It is required to maintain an air-conditioned room at 28°C DBT and 20°C WBT, the room has a sensible heat load of 45 kW and a latent heat load of 16 kW. The air supplied from the outside atmosphere at 40°C DBT and 28°C WBT is 22 m³/min, directly into the room through ventilation and infiltration. Outside air to be 6 conditioned is passed through the cooling coil whose apparatus dew point is 9°C. 60% of the recirculated air from the room is mixed with the conditioned air after the cooling coil. Sketch the processes on a psychrometric chart and determine: (i) Air conditioning after the coil and before the recirculated air mixes with it. (ii) Condition of air entering the room i.e., after mixing with recirculated air. (iii) Mass of fresh air entering the cooler. (iv) By-pass factor of the cooling coil. (v) Capacity of the cooling coil

It is required to maintain an air-conditioned room at 28°C DBT and 20°C WBT, the room has a sensible heat load of 45 kW and a latent heat load of 16 kW. The air supplied from the outside atmosphere at 40°C DBT and 28°C WBT is 22 m³/min, directly into the room through ventilation and infiltration. Outside air to be 6 conditioned is passed through the cooling coil whose apparatus dew point is 9°C. 60% of the recirculated air from the room is mixed with the conditioned air after the cooling coil. Sketch the processes on a psychrometric chart and determine: (i) Air conditioning after the coil and before the recirculated air mixes with it. (ii) Condition of air entering the room i.e., after mixing with recirculated air. (iii) Mass of fresh air entering the cooler. (iv) By-pass factor of the cooling coil. (v) Capacity of the cooling coil

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

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Similar questions

The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40F
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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).
An auditorium is to be maintained at a temperature of 26℃ DB and 50% RH. Air is to be supplied at a temperature not lower than 15℃ DB. The sensible heat gain is 110 kW 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℃ DB and 60% RH. Determine the refrigerating load in Tons of Refrigeration (TR).
A space to be air-conditioned has a sensible heat load of 34.9 hp and a latent heat load of 6.97 hp. The space is to maintained at 24°C DB and 17°C WB. Outside air is at 32°C DB and 24°C WB temperatures. With a re-heater to satisfy the space conditions, the conditioned air will enter the space at 18°C. If 40% of the supply air, is fresh air and the rest is re-circulated, find the specific humidity of outside air in kgv/kgda. The mass flow rate of supply air, ms is 312 kg/min. Take the mass flow rate of supply air, (ms = the sum of air mass flow rate to dissipate the sensible heat, msh, and the air mass flow rate to dissipate the latent heat, mlh). Take cp of dry air = unity. A) 0.0155 B) 0.0070 C) 0.0130 D) 0.0092
A space to be air-conditioned has a sensible heat load of 34.9 hp and a latent heat load of 6.97 hp. The space is to maintained at 24°C DB and 17°C WB. Outside air is at 32°C DB and 24°C WB temperatures. With a re-heater to satisfy the space conditions, the conditioned air will enter the space at 18°C. If 40% of the supply air, is fresh air and the rest is re-circulated, find the volume flow rate of outside air in m3/min. The mass flow rate of supply air, ms is 312 kg/min. Take the mass flow rate of supply air, (ms = the sum of air mass flow rate to dissipate the sensible heat, msh, and the air mass flow rate to dissipate the latent heat, mlh). Take cp of dry air = unity. (A) 121.2 B) 109.8 (C) 91.2 D) 115.8
I need the answer as soon as possible
moist air supplied to an air conditioned room is 600 m3 /min. The External conditions are 34.4°C DBT and 60% RH. The required conditions are 21°C DBT and 70% RH. find out 1- sensible heat and latent heat removed from the air per minute. 2- sensible heat factor for the system.
The large insulated flash chamber of a vacuum refrigeration plant is kept at low temperatureby a steam jet which pumps vapor to a condenser . The condensate pump removes thecondensate formed and an air ejector discharges air from the condenser to an air vent .Warm water returns enters the flash chamber at 13 deg C ; chilled water leaves the flashchamber at 4 deg C . The vapor leaving the flash chamber has a dryness factor of 97% andthe condenser inside temperature is 32 deg C . For 100 tons of refrigeration , determine thequantity in cubic meter per minute of chilled water at 4 deg C that the system can provide .A) 0.45 B) 0.56 C) 9.33 D) 0.75
Only answer G and H, the important info you need should already be worked out above.
A refrigerator is used to keep the cold space at 5 °C by rejecting 8 kJ/s of heat by the condenser tothe outdoor air at 25 °C. If the compressor consumes 3 kJ/s of power, determinei. the rate of heat removed from the cold space (kJ/s),ii. the COP of the refrigeratoriii. the minimum power input to the compressor for the same rate of heat removed (kJ/s), andiv. draw the schematic of the refrigerator as a reversed heat engine.
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