marshian

So now I need to understand why the result (if I am reading it right) at 12 kWh is 3 times my current heat loss 🙂 Current heat loss is just under 4.0 kWh at -2.5 Deg C So I've definately made an error somewhere

U Values used

OK Finished Two Warnings I think I understand both are due to the internal nature of the Hall and Landing being centre of house so no external wall ticked

One question - might seem a bit stupid In a two storey house Ground Floor gets the downstairs floor does it get the ceiling as well or does the upstairs floor get the ground floor ceiling as it's floor and the ceiling between it and the roof structure? At the moment ground floor has ground floor and ceiling, first floor has floor and ceiling - concerned that this may be double counting?

Ref phone comment - yes it works but it's not optimised for the small view (may not help my phone is set for larger text view) - it's possible just not as easy as PC or Tablet

Windows Just about to try it on android tablet (but I let the battery get flat so it needs a charge first)

Glad I checked - will have to get my head around that.

66.2 m2 floor area (this includes the internal brick walls) 32.6 m External Walls So 0.67?

Using firefox

One small bug I have found - when entering Rads everything works fine till you get to the l/m - it will only let you enter whole numbers (not number to two dec places) but once a whole number is entered you can increase or decrease it in steps of 0.01 - easily worked round but a little slow to get to the right value

Perfect sense - I'd like to sense check the result with you if I may?

Next Question Flooring area P/A specifically House is a stupid T shape (I have mentioned this in threads before) it was L shaped originally but we added an extension to the rear of the house in 2006 Do I treat the floor area as two rectangles or work out the floor area and enter it as a "square" size that meets the area?

Ahh good to know - I tried various methods and none seemed to work (As a registered user) OK I get you but for me heat emitters are all about surface area (especially at low flow temps), flow rate and volume of water Take my 1800 x 578 vertical it has a volume of water of 10 Litres 10 litres divided by 0.578m width = 17.3 l/m 10 litres divided by 1.8 height = 5.5 l/m Compare that to my K33 1400 x 700 with a capacity of 14 Litres 14 litres divided by 1.4 = 10 l/m 14 litres divided by 0.7 = 20 l/m OK now I bloody get it - ignore me I'm stupid - it's basically looking at how much volume you have per m as a factor and you need to always use the width................... You've clearly put a lot of effort into it - it seems quite polished already - I do like the "not to current regs" pointers (I've got an 80's house - extended in naughties so stand no chance of being to current regs but I've improved it where I can

email sent - to be honest adding rads has been my biggest issue - doesn't seem to want to save them! I know all my rads are pretty much spot on size wise for flow temps I'm using and house heat loss - I've made all the mistakes and learnt from it - I'll use two column So even with a vertical rad that is 1800 mm high you divide the volume by the width? I get that for a panel rad it would work that way but thanks - good learning point Ahh this makes sense now - thank you I'll do that next time I'm back at it That was my approach after I screwed up the first room and didn't know which external wall I was adding a window too As I said - I like it and I haven't broke it yet which is what I'm normally paid to do

OK few questions Rads Adding radiators to the database - is that to a central database so others can look up or just for the project in question What would I select as type for a 1800 x 578 double flat tube vertical rad I know the kW rating at T50 I know the volume of the rad (because I measured it on a drain down - call me sad if you like) but how would I calculate the litres/metre U-value (W/m²·K) I know the U-value for my external walls Brick 102mm Mineral wool in cavity 50 mm 100mm std aerated block 13mm plaster is 0.45 (well that's the closest approximation to what I have) So on external walls I should select a U Value of 0.45 but I can't seem to change it from the default 0.10 am I muddling my units?

I was planning on trying "hosted version" on Android Tablet, iphone, Windows 11 Laptop (Firefox or Edge) Installed locally on stand alone Windows 8.1 Desktop (windows doesn't have internet access) and on the same PC running Linux as web based access either as installed locally or hosted

One quick question - what platforms does it work with - ie phone as an app or windows PC with browser?

My boiler doesn’t have control of the pump and I run a fixed flow rate (constant curve) so the only time TRV heads intervene is in rooms with a lot of solar gain - most of the heating season I don’t get any solar gain so the system is getting a constant flow all the time. Appreciate the point being made to clarify my simplistic response

You could say that!!!

Pressure Independant TRV - adjustable for flow rate which doesn't change even if circuit pressure increases Danfoss RAS B2 are what I am using

@Spinny The other thing that can be worthwhile is to get a thermal camera and take pictures of the rads This is a K33 1400 x 700 Fed BBOE with low flow temps This is a tall vertical (fitted with one of the diverters mentioned earlier in the thread)

Exactly why I now have Danfoss ones on all the rads Verticals especially really large ones even with Flow Diverters aren't great heat emitters at lower flow temps - they do get closer to the claimed outputs as the temps get higher but in the 26 to 35 deg flow temp range they need a lot more flow than a conventional panel rad I have connected one of my tall rads TBOE and it's performance is much improved (but as you say it doesn't look that pretty) I got the feeling @Spinny wasn't talking about tall column rads but more the old fashioned cast iron style column rads (probably better to call them period correct)

The internet will guide you - there are also "Alipress knock offs" out there but I can't vouch for their effectiveness

You need to make a feeding station - get them nice an comfortable with it - then they make easy targets for an air rifle Oh and you are shooting them because they are eating all your crops

Just a word of warning on the diverters above - if you are running TRV's on the majority of the rads when TRV's shut down it is possible to invert the diverters above - no need to ask me how I know this!!!