And they are now able to do this in ever increasing applications. Commonly installed in homes, shops and offices, the technology can now be applied to large commercial and industrial spaces using the Robur ENext Pro split systems.
Each Enext pro heat pump provides 39kW of heating and 35kW of cooling. Each heat pump is connected to a bespoke indoor fan coil/blower. The power input is just 12kW.
The energy output of a heat pump is considerably more than its input, sometimes 4 times as much. But how is this possible? We were taught at school that a machine can’t create energy. That the output can’t exceed the input, that’s against the laws of physics, isn’t it?
The answer is that they don’t create energy, they work by transferring heat from one place to another. To explain this, we can start by rethinking our understanding of the cooling that an air conditioner provides. Rather than thinking of it generating cold air, think instead of it as removing heat from indoors. The liquid refrigerant inside your air conditioner cools the internal coil to around 10°C and fans blow across the cold coil to provide cooling.
At the same time the room air warms the refrigerant, in fact it causes the refrigerant to evaporate internally, and change state from liquid back to gas. The refrigerant, now in gas state, is pumped to the outdoor unit where it is compressed back into a cold liquid. This process releases the heat – the heat that was in the room.
To provide heat, a heat pump simply reverses this process and in this way transfers heat from outside to inside. Even when outdoor temperatures are low, the compression cycle can release heat from the refrigerant by changing its state from gas to liquid.
In this way heat energy is collected from the outside air and transferred internally only using the energy necessary to circulate and compress the refrigerant internally which is considerably less than the useful heat energy transferred.
For more information please email: Cpacey@essaircon.com, visit: Roburheaters.co.uk or call: 020 8641 2346.
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