Air leakage (infiltration) that finds its way into the room may either be computed automatically in accordance with recognised research on the subject or the user may over-ride and define their own air infiltration rates. Infiltration air conditions are considered by the program as being at Ambient. Caution should be used to avoid risk of over specifying air infiltration where positive pressure air conditioning and/or ventilation systems apply to the room design under consideration. Air infiltration is more likely to become air leakage in such circumstances and any figures entered for air infiltration only likely to adversely affect (increase) the final air conditioning loads.
The program automatically enters typical air change/infiltration values based upon studies for rooms of various sizes and with fairly traditional designs and construction materials. These may be over written by clicking in the alternative options label but will suffice to provide reasonable and safe values if more precise figures are not known.
Infiltration may be specified using any one of four methods:- Air changes per day (24 hour day); Litres per second; Cubic metres per minute; Cubic metres per second. The program, with the benefit of automatically established room volume, automatically computes the remaining values against any one of the four input methods selected.
Infiltration may be specified using any one of four methods:- Air changes per day (24 hour day); Cubic feet per second; Cubic feet per minute; Cubic feet per hour. The program, with the benefit of automatically established room volume, automatically computes the remaining values against any one of the four input methods selected.
Recommended number and size of freezer room PRV (Pressure Relief Valves) Room m³ cm² Room ft³ in² PRV 100 30 3550 5 1 200 60 7050 9 2 400 90 14100 14 3 750 120 26500 19 4 1500 150 53000 23 5 3000 180 106000 28 6 6000 210 212000 33 7 12500 300 441500 46 10 25000 450 883000 70 15 50000 750 1765500 115 25 100000 1200 3531000 185 40