[Problem 2] Psychrometric Chart | Determine Enthalpies and Calculate Heat added to air per minute
Hi every one in today's session we're going to learn about psychometric chart, How To Read Psychrometry Chart (study of air), Problems on Psychrometric chart in Refrigeration & Air conditioning.
Transcript
00:01Now the next numerical is
00:03in winter AC
00:04air conditioning system
00:05100 meter cube of air per minute
00:07at 15 degree Celsius dry bulb temperature
00:10and 80% relative humidity
00:12is heated until its
00:13dry bulb temperature is
00:1422 degree Celsius
00:16with constant specific humidity
00:18find heat added to the air per minute
00:21so here we have to plot the process
00:23on Psychometric Chart
00:24so first we will write down the data
00:26which has been provided
00:28the given data
00:29properties of air at initial condition
00:31this dry bulb temperature 15 degree Celsius
00:33and relative humidity 80%
00:35and volume of air is
00:36100 meter cube per minute
00:38and the properties of air at
00:39final condition
00:40dry bulb temperature 22 degree Celsius
00:43as we can see that
00:45dry bulb temperature has been
00:46increases from 15 degree Celsius to
00:4822 degree Celsius
00:49from initial to final condition
00:51so here we have to first mark
00:53initial and final condition
00:54on Psychometric Chart
00:56and once it is plotted
00:58it saw the specific enthalpy line
00:59which are inclined
01:00so here we got
01:01H1 some what near to
01:0336.5 kilo joule per kg
01:05and for final condition
01:07that is 22 degree Celsius
01:09dry bulb temperature
01:10we got H2
01:11is 44 kilo joule per kg
01:13and there is another inclined line
01:15which is specific volume line
01:16for initial condition
01:18and it is 0.8274
01:19meter cube per kg
01:21now with the help of given data
01:23that is volume of air at initial condition
01:25which is 100 meter cube per minute
01:27and specific volume which is
01:290.8274 meter cube per kg
01:31and calculate mass of air
01:34now with the help of mass of air
01:35and difference of enthalpies of
01:37initial and final condition
01:38we calculate heat added to air per minute
01:40that is
01:41906.4539 kilo joule