Energy-Saving Equipment 25 Nothing beats HP
Dene Kent, managing director of Fläkt Woods Air Climate Solutions, looks at the latest technology that optimises efficiencies in air handling units.
MANUFACTURERS OF commercial ventilation systems have always looked to optimise energy efficiencies, especially where air climate systems are concerned. If specified incorrectly, these can be one of the most energy hungry components of a building, so ensuring the products installed are designed to minimise running costs is of the upmost importance. Currently, there is one type of air climate technology in particular that is making a resurgence: heat pumps.
They have been around for many years but, until recently, have not been optimised within a ventilation system. Yet manufacturers are now combining a reversible heat pump with a recovery wheel as an integral component of air handling units – a seemingly simple arrangement that can provide a wealth of benefits. One of the key features of an integrated heat pump unit of this type is that it works as part of a ‘packaged product’. So there is no refrigeration out-work
and, due to low levels of refrigerant, it removes the obligation for facility managers to carry out regular leakage checks in compliance with the Building Regulations.
When it comes to energy efficiency, the advantage of integrating a reversible heat pump (HP) unit with an energy recovery wheel is twofold.
In HP mode, the unit is either pre- heating air (to help reduce the mechanical heating load), or pre-cooling air on the condensing side to further improve energy efficiency.
Plus, in general, the cross-sectional area of the condensing coil in integrated units is larger than external versions, allowing it to dissipate more heat and return improved efficiencies.
An additional feature is the level of energy recovery attainable from the integral thermal wheel. This maximises energy recovery all year round to further reduce energy usage.
And units that utilise DC inverter scroll compressors, such as the Recooler HP from Fläkt Woods, can not only achieve COPs up to 6.5, but also allow full control of outputs from 10% to 100%. Consequently, a unit can deliver the exact temperature required and maintain occupants’ comfort levels more effectively than traditional fixed speed systems. So, for building services engineers specifying ventilation systems, it is worth considering some of the latest air climate technology available.
It could save space and installation costs, plus improve the overall energy efficiency of the building.
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ACR News January 2014
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