|
|
Post by endfeed on Mar 1, 2022 21:01:59 GMT
What's your favorite app for rad sizing? Or rule of thumb???
|
|
|
|
Post by crowsfoot on Mar 2, 2022 7:31:47 GMT
It used to be that mires calculator wheel thing then around....20 years ago (gulp) it had changed to something called the whole house method (I've some info on it somewhere). There's an app for it now?  Seriously, there is a Baxi Tool belt app that's on my work i-pad which as some sort of rad sizing part to it. |
|
|
|
Post by dickpuller on Mar 2, 2022 8:01:49 GMT
What's your favorite app for rad sizing? Or rule of thumb??? You need to do a Heat Loss calculation to ascertain the heat required for each room. Then size your radiator accordingly. The radiator output will been stated at roughly a 50dec Delta T - so for a 20degree room the radiator needs a mean water temperature of around 70. Heat Pumps & shit only run at around 40degrees. |
|
|
|
Post by tomplum on Mar 2, 2022 8:53:54 GMT
There is, 'toms rule of window guide' measure the width of the window, use double panels down stairs and single panel upstairs, This is not as rough as you might think because, The windows are calculated to let as much light in as possible, Of course there are exceptions, like those big daft narrow and high windows so you have to use your 'noggin' about it but, it works 90% of the time,  |
|
|
|
Post by dickpuller on Mar 2, 2022 10:31:36 GMT
Heat Loss calculations are not difficult & there’s some great Apps. ‘Heat Engineer’ is good👍👍
Tom’s method is good? See, big radiators can heat an area at a lower temperature, so a reduced Flow temperature means a Condensing boiler will condense more & be more economical.
Say you price a full Heating job at £4K. If you spend 1/2hr designing it, heat loss etc, you’ll make more money!!
The classic mistake; not taking the water flow rate & fitting a 35KW combi. A piss poor flow rate & you could fit a 24!!
|
|
|
|
Post by cylinderfella on Mar 3, 2022 21:39:32 GMT
|
|
|
|
Post by dickpuller on Mar 4, 2022 6:45:23 GMT
Worryingly, it does not ask about Room Air Changes or adjacent rooms & the temperatures. Also, it didn’t ask about type of boiler etc. If it were a Heat Pump for example it would be farting at thunder!!! I used a hypothetical room on this & my regular HL calculator - this was 50% lower!!🙁🙁🙁 Chaps, don’t attempt to size radiators by a rough Rule of a Thumb, it’ll back & bite you on the bum!! There’s plenty tutorials on YouTube etc, teach yourself about Heat Loss & system design. |
|
