HEATING
T he majority of the time now, these hydronic modules have been replaced by direct expansion, using refrigerants with the sometimes-additional, i ntegral, heat pumps supplied within the air handling units.
The ability to regulate air temperature entering o ur buildings through adjustments to the refrigerant condensing temperatures have made the use of refrigerant for heating in this manner as good as the level of control by using water. Electric pre-heat batteries would generally t emper any fresh air entering the air handling u nit to meet operating envelopes of the coils or t o add temperature if required to the air being extracted from the building and through the integrated evaporator coil, if the building was cold when the system starts.
To improve efficiency we have started to add direct expansion coils to projects, firstly to reduce t he use of the inefficient electric heater batteries and secondly, to replace return air electric pre heaters.
This not only improves system efficiencies but also aids in the design of buildings with limited power supplies. This type of application has b een made possible through advances in system control and design reducing minimum air flow
temperatures across a DX coil to 5o°C.
O n the domestic
f ront we also have the drive for renewable heating sources using refrigerants, this has t aken the form of air a nd ground source h eating. Refrigerants a re used as the
transfer fluid between either the ambient air or the ground source c ollector and the water t hat circulates around o ur heating systems. Of course, typical heat pump air conditioning
Inverter compressor showing high pressure refrigerant.
systems are also used in domestic application. The development of refrigerants with zero o zone depletion and much lower global warming p otential, have strengthened their usage for the purpose of generating heat, especially when applying across the domestic market. We’ve even started to use refrigerant in our heat pump tumble driers.
Inverter compressor showing high pressure refrigerant.
However, it is the technological developments of each product component that have allowed us to lower the operational temperatures and provide the level of performance that is expected f rom a heating product. These developments have expanded specification and application potential and it is up to the professionals within our industry to maximise their use.
Elitech
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