The most commonly asked questions about Air Source Heat Pumps IV

16. Is an air source heat pump suitable for an existing house as a replacement for a gas or oil fired boiler?

It is unlikely that an air source heat pump will be considered as a direct replacement for an existing boiler, unless the present system is considerably updated to ensure that the air source heat pump can sufficiently heat the property. This will include a full and detailed heat loss calculation, radiator replacement, cylinder replacement, as well as an assessment and possible upgrade of the properties insulation. However an air source heat pump can always be used as the main heating source, provided a back up system is also incorporated.

17. What are monovalent and bivalent systems, and which is best?

With a monovalent system, the heat pump is designed to provide all the required heat. Initial capital costs however, may mean it is more economical to use a bivalent system where the heat pump only covers the base heating load. An additional heat source e.g. oil boiler, gas boiler, or electric back up, will meet the remaining peak demand. Which system to choose, purely depends on the home and heating requirements.

18. What type of controls should I use?

It is perceived that the ideal heating arrangement for ASHP installation is a well designed under floor heating system that uses low temperature water as its heating medium. The controls for the system will be as specified by the underfloor heating manufacturer. A temperature sensor on the heating system, will control the running of the water circulating pump in the air source heat pump, to achieve the required target temperature. If the heat pump is to also be used as a supplement for domestic hot water, via an indirect cylinder, then a traditional 'S-plan' type arrangement can be used.

19. How easy is a Detian air source heat pump to install? Air source heat pump is supplied fitted with the weather compensation unit and electrical backup. Only two pipe connections are required from the house: heating system flow and return, and an electrical supply. The heat pump itself should be placed at least 300mm from the wall to ensure that there is an unobstructed air flow to the unit.The electrical supply should be fed from a dedicated MCB with a suitable external isolation switch, situated near the heat pump.

20. What cable size should be used to connect the air source heat pump to the mains supply?

Cable size will vary dependent upon the size of heat pump installed, type of cable and its length of run. We recommend that all electrical work is carried out by a registered and qualified electrician, in accordance with current legislation.

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The most commonly asked questions about Air Source Heat Pumps III

air source heat pump water heater

11. Can an air source heat pump meet all the heating and hot water needs for a house throughout the year?

Under anything but the most severe weather conditions, provided the property is well insulated and the unit has been sized correctly, the heat pump will supply the necessary heating requirements for the majority of the year. However, in any situation where the weather can be severe, a supplementary heat source will be required to maintain target temperature. This would normally be provided by a backup immersion, but could also be in the form of a supplementary gas/oil boiler.

An air source heat pump works at a higher COP when run at lower flow temperatures, typically 35-50^oC. Domestic hot water is normally stored around temperatures of 60^oC, so it is therefore likely that a supplementary heat source in the form of a tank immersion element may be required, especially if the heat pump is the only provider of domestic hot water and is not being assisted by solar thermal.

12. What water temperature will the air source heat pump generate?

Even at a temperature as low as -15^oC, air contains a certain amount of heat. In the United Kingdom it is rare that our external air temperature would fall below this point, meaning air source heat pump technology can be a very effective heating method. In traditional terms an air source heat pump produces low temperature water, in comparison to traditional heating appliances. This is due to the following:

1) The physical properties of the refrigerants used are limited to the amount of energy that they can absorb and therefore give up, further into the process.

2) httphttp://www.fsdetn.com/The ambient air contains insufficient heat energy to successfully boil off

the refrigerant vapour.

Refrigerants used throughout the industry can comfortably produce water temperatures in the region of 50^oC based on current independent testing criteria.

13. Can I connect an air source heat pump to my existing hot water cylinder?

Due to the lower water temperatures produced by a heat pump, any heat exchange taking place in an indirect cylinder will require a coil with a larger surface area compared with that of a traditional cylinder. This will ensure efficient heat transfer. Therefore it is recommended that the cylinder be checked for suitability and changed for one designed for use with heat pumps. Grant produce a range of ASHP cylinders, specifically for this application.

14. I am aware that an air source heat pump works well with under floor heating but can it also work with radiators?

A heat pump will cope well when used with panel radiators, provided that the system is properly designed and that the building has a high level of insulation. Due to the lower temperatures involved, radiators have to be over-sized and the heating will need to be on for longer periods, in order to meet the heating demand. Customer perceptions may be different as the radiators will be cooler to touch, giving the impression that the heating is not functioning correctly, even though room temperature targets are being met. Radiator and underfloor heating systems can also be combined.

15. Can I heat a swimming pool with an air source heat pump?

Yes, an air source heat pump can be used to heat a swimming pool provided the system is correctly designed and the heat loss is calculated. The system design must ensure that the swimming pool water does not come into direct contact with the heat pump components.

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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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Air source heat pump water heater: The most commonly asked questions about Air Source...

Air source heat pump water heater: The most commonly asked questions about Air Source...: 1. What are air source heat pumps (ASHP)? A. Air Source Heat Pumps use basic thermodynamic principles to convert latent/sensible heat (...

The most commonly asked questions about Air Source Heat Pumps

1. What are air source heat pumps (ASHP)?

A. Air Source Heat Pumps use basic thermodynamic principles to convert latent/sensible heat (contained within the ambient air) into heat energy that can be used to provide heating and hot water. In this respect the device can be classified as a renewable energy source because the heat in the ambient air is replenished by the sun.

2. How do air source heat pumps work?

Take refrigerant as the medium, the refrigerant can be vaporized at -40℃low temperature. Therefore, there is temperature difference with outside air. refrigerant absorbs the temperature from outside air, compressed by compressor heating, turn into the high temperature high-pressure gas, exchange heat via the heat exchanger with water, to release pressure via the expansion valve , back to the low-temperature low-pressure liquefied state, through a continuous cycle of refrigerant.

3. What is different about Detian air source heat pumps?
A. Air source heat pumps generally fall into three categories:
1) Units that have been designed specifically for heating only.
2) Units that were originally designed for air conditioning (cooling), but have been modified to provide heating.
3) Units that were originally designed for both cooling and heating with cooling the main function.
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Detian air source heat pumps falls into all the three categories, having been designed specifically for heating homes. The unit is available in five sizes ranging from 6.5kW-15.5kW.

4. Does heat pump products need electricity?
There must be electricity used for compressor and fan normal working.
Air source heat pump water heater's characteristics.
1) without environmental impact, available all year round;
2) the energy saving effect is prominent, and the payback period is short;
3) 3environmentally friendly products, without any pollution;
4) longevity, low operating costs;
5) Run safe, unattended operation;
6) the modular design, easy to install.

5. The advantages of heat pump water heaters compared with the boiler?
High thermal efficiency: air source heat pump water heater thermal
1)efficiency more than 300% for annual average, while the thermal efficiency of the boiler does not exceed 100%.2, low operating costs: compared with oil, gas boiler, 70% of the energy for annual average, and increasing fuel prices.
2) low running costs have become increasingly prominent.
3) No combustion emissions, environmental protection.
4) Unattended safe operation: compared to fuel boilers, running absolutely safe, and automatic control, no staff on duty may be savings staff costs.
5) Module installation, easy to add devices, multiple units installation in parallel mode, when the water consumption increases, add equipment at any time.

6. What are the disadvantages of the heat pump water heater compared with the boiler?
1) More time to heat: air source heat pump take the refrigerant as the medium, the use of compressor compression heating, compared with the boiler direct heating mode, the speed is relatively slow.
2)  One-time investment: compared with fuel, gas boiler, when water consumption is greater than 10 tons, one-time investment is greater than the boiler, the more water needed, the more costs to invest.
3) Heating water temperature is limited to: heat pump water temperature at 60 ° C (water source heat pump up to 80 ° C), air source heat pump water heater could not produce more than 80 ℃ high temperature water or steam.

More information please visit our website: 1. What are air source heat pumps

How to get the right air source heat pump?

Air source heat pump is good investment especially for people who live in warm areas. This is one gadget that save your time for warming water to take bath. This kind of a heater uses eletricity in order to get hot water. It extract energy from the ambient air and then compresses it into hight teperature hight press gas, then transfer and transport the heat to the cold water, exchange heat via heat exchange. This is a good way of saving energy in you house. In order to get the right model of air source heat pump for your house, there are thing you need to consider before you buy.

The first thing you need to consider is your location. It is necessary to consider if your house location is cold or not. You must know what extreme temperature your area get. This point will decide what water heater you need to buy. Air source heat pumps suitable temperature range: -10℃-43℃.

Another thing to consider when you want to buy air source heat pump is the costs. When you go to buy air source heat pump, it is good to be keen so that you get a air source heat pump suit your family needs and budget. Take your tiem to compare and get quality devide, to ensure you get an appliance that within your budget.

Another thing you should consider is doing research when decide to buy air source heat pump. This research will be a good way of having enough information on the air source heat pump you want to buy. By doing research, you will be able to get a good high-quality appliance.

You will know all the kinds air source heat pump after doing research on the market, take your time to pick the best one. Make use of the reviews so that you will know the best. Make reference to the comments from air source heat pump’s user. Get to know the merits and demerits of the air source heat pump which you want to buy. So you are fully aware of what you are going to buy.

Safety is another thing you need to keep in mind you are in the marekt to buy a air source heat pump. To buy an appliance that has safety features. For most air source heat pumps, it is more safer than other water heater, so you just need to pick one which meet your household need.

Another thing you should consider is about energy saving, the one will reduce you bill cost, just like mentioned above, costs is first thing you should consider, but operating cost is more important than it. A excellent air source heat pump will help you payback your buying costs asap. For example, the sum of electricity saving of using air source heat pump for years, ususally, househould air source heat pump will pay back costs need more time than business hould air source heat pump. Some business air source heat pump will pay back in several months.

So spend a little more time to choose your air source heat pump, there is no more trouble at all.

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Swimming Pool heat Pump

The major concerns is running costs for most family who want to buy swimming pool heat pump.

The latest generation of swimming pool heat pumps actually extract the free heat from the air; the sun doesn't need to shine for the heat pump to work!

Today's swimming pool heat pumps can extract free heat from the outside air, even when the external temperature is as low as -15℃. However the standard outdoor pool unit will only need to defrost. So how does a heat pump work? In one word, a heat pump is a refrigerator working in reverse, so the technology is proven and they are noted for their reliability.

In different operation conditions, Swimming Pool heat Pump can absorbs 3 to 6 kilowatt hour heat from low temperature heat source when it consumes 1 kilowatt hour electric energy. Swimming Pool heat Pump is usually made up of compressor, evaporator, expansion valve, filter, fluid reservoir, condenser, water tank, and water pump, etc.

The pool owner doesn't want the trouble of constantly monitoring the heating of his pool so most heat pumps are fully automatic and need but one control ­the pool water thermostat!
Heat Pumps are super efficient with COP (co-efficiency of performance) of up to 5:1, this means you put in one dollar in electricity and the Heat Pump gives you five dollar worth of heat to the pool.

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