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- The function of the pressure tank in an open-loop, geo-thermal heat pump well system is to prevent the well pump from _____.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.Consider a large classroom on a hot summer day with 150 students, each dissipating 60 W of sensible heat. All the lights, with 6.0 kW of rated power, are kept on. The room has no external walls, and thus heat gain through the walls and the roof is negligible. Chilled air is available at 15°C, and the temperature of the return air is not to exceed 25°C. Determine the required flow rate of air, in kg/s, that needs to be supplied to the room to keep the average temperature of the room constant.
- 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/sb.) 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).An auditorium is to be maintained at a temperature of 26°C DBT and 50% RH. Air is to be supplied at a temperature not lower than 15°C DBT. The sensible heat gain is 110kW and the latent heat gain is 37.5 kW. Take the outdoor ventilating air as 25% by weight of the air from the room (meaning 75% of the airconditioned supply air is recirculated) and is at 35°C DBT and 60% RH. Determine the refrigerating load in Tons of Refrigeration (TR).
- The winter air conditioning system has a preheat coil, an air washer, and a reheat coil as processing units. It supplies air at 38°C db-temperature to a space maintained at 21°C db-temperature and 13°C wb-temperature. The sensible and latent heat loads on the space are 50 kW and 25 kW, respectively. Of the return air from the space, 40% by dry air mass is discharged to the ambient and replaced with fresh outdoor air at 2°C db-temperature and 95% relative humidity. In the preheater, the air is heated to a db-temperature of 21°C. Assume that the water added in the air washer is at the wb-temperature of the air entering it. The pressure is constant at 95 kPa. Determine:The mass flow rate of supply air in kg/s.The rate of heat input in the preheat coil in kW.The mass flow rate of water sprayed in the air washer in kg/s.A surface condenser serving 50,000 kW steam turbo-generator unit receives exhaust steam at the rate of 196,000 kg/hr. Vacuum in condenser is 702 mmHg. Sea water for cooling enters at 29.5 deg C and leaves at 37.5 deg C. For steam turbine condenser, manufacturers consider 950 Btu/lb of steam turbine condensed as heat given up to cooling water. Calculate the logarithmic mean temperature difference.The air-handling unit of an air conditioning plant a total of 300 m3/min of dry air which comprises by volume 20% fresh air at DBT=40'C, WBT= 29°C and 80% return air at DBT-25 C, RH-50%. The air conditioned space has a sensible and latent heat load of 58 kW and 14.5 kW respectively. Calculate: a) Air supply temperature (Ts). b) Apparatus dew point temperature (ADP). c) BPF. d) The cooling coil load in TR. e) Plot the processes psychometrically.
- 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.1. 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.Consider the heating of water in a pan on a top of a range. If 24 kJ of heat is transferred to the water from heating element and 6 kJ of it is lost from the water to the surrounding air. Determine;(a) the net heat transfer to the water,(b) the efficiency for boiling water.