ᐅ Using a geothermal basket to precondition the air for a mechanical ventilation with heat recovery system?
Created on: 22 Aug 2022 18:14
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Nixwill2
Hello everyone,
From the beginning, I’ve been thinking about how to keep the temperature at a comfortable level (24° to 25°C (75°F to 77°F)) in our new house during the summer. We will have underfloor heating with a heat pump and cooling function. At least, we want to have air conditioning provisioned.
Since we will have a mechanical ventilation system with heat recovery, I’m also wondering if it’s really ideal to have warm outdoor air blown into the house.
Today, by pure chance, I came across something called a ground heat exchanger.
Does anyone have any experience with whether this is effective for pre-cooling the air? Of course, it should also have the positive effect of pre-warming the air in winter.
It doesn’t seem very complex and is supposedly relatively uncomplicated even in a water protection area.
I have no knowledge about heating or anything like that, so I’m just asking openly…
Best regards,
Nixwill2
From the beginning, I’ve been thinking about how to keep the temperature at a comfortable level (24° to 25°C (75°F to 77°F)) in our new house during the summer. We will have underfloor heating with a heat pump and cooling function. At least, we want to have air conditioning provisioned.
Since we will have a mechanical ventilation system with heat recovery, I’m also wondering if it’s really ideal to have warm outdoor air blown into the house.
Today, by pure chance, I came across something called a ground heat exchanger.
Does anyone have any experience with whether this is effective for pre-cooling the air? Of course, it should also have the positive effect of pre-warming the air in winter.
It doesn’t seem very complex and is supposedly relatively uncomplicated even in a water protection area.
I have no knowledge about heating or anything like that, so I’m just asking openly…
Best regards,
Nixwill2
KingJulien23 Aug 2022 14:42With "DaHias," I don't even need a profile to know he's from Bavaria :p
@Nixwill2
As already suspected here 😉 we live near Augsburg. Our house was built by a carpentry company located in our village.
Sorry if my post was a bit unclear.
First and foremost: by ventilation I also mean cross-ventilation at night (this wasn’t clear in my post, sorry)! So in the evening, when it’s cooler, we open the windows, sometimes all night upstairs, in the children’s rooms, and downstairs we close them again when we go to bed. In the morning, my wife opens them again at 6:00 (or I do it in the children’s rooms when they are awake).
We live in a rural area, not in the city, so it cools down quite well at night and traffic noise isn’t an issue.
I actually wanted to write "put aside." We have ventilation and a heat pump from Viessmann, which could provide passive cooling with the so-called "NC box." However, we don’t have it yet, and it slipped down the priority list.
With the controlled residential ventilation, I can set a ventilation schedule for each weekday via the Viessmann app. At the beginning of summer, I set it as described above; in autumn I change it again (a lot during the day, less at night). In the long term, I want to see if I can make this "smarter" with Node-red.
Upstairs is shaded with roller shutters, downstairs with venetian blinds, all controlled via KNX. We have no skylights.
The open-plan living and dining area is open to the kitchen, so it is always about 1-2 degrees higher than the rest of the house. For example, today: basement 20.5°C (69°F), upstairs children's rooms 22°C (72°F), open-plan area 23.5°C (74°F). On a day when it was 35°C (95°F) outside, it was about 25-26°C (77-79°F) in the evening (I’m being cautious as I can’t remember exactly).
@rick2018 And compared to the outside temperature, that was quite reasonable—especially for me and the ladies...
So what I want to say is that, in my experience, you can look forward to a house that stays reasonably cool, and you’re already on the right track with your plans.
As already suspected here 😉 we live near Augsburg. Our house was built by a carpentry company located in our village.
Sorry if my post was a bit unclear.
First and foremost: by ventilation I also mean cross-ventilation at night (this wasn’t clear in my post, sorry)! So in the evening, when it’s cooler, we open the windows, sometimes all night upstairs, in the children’s rooms, and downstairs we close them again when we go to bed. In the morning, my wife opens them again at 6:00 (or I do it in the children’s rooms when they are awake).
We live in a rural area, not in the city, so it cools down quite well at night and traffic noise isn’t an issue.
I actually wanted to write "put aside." We have ventilation and a heat pump from Viessmann, which could provide passive cooling with the so-called "NC box." However, we don’t have it yet, and it slipped down the priority list.
With the controlled residential ventilation, I can set a ventilation schedule for each weekday via the Viessmann app. At the beginning of summer, I set it as described above; in autumn I change it again (a lot during the day, less at night). In the long term, I want to see if I can make this "smarter" with Node-red.
Upstairs is shaded with roller shutters, downstairs with venetian blinds, all controlled via KNX. We have no skylights.
The open-plan living and dining area is open to the kitchen, so it is always about 1-2 degrees higher than the rest of the house. For example, today: basement 20.5°C (69°F), upstairs children's rooms 22°C (72°F), open-plan area 23.5°C (74°F). On a day when it was 35°C (95°F) outside, it was about 25-26°C (77-79°F) in the evening (I’m being cautious as I can’t remember exactly).
@rick2018 And compared to the outside temperature, that was quite reasonable—especially for me and the ladies...
So what I want to say is that, in my experience, you can look forward to a house that stays reasonably cool, and you’re already on the right track with your plans.
Thank you for your reply!
For us, both options from Viessmann would be possible, but I want to switch to the controlled residential ventilation system from Zehnder during the final selection, as they standardly offer carbon filters, which unfortunately Viessmann does not, or only as an accessory.
(A bit off-topic, but I’ve run into some issues here as well because we are planning to use an enthalpy exchanger, and there have been ongoing complaints for years—and still today—about a strange “plastic smell” with the model filled by Zehnder. So we’ll have to wait and see, especially what the builder will charge for making that change 🙄.)
I had a little hope that it might be possible to keep the temperature low without cross-ventilation through windows (we have allergy sufferers in the house), but it’s clear that this isn’t really feasible. Every now and then a little bit of hope surfaces again 😕. We’re very much looking forward to the house and believe it will turn out well. I just hope the builder’s provision for air conditioning will also be implemented, but we will only find out at the final selection, and unfortunately, there is still a long wait until then.
As I said, thanks again for your explanations, and I wish you continued happiness in your home…
For us, both options from Viessmann would be possible, but I want to switch to the controlled residential ventilation system from Zehnder during the final selection, as they standardly offer carbon filters, which unfortunately Viessmann does not, or only as an accessory.
(A bit off-topic, but I’ve run into some issues here as well because we are planning to use an enthalpy exchanger, and there have been ongoing complaints for years—and still today—about a strange “plastic smell” with the model filled by Zehnder. So we’ll have to wait and see, especially what the builder will charge for making that change 🙄.)
I had a little hope that it might be possible to keep the temperature low without cross-ventilation through windows (we have allergy sufferers in the house), but it’s clear that this isn’t really feasible. Every now and then a little bit of hope surfaces again 😕. We’re very much looking forward to the house and believe it will turn out well. I just hope the builder’s provision for air conditioning will also be implemented, but we will only find out at the final selection, and unfortunately, there is still a long wait until then.
As I said, thanks again for your explanations, and I wish you continued happiness in your home…
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