ᐅ Challenges for MEP planners: underfloor heating flow temperature and wastewater ventilation
Created on: 15 Jul 2022 10:22
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Pacmansh
Hello,
we are at the beginning of the construction phase for our development project with the builder, and I am having some disagreements with the MEP planner. To be better prepared for the discussion, I would appreciate your assessment.
Point 1) Supply temperature of underfloor heating, new building, KfW55 standard, air-to-water heat pump
The supply temperature of the underfloor heating (end-terrace house on both floors) was stated to me as 40°C (104°F) after inquiry. This seems absurdly high to me. Additionally, I was informed that the surface temperature is designed to a maximum of 27°C (81°F) due to the flooring materials. Somehow, this does not seem consistent. When I asked about lowering the supply temperature, the response was: "A general reduction is not feasible with the underfloor heating without reducing the pipe spacing to an unacceptable level."
Do you have any ideas how I can respond to this in a reasonably professional way? Are there any documents or sources I could refer to, or information I should request?
Point 2) Wastewater venting
Contrary to earlier agreements, this has been planned in a rather unfavorable location. The reason given is "because the wastewater vent and the residential ventilation (exhaust air) must be routed over the roof with a certain separation according to flat roof guidelines." What distance should be maintained here? A quick online search only showed a 30cm (12 inches) distance to other building components. Basically, this is about the roof penetrations and their distance from each other, correct?
we are at the beginning of the construction phase for our development project with the builder, and I am having some disagreements with the MEP planner. To be better prepared for the discussion, I would appreciate your assessment.
Point 1) Supply temperature of underfloor heating, new building, KfW55 standard, air-to-water heat pump
The supply temperature of the underfloor heating (end-terrace house on both floors) was stated to me as 40°C (104°F) after inquiry. This seems absurdly high to me. Additionally, I was informed that the surface temperature is designed to a maximum of 27°C (81°F) due to the flooring materials. Somehow, this does not seem consistent. When I asked about lowering the supply temperature, the response was: "A general reduction is not feasible with the underfloor heating without reducing the pipe spacing to an unacceptable level."
Do you have any ideas how I can respond to this in a reasonably professional way? Are there any documents or sources I could refer to, or information I should request?
Point 2) Wastewater venting
Contrary to earlier agreements, this has been planned in a rather unfavorable location. The reason given is "because the wastewater vent and the residential ventilation (exhaust air) must be routed over the roof with a certain separation according to flat roof guidelines." What distance should be maintained here? A quick online search only showed a 30cm (12 inches) distance to other building components. Basically, this is about the roof penetrations and their distance from each other, correct?
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Alessandro14 Dec 2022 09:32Torti2022neu schrieb:
Efficiency looks completely different. You don’t have an older building, do you?
For a new build, the supply temperature with outdoor temperatures like that is a disaster – the heat pump can’t be blamed, but the planner who comes up with such a design can. However, if the house is not properly insulated, there’s no point in even trying with supply temperatures of 28, 30, or 35°C (82, 86, or 95°F)...
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Torti2022neu14 Dec 2022 10:55Alessandro schrieb:
If the house is not properly insulated, there is no point in trying with flow temperatures of 28, 30, or 35°C (82, 86, or 95°F)...For a 35°C (95°F) flow temperature, however, it is sufficient to install new radiators, upgrade the windows, and insulate the ceiling above and below. That is manageable. At -7°C (19°F), my tenant reached an indoor temperature of 22°C (72°F) with the above conditions and a flow temperature of 36°C (97°F).This doesn’t exactly match the topic, but since it’s about problems, I’ll ask here:
The screed has now been poured, but unfortunately the workers were not given the current plan. The kitchen area and the utility room were poured at a height intended for tiling, so they are 8mm (0.3 inches) too low. It’s not a large area, approximately 18m² (194ft²) in total. The coverage over the heating is sufficient; the issue now is how to level the height difference.
What would be a sensible approach here? Simply applying a leveling compound on top, or is that too simplistic?
The screed has now been poured, but unfortunately the workers were not given the current plan. The kitchen area and the utility room were poured at a height intended for tiling, so they are 8mm (0.3 inches) too low. It’s not a large area, approximately 18m² (194ft²) in total. The coverage over the heating is sufficient; the issue now is how to level the height difference.
What would be a sensible approach here? Simply applying a leveling compound on top, or is that too simplistic?
Pacmansh schrieb:
This might not fit the title exactly, but since this is about problems, I'll ask here:
The screed was just poured, but unfortunately the workers were not given the current plans. The kitchen area and the utility room were poured at a height meant for tile installation, so they are 8mm (0.3 inches) too low. It’s not a large area, maybe about 18 square meters (194 square feet) in total. The coverage over the underfloor heating is still sufficient; the issue now is to even out the height difference.
What would be a reasonable approach here? Simply applying leveling compound on top, or is that too simplistic?You probably mentioned it somewhere, but what is going to be installed instead of tiles? The options for leveling depend on that. Perhaps after answering this question @KlaRa could provide some input?P.S. Whoever messed up by not passing on the plans should also bear the costs for the damage (additional expenses), right?
This time it was not the planners but the construction manager. None of the costs should remain with us. I just want to prevent a simple solution being chosen that would disadvantage us. I will also have our building surveyor look into it.
Vinyl flooring is planned to be installed as a glued-down application. A leveling compound will be applied anyway. Therefore, the height difference of 8mm (0.3 inches) must be evened out.
Vinyl flooring is planned to be installed as a glued-down application. A leveling compound will be applied anyway. Therefore, the height difference of 8mm (0.3 inches) must be evened out.
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