New construction + exhaust heat pump according to the builder, is a trench collector affordable?

Hi construction expert,

once again an invitation to you to come and listen to it in our environment...

If only the cheapest offer gets the contract: yes. Otherwise, I would really be glad if these "condition descriptions" of a split system were finally banished to where they belong: the realm of myths

These things are and remain miserable noise makers. You once gave the maximum permissible noise emissions in residential areas in a thread.

I just looked them up again:

Day Night

Core, village and mixed-use areas 60 dB(A) 45 dB(A)
General residential areas 55 dB(A) 40 dB(A)
Pure residential areas 50 dB(A) 35 dB(A)

It may even be that the split units comply with this, the values are anyway insanely high. At least for anyone who still has reasonably good hearing. To be able to sleep at 40 dB(A) emission level with the window open, you probably have to be half deaf.

For comparison, I am currently sitting in the office, first floor on a heavily trafficked 6-lane road with 1980s double glazing and loud humming ventilation (air conditioning, windows are closed). In the office, the level fluctuates at total quiet of all colleagues (almost nobody is here today) between 40 (just cars in front of the window) and 45 dB(A) (= truck driving by). And I am supposed to accept that at night in a residential area?

And I also immediately agree that there is a correlation between quality (equally quiet) and price. But since many houses are built with property developers or general contractors, the cheapest units are installed as a rule. I wouldn’t do it differently as a GC either. And most of the owners who contract it themselves probably don’t really care and just set it up so that they themselves don’t hear it. But then the neighbors get to enjoy it…

I would be in favor of a law that forces every manufacturer and installer of such units to install them themselves at home in front of their bedroom window. That might bring something…

Best regards,

Andreas

Hello Andreas,

Hi Bauexperte,
and again an invitation to you to come and listen to it in our environment...

On my next visit to Straubing I might drop by... if Schwabach happens to be on the way

Because you always say that 40 dB is loud, I took a little reference at RWE:

**[...] For comparison: leaves rustle at about 10 decibels, breathing noises reach 25 decibels, birds chirp at about 50 decibels

Many device manufacturers are therefore increasingly paying attention to the noise of their devices. Some new washing machines, whose predecessors quickly thundered at 78 decibels during the spin cycle, now wash laundry at only 45 to 50 decibels – about the volume of a normal conversation. [...|

Many other devices are already available today in “quiet” versions. Blenders with sound insulation now reach only about 80 decibels. Old devices easily reach up to 93 decibels, as loud as a motorcycle. New vacuum cleaners now do their job at 69 decibels, which corresponds to the noise of a car passing by at ten meters distance. Cooling devices today produce only 34 decibels. That is as loud as a ticking clock or a whispered conversation and is a real improvement especially in open kitchens. And a modern dishwasher does the washing up at 38 to 39 decibels. Still loud are range hoods. Especially the blower causes constant noise while cooking. Average devices produce 67 to 70 decibels, so as loud as a vacuum cleaner, a car, or a busy street. New good devices do the same job at only 58 to 60 decibels – which corresponds roughly to a typical office noise level. Some even come down to 51 decibels and are thus only as loud as quiet radio music.

That of course assumes that every household uses only the newest generations of appliances, which I – honestly – do not believe; after all, we are also talking about quite some money. Against the background of this information, which can be arbitrarily extended with our ambient noises (how many dB does a snorer actually produce?), *I* consider 40 dB not loud. Only – everyone has different thresholds which they find tolerable and which not. In this respect, I find it pointless to discuss noises and their reduction to “x”; we will hardly come to a common denominator

**Source: RWE Magazine

Rhenish greetings

Hi construction expert, please don’t be mad at me, but this time you’re walking on thin ice. You yourself write in your comparisons:

Laundry already at 45 to 50 decibels – which corresponds roughly to the volume of a normal conversation.

40 to 45 correspond approximately to a slightly muffled conversation between two people in front of your open bedroom window: And you can sleep through that?

The hearing aid battery must be dead by then... SCNR

And yes, I have a decent understanding of noise levels and how they are measured according to DIN and all that jazz. Part of my job also involves workplace design in the plants I design and any discussions with customers about noise levels, what is tolerable, how to reduce them, etc…

Best regards, Andreas

The trench collector cannot be realized with the construction company. Exactly for the reasons that elVincent has already mentioned. I am rather skeptical about the air/water heat pump, especially because the company has no experience with it yet. The surface collector would therefore be my favorite, also because the price difference is negligible due to the subsidy.

Has anyone installed something like this here? What kind of ongoing costs should I expect roughly?

I just don’t want the gas heating to end up being the better solution in the end.

When I read 40-45 or 50-55, these figures are quite broad. If I remember correctly, the sound pressure doubles every 6dB?

Hi,

If I remember correctly, the sound pressure doubles every 6db?

yes, correct. And depending on the person, 5 to 10 db more are perceived as an approximate doubling of the noise level.

Best regards,

Andreas