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- The recommended relative humidity for a home is between A. 500/0 and 70%. B. and 40%. C. and 50%. D. and 60%.In an auditorium a temperature should not exceed 23 deg C and 55% relative humidity, total occupancy is 150 people with 17 air change per person and a sensible heat of 132 kW. Air is to be supplied at the auditorium at 18 dec C. How many cfm of air must be supplied?Pls. Answer thank you! A 95°F dry bulb, 75°F wet bulb air passes through a cooling tower and leaves at 85°F dry bulb and 90% relative humidity. The enthalpy change per cubic foot of air is most nearly?
- Air at 24 °C dry-bulg and 15 °C wet-bulb enters a humidifier and leaves at 41 °C dry-bulb and 21 °C wet-bulb. How much moisture has been added per kilogram of dry air?A moist air sample has dry bulb temperature of 30°C and specific humidity of 11.5 g water vapour per kg dry air Assume molecular weight of air as 28.93 . If the saturation vapour pressure of water at 30°C is 4.24 kPa and the total pressure is 90 kPa, then the relative humidity (in %) of air sample is, (a) 50.5 (b) 38.5 (c) 56.5 (d) 68.5Moist air exists at a dew point temperature of 18°C, 60% RH, and a pressure of 96.5 kPa. Determine the humidity ratio and specific volume.
- In single duct air conditioning system, the 1.5 kg/s of outlet air at -4C db, 80% RH mixes with 4.5 kg/s of the return air at 20C db, 50% RH. The mixture air heated to 35C db and humidified to 19C db. Draw the processes on the psychrometric chart, then find: 1. Heating coil capacity. 2. Quantity of the moisture.( Handwritten Sol) The air in a house is at 19°C, 59% relative humidity, and total pressure 89kPa. If air is cooled at constant pressure, the temperature at which moisture begins to codense is:Moist air initially at standard atmospheric pressure, 15°C db, 70% relative humidity undergoes a sensible heating process until the dry bulb temperature is 29°C. For a moist air mass flow rate of 9.9 kg/s, what is the heat transfer for this process? Express your answer in kW.
- Solve all please i give thumb up? Outside air at 15°C and 20% relative humidity is admitted at a volumetric rate of 15m³/min into an air conditioning system composed of a simple heating section followed by a humidification section, which must supply air at 27 °C and 65% relative humidity. The airflow temperature between the heating and humidifying sections is 22°C and the entire air conditioner operates at 70kPa. Determine, using calculations: (a) the rate of heat supply to the heating section, in kW, is ______. (b) the wet bulb temperature of the air after the heating section, in °C, is ______. (c) the mass flow rate of steam in the humidification section, in g/s, is ______. (d) the temperature of the steam injected into the humidification section for a steam pressure of 200kPa, in °C, is _______The standard design conditions for air-conditioning systemsestablished by the Air-Conditioning, Heating andRefrigeration Institute (AHRI) are outside temperature______°F, inside temperature ______°F, with a humidityof ______%.Gas-Vapor Mixtures (Properties of atmospheric air)Find the humidity ratio of an air that has tdb = 29 °C with a relative humidity of 55%. (Use PB = 100 KPa)