Burning issue Sponsored by


chemi cals and t he water in the air . All ergic r eactions are also influ- enced by RH.


Time to take control ime to take control


In the UK, most humidity prob- lems in commer cial environments r esult fr


from t he RH being too low ,


so that a humidi fication system is requ ir ed to maintain good IAQ. As w ell as d esigning humidifi ca- tion i nto new bui ldings t here are also many existing buildings that would benefit fr om a retrofit ted humidification sys tem. But h ow best to go about it?


The most appr opriate choice of hum idifier w ill be deter mined by fiic to


a number of factors specif each bu ildin g and th ere are a number of accoun t.


cr iteria the to take in to


The first con sideration is h ow much moist ure will b e needed to achieve


r equired humidifi cation – and


then how of


level


best to intr oduce that moisture. The most common humidifi ca- tion s ystems heat water to gener- ate steam , which is


then intro-


duced to the vent ilation syst em. When steam humidifiers are the most appropriate sol ution for a particular pr oject the method o f heating needs to be selected care- fu lly


fiie to mini mise


sumption. water


Incr easingly, (adiabatic tems ener gy spraying th rough nozzles at


con- col d


hig h


press ur e so the wat er is atomised and quickly absorbed in to the air humidi fication),


is


being u sed as an energy-efficient alter native to steam. High pressure


adiabat ic also p roduce will o bviate the need fo o s uch a


al mechanical cool ing. For each 500 litres o f water that is evapo - rated


s yst em provide s ar ou nd 345kW of cooling for a sys- evaporative


cooling, which in some pro jects for additio n-


ning issue


As buildi ngs become more


As buildings become mor


air ti ght the need to contr


to control humidity in


humidity in support of g indoor air


quality AQ(IAQ it is no long


sup por t of good indoor air


quality (IA Q)


has increased ashas increased as it is no longer possible t o relly on a building’ natural


poss ible to r y on a building’s natur


‘leakiness’ to control


‘leakiness’ control


humidity humidity y..


power input of just 4k Whatever


k .W humidity contro l


techn ology is selected, the impor- tant thing is the r ecognition of t he key r ole that humidity plays in achievi ng and maintaining ther- mal comfort and good IAQ. The best sol utions can then be speci- fied,


fo humidity contr ol specialists.


ideally with support from The subject of th ermal comfort


is discussed in more detail in the white paper ‘Humidity and the Imp act on Human Comfort’, pu b- lis hed by the Humi dity Gr oup of the VA


HEVAC Association


• John Barker is th e sales director of Humidity Solution s


tight the need


Dail y news update at www.heatingandventilating.net


HVR | May 2016 | 11


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