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Heat
Pumps
Green Air Technologies are installers of Daikin Air source heat pumps. Here are some of the basics: |
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| How do Heat Pumps work?
Basically like a fridge in reverse!
- A heat pump contains refrigerant, which is colder that the outside air (boiling point -48.5 C). Air is drawn into a heat exchanger where the refrigerant absorbs the latent heat from the outside air and evaporates.
- The vaporised refrigerant is then compressed increasing its pressure and temperature, (effectively concentrating the heat).
- This hot vapour is condensed in the second heat exchanger and the heat is then transferred to water for space heating or domestic hot water after which the vapour condenses back into a liquid.
- The liquid refrigerant passes back through an expansion valve, ready to start the cycle again.
Click here to watch an online demonstration.
Main benefits of Daikin Heatpumps
- They provide great savings on hot water and heating costs.
- Easy retrofit, they can be used as a direct replacement for your oil/gas burners and use your existing radiators.
- Very high efficiency.
- It is a renewable technology, so no more need for Fossil Fuels.
- Heat pumps will improve your homes BER and its value.
- They automatically adjust to the outside temperature.
- They are low maintenance and require minimal servicing.
- They are particularly suited to underfloor heating systems.
If we look at an 80m2 house using 250kWh/m2 /yr for heating, we can develop a cost comparison between a high efficiency oil boiler and a Daikin Alterma Heat pump. *The following figures are sourced from the SEAI publications: www.seai.ie/Publications/Statistics_Publications/Fuel_Cost_Comparison/
High efficiency Condensing Oil Boiler - A litre of Home Heating Oil provides 10.55kWh units
- One litre of Home Heating Oil costs €0.81
- ∴1 kWh unit costs €0.076
- High efficiency boiler operating at 95% efficiency
- An input of 21,000kWh/yr. is needed to provide a 20,000kWh/yr. output.
21,000 x €0.076 cents = €1,596/yr.
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Daikin Heatpump
- ESB Day Rate is currently €0.15/kWh & Night Saver Rate is €0.08/kWh unit
- Heatpump run 60% day rate / 40% night rate
- Average kWh unit cost of €0.13
- Daikin Alterma Heatpump has a Coefficient of Performance on average of 3.5 (1kWh consumed = 3.5kWh of heat outputted)
- 20,000 kWh units of heat requires 5,714kWh units of energy to run the heatpump
- Heatpump cost for house = 5,714 x €0.13c = €742.82
€1,596 - €742.82 = €853.18
This represents a saving on heating costs of almost 54% per annum.
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