Air Source Heat Pumps

Air source heat pumps use the refrigeration process to transfer low grade energy from the air outside into high grade energy used for heating and domestic hot water. Even at temperatures as low as -20%u02DAC, an air source heat pump can supply significantly more energy than it uses – and with no local C02 emissions, it helps reduce impact on the environment.

A scroll compressor is used to compress refrigerant within the unit to increase both its temperature and pressure.

The refrigerant then passes through a condenser where energy is transferred to the heating system water and the refrigerant is turned from a high pressure vapour into a high pressure liquid.

The liquid refrigerant then passes through an expansion valve that lowers its pressure and temperature.

With the refrigerant evaporating and at a very low temperature it passes through a heat exchanger. At this stage the refrigerant collects large amounts of low grade energy from the air, causing it to boil and return to a vapour form.

This continuous cycle of changing the state of the refrigerant from liquid to vapour allows the heat pump to extract the maximum energy from the air.

Cylinder options

Percy Brown Ltd can supply a cylinder to suit every system. We supply a range that is manufactured and approved to the relevant British and European standards and fully guaranteed for 25 years.

Cylinders for boiler systems: Percy Brown Ltd supply and install integrated thermal store cylinders which will reduce heating bills by up to 15%, improve energy efficiency, provide a faster performing, more responsive underfloor heating system and supply domestic hot water at mains pressure. Manufactured from stainless steel with CFC-free insulation and full WRAS approval. Available in 210 and 300 litre volumes.

 Cylinders for heat pump systems: Percy Brown Ltd supply and install a complete range of unvented cylinders, designed and developed specifically to work in conjunction with heat pumps. Features include: a high-efficiency coil specifically designed for heat pump operation; stainless steel construction with CFC-free insulation and white plastisol finish; 3kW immersion heater; connections for optional secondary hot water pump for instant hot water and a solar coil option; full WRAS approval.

Buffer vessels: To boost heat pump efficiency we also supply and install a 100-litre floor-standing buffer tank with a steel construction and white powder-coated casing that can sit beneath a cylinder where sufficient height is available. The buffer tank has a 2-year manufacturer’s warranty.