b) An inventor designed a cooling device with an efficiency coefficient of 8.5 between -10°C indoor temperature and 25°C room temperature. He claims to be running his machine. Could this claim be true? Why?
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- An 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.12. A classroom type room with 45students taking an exam in thermodynamics is expected to release a body heat of about 8kJ/hr per person. In order to compensate this heat dissipation, an air- conditioning unit is to be installed. If specific heat capacity and density of air is 1.0062kJ/kg-K and 1.21kg/m3, determine the volume of air flow required in examination room if the air is to be cooled down from 29°C to 20°C. a. 8.5177Li/s b. 9.1262Li/s c. 9.2022Li/s d. 9.0501Li/sAn 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.
- Air enters a cooling coil at the rate of 5000 cfm (2.4 m3/s) at 80 F (27 C). db, 68 F (20 C) wb and sea-level pressure. The air leaves the coil at 55 F (13 C) db, 54 F (12 C) wb. (a) Determine the SHF and the apparatus dew point. (b) Compute the total and sensible heat transfer rates from the air.EXAMPLE 5: 1.5 m 3 s -1 of moist air at a state of 28C dry-bulb, 20.6C wet-bulb (sling) and 101.325 kPa flows across a cooler coil and leaves the coil at 12.5C dry-bulb and 8.336 g per kg of dry air. Determine (a) the apparatus dew point, (b) the contact factor and (c) the cooling load.An ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 1. Draw the PH diagram indicating the temperatures, enthalpies, and initial specific volume 2. Refrigerating effect in kj/kg 3. mass flow rate in kg/s 4. work of compressor in kj/kg 5. power of compressor in kj/kg 6. cooling coefficient of performance 7. piston displacement in cu. meters/min 8. bore in mm 9. stroke in m 10. motor rpm
- An ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 1.Draw the PH diagram indicating the temperatures, enthalpies, and initial specific volume 2. Refrigerating effect in kj/kg 3. mass flow rate in kg/s 4. work of compressor in kj/kgIs induced draft cooling tower a type of evaporative cooling tower? Subject : Heat Transfer1. A variable-air-volume cooling system delivers air to a controlled space maintained at 24 C db and 17 C wb. Under design conditions, the total cooling load is 60 kW with a sensible heat factor of 0.60, and the supply air temperature is 16 C db. At minimum load, about 7.5 kW with SHF of 0.80, the air quantity may be reduced no more than 75% by volume of the full load design value. Calculate the minimum volume of air to be supplied to the space at minimum load, cu.m/min.
- b.) A variable-air-volume cooling system delivers air to a controlled space maintained at 24 C db and 17 C wb. Under design conditions, the total cooling load is 60 kW with a sensible heat factor of 0.60, and the supply air temperature is 16 C db. At minimum load, about 7.5 kW with SHF of 0.80, the air quantity may be reduced no more than 75% by volume of the full load design value. Determine the supply air conditions for minimum load (state dry bulb temperature and wet bulb temperature, both in degree C).Please answer and will surely give an upvote. Thank you. 8. 1.5 m3/s of moist air at a state of 28℃ DB, 21℃ WB, and 101.325 kPa flows across a cooler coil and leaves at 12.5℃ DB and 0.0083 kg/kg d.a. Determine the following: a. The apparatus dew-point temperature in ℃ using the Psychrometric chart. b. The By-Pass factor in percentile (%) c. The cooling load of the process in kilowatts (kW)discuss the effect of the property below in relation to SENSIBLE COOLING process. What if the cooling process is below its dew point temperature?