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Ideal-gas specific heats of various common gases (a) At 300 K Gas constant, Rc p c v Gas Formula kJ/kg·K kJ/kg·K kJ/kg·K k Air — 0.2870 1.005 0.718 1.400 Argon Ar 0.2081 0.5203 0.3122 1.667 Butane C 4H 10 0.1433 1.7164 1.5734 1.091 Carbon dioxide CO 2 0.1889 0.846 0.657 1.289 Carbon monoxide CO 0.2968 1.040 0.744 1.400 Ethane C 2H 6 0.2765 ...
changes in relation to the performance of automatic HVAC control systems. The chart is also useful in troubleshooting a system. For additional information about control of the basic processes in air handling systems, refer to the Air Handling System Control Applications section.
In thermal physics and thermodynamics, the heat capacity ratio, also known as the adiabatic index, the ratio of specific heats, or Laplace's coefficient, is the ratio of the heat capacity at constant pressure (C P) to heat capacity at constant volume (C V).
Psychrometrics can be used to predict changes in the environment when the amount of heat and/or moisture in the air changes. Use of psychrometric analysis is also important to determine the volume flow rates of air to be pushed into the ducting system and the sizing of the major system components.
Ratios of specific heat for gases with constant pressure and volume processes. Internal Energy. For an ideal gas the internal energy - u - is a function of temperature. A change in internal energy can be expressed as. du =cv dT (1) where. du = change in internal energy (kJ/kg)
The sensible heat in a heating or cooling process of air (heating or cooling capacity) can be calculated in SI-units as. h s = cpρ q dt (1) where. h s = sensible heat (kW) cp= specific heat of air (1.006 kJ/kg oC) ρ = density of air (1.202 kg/m3) q = air volume flow (m3/s) dt = temperature difference (oC)
