Hello everyone,
for our new single-family house (about 170sqm (1830 sq ft), brine-to-water heat pump for heating and domestic hot water), we are getting a Viessmann system. Viessmann offers the Natural Cooling Box (NC-Box) as an add-on (around 4000 euros including installation and additional thermostats), which allows cool water to circulate through the underfloor heating in summer (cooled down passively via a plate heat exchanger with the brine). I understand that the cooling capacity is limited by the dew point (and there will be no ceiling cooling). Generally, I hear that the indoor temperature difference is about 3°C (5°F) with or without cooling.
I also realize that temperature perception varies, but nevertheless: Can anyone share first-hand experience with this or a similar system? Is the cooling effect noticeable during summer? How is the electricity consumption? Does the control system work properly?
Furthermore, I read somewhere here in the forum that the NC-Box ALWAYS consumes electricity – even when cooling, for example in winter, is turned off. That can’t be right, can it? Is this nonsense? Maybe a bit of electronics run at 0.25W, but the pump would at least be off, right?
Thanks in advance for any insights!
for our new single-family house (about 170sqm (1830 sq ft), brine-to-water heat pump for heating and domestic hot water), we are getting a Viessmann system. Viessmann offers the Natural Cooling Box (NC-Box) as an add-on (around 4000 euros including installation and additional thermostats), which allows cool water to circulate through the underfloor heating in summer (cooled down passively via a plate heat exchanger with the brine). I understand that the cooling capacity is limited by the dew point (and there will be no ceiling cooling). Generally, I hear that the indoor temperature difference is about 3°C (5°F) with or without cooling.
I also realize that temperature perception varies, but nevertheless: Can anyone share first-hand experience with this or a similar system? Is the cooling effect noticeable during summer? How is the electricity consumption? Does the control system work properly?
Furthermore, I read somewhere here in the forum that the NC-Box ALWAYS consumes electricity – even when cooling, for example in winter, is turned off. That can’t be right, can it? Is this nonsense? Maybe a bit of electronics run at 0.25W, but the pump would at least be off, right?
Thanks in advance for any insights!
Stadtvilla19 schrieb:
Currently, it is 23.5°C (74°F) inside the house and 36°C (97°F) outside.Where exactly?S
Stadtvilla198 Aug 2020 18:36Where exactly? The indoor thermometer is placed inside on a small table against an exterior wall.
S
Stadtvilla198 Aug 2020 21:47We have a 54m² (580 sq ft) open-plan living and dining area that extends over half of the house, featuring 3m (10 ft) wide windows. All of these face southeast and southwest, so we get sunlight throughout the entire day. This is where we spend most of our time. The bedroom on the upper floor has the same temperature.
S
Stadtvilla1921 Aug 2020 11:54So, I can now explain in more detail how the cooling works for us. We have an urban villa with 150 m² (1,615 sq ft) that is fully exposed to the sun, facing south to southwest, with three large windows each 3.3 m (11 ft) wide. Our walls are 36.5 cm (14.4 inches) thick Ytong blocks without additional insulation. We keep the roller shutters down all day on the sides where the sun shines, and the windows and doors are kept closed. The cooling system was put into operation three weeks ago, and for the past two weeks, the outdoor temperature has been over 30°C (86°F) daily.
Inside the house, on the entire ground floor, temperatures range between 24.5 and 25.2°C (76 to 77.4°F), gradually warming up a bit toward the evening. The upper floor has a Ytong ceiling and an uninsulated cold roof. Here, temperatures range from 24.5 to 26.5°C (76 to 79.7°F), also warming up toward the evening. The temperatures remain quite stable, cooling down at night to the lower values mentioned and rising during the day to the highest values given.
The neighbors around us, who also built with Ytong but have pitched roofs, experience about 27°C (80.6°F) on the ground floor and rather 28 to 29°C (82.4 to 84.2°F) upstairs.
So, I would initially say that the cooling system does make a noticeable difference.
Inside the house, on the entire ground floor, temperatures range between 24.5 and 25.2°C (76 to 77.4°F), gradually warming up a bit toward the evening. The upper floor has a Ytong ceiling and an uninsulated cold roof. Here, temperatures range from 24.5 to 26.5°C (76 to 79.7°F), also warming up toward the evening. The temperatures remain quite stable, cooling down at night to the lower values mentioned and rising during the day to the highest values given.
The neighbors around us, who also built with Ytong but have pitched roofs, experience about 27°C (80.6°F) on the ground floor and rather 28 to 29°C (82.4 to 84.2°F) upstairs.
So, I would initially say that the cooling system does make a noticeable difference.
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