In a cooling tower, air at 20°C and 50% RH enters the tower at a rate...
In a cooling tower, air at 20°C and 50% RH enters the tower at a rate of 20 m3 /s and leaves at 28°C and 85% RH. The water leaving the tower is 10°C cooler than the water entering the tower. Assume specific heat of water is 4.19 kJ/kg K. Determine
i. The mass flow rate of water in kg/s
ii. Mass flow rate of make-up water in kg/s
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In a cooling tower, air at 20°C and 50% RH enters the tower at a
rate...
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s is cooled to 22°C in the cooling tower by air that enters the tower at 1 atm, 20°C, and 60% relative humidity and leaves saturated at 3...
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s
is cooled to 22°C in the cooling tower by air that enters the tower
at 1 atm, 20°C, and 60% relative humidity and leaves saturated at
30°C. The makeup water of 22°C is supplied to the outlet to make
the mass flow rate of the cool water the same as that at the inlet,
see Figure Q5.
Q.5Water entering a wet cooling tower at 35°C at...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temper...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temper...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...
4) 15% Air psychometric chart). enters and exits an air conditioner with the properties shown below...
4) 15% Air psychometric chart). enters and exits an air conditioner with the properties shown below (as determined from the Cooling cols Air Condensate Property Estering Exiting | 2S Dry bulb temperature CC)-35 ℃ Wet bulb temperature ("C1-20℃ Eethalpy (h, kJ/kg dry air)$7.5 40.9 Absolute humidity (o, kg H-O/kg dry air) 0.0085 0 0062 0.882 Specific volume (m/kg)1 0.8850 The condensate leaves volume flow rate of the air returned to the workspace is 800 m3/min. Atmospheric pressure is 9 the...
Example 5: Ambient air at 38°C db-temperature and 20°C wb- temperature enters an evaporative cooler with...
Example 5: Ambient air at 38°C db-temperature and 20°C wb- temperature enters an evaporative cooler with a dry air mass flow rate of 0.75 kg/s. The pressure is constant at 95 kPa. The air leaves at a db-temperature of 25°C. Calculate (i) the relative humidity of the air at inlet, (ii) the relative humidity of the air at exit, (iii) the rate of flow of water to the cooler, and (iv) the saturation effectiveness of the cooler.
The following data were obtained during a test run of a packed cooling tower of 0.4...
The following data were obtained during a test run of a packed cooling tower of 0.4 m dia and 1 m packed height, operating at atmospheric pressure. Calculate the humidity of the exit air by means of an enthalpy balance. Average temperature of entering and leaving air is 38oC and 39oC respectively. Average temperature of water entering and leaving is 46oC and 35oC respectively.Rate of entering air = 13.6 m3/min Rate of entering water = 1000 kg/hr Humidity of entering...
Subject Refrigeration and Air Conditioning. Please answer in detail. QUESTION 15-COOLING TOWERS AND EVAPORATIVE CONDENSERS A...
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 15-COOLING TOWERS AND EVAPORATIVE CONDENSERS A cooling tower is a device that cools a spray of water by passing it through a stream of air. If 15 m3/s of air is at 35 °C dry-bulb and 24 °C wet-bulb temperature and an atmospheric pressure of 101 kPa enters the tower and the air leaves saturated at 31 °C, (a) to what temperature can this airstream cool a spray of water...
Moist air at 300C and 50% RH enters a dehumidifier operating at steady state with a...
Moist air at 300C and 50% RH enters a dehumidifier operating at steady state with a volumetric flowrate of 280 m3/min. the moist air passes over the refrigerating coil and water condenses. The condensate leaves at 100C. Saturated moist air leaves in a separate stream at the same temperature. There is no significant loss of energy by heat transfer to the surroundings and the pressure remains constant at 1.013 bar. What is the rate of condensation of water in kg/min?...
An air-water vapor mixture enters a heater-humidifier unit at 5°C, 100 kPa, 50% rh. The flow rate of dry air is 0.1 kg/s. Liquid water at 10°C is sprayed into the mixture al the rate of 0.0022 kg/s. The mixture leaves the unit at 30°C, 100 kPa. Calculate
An air-water vapor mixture enters a heater-humidifier unit at 5°C, 100 kPa, 50% rh. The flow rate of dry air is 0.1 kg/s. Liquid water at 10°C is sprayed into the mixture al the rate of 0.0022 kg/s. The mixture leaves the unit at 30°C, 100 kPa. Calculate (a) the relative humidity at the outlet (b) the rate of heat transfer to the unit
(3) Calculate the amount of water added per hour by an evaporative cooling system installed on...
(3) Calculate the amount of water added per hour by an evaporative cooling system installed on a dairy barn when 20 cubic meters of air at 30°C dry-bulb temperature and 40% RH enters the cooling unit per second and leaves at 80% RH. What are the dry-bulb and wet-bulb temperatures of the air leaving the evaporative cooler?
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s
is cooled to 22°C in the cooling tower by air that enters the tower
at 1 atm, 20°C, and 60% relative humidity and leaves saturated at
30°C. The makeup water of 22°C is supplied to the outlet to make
the mass flow rate of the cool water the same as that at the inlet,
see Figure Q5.
Q.5Water entering a wet cooling tower at 35°C at...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...
4) 15% Air psychometric chart). enters and exits an air conditioner with the properties shown below (as determined from the Cooling cols Air Condensate Property Estering Exiting | 2S Dry bulb temperature CC)-35 ℃ Wet bulb temperature ("C1-20℃ Eethalpy (h, kJ/kg dry air)$7.5 40.9 Absolute humidity (o, kg H-O/kg dry air) 0.0085 0 0062 0.882 Specific volume (m/kg)1 0.8850 The condensate leaves volume flow rate of the air returned to the workspace is 800 m3/min. Atmospheric pressure is 9 the...
Example 5: Ambient air at 38°C db-temperature and 20°C wb- temperature enters an evaporative cooler with a dry air mass flow rate of 0.75 kg/s. The pressure is constant at 95 kPa. The air leaves at a db-temperature of 25°C. Calculate (i) the relative humidity of the air at inlet, (ii) the relative humidity of the air at exit, (iii) the rate of flow of water to the cooler, and (iv) the saturation effectiveness of the cooler.
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 15-COOLING TOWERS AND EVAPORATIVE CONDENSERS A cooling tower is a device that cools a spray of water by passing it through a stream of air. If 15 m3/s of air is at 35 °C dry-bulb and 24 °C wet-bulb temperature and an atmospheric pressure of 101 kPa enters the tower and the air leaves saturated at 31 °C, (a) to what temperature can this airstream cool a spray of water...
(3) Calculate the amount of water added per hour by an evaporative cooling system installed on a dairy barn when 20 cubic meters of air at 30°C dry-bulb temperature and 40% RH enters the cooling unit per second and leaves at 80% RH. What are the dry-bulb and wet-bulb temperatures of the air leaving the evaporative cooler?
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