All heat pump types operate utilizing related principles – by harvesting energy from the atmosphere and ‘compressing’ it to a temperature that can be utilized for a home’s hot water and heating needs.
Most likely the biggest single factor affecting the efficiency of a heat pump is the flow temperature that it’s asked to produce. The higher this temperature the more work the compressor has to do and the less efficient it becomes. Because of this, a heating system that may operate with lower circulation temperatures, equivalent to underfloor heating which typically operates at around 55oC, permits the pump to maximise its effectiveness and reduce each its carbon manufacturing and the fuel costs for the homeowner.
When underfloor heating techniques are specifically designed to be fed by a warmth pump, additional tubing and more efficient ground constructions can be utilized to permit even lower flow temperatures, typically 35oC – 45oC, whilst nonetheless achieving the required air temperature inside the property (averaging 21 pompe de caldura sol apa pret oC in dwelling areas). As a result of smaller surface area of the heat emitter, a traditional radiator system requires a considerably higher movement temperature to achieve the same inside air temperature. Consequently underfloor heating and heat pumps are perfect partners as they are each effectively suited to the low temperatures concerned in maximizing efficiency.
When operating UFH with a GSHP, an open circulation weather compensated system is choosered, with an external sensor checking any deviation in outdoor temperature, comparing stream and return temperatures on the UFH, then adjusting accordingly.
Insulation, insulation, insulation!
With underfloor heating, warmth passes into the room from the ground and it is therefore essential to reduce building heat loss, including downward heat losses into the ground or the floor below. Current modifications to Part L of the Building Regulations have centered consideration on the significance of insulation ranges within home dwellings and in a new building that meets the laws, there will at all times be an adequate stage of ground insulation, and in these circumstances pumps can present 4 to 5 kilowatts of free energy for every 1 kilowatt of electricity used to energy them.
Normally, the purpose should be to insulate the building in order that less than 50 watts of heating are required per sq. meter of ground space. This will then make sure that the UFH water temperatures may be kept to a minimal and the warmth pump can operate at a higher Coefficient of Efficiency (COP) -typically 4 – 5 for a ground source unit. Usually it’s more cost efficient to increase insulation ranges than it is to install a bigger pump and buildings that exceed the necessities of Part L of the Building Rules are most suitable.
In principle, there may be nothing to stop a warmth pump from working in a building with a higher heat loss, such as a property that requires up to eighty watts per square meter. Nevertheless, higher heat loss requires higher heating water temperatures from the heat pump – typically 55°C relatively than 35 – forty five°C, which means the warmth pump’s COP may suffer although the warmth pump should be adequate to warmth the property.