How to use Psychrometric chart and EES for HVAC Problems.

This video shows how you can solve HVAC problems using either Psychrometric chart or EES (Engineering Equation Solver). To review how to use EES and get familiar with the first law of thermodynamics watch these two videos first:
Introduction to EES: • How to use EES. Basic ...
Complete mastery of the 1st of law of thermodynamics: • Introduction to Heat T...
This video shows how you can find enthalpy, specific volume, dewpoint, wetbulb temperature, drybulb temeperature, humidity ratio, and relative humidity on the Psychrometric chart and in EES.
After finding these values, this video shows how to solve Example 14-6 from Cengel's Thermodynamics book (8th Edition)

[@desalegnkassa5485]

Thank you professor for your detailed and clear lecture

[@professorbehrang]

You’re welcome!

[@Khalid-mf8ck]

Thanks for the video, I have one question regarding the air. i.e. if the air contain some other solution (like NMP for cathode drying) then how to define and calculate enthalpy and also condensation rate at evaporator ?

[@robertanex4535]

The energy balance result is different from the textbook solution because the textbook accounts for the enthalpy of the condensed (saturated) liquid water that leaves the system. The book finds that the heat removed from the system is 511 kJ/min instead of 518 kJ/min because it includes the enthalpy balance on the air in, air out, and saturated water that is removed. (Not because this solution uses "more accurate values".) The energy balance should include the energy of BOTH streams that leave the system (moist air and saturated water) as well as the heat interaction.

[@professorbehrang]

Thanks for watching and your comment.

[@EarthenDemon126]

This was not covered when I was his student in 2017. Is this new to the curriculum?

[@vinceesperanza250]

i guess this is covered only when youre in mechanical engineering.

[@EarthenDemon126]

@@vinceesperanza250 I was a Mechanical Engineering major (B.S.) and I was never taught this.

[@vinceesperanza250]

@@EarthenDemon126 in my country this is taught in HVAC course, a course separate from thermodynamics.

[@اوسحسن-م7ت]

hi..i have a question in different subject if you can help
in evaporative cooling...is it useful to decrease the temp of water spry or water washer
ex: if out air 36c,60%rh..on psy with 90% evaporative efficiency.h ll get a 28c db and 90%rh..
so if i enter a 7c cold water to the washer .will i get a cold air temp....with knowing that in 100%humidity the db is about 27c
thanks

[@professorbehrang]

Yes. If you do the first law analysis and include the enthalpies for a steady state case you can even bring the steady state air temperature down by introducing colder water to it.