ᐅ Is a multi-split air conditioning system suitable for heating?
Created on: 19 Mar 2022 22:46
L
lesmue79
Does anyone here use a multi-split system for heating, for example as an alternative in older buildings when insulation or renovation is no longer worthwhile?
I’m not familiar with the various split systems, but I’ve come across them often as an alternative to conventional heating when insulation and renovation hardly make sense anymore for the current residents.
I would have concerns about noise, drafts, and the resulting dust circulation since it is an air-to-air heat pump after all.
A photovoltaic system would at least be available for the transitional period from spring to autumn.
I’m not familiar with the various split systems, but I’ve come across them often as an alternative to conventional heating when insulation and renovation hardly make sense anymore for the current residents.
I would have concerns about noise, drafts, and the resulting dust circulation since it is an air-to-air heat pump after all.
A photovoltaic system would at least be available for the transitional period from spring to autumn.
Nutshell schrieb:
This thread is about multi-split systems!Good evening Nutshell and other split/multi-split system users. What has your experience been with heating in an older building during winter? Have you noticed any trends in comfort and energy consumption so far?Nothing new regarding comfort, but I recently discovered that there have been some developments or ongoing progress in this area.
For heating operation, I would recommend plinth-type units. They release warm air near the floor and visually resemble radiators. For example, I find the Daikin unit quite attractive and it also seems technically sound and relatively quiet compared to other plinth units.
Daikin now also offers combined air conditioning/heating indoor units with additional hot water generation and storage. This can eliminate the need for a separate domestic hot water heat pump. For smaller residential units, this would be a great solution and likely much more affordable and easier to implement compared to an air-to-water heat pump system with water circuits and conversion to underfloor heating.
For heating operation, I would recommend plinth-type units. They release warm air near the floor and visually resemble radiators. For example, I find the Daikin unit quite attractive and it also seems technically sound and relatively quiet compared to other plinth units.
Daikin now also offers combined air conditioning/heating indoor units with additional hot water generation and storage. This can eliminate the need for a separate domestic hot water heat pump. For smaller residential units, this would be a great solution and likely much more affordable and easier to implement compared to an air-to-water heat pump system with water circuits and conversion to underfloor heating.
T
taschenonkel1 Dec 2022 16:23We have a large photovoltaic system (14.6 kWp) and a pellet heating system. On the ground floor, there is underfloor heating (170 m² (1830 sq ft)) and in the attic, radiators plus split air conditioners in every room. Additionally, the bedrooms, kitchen, and living room on the ground floor each have a split air conditioner as well. The living room unit is 5.1 kW, the others are 3.4 kW. Each split air conditioner is connected to a smart meter.
Today, I took some measurements specifically for this thread. Outside temperature is 4°C (39°F), desired temperature in the office (attic) is 20°C (68°F), radiators were turned off last night. The attic room was only recently renovated this year according to KFW standards, with triple glazing and appropriate insulation. The house was built in 1983. The exterior wall is Poroton/brick with a former 8 cm (3 inch) air gap, now filled with blown-in insulation. The room has about 25 m² (270 sq ft) of floor area:
Energy consumption since this morning at 8:00 (turned on): 2.7 kWh, which is 320 watts per hour.
Today, I took some measurements specifically for this thread. Outside temperature is 4°C (39°F), desired temperature in the office (attic) is 20°C (68°F), radiators were turned off last night. The attic room was only recently renovated this year according to KFW standards, with triple glazing and appropriate insulation. The house was built in 1983. The exterior wall is Poroton/brick with a former 8 cm (3 inch) air gap, now filled with blown-in insulation. The room has about 25 m² (270 sq ft) of floor area:
Energy consumption since this morning at 8:00 (turned on): 2.7 kWh, which is 320 watts per hour.
taschenonkel schrieb:
Since 8:00 this morning (turned on): 2.7 kWh, which is about 320 watts per hour. What exactly is the smart meter measuring?
Heat output? Electricity consumption of the indoor unit? Outdoor unit?
The indoor units shouldn’t actually consume that much power since the main workload is done by the compressor in the outdoor unit. The indoor units primarily only require power for the fan. A 320W fan would be quite loud.
If the SCOP values provided by the manufacturers are roughly accurate, the figures should be somewhere around 3.5 to 4.x, depending on the model. That would put it at least on par with typical air-to-water heat pump systems combined with underfloor heating.
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