What factors should be compared when evaluating cooling tower bids?

What factors should be compared when evaluating cooling tower bids?
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1 Answer

Answer :

Examining the following factors should allow for a reasonable evaluation of cooling towers:
1) Purchased cost
2) Installed cost
3) Fan energy consumption
4) Pump energy consumption
5) Water use
6) Water treatment costs
7) Expected maintenance costs
8) Worker safety requirements
9) Environmental safety
10) Expected service life
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Related questions

A packed tower compared to a plate tower for a particular mass transfer operation (A) Incurs smaller pressure drop (B) Allows installation of cooling coils (C) Is less costly when built in large sizes/diameters (D) Is more suitable, if suspended solids are present in fluid stream

Description : A packed tower compared to a plate tower for a particular mass transfer operation (A) Incurs smaller pressure drop (B) Allows installation of cooling coils (C) Is less costly when built in large sizes/diameters (D) Is more suitable, if suspended solids are present in fluid stream

Last Answer : (A) Incurs smaller pressure drop

Factors affecting cooling of water in a cooling tower are: a. Temperature of air b. Humidity of air c. Temperature of hot air d. All of the above

Description : Factors affecting cooling of water in a cooling tower are: a. Temperature of air b. Humidity of air c. Temperature of hot air d. All of the above

Last Answer : Ans:- d. All of the above

State two factors on which efficiency of cooling tower depends.

Description : State two factors on which efficiency of cooling tower depends.

Last Answer : Efficiency of cooling tower depends on 1.Losses in duct, piping and joints, pipes should be free from scale/rust 2.Efficient heat transfer, maintenance of piping , Ensure fill is clean and free of debris. 3.Sufficient airflow and correct fan speed. 

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is (A) Natural draft cooling tower (B) Induced draft cooling tower (C) Spray chamber (D) None of these

Description : The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is (A) Natural draft cooling tower (B) Induced draft cooling tower (C) Spray chamber (D) None of these

Last Answer : (C) Spray chamber

When the temperature and humidity of air is low, we usually use __________ draft cooling tower. (A) Natural (B) Forced (C) Induced (D) None of these

Description : When the temperature and humidity of air is low, we usually use __________ draft cooling tower. (A) Natural (B) Forced (C) Induced (D) None of these

Last Answer : (A) Natural

Make up water is supplied during cooling tower operation to compensate for water losses due to (A) Evaporation(B) Blowdown(C) Entrainment(D) All (A), (B) & (C)

Description : Make up water is supplied during cooling tower operation to compensate for water losses due to (A) Evaporation (B) Blowdown (C) Entrainment (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Heat load in a cooling tower (A) Means the amount of heat thrown away (KCal/hr.) by the cooling tower (B) Is equal to the number of kg, of water circulated times the cooling range (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Heat load in a cooling tower (A) Means the amount of heat thrown away (KCal/hr.) by the cooling tower (B) Is equal to the number of kg, of water circulated times the cooling range (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

The term "cooling range" in a cooling tower refers to the difference in the temperature of (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air(B) Hot water entering the tower and the wet bulb temperature of thesurrounding air(C) Hot water entering the tower and the cooled water leaving the tower(D) None of these

Description : The term "cooling range" in a cooling tower refers to the difference in the temperature of (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air (B) Hot water entering the ... air (C) Hot water entering the tower and the cooled water leaving the tower (D) None of these

Last Answer : (C) Hot water entering the tower and the cooled water leaving the tower

Make up water is required in a cooling tower to replace the water lost by (A) Evaporation (B) Drift (C) Blowdown and leakage (D) All (A), (B) and (C)

Description : Make up water is required in a cooling tower to replace the water lost by (A) Evaporation (B) Drift (C) Blowdown and leakage (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Can a cooling tower cool water below the wet bulb temperature of inlet air? (A) Yes (B) No (C) Yes; but height of cooling tower will be prohibitively high (D) Yes; but the air flow rate should be excessively high

Description : Can a cooling tower cool water below the wet bulb temperature of inlet air? (A) Yes (B) No (C) Yes; but height of cooling tower will be prohibitively high (D) Yes; but the air flow rate should be excessively high

Last Answer : (B) No

Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Description : Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of ... (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Last Answer : (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column

Drift in a cooling tower is (A) The water entrained by the circulating air (B) Dependent on the water lost by evaporation (C) Desirable (D) All (A), (B) & (C)

Description : Drift in a cooling tower is (A) The water entrained by the circulating air (B) Dependent on the water lost by evaporation (C) Desirable (D) All (A), (B) & (C)

Last Answer : (A) The water entrained by the circulating air

__________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower. (A) Sherwood (B) Stanton (C) Lewis (D) Peclet

Description : __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower. (A) Sherwood (B) Stanton (C) Lewis (D) Peclet

Last Answer : (C) Lewis

The term "approach" in a cooling tower refers to the difference in the temperature of the (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air (B) Hot water entering the tower and the wet bulb temperature of the surrounding air (C) Hot water entering and the cooled water leaving the cooling tower (D) None of these

Description : The term "approach" in a cooling tower refers to the difference in the temperature of the (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air (B ... (C) Hot water entering and the cooled water leaving the cooling tower (D) None of these

Last Answer : (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air

Which of the following employs an accessory known as 'drift eliminator'? (A) Multiple effect evaporator (B) Mechanical draft cooling tower (C) Rotary dryer (D) Rotating disc contacto

Description : Which of the following employs an accessory known as 'drift eliminator'? (A) Multiple effect evaporator (B) Mechanical draft cooling tower (C) Rotary dryer (D) Rotating disc contacto

Last Answer : (B) Mechanical draft cooling tower

Use of natural draft cooling tower is practised, when the air has low (A) Humidity (B) Temperature (C) Both 'a' & 'b' (D) Neither 'a' nor 'b'

Description : Use of natural draft cooling tower is practised, when the air has low (A) Humidity (B) Temperature (C) Both 'a' & 'b' (D) Neither 'a' nor 'b'

Last Answer : (C) Both 'a' & 'b

The most efficient cooling tower out of the following is (A) Induced draft (B) Forced draft (C) Natural draft (D) Atmospheric

Description : The most efficient cooling tower out of the following is (A) Induced draft (B) Forced draft (C) Natural draft (D) Atmospheric

Last Answer : (A) Induced draft

The cooling effect in a cooling tower cannot be increased by (A) Increasing the air velocity over the wet surfaces (B) Reducing the humidity of entering air (C) Lowering the barometric pressure (D) None of these

Description : The cooling effect in a cooling tower cannot be increased by (A) Increasing the air velocity over the wet surfaces (B) Reducing the humidity of entering air (C) Lowering the barometric pressure (D) None of these

Last Answer : (D) None of these

The temperature of water cooled in cooling tower is always __________ temperature of entering air. (A) More than the wet bulb (B) Less than the wet bulb (C) Equal to the wet bulb (D) Equal to the dry bulb

Description : The temperature of water cooled in cooling tower is always __________ temperature of entering air. (A) More than the wet bulb (B) Less than the wet bulb (C) Equal to the wet bulb (D) Equal to the dry bulb

Last Answer : (A) More than the wet bulb

Pick out the wrong statement pertaining to the cooling towers. (A) In case of induced draft cooling tower, the fan is placed at the top of the tower (B) Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air (C) A natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low (D) Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Description : Pick out the wrong statement pertaining to the cooling towers. (A) In case of induced draft cooling tower, the fan is placed at the top of the tower (B) Effectiveness of ... Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Last Answer : (D) Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)

Description : Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)

Last Answer : (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height. (A) 10-15 (B) 30-40 (C) 70-80 (D) 90-100

Description : A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height. (A) 10-15 (B) 30-40 (C) 70-80 (D) 90-100

Last Answer : (A) 10-15

The cooling effect in a cooling tower can be speeded up by (A) Increasing the air velocity and area of exposed wet surface (B) Reducing the barometric pressure (C) Reducing the humidity of the air (D) All (A), (B) and (C)

Description : The cooling effect in a cooling tower can be speeded up by (A) Increasing the air velocity and area of exposed wet surface (B) Reducing the barometric pressure (C) Reducing the humidity of the air (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

In a cooling tower, water becomes cool by (A) Loosing sensible heat (B) Heat transfer to surroundings (C) Vaporisation due to heat loss to air (D) Loosing latent heat

Description : In a cooling tower, water becomes cool by (A) Loosing sensible heat (B) Heat transfer to surroundings (C) Vaporisation due to heat loss to air (D) Loosing latent heat

Last Answer : (A) Loosing sensible heat

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan (A) With greater number of blades (B) Of increased diameter (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan (A) With greater ... (B) Of increased diameter (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

'Flare tower' used in industry is meant for (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure (B) Absorbing the pollutant gases from the furnace exhaust (C) Cooling of furnace exhaust gases (D) None of these

Description : 'Flare tower' used in industry is meant for (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure (B) Absorbing the pollutant gases from the furnace exhaust (C) Cooling of furnace exhaust gases (D) None of these

Last Answer : (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure

The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air. (A) Ambient (B) Dry bulb (C) Dew point (D) Wet bulb

Description : The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air. (A) Ambient (B) Dry bulb (C) Dew point (D) Wet bulb

Last Answer : C) Dew point

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air. (A) Wet bulb (B) Dry bulb (C) Saturation (D) Dew point

Description : Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air. (A) Wet bulb (B) Dry bulb (C) Saturation (D) Dew point

Last Answer : Option A

What could be a possible cause for sudden foaming in a cooling tower?

Description : What could be a possible cause for sudden foaming in a cooling tower?

Last Answer : Assuming that no other changes have been made, especially to the water treatment chemicals, the most common outcome to this mystery is a leaking heat exchanger. Begin a systematic check of all of ... in the tower. In addition, not all of these components will set off a conductivity alarm

IS there a rule of thumb to estimate the footprint of a cooling tower during design phase?

Description : IS there a rule of thumb to estimate the footprint of a cooling tower during design phase?

Last Answer : Over the years, this one has seemed to stand the test of time: Every million Btu/h of tower capacity will require approximately 1000 ft2 of cooling tower basin area.

When specifying a cooling tower, should I look up historic wet bulb temperatures for my area or should I take measurements?

Description : When specifying a cooling tower, should I look up historic wet bulb temperatures for my area or should I take measurements?

Last Answer : If this is a new installation, look up historical wet bulb temperatures for area and be sure to report them to the cooling tower manufacturer as ambient wet bulb temperatures . The ... the tower entrance. The entering wet bulb temperature always higher than the ambient wet bulb temperature.

What is the definition of “good” cooling tower water?

Description : What is the definition of “good” cooling tower water?

Last Answer : Generally speaking, cooling tower water should have a pH between 6 and 8, a chloride content no more than 750 ppm, a sulfate content (SO4) below 1200 ppm, and a sodium bicarbonate (NaHCO3) ... intermittently with a free residual not to exceed 1 ppm and this should be maintained for short periods.

How much water is lost through a commercial cooling tower system with a throughput of about 600 GPM?

Description : How much water is lost through a commercial cooling tower system with a throughput of about 600 GPM?

Last Answer : This question depends on many factors. It sounds like the tower is small. A rule of thumb suggests that the tower will see an evaporation loss of about 0.1% of the circulation flowrate for each ... and blow down. Blow down is simply a purge of tower water to prohibit the buildup of solids.

What factors should I take into consideration when evaluating and purchasing power generators for home use?

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What are some factors that I should take into consideration when evaluating and purchasing term assurance policies?

Description : What are some factors that I should take into consideration when evaluating and purchasing term assurance policies?

Last Answer : There are several factors you should take into account before purchasing term assurance policies. These include: comparing rates, reading the fine print and assessing the customer service of the provider.

Reducing assurance engagement risk to zero is very rarely attainable or cost beneficial as a result of the following factors, except a. The use of selective testing. b. The fact that much of the evidence available to the practitioner is persuasive rather than conclusive. c. The practitioner may not have the required assurance knowledge and skills to gather and evaluate evidence. d. The use of judgment in gathering and evaluating evidence and forming conclusions based on that evidence

Description : Reducing assurance engagement risk to zero is very rarely attainable or cost beneficial as a result of the following factors, except a. The use of selective testing. b. The fact that much ... d. The use of judgment in gathering and evaluating evidence and forming conclusions based on that evidence

Last Answer : The practitioner may not have the required assurance knowledge and skills to gather and evaluate evidence.

Pressure drop through plate tower as compared to that through packed tower, for the same duty will be (A) Less (B) More (C) Equal (D) Either (A) or (B); depends on the packing height

Description : Pressure drop through plate tower as compared to that through packed tower, for the same duty will be (A) Less (B) More (C) Equal (D) Either (A) or (B); depends on the packing height

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Has anyone out there bought a new car by first going to local dealers to determine eactly what you want then putting specs online and getting bids from local dealers?

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Last Answer : answer:We usually go online first, and find all the comparable cars. We then go to a dealer, and if he tries to sell us something we don't want, we just leave. With the past two new cars we bought ... the best deal possible - from a dealer 75 miles away. I would have never driven that far for a car.

Can I trust eBay bids?

Description : Can I trust eBay bids?

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Description : Whoever, being a public servant, and being legally bound as such public servant,  not to purchase or bid for certain property, purchases or bids for that property, either in  his own name or in the name ... imprisonment for a term which may be extend 3 year or with fine or both  d) None of these

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