An air-conditioning plant is designed to maintain a room at a condition of 20oC dry bulb...

An air-conditioning plant is designed to maintain a room at a condition of 20oC dry bulb and specific humidity 0.0079 when the outside condition is 30oC dry bulb and 40% percentage saturation and the corresponding heat gains are 18000 W (sensible) and 3600 (latent). The supply air contains one-third outside air by mass and the supply temperature is to be 15oC dry bulb. The plant consists of a mixing chamber for fresh and recirculated air, an air washer with chilled spray water with an efficiency of 80%, an after heater battery and supply fan. Neglecting temperature changes in fan and ducting, calculate:
a. The mass flow rat of supply air necessary;
b. The specific humidity of the supply air;
c. The cooling duty of the washer;
d. The heating duty of the after heater
(use the psychrometric chart assuming the barometric pressure is 1.001325 bar)

Expert Solution

samet mamat answered 1 year ago

The air in a room has a pressure of 1 atm, a dry-bulb temperature of 24°C,...

The air in a room has a pressure of 1 atm, a dry-bulb temperature of 24°C, and a wetbulb temperature of 17°C. Using the psychrometric chart, determine (a) The specific humidity, (b) The enthalpy, in kJ/kg dry air, (c) The relative humidity, (d) The dew-point temperature, and (e) The specific volume of the air, in m3/kg dry air.

It is required to maintain the air in a building at 20oC and 40% saturation when...

It is required to maintain the air in a building at 20oC and 40% saturation when the outside conditions are 28oC, 50% saturation with a barometric pressure of 1.01325 bar. The total heat gains to the room (sensible plus latent) are 15 kW, and the latent heat gains are 3 kW. There is no reciculation and the fresh air passes over a cooling coil to dehumidify it, and then a heater, before entering the room. The cooling coil by pass...

Air with a dry bulb temperature 75 F and a wet bulb temperature 65 F is...

Air with a dry bulb temperature 75 F and a wet bulb temperature 65 F is at a sea level pressure of 14.7 psia. Using equations to calculate (a) humidity ratio, (b) the relative humidity of the air, (c) enthalpy, (d) dew point, and (e) the mass density of the dry air. (50)

An air conditioning company servicing a certain machine room guarantees that the temperature in the room...

An air conditioning company servicing a certain machine room guarantees that the temperature in the room stays below 20o C. Due to malfunctioning of the equipment operating in the machine room, it is suspected that the average temperature actually exceeds 20o for more or less extended periods of time. Seven temperature measurements are collected throughout the day and the following temperatures are observed, 20.8, 20.2, 20.9, 21.5, 22.2, 21.2, 19.8. Assuming that the temperature is at least approximately normally distributed,...

In an air-conditioning system, dry air flows over tubes carrying refrigerant R134a. The air is cooled...

In an air-conditioning system, dry air flows over tubes carrying refrigerant R134a. The air is cooled by transferring heat to the R134a; the air enters with a volume flow rate of 0.75 m3 s–1 at 305 K and 100 kPa, and it exits at 290 K and 95 kPa. The R134a enters at 4 bar in a vapor-liquid coexistence state with a quality of 20%; it exits at 4 bar and 30 °C. Ignoring heat transfer at the outer surface...

In an industrial process, it is required to maintain 30°C dry bulb temperature with high relative...

In an industrial process, it is required to maintain 30°C dry bulb temperature with high relative humidity equals to 60%. Determine the following air properties when the barometric pressure is standard, a) Dew point temperature; b) Specific humidity; c) Enthalpy of mixture per kg of dry air. d) Vapour density; e) Degree of saturation; f) Wet bulb temperature.

An air conditioning manufacturer produces room air conditioners at plants in Houston, Phoenix, and Memphis. These...

An air conditioning manufacturer produces room air conditioners at plants in Houston, Phoenix, and Memphis. These are sent to regional distributors in Dallas, Atlanta, and Denver. The shipping costs vary, and the company would like to find the least-cost way to meet the demands at each of the distribution centers. Dallas needs to receive 800 air conditioners per month, Atlanta needs 600, and Denver needs 200. Houston has 850 air conditioners available each month, Phoenix has 650, and Memphis has...

Allen Air Conditioning manufactures room air conditioners at plants in Houston?, Phoenix?, and Memphis. These are...

Allen Air Conditioning manufactures room air conditioners at plants in Houston?, Phoenix?, and Memphis. These are sent to regional distributors in Dallas?, Atlanta?, and Denver. The shipping costs? vary, and the company would like to find the least cost way to meet the demands at each of the distribution centers.??Dallas needs to receive 800 air conditioners per? month, Atlanta needs 500?, and Denver needs 350. Houston has 850 air conditioners available each? month, Phoenix has 650?, and Memphis has 300....

Air entering a dryer has a temperature (dry bulb) of 60°C and a dew point of...

Air entering a dryer has a temperature (dry bulb) of 60°C and a dew point of 26.7°C. Using the humidity chart, determine the actual humidity H, percentage humidity HP, humid heat cS and humid volume vH.

The dry and wet-bulb temperatures of atmospheric air at 95 kPa are 25C and 20C, respectively....

The dry and wet-bulb temperatures of atmospheric air at 95 kPa are 25C and 20C, respectively. Determine (a) the specific humidity, (b) the relative humidity), and (c) the enthalpy of the air in kj/kg dry air.

Question