MEP HVAC engineering, étude thermique et fluide

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Low tech building with higher comfort

Immagine a building with 5% more rentable surface and higher standard.

Immagine your tenants more satisfied, without mould problems and less investement.

The base of wellbeing in housing is energy. Clever energy concepts bring shelter, drinking water, electricity for cooking and entertainment as well as fresh air with an enjoyable temperature.

Radiators, floor heating ore cooling are not mandatory for the basic needs.

The question is: Is the comfort in a low-tech house compatible?

The Boiler in the classical plumbing engineering heats up water which is then mixed to different temperatures. These temperatures (circuits) are piped through the hole building to the consumers. The cost for material is proportional to the size of the building and the amount of circuits.

To build high quality low tech houses, we should

  • Shorten Pipe ways / paths
  • Reduce circuits / strands
  • Raise the comfort level for the users

Hotels are a good example for comfort or even luxury. Visitors feel good, because all their needs are served. Huge hot drinking water tanks and permanent circulating systems guarantee an instant hot shower or a long and relaxing bath. Fancoils are Air conditioners. They are feed by up to four independent piping systems. Flow and return pipes for chilled water in summer and flow and return pipes for warm water in winter.

School buildings, Kindergartens, offices often use HVAC systems. Many times the Ventilation System doesn’t heat or cool the building at all. Most popular for cooling purpose are still the very inefficient split units air conditioners.

Another Concept is heating and cooling through ceiling elements. Radiant ceilings are fed by only one strand, flow and return.

If we combine these advantages, we get to the point, that Air should be used as heating and cooling media. Worm water as an excellent heat transmitter is still used in the basement or the technical rooms to condition the air in the ventilation units. Drinking water pipes are dimensioned as small as possible to ensure hygiene and cost efficiency. Potable water warm will be designed in a loop, so that warm water is directly accessible at any point in the building. The room temperature will be regulated by the air flow rate.

Conventional buildings in Germany have these strands

  1. Flow and return for the radiators (60, 40 °C)
  2. Flow and return for floor or ceiling radiators (40, 30 °C)
  3. Flow and return for cooling (6, 15 °C)
  4. Potable water cold, warm and circulation
  5. Waste water and Rainwater
  6. Supply air and exhaust air
  7. Electricity, high low voltage and data

While gaining comfort of fresh air we can reduce the strand to

  1. Potable water cold and warm
  2. Waste water, rain water
  3. Supply and exhaust air
  4. Electricity, high low voltage and data

So, the strands are reduced from 15 to 8 pipes. This leads to less costs, less resources and less energy consumption. The usable and sellable surface of the building looses 50 % less surface.

For the satisfaction and the health of the habitants it is important to use air humidification in winter which can be used as additional adiabatic cooling in summer.

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