ASHRAE PSYCHROMETRIC CHART NO.1 ASHRAE NORMAL TEMPERATURE BAROMETRIC PRESSURE COPYRIGHT 1992 SEA LEVEL 101.325 kPa AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. SENSIBLE TOTAL P 80 ENTHALPY HUMIDITY RATIO 40. 50. ENTHALPY 20 SATURATION TEMPERATURE C 90 100 30 DeW 10% RELATIVE HUMIDITY 10 20 30 DRY-BULB TEMPERATURE, "C 40 /PSICORUMETRIC CHARI 120 22 110 20 100 50 80

Q2) Air is supplied to an automobile cabin from the outside, where the temperature is 20F and the relative humidity is 70%. It is desired to keep the cabin at 70F and Ø = 60%. Hoe many pounds of water must be supplied to each pound of air entering the car cabin if these conditions are to be met? The barometric pressure is 29.5 in.Hg. %3D Ans. (0.00797 lbs/Ibdry air)

ASHRAE standard 55, Thermal Environmental Conditions for Human Occupancy, notes that for thermal comfort purposes, the indoor temperature should range from approximately 67ºF to 82°F (19.4ºC to 27.8ºC), and systems designed to control humidity must be able to maintain a dew-point temperature of 16.8°C (62.2°F). ASHRAE standard 62.1, Ventilation and Acceptable Indoor Air Quality, recommends that relative humidity in occupied spaces be controlled to less than 65% to reduce the likelihood of conditions that can lead to microbial growth. Determine the minimum allowable indoor temperature that will ensure a humidity control system designed according to ASHRAE standard 55 will also satisfy the humidity requirements of standard 62.1

In regards to a cooling tower practical, the values in the table below are what I have found from the psychometric chart but I was wondering using this how would I be able to determine the following parameters for each load case:  Relative humidity of inlet air and outlet air Humidity ratio of inlet and outlet air Enthalpy of inlet and outlet air  Specific volume of inlet and outlet air

RH2 = 43% What is the specific humidity of the air stream #1, w1 (lbm H2O/lbm air)? What is the specific humidity of the air stream #2, w2 (lbm H2O/lbm air)? What is mass flow rate of dry air in stream #1 (lbm/s)? What is mass flow rate of dry air in stream #2 (lbm/s)? What is the relative humidity of the outlet (%)?

T₁ = 10°C $₁ = 30% V₁ = 45 m³/min 10°C Heating coils Air T₂ = 22°C 2 Celllllll3= 25°C = 60% $1 = 30% Humidifier 22°C %09 = 50 AN EXAMPLE The amount of heat and mass at each point along with the properties of the air? 25°C I need a clear answer by hand, not by keyboard and fast answer within 20 minutes. Thank you | dybala 17

The dry bulb of a wet/dry thermometer reads 120°F. What is the relative humidity if the wet bulb reads (a) 90°F, (b) 82°F, (c) 75°F?

Exercise 17.6 Air at 20°C and 60% relative humidity is heated to 90°C and then enters a continuous dryer in an adiabatic operation. The air exits at 40 °C. Calculate: a) the inlet volumetric flow rate of air required to remove 20 kg of water/h from the product and b) the required energy to heat the air.

A dry bulb thermometer reads 30 degrees of celsius and wet bulb thermometer reads 24 degree of celsius. What is the relative humidity?

Suppose the relative humidity of the air was 96 % on a cold morning when the temperature was 20°C. In the afternoon, the air temperature has risen to 35°C, but the actual amount of water vapour in the air is the same as it was in the morning. What is the approximate relative humidity in the afternoon?|