Mechanical Engineering Exam > Mechanical Engineering Videos > Effects of Decreasing Evaporator Pressure on VCRS Cycle, Refrigeration and Air Conditioning, GATE
Effects of Decreasing Evaporator Pressure on VCRS Cycle, Refrigeration
Text Transcript from Video
here so let's get started with another
total that is BC RS cycle effect
parameters effect parameters I must say
so in this total we are going to learn
about what will happen if we will
decrease the evaporator pressure this is
most important my dear if you are
preparing for any company emissions is
computed at the our nation just like Jay
gate then you need to understand most
basic concept of Basya recycle as you
know I have already shared with you
they say recycle is one of the most
important topic for complete examination
so what will happen we are having
evaporator here right condenser here
compressor here and here we have
throttle valve okay now what will happen
we just degrees evaporator pressure like
this so this is one - this is for - now
what will happen here what is that
freeze and effect here for without
decreasing evaporator pressure
refrigerant effect would be h1 minus h4
now if I will say what would we
represent effect if our degree is
evaporator pressure then refrigerant
effect would be H 1 dash minus h4 - now
suppose that this is 1 this is 2
can you guess which one is mode as you
can see here one is greater than 2 that
means represent effect without
decreasing of evaporator pressure is
more than after decreasing evaporator
pressure now lets you work input work
input H 2 minus H 1 for the case 1 and
work input in case of that
and if I will degree is in a better
position then what would be work input
in that case work input would be h2
minus h1 - so what will happen - will be
greater than one as simple as that so a
refrigerant effect will decrease work
input will increase this will increase
and this will disease then what happened
what will happen if I will think about
Co P so as you know CA P is known as
desire effect upon work input if work
input is increases and desire effect
means a reference and effect and
referendum effect is increasing that
means Co P will be what Co P will be
what can you guess my dear Co P will be
decrease so I am sorry yeah division and
the refrigerant effect is decreasing
here okay and 0 PG o P will decrease
okay
I have already seen with you refrigerant
if a refrigerant effect will decrease
and work input will increase that means
what will happen Co P will degrees now
let us go to the another section that is
volumetric efficiency what is it 1 plus
si si is clearance ratio - si PS fee
higher by feed over 1 upon n so here
what will happen the volumetric
efficiency will decrease do you know why
because higher will be higher but lower
pressure will be this is a lower
pressure one pressure will decrease that
means this will increase that means the
whole term will what the whole term will
would degrees so what is happening after
decreasing evaporator pressure its
represent effect is decreasing its work
input is increasing it's co P is
decreasing its volumetric efficiency is
decreasing so the whole fact the whole
fact if I will say if someone will say
terms of unity what will happen to the
operating cost of course the operating
cost will be increase because Co P is
decreasing I owe you understand the
concept well thanks for watching and in
my next video I am going to share with
you something amazing which is helped
you a lot
related to this only okay ba ba
total that is BC RS cycle effect
parameters effect parameters I must say
so in this total we are going to learn
about what will happen if we will
decrease the evaporator pressure this is
most important my dear if you are
preparing for any company emissions is
computed at the our nation just like Jay
gate then you need to understand most
basic concept of Basya recycle as you
know I have already shared with you
they say recycle is one of the most
important topic for complete examination
so what will happen we are having
evaporator here right condenser here
compressor here and here we have
throttle valve okay now what will happen
we just degrees evaporator pressure like
this so this is one - this is for - now
what will happen here what is that
freeze and effect here for without
decreasing evaporator pressure
refrigerant effect would be h1 minus h4
now if I will say what would we
represent effect if our degree is
evaporator pressure then refrigerant
effect would be H 1 dash minus h4 - now
suppose that this is 1 this is 2
can you guess which one is mode as you
can see here one is greater than 2 that
means represent effect without
decreasing of evaporator pressure is
more than after decreasing evaporator
pressure now lets you work input work
input H 2 minus H 1 for the case 1 and
work input in case of that
and if I will degree is in a better
position then what would be work input
in that case work input would be h2
minus h1 - so what will happen - will be
greater than one as simple as that so a
refrigerant effect will decrease work
input will increase this will increase
and this will disease then what happened
what will happen if I will think about
Co P so as you know CA P is known as
desire effect upon work input if work
input is increases and desire effect
means a reference and effect and
referendum effect is increasing that
means Co P will be what Co P will be
what can you guess my dear Co P will be
decrease so I am sorry yeah division and
the refrigerant effect is decreasing
here okay and 0 PG o P will decrease
okay
I have already seen with you refrigerant
if a refrigerant effect will decrease
and work input will increase that means
what will happen Co P will degrees now
let us go to the another section that is
volumetric efficiency what is it 1 plus
si si is clearance ratio - si PS fee
higher by feed over 1 upon n so here
what will happen the volumetric
efficiency will decrease do you know why
because higher will be higher but lower
pressure will be this is a lower
pressure one pressure will decrease that
means this will increase that means the
whole term will what the whole term will
would degrees so what is happening after
decreasing evaporator pressure its
represent effect is decreasing its work
input is increasing it's co P is
decreasing its volumetric efficiency is
decreasing so the whole fact the whole
fact if I will say if someone will say
terms of unity what will happen to the
operating cost of course the operating
cost will be increase because Co P is
decreasing I owe you understand the
concept well thanks for watching and in
my next video I am going to share with
you something amazing which is helped
you a lot
related to this only okay ba ba
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Apr 21, 2026 Last updated
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