Fresh air at 21.1 C in which partial pressure of water vapor is 0.018 atmosphere is blown at the rate of 214 m3/h first through a preheater and then adiabatically saturated in spray chambers to 100% saturation and again reheated this reheated air has humidity of 0.024 kg water vapor per kg dry air. It is assumed that the fresh air and the air leaving the re-heater have the same percentage humidity. Determine:- a- The temperature of preheater, spray-chamber and re-heater b- Heat requirement for preheating and re-heating 11:39 م

Pls. Anwer my quistion.. Thank you! Air enters an air-conditioning system that uses refrigerant-134a at 30OC and 70 percent relative humidity at a rate of 4 m3 /min. The refrigerant enters the cooling section at 700 kPa with a quality of 20 percent and leaves as saturated vapor. The air is cooled to 20OC at a pressure of 1 atm. Determine  (a) the rate of dehumidification in kg/min  (b) the refrigerating Effect in KJ/min  (c) the mass flow rate of the refrigerant in kg/min

What is the temperature entering the cooling sectionwhen 25 kW of heat are removed and the air exits at 15 deg C, a relative humidity of 30% and a volumetric flowrate of 0.7 m^3/s?

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QUESTION 1 Water at 60°C leaving a condenser at the rate of 22.5kg/s is sprayed into a natural-draught cooling tower and leaves it at 27°C. Air enters the tower at 1.013bar, 13°C and 50% relative humidity and leaves it at 38°C, saturated. Take Cp for the superheated vapour as 1.86 kJ/kgK. Calculate: 1.1. the air flow rate required in m/s; 1.2. the make-up water required in kg/s.

A volumetric flow rate of 3750 m'h of outside air at 39 °C dry bulb and 26 °C wet bulb temperatures is to mixed with 8250 mh of return air at 25 °C and 50% rgative humidity before entering a cooling coil in an conditioning device. The mixture leaving the coil.at0% relative humidity is then supplied to the space sensible heat ratio of the conditioned space is 0.75) Sketch the process on the psychrometric chart and t the followings: a) The dry bulb temperature of the supply air. b) The cooling coil capacity, kW. c) The apparatus dew point and supply air dew.point temperatures. d) The sensible and latent heat loads of the space. e) The bypass factor of the cooling coil. The rate at which moisture is removed from air.

5. Dry winter atmospheric air at latm, 8°C and 50% bumidity enter an HVAC system at a rate of 10m/hr, where it is isobarically conditioned to 21°C, 50% humidity. A water line supplies saturated water vapour. Determine heating or cooling rate required to accomplish this process. Also determine the rate wat which water must be supplied in the system in KW. Take heat of vaporization of water to be 2539.9kJ/kg. Note IKJ/S = 1KW

What is amount of entropy generation "kJ/K" during the condensation of a 2.8 kg of a pure substance "latent heat of vaporization of 1024.04 kJ/kg.K, T 55 C" and the surroundings are at 30 C? sat

Moist air at 21 C° DBT and 15 C° WBT and standard atmospheric pressure is humid by water spray. If for each one kg of dry air passing through the duct 0.002 kg of wa 100 C° is injected and totally evaporated. Draw the psychometric and schematic figu process and calculate for the air leaving the a- The moisture content. spray chamber: b- The enthalpy c- Dry bulb temperature.