Answer / zaipracas

cooling towers works on evaporation of water, but heat exchanger works on the conduction and convection both.

Answer / abul hasan

In Heat Exchenger only heat trnsfer take place,where in
cooling tower both heat transfer as well as mass transfre
take place

Answer / rosh

THERE IS DIRECT CONTACT BETWEEN TWO FLUIDS IN COOLING TOWERS, BUT IN HEAT EXCHANGERS IT IS NOT NEEDED.

Answer / kirankumarrds

1.In cooling towers there is a direct contact b/w the fluids
is there,where as in HE it is not
2.In cooling towers both ht and mt takes place,ht is taking
place from upcoming vapors to falling fluid,mt is takes
place from falling fluid to vapor.In HE only ht is takes place

Answer / chetan gice

In colling tower both mt&ht takes place but in heat exchanger only ht takes place why because there is indirect contact between both where as cooling tower both are in direct contact

Answer / ss

both r wrking on the same principle only a bit differn is
cooling water tower evoporate the water up to th ewet bulb
temprtuer of atm air,i.e its depend on the atm air
condition,but in case of typical heat exchnger the heat
transfer is not depend on atm air wbt they only depen on the
two fluids amngs the heat transfer tkes place

Answer / diipk

basi difference of latent heat CT water gives latent heat to air but in HE latent heat taken from external source ie hot water/brine etc

Answer / govind murali

Cooling Tower is a kind of heat exchanger. The difference lies in the method of energy transfer. Cooling tower may also be considered as a Mass Transfer device because the cooling of water takes place because due to the evaporation of water caused by air. In a normal heat exchanger, only energy transfer takes place, but in a cooling tower both energy and mass transfer takes place.

Answer / kumar phanishwar

there are two types of heat exchangers based on the type of
interaction between fluid:
1. Direct Contact
2. Indirect Contact

Shell & Tube as well as plate type heat exchangers are
indirect contact heat exchangers as heat transfer is through
the surface separating two fluids.

Cooling tower in a direct contact heat exchanger.
In this type of heat exchanger fluids mix with each other
and transfer heat as well as mass.

Answer / shahbaz

In heat exchanger there is heat transfer from hot fluid to cold fluid and make steam and in colig tower heat is removed by faling hot water frm hight and it gets cold .

What are the assumptions made for kynch theory?

0 Answers  

What is pneumatic conveying?

0 Answers  

hi can u send me all d technical qus pepar of DRDO?my email id is palmzk@gmail.com

0 Answers  

What are the frequently asked technical questions in chemical engineering during PI?

0 Answers  

Question 81 - (a) In natural gas pipe sizing, the length of the pipe from the gas source metre to the farthest appliances is 60 feet. The maximum capacities for typical metallic pipes of 60 feet in length are : 66 cubic feet per hour for pipe size of 0.5 inches; 138 cubic feet per hour for pipe size of 0.75 inches; 260 cubic feet per hour for pipe size of 1 inch. By using the longest run method : (i) Find the best pipe size needed for the capacity of 75 cubic feet per hour. (ii) Estimate the suitable range of capacities for the pipe size of 1 inch. (b) The maximum capacities for typical metallic pipes of 50 feet in length are : 73 cubic feet per hour for pipe size of 0.5 inches; 151 cubic feet per hour for pipe size of 0.75 inches; 285 cubic feet per hour for pipe size of 1 inch. By using the branch method find the best pipe size needed for the capacity of 75 cubic feet per hour when the length of the pipe from the gas source metre to the appliance is 52 feet.

1 Answers  

CHEMICAL ENERGY BALANCE - EXAMPLE 11.2 : Calculate the cooling duty, H required to condense and cool acetone from 100 degree Celsius to 25 degree Celsius at atmospheric pressure. The heat of vaporization for acetone at its normal boiling point is 30.2 kJ / mol. The boiling point of acetone at atmospheric pressure is 56 degree Celsius. The flowrate of acetone through the condenser is 100 mol / s = N. Value of sensible heat needed to increase the temperature of acetone in liquid form from 25 to 56 degree Celsius is 4.06 kJ / mol. Value of sensible heat needed to increase the temperature of acetone in vapor form from 56 to 100 degree Celsius is 3.82 kJ / mol. Unit of H is kJ / s.

1 Answers  

Is it advisable to cool a fin fan by spraying demineralized water on it?

0 Answers  

Explain what are the problems that are associated with the expansion joints?

0 Answers  

Explain what types of valves are recommended for slurry services?

0 Answers  

Hi this is aparna.............can any one send drdo question papers on my email id-aparna_patna08@yahoo.com Thanks in advance

2 Answers   DRDO,

respected sir,i have been selected in the written examination(CHEMICAL) of IOCL Panipat held on 30 m1rch, So please tell me which type of questions asked in this interview frequently.Can u mail me some questions?

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pls send me model paper of NPCIL for executive trainee. and syllabus of executive trainee 2015.

0 Answers