Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 18 minutes ago, SteamyTea said: Must have misread it, though it was a max heat load of 7.9 kW. Ah, add water. is it water or is it you dont get a 7.9kw heat pump? so they have said 10kw?
SteamyTea Posted February 9, 2022 Posted February 9, 2022 43 minutes ago, Mike_scotland said: is it water or is it you dont get a 7.9kw heat pump? so they have said 10kw? I forgot about the water, so a 10 kW seems about right. would still get someone to do a proper room by room heat loss calculation. You can download the MCS spreadsheet and have a go at it yourself. On this page under Heat Pumps https://mcscertified.com/standards-tools-library/
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 4 minutes ago, SteamyTea said: I forgot about the water, so a 10 kW seems about right. would still get someone to do a proper room by room heat loss calculation. You can download the MCS spreadsheet and have a go at it yourself. On this page under Heat Pumps https://mcscertified.com/standards-tools-library/ Thanks mate, i was on the phone to Grant this morning they said with a Heat loss(carried out roughly by Valliant) at 7.9 at -3.4 there 10kw unit would just about suffice as at -3 degrees there 10kw unit at 50 degrees flow rate puffs out 8.5kw heat outout. but they have said a proper heat loss needs to be carried out as valliant could of just been rough they dont know.
JohnMo Posted February 9, 2022 Posted February 9, 2022 21 minutes ago, Mike_scotland said: Thanks mate, i was on the phone to Grant this morning they said with a Heat loss(carried out roughly by Valliant) at 7.9 at -3.4 there 10kw unit would just about suffice as at -3 degrees there 10kw unit at 50 degrees flow rate puffs out 8.5kw heat outout. but they have said a proper heat loss needs to be carried out as valliant could of just been rough they dont know. Have you done a heat loss calc, using the spreadsheet on buildhub? If you do you will know what you heat losses are. You can then tell them they are wrong or right. Because you seem to be round in circles.
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 1 minute ago, JohnMo said: Have you done a heat loss calc, using the spreadsheet on buildhub? If you do you will know what you heat losses are. You can then tell them they are wrong or right. Because you seem to be round in circles. can you send the heat loss calc?
JohnMo Posted February 9, 2022 Posted February 9, 2022 https://forum.buildhub.org.uk/topic/439-fabric-and-ventilation-heat-loss-calculator/?tab=comments#comment-4407
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 5 minutes ago, JohnMo said: https://forum.buildhub.org.uk/topic/439-fabric-and-ventilation-heat-loss-calculator/?tab=comments#comment-4407 Thanks, that looks pretty hard to fill out to be fair
SteamyTea Posted February 9, 2022 Posted February 9, 2022 1 minute ago, Mike_scotland said: Thanks, that looks pretty hard to fill out to be fair Fill out what you can, then loo up what you can't, then ask when you get properly stuck. Most of it is fairly obvious.
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 Just now, SteamyTea said: Fill out what you can, then loo up what you can't, then ask when you get properly stuck. Most of it is fairly obvious. internal walls? like all the walls added together or just the walls that touch outside
SteamyTea Posted February 9, 2022 Posted February 9, 2022 2 minutes ago, Mike_scotland said: internal walls? like all the walls added together or just the walls that touch outside Walls that do not touch the outside. I have never filled it in, may have a look later and see what terminology is used.
markc Posted February 9, 2022 Posted February 9, 2022 Internal walls connected to the outer skin would need to be included in heat loss, but internal walls on an internal skin are not a thermal bridge
SteamyTea Posted February 9, 2022 Posted February 9, 2022 6 minutes ago, Mike_scotland said: internal walls? Looks like Internal Wall Area. So the external walls, but measured on the inside. Ignore that I posted above. 1
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 19 minutes ago, markc said: Internal walls connected to the outer skin would need to be included in heat loss, but internal walls on an internal skin are not a thermal bridge Air changes per hour ?? is this the air tightness test?
markc Posted February 9, 2022 Posted February 9, 2022 (edited) 1 hour ago, Mike_scotland said: Air changes per hour ?? is this the air tightness test? No, air changes per hour is the number of complete complete air changes in the property or room… if volume of building is 100 cubic metres and 2 changes per hour required, then ventilation system needs to be 200 cube per hour minimum. or you need to heat/cool 200 cube per hour to maintain temp Edited February 9, 2022 by markc
Mike_scotland Posted February 9, 2022 Author Posted February 9, 2022 30 minutes ago, markc said: No, air changes per hour is the number of complete complete air changes in the property or room… if volume of building is 100 cubic metres and 2 changes per hour required, then ventilation system needs to be 200 cube per hour minimum. or you need to heat/cool 200 cube per hour to maintain temp how do i find that out?
markc Posted February 9, 2022 Posted February 9, 2022 1 hour ago, Mike_scotland said: how do i find that out? This gives you some suggested values. https://www.vent-axia.com/sites/default/files/Ventilation Design Guidelines 2.pdf volume of property is found by multiplying floor area by height to give cubic metres air. multiply this by air changes per hour ACH 1
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