TGA planner difficulties, underfloor heating supply temperature + wastewater ventilation

  • Erstellt am 2022-07-15 10:22:47

RotorMotor

2022-09-27 17:23:19
  • #1
The information is just too thin to provide good advice. One would need the room-by-room heating load, areas, etc. Maybe there is a good reason why the demand is so high up there. Poorly insulated roof/ceiling? Roof window? Other large north-facing windows? Or calculation error? Otherwise, I can’t explain how one comes to assign 15 to the living room and 5 to the bedroom.
 

Pacmansh

2022-09-27 17:39:03
  • #2
I would already be satisfied with being better advised than by this lady who does the calculation (after all, authorized signatory at a larger engineering office).

It is a new building, a terraced house with a flat roof. Children's room 1 has only one south-facing exterior wall, children's room 2 faces south and east. The bathroom has a north-facing window. There are no roof windows. Thus, only the points of roof insulation or calculation errors are considered. Additionally, there is the central exhaust system with window rebate ventilators, although these cannot explain the large difference between the children's rooms on the upper floor and the living area on the ground floor. Possibly I can get the room-specific heating load directly from the developer. The planner does not want to disclose it.

To approach the topic: The guest room on the ground floor (radiator length 83m, valve opening 15cm) has a size of 10 sqm and two exterior walls, children's room 1 on the upper floor (2 radiators with 132m and 138m, valve opening 5cm) has a size of 12.7 sqm, only one short exterior wall, window area is similar.
 

Joedreck

2022-09-28 06:22:59
  • #3
The HK lengths are above all too different. Very short ones can be combined, very long ones should be avoided. Without being particularly versed in the field of fluid dynamics, the necessary hydraulic balancing then becomes a disaster. And why can't less VLT be used? Apparently, the Prokoristin cannot enter less into the old tool? I expect something like this from an average heating installer who had training 10 years ago, but not from an engineering office.
 

Pacmansh

2022-09-28 08:55:00
  • #4
The work being done is really disgusting. Their plan was probably just to calculate something, give it to the developer, and then they were done. Someone asking questions was probably not planned. She entered less lead time, but then there is a shortfall in the two children's rooms. I can basically understand that since the VA is already at 5cm. But I don't understand why the heating load in the rooms is so high. It can basically only be related to the ventilation (central exhaust in bathrooms and kitchen, supply air via window frame ventilators). For example, I looked at the bathroom on the upper floor and children's room 1. Both are on the upper floor, so the ceiling insulation is identical. Bathroom: 9.5m², target temperature 22°C, HK length 126m, VA 5cm Children’s room 1: 12.7m², target temperature 20°C, HK length 132+138m, VA 5cm (Here with 1 watt shortfall, so pretty much spot on). So more than twice the length of heating pipe is required to get the children's room to 20° compared to the bathroom to heat it to 22°C.
 

driver55

2022-09-28 10:51:06
  • #5

Are "straw pipes" actually being installed? What diameter and wall thickness do the heating coils have?
KfW55 and 38 degrees somehow don't quite match.

I would design the bathroom for 23 degrees (down to -10 degrees). For possible lower temperatures, use electric heating as backup. The flow temperature should then maybe be in the range of 30-32 degrees. The rest of the house is then straightforward.
 

Alessandro

2022-09-28 11:25:16
  • #6
What is the total heating load of the building? For KfW55 it should not be more than 35W/m². Something is wrong...

Nowadays, all well-known heating manufacturers perform heating load and installation calculations. They have programs that output this within an hour. No need for an [TGA office].

For new buildings, 30°C at [NAT] is also now the standard.
 

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