GUIDE TO AIR SOURCE HEAT PUMPS - Grant UK

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Q. How noisy is an ASHP?A. Heat pumps incorporate a fan and compressor that will generate a degree of background noise under normaloperation. As it is generally accepted that ASHP’s are located near to the property’s exterior walls for ease of pipe andpower cable runs, it is important that consideration is given to the amount of noise generated. Noise is measured indecibels or dB(A) and gives an indication of sound pressure level, usually measured at a distance of one meter. GrantAerona ASHP produce around 52-58 dB(A) across the range.Acoustic considerations:Source of sound: dB: Perception:Silence 0 InaudibleWatch ticking 10 Very quietAir con in office 40 QuietConversation 60 MediumMotorcycle 70 LoudHGV 90 Very loudAirplane 130 UnbearableQ. Why fit an air source heat pump (ASHP) in preference to a ground sourceheat pump (GSHP)?A. The choice between the two could be down to the following:1) The difference in COP between ASHP and GSHP is minimal compared with the difference in cost of the equipment andinstallation.2) The installation of a GSHP may cause considerable disruption to the property and could require the services ofspecialist consultants and installers. In comparison, the installation of an ASHP is far easier to plan and carry out.3) For GSHP, the suitability of the property is a major factor, as they require either sufficient ground surface area, or asuitable local geology. No such considerations apply to ASHP.10
Q. What refrigerant is used in a Grant Aerona ASHP?A. The refrigerant used is R407 c, which is a Hydroflurocarbon (HFC) blend with a boiling point of –44 o C. An HFCrefrigerant is Ozone friendly. However, it should be remembered that the discharge of refrigerant is forbidden underEuropean and UK Law.Q. Can an ASHP be combined with other renewable technologies to provide amore energy efficient home?A. Absolutely, as long as a thermal store or a suitable cylinder is used in the initial design, then other technologies can beincorporated to make the whole system as efficient as possible. The technology that is most beneficial to incorporate insuch a system would be solar thermal.Q. What maintenance is required for a Grant Aerona ASHP and how often will itneed to be serviced?A. No intrusive servicing is required or indeed allowed under legislation unless undertaken by a qualified refrigerationengineer. The servicing routine is annual and limited to ensuring that the evaporator coil/matrix is clear of debris, which willsignificantly affect the performance of the heat pump if allowed to build up.T: 01380 736920 W: WWW.GRANTUK.COM
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GUIDE TO AIR SOURCE HEAT PUMPS - Grant UK

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