7/24/2019 Psychrometric Chart by Prashant

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INTRODUCTION

Psychrometrics and Psychrometric chart:-

Psychrometrics !sychrometryis the st"dy o# the!ro!erties o# $ir.

Psychrometric ch$rt is the %r$!hic$lre!resent$tion o# $ir !ro!erties $nd condition.Psychrometric ch$rt sim!li&es the me$s"rement

o# $ir !ro!erties.Air !ro!erties incl"de dry'(l"( tem!er$t"re) *et '

("l( tem!er$t"re) rel$ti+e h"midity) de* !oint$nd %r$ins o# moist"re.Air condition incl"de tem!er$t"re) h"midity $nd

condens$tion !oint ,or de* !oint.

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PSYCHROMTRICS TRMSDry!"#$" tem%erat#re&! it is the tem!er$t"re o#

the $ir $s me$s"red (y $n ordin$ry thermometer.

'et!"#$" tem%erat#re&! it is the tem!er$t"re o#the $ir $s me$s"red (y $n ordin$ry thermometer*hose %l$ss ("l( is co+ered (y $ cloth so$.

Re$ati(e h#midity&! it is the r$tio o# $ct"$l $mo"nto# moist"re !resent) to the $mo"nt o# moist"re the$ir co"ld hold $t the %i+en tem!er$t"re.

Grains o) moist#re&! it is the "nit o# me$s"remento# the $mo"nt o# moist"re in the $ir.

De* %oint tem%erat#re&! it is the tem!er$t"re $t

*hich moist"re condenses on $ s"r#$ce.

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US O+ PSYCHROMTRICSCHART

I# the +$l"e o# $ny t*o o# the !sychrometric terms$re no*n the +$l"e o# $ny other term c$n (e#o"nd on the !sychrometric ch$rt.

The !sychrometric ch$rt is sh$!ed lie $ (oot .

Sole is the dry-("l( tem!er$t"re sc$le.Inste! c"r+e is the *et-("l( tem!er$t"re $nd de*

!oint tem!er$t"re.

/"midity lines $re $!!roim$tely

P$r$llel to the inste! c"r+e $nd

#ollo* $lon% the side o# the sole.

The %r$ins o# moist"re sc$le is

$lon% the ($c o# the shoe.

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