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- Which statement is TRUE about displacement ventilation in UFAD systems? air from the floor is prone to carrying dust vertical airflow may have health benefits mixing is enhanced resulting in even air temperatures supply air temperatures are lower than for overhead systemsIt is generally desirable to provide mechanical ventilation in all rooms of a building which are occupied by more than O a. 14 people O b.32 people Oc 50 people O d. 28 people The most expensive filters used in air conditioning system are O a. Electric precipitators O b. Spray washers O c Dry filters O d. Viscous filtersSpecify an acceptable amount of outdoor air for ventilation of the following: a) 12 ft by 12 ft private office with 8 ft high walls - ANS: 13.6 cfm b) department store with 20,000 ft^2 of floor area - ANS: 4,650 cfm
- 15. A room dimensions 10 x 8 x 3 m is maintained at 22 °C and 50% RH and has a total heating load of 12 kW. The room is provided with eight air changes per hour when ambient conditions are 32°C and 60% RH. Determine; a. Total cooling load; b. Moisture removed per hour; c. Minimum diameter of the fresh air duct so that the velocity in the duct does not exceed 3 m/s.A room is to be maintained at 25°C dry bulb temperature and 55% relative humidity under the following conditions: the outdoor conditions (34°C DBT and 30°C WBT); Sensible and latent heat load of the persons and infiltration in the room are 5100 W and 3400 W respectively; the air is 1250 m/h and the mass of the fresh air is 5000 kg/h. (Take SHG for glass and light 2300 W and 1.2 kW respectively). By using psychometric chart, calculate: (a) the sensible heat factor. (b) Grand total heat. (Where: DBT= Dry Bulb Temp. ;WBT=Wet Bulb Temp. ; and SHG-Sensible Heat Gain)QUESTION 1 Compute the resulting pressure in kPa after a "real" diffuser in which the energy loss due to sudden enlargement is considered for the flow of water at 25°C from a 36 mm OD x 2.0 mm wall copper tube to an 85 mm OD x 2.5 mm wall copper tube, the pipes are the same elevation. The volume flow rate is 150 L/min and the pressure before the enlargement is 501.448 kPa.
- An auditorium is 100m in length, 70m in width, and 20m in height. It is ventilated by a system that feeds in fresh air and draws out air at the same rate. Assume that airborne impurities form a well-stirred mixture. The ventilation system is required to reduce air pollutants present at any instant to 1% of their original concentration in 30 min. What inflow (and outflow) rate is required? What fraction of the total auditorium air volume must be vented per minute?are maintained at uniform temperatures of 300°C and 4 cm Tem 5 cm 10cm hem 100°C,respectively. Determine the rate of heat transfer through the wall and draw the thermal circuit. Q2) A double-pipe counter flow heat exchanger is to coo! ethylene glycol (Cp-2560J/kg.°C) flowing at a rate of 3.5 kg/s from 80°C to 40C by water (Cp-4180J/kg.°C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is Celd water 20C Hot glycel 250W/m2.°C. Determine: 15gs (a) The rate of heat transfer. (b) The mass flow rate of water. (c) The heat transfer surface area on the inner side of the tube. Q3) A(10 m) long section of a 0.05m diameter horizontal hot water pipe passes through a large room whose temperature is 22°C. If the temperature of the outer surface of the pipe is 65°C, determine the rate of heat loss from the pipe by natural convection? The properties of air at 43.5°C is k = 0.02688 W/m.°C, u = 1.735 10 m /s, Pr = 0.7245.…Compute the resulting pressure in kPa after a "real" diffuser in which the energy loss due to sudden enlargement is considered for the flow of water at 25°C from a 36 mm OD x 2.0 mm wall copper tube to an 85 mm OD x 2.5 mm wall copper tube, the pipes are the same elevation. The volume flow rate is 150 L/min and the pressure before the enlargement is 515.004 kPa. NB: OD = Outside Diameter, Wall refers to the pipe’s thickness (t) Hints: Obtain the specific weight of water for the given temperature from Appendix A (Table A.1). Obtain the resistance coefficient (K) for sudden enlargement from Table 10.3B in chapter 10. Instructions: Only express the areas in scientific notation to three decimal places but round off to three decimal places in normal number format where necessary throughout your calculations leading to the final answer and including the final answer for all other computations excluding the area.
- 7.13 A small parts assembly area in a factory has a working force of 25 men and occupies a space 27.4 by 9.1 mwith a 3 m ceiling. Smoking is not allowed. Determinea. Sensible heat load from the occupantsb. Latent heat load from the occupantsc. Moisture added from the occupantsd. The minimum volume of outdoor air for ventilatione. Suitable summer design inside dry-bulb temperatureSanitary Engineering laboratory the test " Relative Humidity of Air" help meFor an air-conditioning system, the outdoor and indoor design dry bulb temperatures are 45°C and 25°C respectively. The space to be air-conditioned Is 20m x 30m x 5m and infiltration is estimated to be one alr are 1.2 (kg of dry air)/m³ and 1.02 kJ/(kg of dry air) °C, then the sensible heat load due to Infiltration is, nearly