Efficiency of Underfloor Hydronic Heating Compared to Radiators
Underfloor hydronics combined together with a heat pump, enables for charging and stabilization of electricity demand from renewable energy sources when the suns resources are variable. Using the smart control systems, the home can be used a radiant heating or cooling battery, which can be drawn into the evening and night when solar radiation is not available.
The embedded heat in the room, generated by the underfloor hydronic system will continue to provide sufficient heat, if primed sufficiently to provide adequate heat for up to 3 hours in a well-insulated room. The underfloor hydronic requirement of water temperature amounts to 35-45⁰C, which is low in comparison to regular radiators (60⁰C and above). Taking into account that 35-45⁰C is the range where heat pumps have better efficiency, the underfloor heating combined with heat pump has proven to be the most efficient technology.
The research proves that an underfloor hydronic system consumes less energy and maintains constant air temperature compared to high temperature radiators. Furthermore, the same set operative temperature of underfloor hydronic heating outperform hydronic radiators when it comes to energy savings and CO2 emissions by a factor of 55kW/h m2 per year.
External test results indicate the maximum heat output from screeded floors is approximately 100W/m2, and from timber floating floors is 70W/m2.
The maximum temperature on the floor is dependent on the material of the floor. In relation to the test system, there are two types of floors: timber boards and cement tiles. Tiles, due to their higher thermal conductivity, can be heated to maximum 29⁰C and timber up to 27⁰C.