2. An air-conditioned medical clinic is to be maintained at 24° C and 50% relative humidity. The loads are 20 kW sensible heat and 6 kW latent heat. The air mixture of return and outside air is at 27° C DB and 23°C WB temperatures is cooled to 17° C DB and 14°C WB temperatures by cooling coils to be the supply air to the clinic. Determine the TOR required.
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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%.A bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%. Calculate the followings: (a) Ventilation air required. (b) Sensible and latent heat gains due to occupants. (CLF = 0.86) (c) Volumetric flow rate of supply air if the supply temperature is 18°C.your A bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%. Calculate the followings: (a) Ventilation air required. (b) Sensible and latent heat gains due to occupants. (CLF = 0.86) (c) Volumetric flow rate of supply air if the supply temperature is 18°C. (d) Volumetric flow rate of moisture removed. (e) Sensible heat ratio of the theater. (f) Relative humidity of the supply air
- 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 AIRA bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%. Calculate the followings: (a) Volumetric flow rate of moisture removed. (b) Sensible heat ratio of the theater. (c) Relative humidity of the supply 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
- 4. A small auditorium is required to be maintained at 22 C dry bulb temperature and 70 % relative humidity. The ambient conditions are at 30 C dry bulb temperature and 75 % relative humidity. The amount of free air circulated is 200 m3/min. The required conditions are achieved by first cooling and dehumidifying through a cooling coil having apparatus dew point of 14 C and then by heating. With the help of psychrometric chart find. a) The capacity of the cooling coil intones of refrigeration and its by-pass factor. b) The amount of water vapour removed by the cooling coil in kg/h. c) The capacity of the heating coil in kW and its surface temperature. Assume by-pass factor as 0.2Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the cooler with a db-temperature of 18°C and a relative humidity of 100%. The outdoor air db-temperature is 35°C. The pressure is constant at 101.3 kPa. Determine (1) the db-temperature and relative humidity of the (ii) the outdoor relative humidity, and (iii) the mass flow rate of water. space,Q1: Moist air at 40°CDBT, 20°CWBT, and standard atmospheric pressure is humidified adiabatically to 25 CDBT and 70% RH. Find the amount of moisture and heat added per Kg of air. (answer without using of psychrometric chart). Q2: A room is to be maintained at 22°C db and 50%RH has total heat loss of 7.5 kW of which 80% is sensible heat, when outdoor at 5 °C and 80% RH. If the design difference between supply and room air temperature is 10°C DBT and 50% fresh air, find the capacities of heating coil, and humidifier used a tap water at 10 "C. Q3: A room is maintained at 22°C and 50%RH has a wall consist of common brick finished internally with gypsum plaster and externally with 15mm cement plaster. The outside conditions are 2°C, 75% RH. Find the thickness of common brick required for preventing moisture condenses on the wall.
- How high a relative humidity must be for a 35°C air in order to obtain a saturated air at 18°C by sensible cooling? How much heat is involved? Assume barometric pressure to standard.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.1. An air-conditioned space is maintained at 25 °C and 50% relative humidity. The outside conditions are 40 °C DBT and 25 °C WBT. The space has a sensible heat gain of 24.5 kW. The conditioned air is supplied to the space as saturated air at 10 °C. The equipment consists of an air washer such that the air entering to it comprises 25% outside air and the remainder being recirculated room air. Calculate: - A. The volume flow rate supplied to the space. B. The latent heat gain to the space. C. The cooling load of the air washer.