09.04.2018
COP vs. COPnet

We are also going to share some thoughts about a very interesting and would say “tricky” topic. Especially regarding the use of heat pumps and that is the COP or coefficient of performance. But before we focus on the topic itself we would like to say that we are going to put some facts to you and at the end you can make your own conclusions, but let’s see what the wise people at Wikipedia say about COP. They say;

The coefficient of performance or COP (sometimes CP or CoP) of a heat pump is a ratio of useful heating or cooling provided to work required. Higher COPs equate to lower operating costs.

Q = Useful heat

W = Work required

The tricky part here is that most of the manufacturers of the classic heat pumps, actually, when they talk about work they include only the work of the compressor and do not include the energy consumption of the fans.

Which means that if they do it this way, the heat pump will extract energy from the ambient air, by using natural convection and that is not correct. We have mechanical fans that we need to extract energy from the ambient air that is why we believe that the real COP should be the useful energy from the system divided by the work coming from the compressors, but also from the fans. Please think about that.

Damvent were the first company to use the phrase COPnet. We did this because in out hybrid integrated system we have 2 sources of heat or heating and cooling, that is the heat recovery but also the heat pump. And we have 2 consumers of energy and these are the compressors and the fans, and we created this universal term COPnet as it is giving you the pure efficiency of the unit including all sources of heating and cooling divided by all consumers of energy. So we truly believe that this is the correct way for COP to be represented.

If we compare the COP of a Hybrid Integrated Solution for fresh air with the COP of a classic system for fresh air. The classic heat pumps use ambient air to extract heat from it, but in our case we use ROOM extract air, therefore what you can expect is that our COP of the refrigerant circuit will be always higher than the COP of the classic system.

On top of that when we talk about COPnet , don’t be surprised if you see numbers above 10 or 12 because the trick is, the higher we go with the delta T between the ambient and room temp the higher is the efficiency of the heat recovery system, the higher is the useful capacity, coming from the heat recovery. That’s how we get coefficients higher than 10 and up to 12.

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