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Consider a space heating system designed as shown in Fig. 3-21. The total space heating load is 500,000 Btufhr (145 kW), and the space design conditions are 70 F (21 C) and 30 percent relative humidity (RH). Outdoor air enters the preheat coil at 6 F
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Heating Ventilating and Air Conditioning: Analysis and Design
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- A dryer is to deliver 1000 kg/hour of palay with a final moisture content of 10%. The initial moisture content in the feed is 15% at atmospheric condition with 32°C dry bulb and 21°C wet bulb. The dryer operates adiabatically while the relative humidity of the hot humid air from the dryer is 80%. If the steam pressure supplied to the heater is 2 MPaa, determine the following, show solution in an orderly manner and select the best answer: 1) amount of palay supplied to the dryer in kg/hour а. 14,192 b. 13,980 c. 13,332 d. 13,679 2) amount of air supplied to the dryer in kg/hour а. 1039 b. 1059 c. 1079 d. 1000 3) temperature of the hot humid air from the dryer а. 29.3 b. 26.3 с. 20.3 d. 23.3arrow_forwardAn assembly hall was to have an air conditioning unit installed which would be maintained at 24°C dry bulb and at 50% Relative humidity. The unit delivers air at 14°C dry bulb and the calculated sensible heat load is 140 kW and the latent heat load is 50 kW. Twenty five percent by weight of extracted air is made up of outside air at 32°C dry bulb and 18°C welt bulb temperatures while 75% is extracted by the air conditioner from the assembly hall. The atmospheric pressure is 100 kPa and Rair is 287.08 j/kg-k. Using Psychrometric chart determine; a. The mass of circulating air b. The amount of moisture pick-up in the space c. The capacity of the supply fan d. The air conditioning refrigeration capacity in TOR e. The dry bulb temperature entering the air conditionarrow_forwardI need the answer as soon as possiblearrow_forward
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- QI: An air conditioning system is used to keep indoor condition of 24°C and 50% relative humidity inside a space as shown in Figure 1. An amount of 75% of returned air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before entering to the air filter. The air is cooled though the air cooling coil of surface effective temperature (apparatus dew point temperature) equals to 10°C and bypass factor is 0.2. Find the following: a. State of air after mixing (point m). b. State of air at coil outlet (point c). c. Sketch the process on the psychometric chart. d. Sensible heat factor of the space. space exhaust (25%) cooling coil filter fan m fresh air (25%) Figure 1arrow_forward14-121 A laboratory has a volume of 700 m' and must have one complete air change per minute when being used. Outside atmospheric air at 100 kPa, 30°C dry bulb, and 60 percent rela- tive humidity is ducted into the laboratory air-conditioning equipment and conditioned to 20°C dry bulb and 12°C wet bulb, the required state for air supplied to the laboratory. (a) Sketch the system hardware and the psychrometric diagram for the process. (b) What outside atmospheric air mass flow rate is required for the air change, in kg/h? (c) Determine the mass flow rate of water condensed from the atmospheric air, in kg/min. (d) The cooling fluid in the air-conditioning system is chilled water, which has a 15°C temperature rise during the heat exchange process. Determine the chilled water mass flow rate, in kg/min.arrow_forwardRequired information Problem 14.108 - Cooling Tower Assessment NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. The cooling water from the condenser of a power plant enters a wet cooling tower at 40°C at a rate of 91 kg/s. The water is cooled to 25°C in the cooling tower by air that enters the tower at 1 atm, 23°C, and 60 percent relative humidity and leaves saturated at 32°C. Neglect the power input to the fan. Use data from the psychrometric chart and tables. Problem 14.108.a - Cooling Tower Assessment Determine the volume flow rate of air into the cooling tower. m³/s. The volume flow rate of air isarrow_forward
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