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AIR CONDITIONING


VRF AHU system overview.


can use a heat (energy) recovery VRF system instead of a heat pump and recover the energy expelled or absorbed by each type of DX coil to be used elsewhere. For example, the energy that is absorbed by a coil used for dehumidification and therefore cooling the air, can be diverted and used in the coil that is providing the air reheat, or pre-heat, rather than expelling outside.


How can we maximise on the benefits? We r


e y y y , g g g


at the same time, result in higher system efficiencies. It is simply a case that a greater system capacity is produced with less relative energy consumed.


Expanding a single system to include multiple air handling units will compound the energy recovery potential. If we combine to include fan coil units, we extend the possibility of mixed operating modes across the system. Remember any ratio of mixed operating mode on a Heat


Controllability is also a key element of integrating VRF to other applications, in this case; AHU fan speed control, defrost signalling, error monitoring and air flow detection are all examples of direct integration. Supply air temperature, in addition to return air temperature control, puts on par to other devices any available modulation of the cooling or heating capacity of the DX coil. Modulation of evaporating or


, reducing temperature


overshooting or eliminates draughts, but also adds to the system efficiency gains. Further connectivity to a building management system allows comprehensive integration to a wider scope of other systems for complex control strategies. If we remember that air conditioning doesn’t have to stand alone when designing HVAC


systems, we can open up our potential of building efficiency through energy recovery. Quite simply, a heat pump will produce the effect of cooling and heating but the application and effect of this can be quite varied with just a little imagination and guidance.


Lordan ta Industrial Estate, dustrial Estate Hengo oed, CF82 7SS • 01443 812222


LORD AN


BEYOND THERMAL ENGINEERING


MADE IN BRITAIN 29 • stuart@lordan-uk.com


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