Chilled Beams v FCU v VAV
Chilled Beams v FCU v VAV
(OP)
I have just been speaking to a mechanical engineer in the UK and he has told me that VAV systems are no longer in vogue there. He told me that its all ceiling mounted fan coil units and chilled beams for commercial buildings. Can you believe it....?? and this is in London.
Personally speaking I think 4-pipe fan coil units are extreemly expensive not to mention difficult to maintain when it comes to filter changing and coil cleaning.
As for chilled beams all the manufactures data I have seen indicates very low cooling effect with chilled beams(w/m2) and would truggle to cope with internal zone air conditioning loads unless quite a lot are installed.
Anybody, anywhere particularrly UK readers anything to say??
Please dont tell me ye dont use VAV anymore.
Personally speaking I think 4-pipe fan coil units are extreemly expensive not to mention difficult to maintain when it comes to filter changing and coil cleaning.
As for chilled beams all the manufactures data I have seen indicates very low cooling effect with chilled beams(w/m2) and would truggle to cope with internal zone air conditioning loads unless quite a lot are installed.
Anybody, anywhere particularrly UK readers anything to say??
Please dont tell me ye dont use VAV anymore.





RE: Chilled Beams v FCU v VAV
RE: Chilled Beams v FCU v VAV
Jezzz, dont be given them new ideas mate!!! Im heading there in the new year, im going to have enough to content with, with their current practices.
RE: Chilled Beams v FCU v VAV
RE: Chilled Beams v FCU v VAV
Chilled beams and ceilings can be applied only in places with a mild climate like UK.The maximimum loading they can take is about 110 watt/sqm.As for FCUs,they are still in use in low end office buildings where the building owner tries to push maintenance issues to tenants.
RE: Chilled Beams v FCU v VAV
RE: Chilled Beams v FCU v VAV
There is no doubt that the VAV systems are the best solution for many commercial office applications, they are quiet, very low maintenance, good temperature control, good air distribution and very energy efficient.
There are various reasons VAV has fallen from popularity over the past few years, I think a major reason is the changing role of the consultant. Why should they spend weeks designing a complex VAV systems, with hundreds of meters of ducting and large AHU's, when they can send a schedule of fan coil units to a few manufactures and get them to select the correct unit?. The same principal is used to for the design of the chilled water and hot water piping systems.
The second major reason is cost. With the constant pressure to lower the cost of a new office development, the fan coil system offers a lower installation cost versus the VAV system. It seems the lower maintenance costs and running costs of the VAV system are not taken into account.
I know there are other reasons for this move away from VAV towards fan coil units, but these are my thoughts.....
Cooky.