10 Questions You Should to Know about evi heat pump

10-year report on air source heat pumps in a 's house.

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 One of the great mysteries in renewables is that so many of the people who work in this sector don&#;t have the technologies installed in their own houses. At freedom heat pumps we believe in testing the units on our directors before selling them to our customers. Here is the story of my house and its life using air source heat pumps.

In we purchased a , 3-bedroom 107 m^2 detached house. It had no loft insulation, no cavity wall insulation and single glazed windows, vented floors made of wood downstairs and 3 open fireplaces.  It had an ancient G rated gas boiler and a single pipe radiator system. Immediately we had cavity wall and loft insulation installed.

At the time I worked for a Daikin distributor, we were flogging Altherma split units, my boss sold me an 8 kW Altherma split unit which had been used in a show room and a cylinder which was common at the time. I installed it myself and set it working. this was before the days of MCS and government grants. No heat loss was completed or rad calculations, we just winged it. The idea back then was to install a unit of roughly the right size and use the backup heaters in the unit to help if the heat pump struggled. It was an interesting plan and worked very well if the heaters were not used much. We were all learning fast. From the beginning I wanted to measure how much energy I was using and see if I could improve the house and the system. I will share the figures later in this report.

11/2/ Daikin Altherma Split installed with inbuilt backup heaters.

Daikin Altherma split, installed, note the indoor unit (hydro box) on the left and the back of the outdoor unit on the right.

In June I started Freedom heat pumps, we were the first and only distributor of Samsung heat pumps in Europe. From day one we insisted that guessing the heat load was a bad idea, so we built a calculator and rad sizing tool and off we went. Samsung at the time only offered a Split range of units, it was very similar to the Daikin range. In early Samsung were developing the brand-new Gen 3 mono bloc unit at the time, so I waited to get the prototype unit before installing it in my house.

The prototype Samsung mono bloc was delivered in November . We carried out the heat loss and installed it, a 9 kW mono with no backup heaters and a new Gledhill heat pump cylinder to improve hot water performance.

30/11/ Generation 3 Samsung EHS monobloc installed. 6.8 kW heat loss at -1.8C and 21 degree room temps predicted heat to be supplied kWhrs a year.

 Samsung EHS gen 3 prototype installed, the first Samsung monobloc in the world. Note the single glazed windows.

In November we had double glazing fitted, the heat loss was redone, 6.0 kW heat loss at -1.8 C and 21 degree room temps, predicted heat to be supplied kWhrs a year.

In April the MCS scheme came into play allowing me to claim RHI. It was a nightmare and took 6 weeks to complete. My first payment was 3/9/. So far this is my payment schedule. Its index linked hence the rise in the payment over the years.

The unit ran perfectly, but Samsung introduced an upgraded unit in , again the prototype was installed in my house to test it in the field before letting it into the market. The unit was very similar to its predecessor, the main upgrades being a new controller and software, the hardware had not changed.

 21/8/ Generation 5 Samsung EHS monobloc installed. 6.0 kW heat loss at -1.8 C and 21-degree room temps predicted heat to be supplied kWhrs a year.

New Samsung generation 5 unit in the foreground with the Gen 3 unit behind. Note the Gen 5 (right) unit is on feet, they are actually the same size. Again, the unit ran faultlessly, data was collected and recorded see below.

The world of heat pumps does not stay still for long, New models are always coming but often they are just face-lifted old units. In that was all to change, it was the year of the new higher temperature and less environmentally damaging R32 refrigerant. Units using this gas allow slightly higher run temperatures and enhanced efficiencies over the R410A units, It was time for a change so I replaced my system with Hitachi&#;s ridiculously small Mini Mono 9 kW unit with no backup heaters.

30/11/ Hitachi Yutaki Mini Monobloc installed. 6.0 kW heat loss at -1.8 C and 21-degree room temps predicted heat to be supplied kWhrs a year.

Hitachi Mini Mono next to its predecessor the Samsung 9 kW mono Gen 5. Note the Hitachi unit is smaller, has 10% higher capacity and runs at temperatures up to 60 C. (it&#;s also cheaper).

 Over the last 10 years we have improved the data logging for the system and have recorded not only power used but also power used by the heat pump, the house on its own (minus the heat pump) and from October a heat meter was also installed to measure actual heat produced.

The Figures:

This graph plots the date against the total house electricity use in Blue and the electricity used for the heat pump in orange.

Things to note:

No electricity meter was installed on the heat pump until October .

Note how the background use (lights, internet etc.) is consistent throughout the year.

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The heat pumps usage is very seasonal as you would expect.

Winter and spring were unseasonably warm,

The double glazing installed in December made no difference to the energy usage.

To increase comfort, we started to run the unit 24/7 at 21 C from Autumn on wards. My wife was fed up of having a house at 19.5 C.

Below are the annual figures for the house.

 Note how background use is slowly falling, new led light-bulbs, more efficient white goods etc. helped here. The heating figure is all over the place, its all down to the weather and the room temperature in the house.

Note how the COP is about 2.6 average, this is for heating and hot water provision, we do not measure these two separately. The figure is what we expect if we also include electricity use for the pumps, valves, controls etc. therefore the measured figure is slightly lower than the figures from the MCS figures online.

In a boiler the electricity consumption is not considered when measuring the efficiency either. 90% efficiency refers only to gas usage and heat provided.

Note how we are providing between and kWhrs of heat per year against the predicted kWhrs from my MCS heat loss calculation tool.

 Conclusion:

What have we learnt? heat pumps do work in old houses if the maths is done my someone who knows what they are doing.

MCS heat losses will provide actual figures you can rely on, the MCS calculation tools are very accurate if taken over a number of years.

Heat pumps have not improved much in the last 10 years, but they are getting hotter and smaller.

Double glazing makes the house more comfortable but doesn&#;t help with your run costs.

Running the heat pump 24/7 is the best thing to do, its more comfortable and costs the same as switching the heat pump on and off.

We have to wait a few more months before we can see how the Mini mono Hitachi looks compared to the Samsung. And remember has been unseasonably wet and warm.

Any questions just call

Ask someone who has got one of these things in their house.

Utilizing a DC inverter enhances the efficiency of the heat pump&#;s operation. Studies indicate that the working efficiency of a DC inverter compressor surpasses that of an AC inverter compressor by 10% to 30%.

At the same time, EVI Technology allows the heat pump to absorb more heat from ambient air at lower climatic conditions, guaranteeing consistent performance even in extreme ambient temperatures as cold as -25°C.

Contact us to discuss your requirements of R290 DC Inverter Heat Pump. Our experienced sales team can help you identify the options that best suit your needs.