The most commonly asked questions about Air Source Heat Pumps II

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7.What will happens to the performance of the air source heat pump if the air temperature drops or higher setting water temperature?

All air source heat pumps will have a decrease in output if the air temperature is cooler than the standard test conditions (STC). This is also true if the system water temperature is raised to a higher temperature than the STC. It is therefore vital that an accurate heat loss calculation is carried out to ensure the sizing of the heat pump is correct.

Not surprisingly, if the air temperature is higher, or system water temperature is lower, an increase in output can occur.

8. How does air source heat pump water work in chilling area?

Heat pump equipment derived from the air conditioning industry is the result of many years of product development. Although they do work well, the technology tends to be over complicated for domestic heat pump applications and makes installation slow for heating engineers. Due to their design, this technology may require the assistance of a refrigeration technician for installation and commissioning.

Weather compensation is not a new idea for the heating sector. Detian has taken tried and tested technology and given customers the benefit of incorporating it into every air source heat pump.

As the COP of the heat pump is affected by weather conditions, it can sometimes result in poor performance and efficiency. Detian Low Ambient EVI Air Source Heat Pump Water Heater, this improves the performance of the system by increasing the heating capacity, air source heat pump can be working under -20DC ambient

9. How efficient is an air source heat pump compared with a gas or oil fired boiler?

Compared with gas/oil boilers in monetary terms is always going to be a moving target, as world prices for fossil fuels fluctuate. To get a reasonable indicator you have to establish how much energy is produced by, say a liter of fuel oil, along with the cost, and then compare it with the cost of a Kilowatt of electricity to run the heat pump and the pumps output. If the heat pump is more cost effective then the heat pump is more efficient. In environmental terms, the heat pump is vastly more beneficial as it is using solar energy contained within the ambient air to produce heat energy.

10. When the weather is cold will the air source heat pump still work?

For normal air source heat pump, when the weather is cold the ambient air contains less heat energy. At lower ambient temperatures the energy required to boil off the refrigerant, will require more input from the internal compressor. The water will be heated, but at a slower rate, so the efficiency of the heat pump reduces. Low temperatures of around -20oC will affect the heat pump performance in this way.

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