DIY Doctor

Main navigation

Radiator sizes

Postby georgio51 » Mon Oct 15, 2007 3:04 pm

Can any one please tell me how the sizing of radiator output is measured? Is there a standard temperature differential between water input temperature and room temperature that is used to give a normalised heat output? How else do you measure the amount of heat a radiator will put out? Anyone out there know the answers?
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Mon Oct 15, 2007 3:00 pm


Simply Build It

Postby The Heating Doctor » Fri Oct 19, 2007 8:34 pm

A radiator size for a room is calculated by performing a heat loss calculation. Each component that makes up that room, such as brick walls, plaster ceilings, timber floors, glass, wooden doors lose heat at differing rates i.e. there thermal conductivness expressed as a U value (w/m2) The area of each component is multiplied by the U value and the figres added together and mulitplied by the number of times you would expect the air volume to change every hour with in that room. Multiply that by the temp. differential, that is the anticipated worst average external temperature in the UK -1 deg C or -3 deg C depending what area of the UK you are in, and the required internal temperature required . This gives a total Watts output required to heat that room to cope with those conditions.
The Heating Doctor
Rank: Foreman
Progress to next rank:
Posts: 214
Joined: Mon Aug 27, 2007 9:49 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics