ᐅ Automation of a Mechanical Ventilation with Heat Recovery (MVHR) System
Created on: 23 May 2018 17:44
H
Hausbauer1
Hello everyone,
I’m currently struggling again with the warm indoor temperatures (unfortunately, there is no mechanical ventilation with heat recovery). When I am at home, I try to ventilate vigorously whenever it is cooler outside than inside, even if the temperature difference is only 1-2°C (34-36°F). And when it’s warmer outside, everything is shaded and the windows stay closed.
This obviously pushes comfort limits. If you want to stay in a room, ventilating at the same time is not always very comfortable. Also, you don’t want to leave the windows open all day when you’re not at home or when it gets warmer as the day goes on.
My question to all experts and owners of centralized ventilation systems is: can a mechanical ventilation system be programmed to operate exactly like the rational ventilation behavior you would do manually? So, no ventilation when it’s warmer outside and strong ventilation when it’s cooler outside. Of course, without heat recovery in this case. In winter, it would be different, with ventilation mainly during the day when temperature differences are smaller, and less or no ventilation at night when it’s very cold outside.
I think it’s clear what I’m getting at. Can these systems be automated to that extent, or is that too much to expect?
Thanks.
I’m currently struggling again with the warm indoor temperatures (unfortunately, there is no mechanical ventilation with heat recovery). When I am at home, I try to ventilate vigorously whenever it is cooler outside than inside, even if the temperature difference is only 1-2°C (34-36°F). And when it’s warmer outside, everything is shaded and the windows stay closed.
This obviously pushes comfort limits. If you want to stay in a room, ventilating at the same time is not always very comfortable. Also, you don’t want to leave the windows open all day when you’re not at home or when it gets warmer as the day goes on.
My question to all experts and owners of centralized ventilation systems is: can a mechanical ventilation system be programmed to operate exactly like the rational ventilation behavior you would do manually? So, no ventilation when it’s warmer outside and strong ventilation when it’s cooler outside. Of course, without heat recovery in this case. In winter, it would be different, with ventilation mainly during the day when temperature differences are smaller, and less or no ventilation at night when it’s very cold outside.
I think it’s clear what I’m getting at. Can these systems be automated to that extent, or is that too much to expect?
Thanks.
S
Steffen8030 May 2018 09:00cybergnom schrieb:
Because a controlled ventilation system should remove the old, used air to the outside and not distribute it inside the house.I am, of course, talking about heat recovery!
In other words, the warmer the exhaust air is (for example, from a fireplace), the more the incoming fresh air can be heated. Theoretically it works... but in practice it hardly makes any difference. In winter, our supply air is about 2 to 3 degrees Celsius (4 to 5 degrees Fahrenheit) colder than the room air, regardless of whether the living room is heated with a fireplace or not.
Right now, in this heat, we use air conditioning to cool. The whole house feels comfortable at about 22 degrees Celsius (72 degrees Fahrenheit), thanks to quiet Daikin indoor units. The Daikin also runs very quietly.
Best regards, Steffen
H
Hausbauer130 May 2018 11:59Steffen80 schrieb:
Now with the heat, we are using air conditioning to cool. Throughout the entire house it’s a comfortable 22°C (72°F). Thanks to the quiet Daikin indoor units. The Daikin also runs very quietly.Did you have the air conditioning installed from the start or did you only build the preparations and retrofit it later? I’m particularly interested in what exactly needs to be prepared during the shell construction to be able to retrofit it later without problems, if it turns out that other solutions (shading, passive cooling, etc.) are not sufficient.
How did you handle the capacity of the different indoor units in the variously sized rooms? Are all connected to a single outdoor unit?
Steffen80 schrieb:
So basically, the warmer the exhaust air is (for example, through a chimney), the more the supply air can be heated. Theoretically it works… but in practice it barely makes a difference.It probably does help a little, but not very much. To truly distribute the heat, in addition to a fairly open architecture, a water heat storage connected to the heating system likely helps most. Although almost everyone agrees that this is not economical.
Air conditioning is a topic you could write a doctoral thesis about.
If you create a proper cooling concept and prepare the lines accordingly, you might as well have them installed right away.
My air conditioner has been running continuously since yesterday morning, parallel to the controlled ventilation system. Summer is definitely here.
But to get back to your questions... you need power, drainage, and refrigerant lines from the outdoor unit to each indoor unit.
The problem is that the refrigerant lines come in different diameters.
In other words, if you use diameter A, you need the corresponding system for A; if you use B, you need system B. You can also retrofit with adapters, but that’s more of a makeshift solution.
So, when preparing, you’re basically only saving on the system unit itself. Everything else has to be planned and installed in advance. At that point, you might as well complete the entire installation.
If you create a proper cooling concept and prepare the lines accordingly, you might as well have them installed right away.
My air conditioner has been running continuously since yesterday morning, parallel to the controlled ventilation system. Summer is definitely here.
But to get back to your questions... you need power, drainage, and refrigerant lines from the outdoor unit to each indoor unit.
The problem is that the refrigerant lines come in different diameters.
In other words, if you use diameter A, you need the corresponding system for A; if you use B, you need system B. You can also retrofit with adapters, but that’s more of a makeshift solution.
So, when preparing, you’re basically only saving on the system unit itself. Everything else has to be planned and installed in advance. At that point, you might as well complete the entire installation.
sven.conzi30 May 2018 17:42haydee schrieb:
Our system has a summer setting. When it’s warm, it does not supply fresh air into the house and only opens again once the outdoor temperature drops below the indoor temperature in the evening. With the summer setting, there is no heat recovery.
This afternoon, we had a comfortable 22°C (72°F) inside the house. It was warmer over the weekend, as the patio door was open at midday.
I’m curious to see how it performs during the summer. These systems are not air conditioners; they can only delay heat gain.Hello, is this a bypass control? Which mechanical ventilation with heat recovery system do you have?sven.conzi schrieb:
Hello, is this a bypass control system? Which controlled residential ventilation system do you have?Central ventilation unit with heat recovery
For Stiebel LWZ 604 air or Tecalor TCO 2.5
Similar to a bypass but with temperature control. Adjusts the ventilation levels automatically.
S
Steffen8030 May 2018 22:13We had one installed right away. Just preparing it is definitely not worthwhile. Costs were about 10,000 EUR.
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