Hello,
My husband and I are currently trying to decide which heating system to install in our planned house.
I insist on having a ventilation system and a wood-burning stove in the living room. So the heating should be compatible with these.
Our chosen construction company has now offered us three heat pumps:
Air-to-water heat pump: Nibe F2040-8 with Nibe VVM320
Exhaust air heat pump: Nibe F750 P with supply air module SAM 40
Ground source heat pump: Nibe 1245-6 with deep drilling
My husband currently prefers the exhaust air heat pump because he thinks it works like the air-to-water heat pump but makes better use of the warm air from running computers... Everywhere I read, though, it says: "Avoid exhaust air heat pumps unless you are building a passive house."
Does the supply air module actually make it function somewhat like an air-to-water heat pump, but with better use of the warm indoor air?
The house is planned as a two-story timber frame construction with KfW 55 standard. To be honest, I am completely overwhelmed by this complicated heating topic. The more information I get, the more complex it seems.
My husband and I are currently trying to decide which heating system to install in our planned house.
I insist on having a ventilation system and a wood-burning stove in the living room. So the heating should be compatible with these.
Our chosen construction company has now offered us three heat pumps:
Air-to-water heat pump: Nibe F2040-8 with Nibe VVM320
Exhaust air heat pump: Nibe F750 P with supply air module SAM 40
Ground source heat pump: Nibe 1245-6 with deep drilling
My husband currently prefers the exhaust air heat pump because he thinks it works like the air-to-water heat pump but makes better use of the warm air from running computers... Everywhere I read, though, it says: "Avoid exhaust air heat pumps unless you are building a passive house."
Does the supply air module actually make it function somewhat like an air-to-water heat pump, but with better use of the warm indoor air?
The house is planned as a two-story timber frame construction with KfW 55 standard. To be honest, I am completely overwhelmed by this complicated heating topic. The more information I get, the more complex it seems.
S
Sebastian7921 Aug 2016 10:23And once again, he is wrong – I understand that you are now doing this on purpose, but please stop with the talk.
KfW55 by itself doesn't really say much.
Architecture, individual needs regarding room temperatures, basement, heated area, domestic hot water demand – all of this is simply ignored.
By the way, I calculated for a KfW56 house... but what good is the value to you if it doesn’t fit your picture?
Is your house already built?
KfW55 by itself doesn't really say much.
Architecture, individual needs regarding room temperatures, basement, heated area, domestic hot water demand – all of this is simply ignored.
By the way, I calculated for a KfW56 house... but what good is the value to you if it doesn’t fit your picture?
Is your house already built?
You will have an energy performance certificate that shows your Ht value. This provides a good indication of how well your house is insulated (and it can also be used to calculate the heating load). By adding the number of occupants, you can also estimate the energy needed for heating domestic hot water quite accurately.
S
Sebastian7921 Aug 2016 11:00This is a factor in the heating load calculation – but what are you trying to tell me now?
I know how it works and what I have... by the way, you didn’t have those factors and still come to such conclusions right away.
Domestic hot water demand is, by the way, something individual – I rely on what we actually use, not what a standard wants to impose on me.
I know how it works and what I have... by the way, you didn’t have those factors and still come to such conclusions right away.
Domestic hot water demand is, by the way, something individual – I rely on what we actually use, not what a standard wants to impose on me.
And this also reflects a value that says something about the quality of your "building envelope / insulation" — so show me that if your insulation is supposedly that good. Otherwise, I still maintain that a ground loop collector can be installed on almost any plot of land for a properly insulated house.
S
Sebastian7921 Aug 2016 11:14My insulation exceeds the currently valid required standard and now has a U-value of 0.28. And no, you cannot reliably derive the heating load from this. Again: individual values affect the heating load – I have assumed higher room and hallway temperatures than the standard.
You will probably bring up your 0.21 U-value now, but that only proves that the KfW statement doesn’t mean much.
I maintain that you should keep such blanket statements to yourself.
You will probably bring up your 0.21 U-value now, but that only proves that the KfW statement doesn’t mean much.
I maintain that you should keep such blanket statements to yourself.
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