Temperature dew-point

Because of their ordered stmcture, molecular sieves have high capacity at low water concentrations and do not exhibit a capiHary condensation pore-filling mechanism at high water concentrations. The desiccating properties of the material are stiU good at elevated temperatures (Fig. 10). A dew point of —75° C can be obtained in a gas dried at 90°C with a molecular sieve that adsorbs water to the level of 1 wt %. In normal operations at ambient temperature, dew points of < — 100° C have been measured. 

Water vapour max all temperatures dew point —25 to + 20°C below 750°C above 750°C No attack Oxidises... 

Figure 7-2 shows the vertical profiles of temperature, dew point, light scattering (a measure of aerosol concentration) and the concentrations of O3 and SO2. Here we see that up to about 1.5 km, the temperature, dew point, light scattering... 

Fig. 7-2 Vertical profiles of physical (temperature, dew point, and backscatter coefficient) and chemical (ozone, sulfur dioxide) variables near Scranton, PA during the afternoon of 20 July 1978. (Modified with permission from P. K. Mueller and G. M. Hidy (1982). "The Sulfate Regional Documentation of SURE Sampling Sites", EPRI report EA-1901, v. 3, Electric Power Research Institute.)...

The top and bottom temperatures (dew points and bubble points) were calculated by the methods illustrated in Example 11.9. Relative volatilities are given by equation 8.30 ... 

FIGURE 4-14 Vertical temperature, dew point, and ozone sounding for operation 14, Glendale, California, O ober 4,1973,1 01-1 25 p.m. Re wn from Edinger. ... 

The mechanism that causes this often severe flow maldistribution is based on low-temperature dew-point corrosion, as explained below. Here is a rather common example, assuming that the main corrodants are chlorides, in a hydrogen sulfide-rich, condensing hydrocarbon vapor ... 

Another frequently used unit is dew point (saturation) or wet-bulb temperature. Dew point is the saturation temperature of a gas-water vapor mixture (the temperature at which water condenses as the gas is cooled). Finally, moisture is also expressed in volume or mass ratio as parts per million (ppm) volume or weight. 

Fluid bed drying Inlet air volume, temperature, dew point Granule size and distribution... 

The AirQUIS model runs with input from MM5 (Berge et al. 2002) in 1-h time resolution. The transferred 2D surface parameters are precipitation, total cloud cover, mixing height and surface temperature. 2D parameters from lowest model level are the air temperature, dew point, relative humidity, and vertical temperature... 

YOURSELF the absolute humidity, wet-bulb temperature, dew point, humid volume, and specific enthalpy... 

See also Air masses and fronts Atmosphere observation Atmosphere, composition and structure Atmospheric circulation Atmospheric temperature Dew point Fog Greenhouse effect Hydrologic cycle Weather forecasting Weather mapping Weather modification Wind chill Wind shear. 

Cloud cover, surface wind direction and speed, temperature, dew point, and precipitation are indicated by symbols at each weather reporting station. Interpretation of the weather in a region is facilitated by the identification of high-pressure and low-pressure areas, the delineation of frontal systems, and the construction of isobars. Isobars are lines of constant atmospheric pressure that are interpolated between observation points, and are so named because pressure often is presented using the unit of the bar, which is equivalent to 106 dyn/cm2 or 0.9869 atm. On some maps, such as shown in Fig. 4-21, pressure is given in millibars as a shorthand notation, only the last two digits are presented. The user must add either 900 or 1000 millibars to the value shown, whichever brings the value closest to 1 bar. 

Comfort is influenced by temperature, humidity, air velocity, radiant heat, clothing, and work intensity. Psychological factors may mso influence comfort, but their discussion is beyond the scope of this handbook. The reader is referred to Chap. 42 of the HVAC Applications volume of the A.S.H.R.A.E. Handbooks for a full discussion of the control of noise, which must also be considered in air-conditioning design. Figure 5 in Chap. 8 of the HVAC Fundamentals volume of the A.S.H.R.A.E. Handbooks relates the variables of ambient temperature, dew point temperature (or humidity ratio) to comfort under clothing and activity conditions typical for office space occupancy. It also shows boundary values for ET, the effective temperature index. This index combines temperature and moisture conditions into a... 

It is Eqs. 10.3-5 and 10.3-6 that are used in the algorithm of Fig. 10.3-5. Computer programs and MATHCAD worksheets for bubble point temperature, bubble point pressure, dew point temperature, dew point pressure, and isothermal flash calculations using the Peng-Robinson equation of state with generalized parameters (Eqs. 6.7-1 to... 

The calculations of absolute humidity, relative humidity, wet-bulb temperature, dew-point temperature, humid volume, humid heat, and humid enthalpy are based on information found in Pakowski and Mujumdar (2006) and Moyers and Baldwin (1997). 

Minimum molding temperature Barrel temperature c Mold temperature X Allowable moisture content % Drying time and temperature (Dew point... 

De-freezing Minimum temperature (dew point) to be reached before unwrapping or minimum storage time at room temperature before unwrapping logging of temperature history... 

Here, the region to the right of the vapour pressure curve represents the gaseous state. To the left side of the curve, the substance is liquid or solid. In the condition described by the curve liquid and saturated vapour coexist in equilibrium. When the temperature of an unsaturated (superheated) vapour is reduced, condensation starts at the saturation temperature (dew point temperature) corresponding to the actual vapour pressure. 

Source or sink term or consumption rate of gas species Specific entropy or entropy per unit mass or adsorption cross section of the adsorbing species Molar specific entropy Absolute entropy Change of entropy Change in absolute entropy Temperature High temperature Low temperature Dew point temperature Temperature of product of combustion Saturation temperature Critical temperature Reduced temperature Temperature at inlet of gas channel... 

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