Sir! In the process of cooling with dehumidification, dehumidification would not start untill DBT reaches to Dew Point temperature which is 15C in this example. So shouldn't there be first straight horizontal line and then an inclined line from 15C DBT to 14C DBT?
Thank you very much. Your classes are good. Expecting videos on basic of thermodynamics especially the concept of entropy which is very much confusing.
The best explanation so far on RU-vid excellent teaching methods fantastic analogy. Please can you make video How to troubleshoot AHU using real world example by utilising Psychrometric chart?
Sir u please make a video on heating and humidification and dehumidification and that too with the help of an example... because it makes us vry easy to understand
Good Effort sir. Thanks a lot. It's really helpful. Question: If water vapour is present in superheated state in air then why do we not feel excessive heat??
There are two reasons 1) If Vapor is in superheated state, it means that the air is unsaturated. If the Vapor is superheated, It carries lesser pressure and it does not have enough mole fraction of Quantity to have a complete effect on humans. 2) The quantity of water vapor in air is around 0.5 percent on aggregate
Hello Sir, My question is in the process of Cooling with Dehumidification, we know Ms decreases since cooling occur, But does Mv also decreases in this process?, If yes, then why not the increase in Relative Humidity (due to decrease in Ms ) gets nullify (due to decrease in Mv) . I Need to understand How Relative Humidity only Increases although both Mv and Ms decreases in Cooling with Dehumidification process.
Very nice and good explanation sir but when explaining about dew temperature you haven't mentioned that we are decreasing temp but we are keeping the pressure constant. Thank you so much for the video👍
Good explanation sir ... my question is why does water evaporate in evaporative cooler ( what is the reference of this property in psychrometric chart ? ) ... Cause water boiling point in 1 atm pressure is 100 C . Is that mean we decrease pressure inside evaporative cooling chamber ?? Thanks ...
your explanation is superb sir thanks for making the video its a very much helpful video sir . can you make the video for summer air conditioning system
Hello Sir, its indeed a very good explanation. But cooling with Dehumidification - wont the end point after the cooling will have almost 99.0% of RH as it will constantly condensate when the temp is lower and keep the mass of water vapor at saturation value of the water vapor? Also the sensible cooling line will be vertical until it reaches the Dew Point temp then it follows the curve of dew point temp?
Sir,after coil dbt and wet bulb temp are low and Rh is approx 100 percent, means as per your example after ac ia 100 percent ,but human comfort is 50 percent ,pls clear I m little bit confused
no one explain like this .thank you so much sir. i would like to know that range of humidity of human comfort, hot and dry humidity range and hot and humid of humidity range. sir please comment the range of those 3 humidity.
No no listen properly in case of perfect humidification I might have shown straight line....but in case of cooling with dehumidification the line will be inclined heading towards lower temp. As you have said
Sir, in cooling and dehumidification psychometry. DPT as per your example was 15°C, but you marked 14°C to the right side of 100% RH line, I'm bit confused and you marked 9'C on 100%RH, could you please give a clarity to this. And very good explanation sir.
As per example, Air entering-30°C Coil temp-9°C DPT-15°C Exit air temp-14°C Obviously condensation takes place at 14°C since DPT is 15°C, and specific humidity decreases due to losing of water content from air, what about RH then at 14°C? 100% or not? That's my doubt
@@izamnahal8746 It wont be at 100% because when temperature is goes less than DPT its starts condensing. So vapour partially becomes liquid. Then mass of vapour also decreases, which decreases the RH (RH is the ratio of Mv by Ms) For those saturated liquid vapour mixture cases we are interested in finding out by dryness or wetness fraction. So RH dont play major role in this region
Sir in cooling and dehumidification. How can we say that relative humidity increases?? even the capacity of holding moisture decreases because of cooling but moisture content also decreasing because of dehumidification . So we can't say whether decreases or increases.
rajendra karedla see basically this cooling with dehumidification process takes place in room air-conditioner suppose.... There humidity off course decreases alongwith temp. that's why you get the comfort.. And that's why you will see that always some water is dripping from the outside of air-conditioner... That water is extracted from the moist air only.
I have one doubt. What happens to latent heat of condensation during cooling and dehumidification process. Doesn't it increase the temperature of air as in heating and dehumidification process..?
