Check out 10:18 Actually all molecules are in random motion with different velocities. Some are moving slower and some are moving faster. The average kinetic energy of all the molecules is called sensible heat and it is proportional to temperature. Only those molecules which is having very high kinetic energy will be able to break the intermolecular forces and will go into vapor phase. So the average kinetic energy of remaining molecules will go down and hence sensible heat and temperature of remaining molecules will drop. As temperature of water drop decreases with time, vapor pressure decreases causing a reduction in partial pressure driving force. Temperature driving force for heat transfer from ambient air to water increases.
I had to go through this video more than once to get all the concepts clear and when I got my points clear, bht jyada maja aaya samajh ke.. Thank you! :)
U are the best teacher sir not only on knowledge basis but U help me and i am a student of small town and i am helped by u. Sir plz add more video lect i am requesting u sir i am not financially sound that much . Namste sir
This video contains some theoretical concepts which is very difficult to find anywhere. This concept help me with all the doubts of Cooling tower and humidification. Thank you sir.
What an extraordinary explanation..! U know, I am an Industrial Hygienist by profession. With the use of this concept, I have successfully correlated the concept of Body heat removal by our body & why & how it's affected in a highly humid atmosphere. Now I can utilize this knowledge to meaningfully educate the workers/employees throughout my professional life....! How many will be affected by this knowledge (in a positive manner, of course)..!! I appreciate the fever that u have done, rather you are still doing by this way...! Salute to the soul..!
Thank You very much for your kind words ! Please watch my recent videos on this topic: 1. Cooling Tower how it works | Cooling Tower Working Principle | Wet bulb temperature explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gmZMKwpuok0.html 2. How to read Psychometric Chart in Hindi | Decoding Unique Patterns of Psychometric Chart Lines ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-sCrmjYqbKjk.html
So sir we can also say that definition of wet bulb temperature is the temperature at which partial pressure of water in air equal to the vapour pressure of water that temperature is called wet bulb temperature.
@@SandeepAcademy9 interview ke main questions 1. Which type cooling tower better and why? 2. what is wet bulb temperatures & dry bulb temperatures why dry bulb temperature greater than wet bulb temp 3. How to cooling in cooing tower and cycle of concentration in cooling tower 4. Kya cooling tower outlet water temperature wet bulb temperatures se down le ja sakte hain nahi le sa sakte to kyon 5. Which process involve in dm plant during deminralising process 6. How to separation of nitrogen and oxygen from atm air and which processes involve in this plant 7. Purity of inert gas means nitrogen gas which use as a purge gas in plants 8. Type of heat exchangers and uses different types type exchangers and different places 9. What is the lmtd and how to calculate lmtd in heat exchangers Etc..
Hii Sandeep. Very informative video u have made. thanks for the same. Can you make video on Raoult's law, vapour pressure, partial pressure and total pressure and VLE determination in a chemical engineering point of view
SIR, THANKS A LOT NICE VIDEO SIR,IT IS HELPING ME A LOT THANKS FOR VIDEO I HAVE ONE PROBLEM THAT I HAVE SOME CONFUSION..PLEASE WILL YOU HELP ME TO SLOVE QUESTION-AIR SUPPLIED TO A DRYER HAS A DRY BULB TEMP OF 40 C AND WET BULB TEMP IS 35 C .IT IS HEATED TO 120 C BY COILS AND BLOWN INTO THE .THE DRIER COOLS ALONG THE ADIABATIC COOLING LINE AND LEAVES THE DRYER AT 90% SATURATION. CALCULATE-1)DEW POINT OF INITIAL AIR. 2)ABSOLUTE % HUMIDITY 3) HOW MUCH WATER WILL BE EVAPORATED PER 10M^3 OF ENTERING AIR 4)AT WHAT TEMP THE AIR LEAVES
As you explain on wet bulb temperature,I understand that wet bulb temperature should be lower achieved upto partial pressure of atmosphere air is equilibrium with vapour pressure of wet bulb water...that means wet bulb temperature is goes Lower and lower upto equilibrium is get with partial pressure of water in air to vapour pressure of water on wet bulb...so my understanding is correct or wrong?
Well explained sir,but when temp. of water is less than dew temp. Of air , their will also reach that steady state . and in starting u explained that valorization takes place , but there will be sensible heat transfer from water to air and water's vapour pressure goes down and during this there is mass transfer from water to air , ya there may be some vaporization if there is vapour available( due to temp. Drop of water) is less than that value we get from pressure gradient.
I was reading the concept of adiabatic saturation. In this concept, it is written, that "The thermodynamic wet bulb temperature will be less than the entering air dry bulb temperature but greater than the dew point temperature" However, later I found a True/False question in which it was stated that "Wet Bulb temperature is always lower than dry bulb temperature but Higher than dew point temperature" I thought the answer to be True but correct answer was False. Can you explain why?
I still have a doubt that ,,if the fluid (air) got saturated after the wbt is reached or not , or consider a example when the same air recirculate here the saturation is reached .but what about the case of fresh air?? Consider a example shown in CP arora book.
Very nice explanation sir Which book do you follow for air conditioning Please suggest some good book for air conditioning as well as heat n mass transfer
Then I shouldn't not suggest you books for GATE mechanical engineering. Please ask someone who has done great in GATE mechanical engineering. I will keep uploading videos which will be helpful to you. But as far as books is concerned I am not the right person.
Thanks. Is Cooling tower sized based on summer relative humidity or rainy season relative humidity.. Do we required to increase CT fans speed during rainy season?
Yeah, in rainy season, though latent heat i.e., evaporative heat transfer decreases or diminishes, but sensitive heat transfer increases greatly. Increasing fan speeds in CTs will help increase the turbulence and thus OHT.
The temperature of the interface and the wet bulb temperature are very close to each other. Yes or no? If yes, can we easily interchange Ti and Tw in the equation relating sensible and latent heat flows?
the molar flux equation mentioned in your slide has an (1-y)LMTD term in the denominator. I refer B K Dutta's book to study interface mass transfer but that term is not mentioned in the equations. Please explain that.
Sir reliance ka petrochemical & refinary ka interview he Mera 24 ko , kya padhu please suggest kijiye na , mechanical engineering se campus interview he
gen.lib.rus.ec/search.php?req=unit+operations+of+chemical+engineering&lg_topic=libgen&open=0&view=simple&res=25&phrase=0&column=def Or docs.google.com/file/d/0B6mmcxyrKnEhdEY0ZTMzeHNVSHM/edit
Basit Nevarekar .There are videos on RU-vid about how to read psychometric chart. Please check it out. After watching those videos if you still think I should make a video. Then I will make. I usually make videos for topics which have no video on RU-vid. I made for wet bulb temperature because I found all available video on RU-vid is actually clueless regarding wet bulb temperature. They just talk about wet bulb but do not know exactly about wet bulb temperature.
Indra Bhushan - Phase equilibrium & Chemical Equilibrium ye dono easy topics h....in topics pe bahut sare videos pahle se available h....aap check kar lijiye .
Mujhe abhi bahut sare topics pe video banane h...aur mujhe time bhi bahut kam milta h...isliye ye promise nahi kar sakta ki video bana hi dunga equilibrium pe agar time milega tab dekhenge.
naveen solanki, Bhai maine cooling tower operate nahi kiya h...isliye indepth knowledge nahi h....mai bhi wahi bata paawunga jo books me leekha h....is channel pe jo video mai upload karta hu usme koshish yah rahti h ki content kafi deep understanding ki ho....Kabhi cooling tower ka knowledge badhega then soch sakta hu...but not in near future.
Bhai mass transfer ki complete series banane ka plan nahi h mera...uski jarurat bhi nahi h....kyoki nptel pe pahle se hi achhe lecture series available h....Mai to unhi topic pe video banawunga jiska internet pe koi achha video nahi h
So sir can you please at least tell us which lectures of sir nishith verma's are important with point of view of gate kyunki 40 lectures sir bahut time consuming ho jata hai...
Sorry for late reply. I forgot about this. You should have reminded me. Anyways. In my College Mass transfer topics Absorption,Stripping,Distillation,Drying,Humidification & Dehumidification And Packed bed was taught very well. So I studied these topics from my class notes supplemented by Geancoplis. Diffusion etc. was not taught well. So, I watched Prof. Nishith Verma of IIT Kanpur lectures. I watched Lec 1,2,4,5,6,9. I also watched Adsoption lectures (Lec 30-34). These lectures are not important for GATE, I watched them because I had time and I used to enjoy study. As far was GATE is concerned only 1-2 questions has been asked on Adsoption in last 20 years. I do not know about 2015-2018 GATE papers. I also watched Prof. V. Kumarnan IISc Bangalore lectures (Lecture 1-9, which includes dimensionless numbers). I found them very useful for GATE and I highly recommend these lectures to any one who want to understand Chemical Engineeing in depth. Thanks.
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