This can be readily seen in ApacheHVAC system simulation results for higher and lower cooling coil contact factors in a humid climate. While the bypass air is obviously also more humid, the net result will be a lower leaving wet-bulb temperature (WBT) for the same dry-bulb LAT-i.e., greater wet-bulb depression. ![]() On the other hand, a low contact factor also has the same effect as intentionally bypassing some of the air around the coil so that the cooling coil can be operated at a very low temperature for maximum dehumidification, and then mixing the bypass fraction with the very dry air off the coil to get a final LAT. As the contact factor is reduced, the required coil temperature, and thus also water temperature, is lower, which has implications for chiller operating efficiency and chilled-water reset controls. The software calculation illustrates the operating conditions, dimensions, weight, and volume of the coil selected. A higher contact factor has the advantage of achieving the desired leaving air temperature (LAT) with relatively warmer water from the chiller. Coils for Windows (Coils1g) selection software is all you need to make the right choice from our wide product range. ![]() The PSP software allows for easy selection of the. ![]() For a given flow rate, higher contact factors will tend to be associated with coils that either have more rows of fins or a larger face area, and thus lower face velocity. The FRITERM-Coils (FRTCoils) software developed for designing standard and special/custom-made products. Typical values of contact factor are in the range 0.7 - 0.95.
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