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Using M-15 filter media and the requirement of 60 cfm per person of outdoor air for the case of a designated smoking area for 53 persons, design a filter and air-circulation system allowing the actual outdoor air rate to be reduced to 20 cfm per person. Assume outdoor and recirculated air are mixed before filtering and insignificant amounts of outdoor air contaminants are present. The filter media must have a gravimetric efficiency of 80 percent in the
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Heating Ventilating and Air Conditioning: Analysis and Design
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- Q.1 An air conditioning system supplying air to a space with a sensible heat load of 14 kW and a latent heat load of 9 kW has a cooling coil and a bypass path as shown schematically in Fig. The db- temperature of the space is maintained at 26°C. The dry air mass flow rate of supply air is 1.2kg/s. Outdoor ventilation air at 34°C db-temperature and 50% relative humidity is introduced into the system with a dry air mass flow rate of 0.26 kg/s. The air leaving the cooling coil is fully saturated at a db-temperature of 6°C. The pressure is constant at 101.3 kPa. Determine db-temperature and relative humidity of the supply air to the space, (ii) (i) (ii) (iv) wb-temperature of the space, temperature of the air entering the cooling coil, and refrigeration capacity of the cooling coil.arrow_forwardAn auditorium to be air-conditioned for the following conditions, Outdoor dry-bulb temperature 40 °C Outdoor wet-bulb temperature 20°C Expected comfort condition 20 DBT 60%RH Seating capacity of the auditorium 1500 persons Air supplied from outdoor 0.3 m¥min per person fthe required condition is achieved first by adiabatic humidification and then by cooling, determine () the capacity of the cooling coil in tonnes and (i) the capacity of humidifier in kg/h.arrow_forwardA spray drier is used to dry skim milk to a final moisture content of 5.00%. The air entering the drier is 110°C, is heated from ambient air at 26.0°C and 80.0% RH. The flow rate of hot air entering the dryer is 1000 m3 dry air/min. The skim milk enters the dryer at 45.0°C with 55.0% moisture content and the exit temperature is 55.0°C. The specific heat of product solids is 2.00 kJ/kg dry solid-°C. The heated air leaves the system at 5.00°C above the product temperature. Determine: a. the %RH of air leaving the dryer; and b. the production rate of the moist product leaving the dryer. (Note: Obtain necessary properties of air using the psychrometric chart given to you; All moisture content is on wet basis)arrow_forward
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- A furnace heating unit has an airflow of 2,500 CFM. The heating coil entering temperature is 35°F dry bulb temperature with a relative humidity of 30%. the furnace heating coil leaving temperature is 80°F dry bulb temperature. Plot the points and the process line on the psychrometric chart. Find the sensible, latent, and total loads of the coil. (hint: heating does not change the moisture content in the air) OUTSIDE AIR 2,500 CFM 35°F DRY BULB TEMP. 30% RELATIVE HUMIDITY FURNACE 80°F DRY BULB TEMP. 2 SUPPLY AIRarrow_forwardAn auditorium to be air-conditioned for the following conditions, Outdoor dry-bulb temperature 40 °C Outdoor wet-bulb temperature 20°C Expected comfort condition 20 DBT 60%RH Seating capacity of the auditorium 1500 persons Air supplied from outdoor 0.3 m¥min per person f the required condition is achieved first by adibatic humidification and then by cooling, determine () the capacity of the cooling coil in tonnes and (i) the capacity of humidifier in kg/h.arrow_forwardWhile evaluating the performance of a boiler it is observed from flue-gas analysis that %02 content of flue gases entering and leaving a rotary air heater are 7.0% and 10.5%, respectively. Determine the percentage infiltration of ambient air.arrow_forward
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