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2. Cooling load temperature difference calculation method

   en.wikipedia.org/wiki/Cooling_load_temperature...

   These variables include, building material of the envelope, thicknesses of the building materials, day of the year, time of day, orientation of the surface (e.g. wall or roof, 90 degrees or 180), and wall face orientation (cardinal directions, i.e. N, NW, S, SE, etc.), to name a few.

3. Sol-air temperature - Wikipedia

   en.wikipedia.org/wiki/Sol-air_temperature

   The above equation only takes into account the temperature differences and ignores two important parameters, being 1) solar radiative flux; and 2) infrared exchanges from the sky. The concept of T sol-air was thus introduced to enable these parameters to be included within an improved calculation. The following formula results:

4. Building airtightness - Wikipedia

   en.wikipedia.org/wiki/Building_airtightness

   The relationship between pressure and leakage air flow rate is defined by the power law between the airflow rate and the pressure difference across the building envelope as follows: [16] q L =C L ∆p n. where: q L is the volumetric leakage airflow rate expressed in m 3 h −1; C L is the air leakage coefficient expressed in m 3 h −1 Pa −n

5. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   The natural air leakage, under calmer conditions, is likely to be much less. As a result, the so-called natural ACH may be a factor of 10-25 times smaller. [ 14 ] This is of relevance since high-performance building methodologies strive to keep ACH low under standardized, weather-stressed conditions, while air quality considerations may require ...

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7. Discharge coefficient - Wikipedia

   en.wikipedia.org/wiki/Discharge_coefficient

   In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the ideal discharge, [1] i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.

8. Infiltration (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Infiltration_(HVAC)

   Infiltration is sometimes called air leakage. The leakage of room air out of a building, intentionally or not, is called exfiltration . Infiltration is caused by wind , negative pressurization of the building, and by air buoyancy forces known commonly as the stack effect .

9. Damp (structural) - Wikipedia

   en.wikipedia.org/wiki/Damp_(structural)

   Moisture condenses on the interiors of buildings due to specific interactions between the roof and wall. Leaks most commonly occur on flat-roofed buildings. [ 4 ] : 328 Certain building materials and mechanisms can be used to prevent condensation from occurring in these areas, therefore reducing structural dampness and potential mold infestation.