Relative humidity and humidity ratio question. 2 - Eng-Tips
2006年4月28日 · humidity ratio is the gr/lb or lb/lb number that you are talking about (both the same number just different units). its a measure of mass of moisture per mass of dry air. relative humidity is technically the ratio of partial pressure of water vapor to the partial pressure of water vapor at saturation. however, assuming an ideal gas you can use ...
find temp knowing the humidity ratio and enthalpy - Eng-Tips
2011年11月8日 · RE: find temp knowing the humidity ratio and enthalpy MattyWaste (Mechanical) 8 Nov 11 21:46 dry bulb temp of 70 with a 50% RH means your wet bulb temp is about 58.5 and enthalpy is 25.33 btu/lb
Turning wet and dry bulb temperatures to Humidity and dew point 2
2010年6月4日 · e. W (Humidity Ratio) No for example given with following Alt = 10m DB = 25 C WB = 16 C You need to calculate the Dew Point (DP) here is how you need to write the formula =psychro(15,25,16,"WB","DP") Finished ... Enjoy Note: Instead of direct value input in the formula you can also give the cell referrences of these three inputs
Evaporative cooler that cools below wetbulb temperature
2017年4月11日 · DB/21C WB corresponding to a humidity ratio of 8 g/kg. Cooling has taken place along a constant humidity ratio line with the final delivered air condition of 16C DB/13C WB and the humidity ratio still 8 g/kg. Note that the final delivered temperature is actually below the entering Wet Bulb temperature, resulting in a wet bulb effectiveness of ...
Metric Conversion Question - HVAC/R engineering - Eng-Tips
2013年3月4日 · Air flowing in a duct has dry and wet bulb temperatures of 78F (25.6C) and 65F (18.3C), respectively. Use Psychrometric charts in English units (chart 1a) and SI unirs (1b) attached to find enthalpy,specific volume, humidity ratio and relative humidity in English and SI units. I found these points on the attached charts.
Humidity Issue - HVAC/R engineering - Eng-Tips
2013年1月17日 · It's going to be related to the current outdoor air temperature though, so a "safe" humidity ratio at one indoor/outdoor temperature combination might not be safe at other temperatures. The University of Minnesota developed a chart for corresponding indoor humidity ratio to outdoor temperature, assuming an indoor temperature of 70F and ...
Cold Room Humidity - HVAC/R engineering | Eng-Tips
2009年5月5日 · From the ASHRAE Refrigeration, chapter 42, very high RH (about 90%) a TD of 8 to 10 is used. High humidity (approx. 80%) would run a TD of 10-12. Medium humidity (75%) a TD of 12 to 16 is recommended. The Heatcraft manual continues for …
Off-coil temperature and airflow effect on total cooling capacity
2021年10月5日 · Since the air is leaving from the cooling coil as saturated condition (if not using reheat electrical coil or heat pipe), it will increase the RH though the unit decreasing the humidity ratio, Also, look at the chilled water circuit, there gradually decreasing the capacity because delta T across the unit is decreasing.
Relative Humidity wet gas stream HYSYS - Eng-Tips
2010年9月17日 · I presume you mean the relative humidity defined as the ratio of the partial pressure of water vapor in the mixture to that of saturated vapor pressure of water at a prescribed temperature, knowing operating temperature and water saturation pressure and water content/fugacity in the mixture (I use tools as Prode and REFPROP for these calc's) it is easy …
Calculate Drying Time of Nylon Parachutes - Heat Transfer ...
2017年2月11日 · And x is the humidity ratio of 0.4% MCDB air heated to 120 F, as taken off the psychrometric? [0.4% MCDB 80.2 at 76.0 DP] Based on an estimated exposed area of 43.8 m[sup]2[/sup] per chute (3 ft dia x 50 ft length), a velocity of 0.02 m/s, a humidity ratio of saturated air of 0.08 and a humidity ratio of air at 0.017, I got 70 kg/hr of evaporation.