How on earth can you get heat out of very cold outside air? How can a heat pump make heat out of cold air?
Via the state change of some very interesting gases the magic happens.
A heat pump can do some very amazing things in terms of making heat. To understand the way in which it works you must first understand what occurs when certain gases change from a liquid to a gas and back to a liquid again. To simplify it a bit we can have a look at a fundamental air-con system. The refrigerant in an air con system is modified to a liquid in the outside condenser. The compressor compresses the gas forming a hot gas. As this gas cools beneath high pressure it adjustments right into a liquid form. Inside the indoor unit the liquid is pushed through a small hole or orifice. When it comes out the other side it rapidly modifications to a gas as the pressure instantly drops. The speedy pressure drop modifications the refrigerant to a really cool gas. Air flowing over the cool gas inside the pipes makes the air cool and offers air conditioning.
Now for a heat pump the process is far the same. The coils are just switched by used a reversing valve within the outdoor condenser unit. Instead of the heat being discharged to the outside from the condenser unit, the indoor unit becomes the condenser coil. The outside coil now becomes the cold coil and cools the outside. That’s the reason whether it is too cold outside the unit should run in air conditioning mode for a short time to defrost the outside cold coil. During this time the system will normally have electrical heat inside to run and maintain the indoor air warm.
Now you understand that a heat pump is really no more than an air conditioner running in reverse. Via the magic of utilizing refrigerants a heat pump can run many instances more efficiently than straight electric heat.
A careful heat loss/gain ought to all the time be carried out by a qualified individual before any sizing of a unit. Too giant or too small of a heat pump system can cause it to be inefficient and presumably cause it to be very uncomfortable. The longevity of the unit will also be affected by sizing and installation. Be affected person and look diligently for one of the best contractor to put in your system.
A correctly designed and installed system can provide a few years of consolation and efficiency. In case you search for and find the appropriate contractor to do the job proper you will get many bother free comfortable years out of your heat pump unit.