dew-point temperature


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dew-point temperature

[′dü ‚pȯint ′tem·prə·chər]
(chemistry)

dew point

dew pointclick for a larger image
If the temperature is +30°C and there is 15 gm of water vapor per kg of dry air and the air is cooled to +20°C, saturation will occur. +20°C is the Dew point. Similarly, Dew point is +33°C if air with 5 gm of water vapor per kg is cooled till it becomes saturated.
The temperature to which a given parcel of air must be cooled at constant pressure and constant-water-vapor content for saturation to occur. It is the temperature at which the saturation vapor pressure of the parcel is equal to the actual vapor pressure of the contained water vapor. Any further cooling usually results in the formation of dew or frost. Also called the dew-point temperature. When this temperature is below 0°C, it is sometimes called the frost point.
References in periodicals archive ?
Furthermore, adding dew-point temperature makes the model (Model 3) slightly better than with just one regressor (Model 1).
Dew-point temperature and diffusion solar radiation both show negative correlation during the cooling period, but positive correlations were found during the heating period.
A small vacuum pump is used to draw a small sample of air from the test section of the duct and across the chilled mirror dew-point hygrometer sensor, where the dew-point temperature is measured.
Superheat was calculated using dew-point temperature at the evaporator outlet pressure.
For the conventional design, a low temperature well below the ambient temperature is achieved through an expansion device (capillary tube, expansion valve, short tube, and the like), resulting in a surface temperature lower than the corresponding dew-point temperature. Therefore, condensation takes place on the surface if there is no thermal insulation.
It was also mentioned that the dew-point temperature of CFB boiler flue gas should be determined.
Although it is not yet a guideline, a preliminary report to ASHRAE's Technical Activities Committee from the MTG suggests that a 60[degrees]F (16[degrees]C) dew-point temperature can be used as a "prudent upper limit" that describes the normal behavior of well-designed and maintained mechanically cooled buildings in any climate during the cooling season.
Figure 2 show a similar map for dew-point temperature. Again, most stations appear as gray dots (no trend), but among those with positive trends, a large number are located in Eastern Europe, England, and North Africa.
The refrigerant mass flow produced by the compressor increases with increasing suction dew-point temperature and decreasing discharge dew-point temperature.
The properties determined include bubble-and dew-point temperatures, vapor pressure, equilibrium composition of the components, enthalpy, and entropy of the mixtures at saturation pressures.
The rate of change of the evaporator wall temperature during the plant ON state and when the supply air temperature is less than the dew-point temperature is given by
Humidity was analyzed as dew-point temperature. The net difference was 1.3 [+ or -] 0.4[degrees]F (0.7 [+ or -] 0.2[degrees]C), indicating a small but statistically significant increase in dew-point temperature in treatment homes.