An ASHP uses a fan to draw latent environmental energy through an externally sited heat pump or through ductwork to a heat pump sited within a structure.
The latent environmental energy from the air passes across a heat exchanger incorporated within the heat pump. The latent heat is extracted and and increased in to a much higher temperature. This high temperature is then utilised within the heating and hot water system. An ASHP can still extract heat when air temperatures are as low as -15°C and still retain an efficient ratio.
The system design for an ASHP is as essential as all technologies. To deliver efficiencies and affordable running costs.
As the external air temp falls the ASHP will have less heat generating capabilities. It is essential to design the system and product selection with low external temperatures in mind to prevent cold households or the need to use of additional heat sources. (ie extremely expensive to use “back up immersion heaters”).
With the correct system design a short fall in heat generation will never happen.
