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Total Equivalent Warming Impact (TEWI) in air conditioning

Verda Vento is built around the concept of TEWI, but what is this exactly? TEWI stands for Total Equivalent Warming Impact and is a measure to calculate the impact of your air conditioner on the environment. It consists out of a direct (leakages) and indirect (your energy consumption) influence.

What is TEWI in air conditioning?

Detailed formula of the Total Equivalent Warming Impact

Source: Carel website

At Verda Vento we use a concept called TEWI, Total Equivalent Warming Impact. That’s a lot of mumbojumbo, but actually it is not that difficult. We basically take the sum of two items. The first one is the direct impact of the system on global warming and the second one is the indirect impact:

What is Total Equivalent Warming Impact?

Start to make sense? No?

Well every air conditioner has a refrigerant in it, depending on the type of refrigerant it has a Global Warming Potential (better known as GWP). This GWP refers to the contribution a refrigerant has to global warming in case the gas would leak into the atmosphere. This is what we call the direct impact. Therefore it is better to choose a refrigerant with a very low GWP (like the ones we offer with R32 refrigerant – see more details on it in our other blog post). Next to this, choosing for a Verda Vento approved installer will also reduce the risk of any leakages in the atmosphere as we only work with highly qualified installers.

Secondly, we have our indirect impact. This is the impact of the generation of the electricity to operate the equipment over its lifetime. Now this impact is dependant on two things. First of all, how green is your country to generate electricity and secondly how energy efficient is your air conditioner. The first one we can unfortunately not control in the short term, however we can focus on buying more energy efficient air conditioners.

The energy efficiency of an air conditioner is shown the energy label as (S)EER) or (S)COP.

This will represent the energy efficiency of your units in either cooling (SEER) or heating (SCOP). The better your energy efficiency, the lower your energy consumption. That’s great right? Choose a lower consumer, and pay less!

So by choosing a refrigerant that has a reduced impact on the environment and by choosing an energy efficient air conditioner you are reducing your impact on the environment. This is why at Verda Vento we choose the concept of TEWI in airconditioning.

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