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 air = 0.0175 kg water vapor / kg dry air
Latent heat of evaporation of water = 589 kcal/kg
Specific heat of air = 0.245 kcal/kgoC
Specific heat of water vapor = 0.45 kcal/kgoC
Homework Answers
Add Answer to:
The following data were obtained during a test run of a packed
cooling tower of 0.4...
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
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...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure it? Is the wet-bulb temperature greater than dry-bulb temperature? Why? [10 p] 2. A cooling tower is to be designed to cool 8 kg/s of water from 37°C to 29 °C. Entering air is 25 °C and at 30 % relative humidity. Leaving air is 22 °C and at 90% relative humidity. a) Calculate the air flow rate, G. b) Determine the possible lowest...
2. (25 pts) Nuclear power plants have large amounts of heated water to cool, which may be done in a cooling tower. A sample tower reduces the temperature of warm water from 130 F to 90'F (see fig...
2. (25 pts) Nuclear power plants have large amounts of heated water to cool, which may be done in a cooling tower. A sample tower reduces the temperature of warm water from 130 F to 90'F (see figure at right). Air without water vapor flows into the tower at Wet air 156,900 b/hr 151,000 lb/hr Given that the air removing heat along with some water flows at 156,900 lb/hr, what is the flowrate of the cooled warm water 250,000 lb/hr...
A building is designed for the following cooling loads. Room specific heat gain and latent heat g...
A building is designed for the following cooling loads. Room specific heat gain and latent heat gains are 310 kW and 100 kW respectively. The room is maintained at a dry bulb temperature of 25°C and relative humidity of 50%. The outdoor air is at 28°C with 50% relative humidity, 10% by mass of outdoor air is supplied to the building. If the air supplied to the room should be at a temperature lower than 18°C, detemine the following. (a)...
The oceans cover 3.61×1014 m2 of the surface of the Earth. If we take the global...
The oceans cover 3.61×1014 m2 of the surface of the Earth. If we take the global averages for oceanic regions as: Surface temperature = 12°C Specific humidity at water surface = 0.018 Average atmospheric temperature at 10 m above the water surface = 15°C Specific humidity at 10m = 0.010 Latent heat fluxes are estimated to be 80 Wm-2 Shortwave solar radiation incident on the ocean = 170 Wm-2 Cloudiness, C = 2.56 Oktas a) Is the global ocean heating...
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperat...
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperature of 20 °C. (a) How much collector surface area does it need for an all-solar thermal heating system that has an absorptivity of 0.2? The average solar radiation in winter is about 6.5 kWh/m2/day. [35 points] a) What is the mass of water required if this energy is stored as sensible heat energy storage system? Where the water operates between 20...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by injecting liquid water into the air leaving the low pressure compressor. The intercooler in the sketch provides cooling partly by cold water injection and partly by heat transfer to the surroundings. A steady flow of air enters 1 mw the compressor at T = 20°C, P = 100 kPa and a relative humidity compressor intercooler of o. = 50% at a flow rate of...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes in moist air at 28°C, 1 atm and 70% relative humidity. The moist air first passes over a cooling coil in the dehumidifier unit and some water vapor is condensed. The rate of heat transfer between the moist air and the cooling coil is 38.69 kW. Both saturated moist air and condensate streams exit the dehumidifier unit at the same temperature. The moist air...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
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...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure it? Is the wet-bulb temperature greater than dry-bulb temperature? Why? [10 p] 2. A cooling tower is to be designed to cool 8 kg/s of water from 37°C to 29 °C. Entering air is 25 °C and at 30 % relative humidity. Leaving air is 22 °C and at 90% relative humidity. a) Calculate the air flow rate, G. b) Determine the possible lowest...
2. (25 pts) Nuclear power plants have large amounts of heated water to cool, which may be done in a cooling tower. A sample tower reduces the temperature of warm water from 130 F to 90'F (see figure at right). Air without water vapor flows into the tower at Wet air 156,900 b/hr 151,000 lb/hr Given that the air removing heat along with some water flows at 156,900 lb/hr, what is the flowrate of the cooled warm water 250,000 lb/hr...
A building is designed for the following cooling loads. Room specific heat gain and latent heat gains are 310 kW and 100 kW respectively. The room is maintained at a dry bulb temperature of 25°C and relative humidity of 50%. The outdoor air is at 28°C with 50% relative humidity, 10% by mass of outdoor air is supplied to the building. If the air supplied to the room should be at a temperature lower than 18°C, detemine the following. (a)...
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperature of 20 °C. (a) How much collector surface area does it need for an all-solar thermal heating system that has an absorptivity of 0.2? The average solar radiation in winter is about 6.5 kWh/m2/day. [35 points] a) What is the mass of water required if this energy is stored as sensible heat energy storage system? Where the water operates between 20...
2. (12 marks total) A number of gas turbine engines today have compressor intercooling provided by injecting liquid water into the air leaving the low pressure compressor. The intercooler in the sketch provides cooling partly by cold water injection and partly by heat transfer to the surroundings. A steady flow of air enters 1 mw the compressor at T = 20°C, P = 100 kPa and a relative humidity compressor intercooler of o. = 50% at a flow rate of...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes in moist air at 28°C, 1 atm and 70% relative humidity. The moist air first passes over a cooling coil in the dehumidifier unit and some water vapor is condensed. The rate of heat transfer between the moist air and the cooling coil is 38.69 kW. Both saturated moist air and condensate streams exit the dehumidifier unit at the same temperature. The moist air...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
Most questions answered within 3 hours.
-
Sleep: Assume the general population gets an
average of 7 hours of sleep per night. You...
asked 8 minutes ago -
Florence, who weighs 540 N, stands on a bathroom scale in an
elevator. What will she...
asked 1 second from now -
Estimate the amount of Canadians who are vegans accurate to
within 2% with a 91% confidence...
asked 5 minutes ago -
A local greenhouse sells coffee-tree saplings. They price their
saplings based on the height of the...
asked 5 minutes ago -
As two cars move toward each other, the speedometer of one car
reads 57.9 km/h while...
asked 6 minutes ago -
A factory worker pushes a 30.0 kg crate a distance of 5.7 m
along a level...
asked 10 minutes ago -
In one statistics class, students were given one homework
assignment. The professor asked students to find...
asked 30 minutes ago -
(a) Calculate the force needed to bring a 1050 kg car to rest
from a speed...
asked 29 minutes ago -
A box contains 14 large marbles and 19 small marbles. Each
marble is either green or...
asked 45 minutes ago -
The results of a one-sample t test were t (18) = 2.11,
p < 0.05. In...
asked 55 minutes ago -
What kind of share-based compensation does the company have for
Verizon? What was compensation expense for...
asked 1 hour ago -
Place each of the following transactions in one of the four
components of expenditure: (remember it...
asked 1 hour ago