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Heat Pumps
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 int he ambient air is replenished by the sun.
There are two types of ASHP - 'air to air' and 'air to water'. Air to air heat pumps release the captured energy through an air heat exchanger, which is then forced (by fan) around the dwelling through trunking, or directly into the room. Most commercial buildings use this type of heating medium.
The Grant Aerona ASHP that we supply and install are the air to water type. Air to water heat pumps release the energy into a water circuit which is then used in a wet heating system (radiators or underfloor heating).
How an Air Source Heat Pump (ASHP) Works
Air to Water Technology
Air to water heat pumps employ the dynamics of the vapour/compression cycle
used for many years in the basic refrigeration process found within a domestic fridge.
A low pressure, low boiling point liquid (refrigerant) is exposed to a higher temperature in the coil of the evaporator. The liquid boils off to a gas and in doing so, absorbs energy. The refrigerant gas is then compressed to a higher pressure and temperature before passing through a heat exchanger where it gives its heat energy to water. The heated water is then delivered to a cylinder or heating system. After passing through the heat exchanger the refrigerant condenses back into a liquid before starting the process again.
Green Savings
Home Heating Comparison
Compared with other domestic heating methods, a Grant Aerone ASHP can benefit homeowners by creating annual savings on fuel bills, as it can deliver up to 5kW of energy for every 1kW used to run the unit. It also means that homes have a lower dependancy on fossil fuels, making them less susceptible to rising fuel costs.
Home heating in the UK additionally accounts for some 30% of CO2 emmissions. Grant Aerona ASHP can help reduce the amount of these harmful gases being released into the atmosphere, therefore lowering the homes carbon footprint.
Take a look at the bar charts below to see the comparisons for yourself:
The Grant Aerona ASHP Range
Introduction
Grant Aerona Air Source Heat Pumps include many innovative components, including the integration of a highly efficient weather compensating device with duel temperature control and a 3kW electrical heat backup (there is also an option to upgrade the electrical backup to 6kW). This arrangement allows the unit to perform more efficiently than some other heat pump designs, giving a reliable heat output, using less power, resulting in lower running costs. The design also allows for easy installation, into a new or existing S-plan type configuration. The controller comes pre-set, but can be adjusted as desired. The efficient Aerona air to water heat pumps are available as five 'single phase' units, with outputs ranging from 6.5kW-15.5kW.
Built In Weather Compensation Control
Grant has taken tried and tested technology and given customers the benefit of incorporating it into every Aerona ASHP.
As the COP of the heat pump is affected by air temperature and design load, it can sometimes result in poor performance and efficiency. The good news is that Grant's factory fitted weather compensating device enables Aerona heat pumps to accurately monitor both the inside and outside temperature conditions and allows it to precisely control its operation.
Grant has also pre-plumbed and pre-wired an independent heating element into the units which automatically operates and provides a boost in the rare times when the COP drops to inefficient levels.
It is also possible to incorporate and control a secondary heat source with this arrangement e.g. gas, oil-fired or biomass boiler (Bivalent System).
External Design
The Grant Aerona ASHP is very compact, sited externally, and requires no additional storage for fuel, therefore leaving more valuable room inside the home. The units come complete with a galvanised steel casing featuring a proven high quality external powder coated paint finish, which protects the internal components and case from weathering.
Sealed System Kits
Sealed system kits to suit all ASHP models are available. These kits come in two sizes for standard systmes and one larger size for use with Grant's Thermawave Thermal Store.
Air Source Heat Pump in the Home
Typical System Layout
The house below shows a Grant Aerona air to water heat pump incorporated into a standard heating system. This system is comprised of a heat pump, cylinder, underfloor heating and radiator circuit. Solar Thermal systems are a good match for air source heat pumps and when combined using a high efficiency heat pump cylinder, you can reduce home heating bills even further.
