How It Works
The Energy Saver uses air-source heat pump technology. A heat pump is an electrical
device that extracts heat from one place and transfers it to another. The heat pump is not a new technology;
it has been used around the world for decades. Refrigerators and air conditioners are both common examples of heat pumps.
Heat pumps transfer heat by circulating a substance called a refrigerant through a cycle of
alternating evaporation and condensation. A compressor pumps the refrigerant between two
heat exchanger coils. In the outdoor unit coil, the refrigerant is evaporated at low pressure and absorbs
heat from its surroundings. The refrigerant is then compressed on its way to the indoor unit coil,
where it condenses at high pressure. At this point, it releases the heat it absorbed earlier
in the cycle.
A diagram of a heat pump:
1) condenser coil 2) expansion valve
3) evaporator coil 4) compressor
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The efficiency does decrease with temperature because it is more
difficult to extract heat from cooler air. This figure shows how
the efficiency is affected by cooler air temperature.
The EHS Energy saver retains 80 % of the total capacity at - 4 º C, and is certified to work down to minus 15º C,
where it still retains 65-70 % of the total capacity.
Additional heating should rarely be needed in England or Wales, but may be needed in Scotland where the temperature can fall down below minus 10º C
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This ability to absorb heat from the surrounding out-side air and send
that inside to heat up your house can be highly efficient. The Energy Saver can produce as much as 4.2 kW (kilowatt) of heating
energy from 1 kW electricity supplied, however the efficiency will decrease slightly at cooler outside air temperatures - 85% remaining at minus 8 degrees.
As a comparison an electric radiator produces exactly 1 kWh of heating
energy from 1 kWh supplied. The best condensing gas boilers produce
up to 0.8 kWh per kWh of gas supplied. An oil fired boiler delivers
similar efficiency.
Contact: info@eheatgroup.com, 01628 566105
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