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warum nöd?

warum nöd?

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M. L.
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M. L.
Diese Lernkarten bieten einen umfassenden Überblick über die Berufskunde im Bereich Gebäudeenergie und -isolierung. Sie behandeln Themen wie die Vorteile von Außen- gegenüber Innenisolierung, die Bedeutung von Algen- und Schimmelwachstum auf Fassaden, die Vergleichbarkeit von eingebetteter und Betriebsenergie sowie die Definition von "Nullenergiehäusern". Die Karteikarten richten sich an Fachleute und Interessierte, die sich mit energieeffizientem Bauen und den physikalischen Grundlagen von Gebäuden vertraut machen möchten.
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24.02.2016 / 30.03.2016
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Lernkarten

List the 3 enviromental loads of building envelope:

·      Vapour pressure difference

·      Air pressure difference

·      Temperature difference

 

Which heat losses helps thermal insulation to reduce?

·      Transmission (Conduction)

What happened in the 30s last century with the heatings?

·      Central heating systems were installed. It was possible to heat all rooms permanently.

What was the reason of the „energy“ dive in 1973?

·      Oil crisis

·      Club of rome report „exponential growth isnt sustainable“

Whats prescribed in the cantonal building codes?

·      Using the MuKEn (Mustervorschriften der Kantone im Energiebereich) are the minimum heat insulation listed.

How can you make leakages or weak points in insulation visible?

·      With termography

Whats propably the most importent argument for good thermal insulation?

·      Comfort. High internal surface temperatures of well-insulated components help people to feel much more comfortable.

Explain the "zero houses":

The "operational energy per year":

  • Zero heating house --> No heating for room temp: Qh=0
  • Zero heat house --> No heater for warm water: QDHW=0, Minergie A
  • Zero energy House (in balance) --> EE=0, incl. embedded energy
  • Zero energy House (in balance with traffic) --> ET=0, incl. embedded energy

 

The two kinds of embedded energy:

  1. To build the new house
  2. To replace building elements

After +/- 100 years you have invest the the same amount of energy. Doesnt matter if you replace elements for 50 years (50 years of lifetime plus 50 years replacements) or if you build 2 new houses.

How can you compare the embedded with the operational energy?

To compare the embedded energy withe the operational energy you can either divide the embeddeed energy by 50 (lifetime of a house in years) and compare it then with a operational energy or multiply the operational energy with 50 (the same meaning) to compare it with the embedded energy.

Which kind of insulation is to prefer from a building-physics standpoint of view?

Why is outter over inner insulation to prefer?

Because of the ris by inner insulation. It would be absolutly necessary to have an unbroken, room-side vapour seal. Otherwise, the warm, humid indoor air can lead to condensation on the cold outer wall, which can lead to mould growth behind the thermal insulation.

Whats commonly found on external, plastered insulations?

Growing of algae or possibly mould occuring after a time

What is the reason for algae or mould growing on a facade?

A well-insulated facade is no longer heated up from the inside as it is the case with poorly insulated walls. Therefore, the surface remains cold at low outside temp. In clear nights, the facade also loses radiant heat to the cold space and cools again from a few degrees to the dew point temp. This results in wetting through condensation.

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