Nic Posted August 24 Share Posted August 24 Hi after some thoughts and opinions. building a small two en-suite two story house making it as passive as we can thermal raft airtight etc UFH likely to fit a Zehnder ComfoAir Q350 ( in first floor roof space… we are in Devon so the heating side of our property ( with the insulation, UFH, triple glazing etc) is not likely to be much of a problem 🤞🏼 my main thoughts are on cooling…. Space is limited, anyone know what the most effective way to go on this from the start? as I’d like to avoid having to retrofit something. I’m not likely to fit full blown air con unfortunately Link to comment Share on other sites More sharing options...
JohnMo Posted August 24 Share Posted August 24 UFH system and fan coils in bedrooms, run everything direct from the heat pump at a single flow temp - around 14 to 15 degs via a simple WC curve. 1 Link to comment Share on other sites More sharing options...
WisteriaMews Posted August 24 Share Posted August 24 We're planning a certified passive house and are looking to install a Zhender ComfoAir Q450 with the Zhender Comfoclime bolt on that does heating and cooling. Assuming we hit the passive house standard, that should be sufficient for us. I see you mention above UFH (and also have seen your other post about ASHP), if you get a heat pump that can reverse you could do both via the UFH; heat the slab in winter and cool it in summer. 1 Link to comment Share on other sites More sharing options...
MikeSharp01 Posted August 25 Share Posted August 25 8 hours ago, WisteriaMews said: We're planning a certified passive house and are looking to install a Zhender ComfoAir Q450 with the Zhender Comfoclime bolt on that does heating and cooling. Assuming we hit the passive house standard, that should be sufficient for us. Sounds like a plan the PHPP software will tell you if it's a goer! 1 Link to comment Share on other sites More sharing options...
WisteriaMews Posted August 25 Share Posted August 25 12 minutes ago, MikeSharp01 said: Sounds like a plan the PHPP software will tell you if it's a goer! PHPP tells us it's sufficient. Still feels like a bit of a leap of faith installing such a low power system. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted August 25 Share Posted August 25 27 minutes ago, WisteriaMews said: PHPP tells us it's sufficient. Still feels like a bit of a leap of faith installing such a low power system. Then it should be OK but check the technical guff on the unit to ensure it can deliver under your circumstances - I dimly recall you need to have a given output temperature for the unit to get the tick in the box and that's a variable. Link to comment Share on other sites More sharing options...
Nic Posted August 25 Author Share Posted August 25 9 hours ago, JohnMo said: UFH system and fan coils in bedrooms, run everything direct from the heat pump at a single flow temp - around 14 to 15 degs via a simple WC curve. WC curve ? Link to comment Share on other sites More sharing options...
JohnMo Posted August 25 Share Posted August 25 6 minutes ago, Nic said: WC curve ? Weather compensation curve 1 Link to comment Share on other sites More sharing options...
Dave Jones Posted August 25 Share Posted August 25 forget MVHR for cooling, we have the Q350 with the expensive heat/cool battery and its totally useless for cooling. The fancoils on the other hand amazing. Just insulate all the pipework to them and run a condensate drain to them. Link to comment Share on other sites More sharing options...
Dave Jones Posted August 25 Share Posted August 25 11 hours ago, JohnMo said: UFH system and fan coils in bedrooms, run everything direct from the heat pump at a single flow temp - around 14 to 15 degs via a simple WC curve. 14 is a bit cold ? 1 Link to comment Share on other sites More sharing options...
JohnMo Posted August 25 Share Posted August 25 27 minutes ago, Dave Jones said: 14 is a bit cold ? Work fine for us, but we do cycle on the heat pump (it's too big) so average is possibly closer to 16-18, depending on solar gain. 1 Link to comment Share on other sites More sharing options...
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