.

On days when there is a larger amount of solar radiation, the system is able to generate a full cylinder of hot water. When this occurs no heat pump hot water heating costs are incurred. This system is designed to supply 60% to 70% of the annual domestic hot water requirement.

System configuration

System configuration – Solar Thermal Installation – Conservatory Retro Fit Sheffield, UK
Number of PV panels 2 Panels
Weight of each PV Panel 45kg
Area of Panels 5 Square Meters
Type of panels Evacuated tube
Type of roof kit On roof fitted vertically (portrait)
Type of System In-Direct

Performance Benefits / Savings

  • Provides 60-70% of annual domestic hot water requirements
  • Energy costs savings £340 per year
  • Reduced electricity consumption
  • Reduced carbon emissions
  • Extended heat pump life