On Saturday 25th March 2017, households with an average 4.6m2 solar thermal installation may expect to see approximately 100% of their hot water requirements generated by the sun, during this time period.
This is the equivalent to:
- 0.92 litres of oil
- 0.84m³ of gas
- 7.1kWh for an electric heater
- 1.6kg of pellets
To come up with these figures a number of statistical and technical assumptions are made:
- An average solar thermal installation is 4.6m2 and sits on a south facing roof.
- The average hot water tank for those households with an average solar thermal installation is 210 litres.
- The average household uses 122 litres of hot water a day.
With the insolation and temperature data [W/m²*h] given by EPICES on an hourly basis for every virtual point, the production data is calculated for the solar thermal technology, by introducing the insolation data into a thermal model specifically designed for the project. This model is an adaptation of TRNSYS software which takes weather changes into consideration.
Not getting this out of your solar thermal? Have a look at the 'How it works' page to see if there is something that might be affecting the productivity of your system.