VENTILATION HEAT RECOVERY WITH COOLING


Heat recovery using NVHRC An air-to-liquid tube heat exchanger is placed in the air outlet within a room. The heat exchanger has a very low pressure drop on the air side – <5Pa at maximum air flow – due to the special design of the tubes. An axial fan provides backup when the natural driving pressure is insufficient. A fluid with a temperature of 5C to 10C


circulates through the tubes of the heat exchanger and cools the outlet air. The fluid is connected to a heat pump, which cools down the fluid and transfers the heat to the building’s heating system – from where it is distributed to provide space heating, domestic hot water and preheating of the inlet. The potential heat recovery from the


discharge air and the requirement for heat in the room or building, may not always match. On especially cold days, when the


HEATING COOLING


Air outlet


Air inlet – window and/or preheating/ cooling unit


Circulating fluid Heat pump Heat storage Hot water tank Cold storage tank


H HST CST


HP Figure 1: An example of heat recovery with NVHRC


HEAT RECOVERY VENTILATION


Air Conditioning / Heat Pump Specialists Celebrating 30 years as a Daikin Distributor Space Airconditioning plc supports the entire range of energy effi cient Daikin solutions.


Chillers, Split, VRV, Rooftops, R22 replacement, Spare parts and more! Call: 01483 504 883 www.cibsejournal.com NOBODY KNOWS DAIKIN BETTER www.spaceair.co.uk July 2011 CIBSE Journal 43


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