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.
The symbol for the Universal Gas Constant is Ru= 8.314 J/mol.K (0.0831 bar dm3 mol-1 K-1). The Specific-Heat Capacity, C, is defined as the amount of heat required to raise the temperature by 1K per mole or per kg.The Specific Heat Capacity is measured and reported at constant pressure (Cp) or constant volume (Cv) conditions. For monoatomic gases Cp=2.5Ru J/mol.K and Cv=1.5Ru J/mol.K repectively.The ratio of the two specific heats is called the adiabatic ratio of the gas.t temperature t the heat content of water vapor is: hw = 2501 + 1.84 t. Notice that water vapor, once generated, also requires more heat than dry air to raise its temperature further: 1.84 kJ/kg.C against about 1 k J/kg.C for dry air.