The variable speed control of the chilled water pumps achieves an additional chilled water plant. power savings of around 5% [2]. These systems put even more demands on the variable speed chiller control. system, while not affecting the fixed-speed control system at all. However, the difference in compressor map.
The density of dry air can be calculated using the ideal gas law, expressed as a function of temperature and pressure: where: The specific gas constant for dry air is 287.058 J/(kgÂ·K) in SI units, and 53.35 (ftÂ·lbf)/(lbmÂ·Â°R) in United States customary and Imperial units. This quantity may vary slightly depending on the molecular composition of air at a particular location.
Dry air is a mixture of gases where the molecular weight can be calculated by adding the weight of each component. Ï = p / (R T) (1) where p = pressure (kPa) R = 286.9 = individual gas constant (J/kg oK) T = absolute temperature (oK). Ï = (101325 Pa) / ((286.9 J/kg oK) (273 oK)) = 1.294 kg/m3.