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Volumetric Efficiency of Reciprocating Compressor, Refrigeration and Air Conditioning, Mechanical Engineering, GATE Video Lecture
FAQs on Volumetric Efficiency of Reciprocating Compressor, Refrigeration and Air Conditioning, Mechanical Engineering, GATE Video Lecture
| 1. What is volumetric efficiency in a reciprocating compressor? |  |
Ans. Volumetric efficiency in a reciprocating compressor refers to the actual volume of gas that is compressed compared to the theoretical volume. It is a measure of how effectively the compressor is able to compress the gas. A higher volumetric efficiency means that more gas is being compressed, resulting in better performance and higher output.
| 2. How is volumetric efficiency calculated in a reciprocating compressor? | |
Ans. Volumetric efficiency in a reciprocating compressor can be calculated using the following formula:
Volumetric Efficiency = (Actual Discharge Volume / Theoretical Discharge Volume) * 100
The actual discharge volume is the volume of gas that is actually compressed by the compressor, while the theoretical discharge volume is the volume that would be compressed if the compressor had perfect efficiency. By dividing the actual volume by the theoretical volume and multiplying by 100, we get the volumetric efficiency as a percentage.
| 3. What factors can affect the volumetric efficiency of a reciprocating compressor? | |
Ans. Several factors can impact the volumetric efficiency of a reciprocating compressor. These include:
- Clearance volume: The clearance volume is the volume of gas left in the cylinder after the compression stroke. A larger clearance volume can reduce the volumetric efficiency.
- Compression ratio: The ratio of the discharge pressure to the suction pressure affects the volumetric efficiency. Higher compression ratios can lead to lower volumetric efficiency.
- Leakage: Any leakage of gas during the compression process can reduce the volumetric efficiency.
- Temperature: Higher gas temperatures can decrease the volumetric efficiency.
- Mechanical losses: Friction and other mechanical losses in the compressor can also impact the volumetric efficiency.
| 4. How can the volumetric efficiency of a reciprocating compressor be improved? | |
Ans. There are several ways to improve the volumetric efficiency of a reciprocating compressor:
- Minimize clearance volume: By reducing the clearance volume, the amount of gas left in the cylinder after compression can be minimized, leading to higher volumetric efficiency.
- Optimize compression ratio: Adjusting the compression ratio to an optimal level can improve the volumetric efficiency.
- Reduce leakage: Ensuring proper sealing and minimizing any leakage points can help improve the volumetric efficiency.
- Cooling: Cooling the gas before compression can lower its temperature and increase the volumetric efficiency.
- Improve mechanical efficiency: Reducing friction and other mechanical losses in the compressor can also contribute to higher volumetric efficiency.
| 5. How does the volumetric efficiency impact the performance of a refrigeration or air conditioning system? | |
Ans. The volumetric efficiency of a refrigeration or air conditioning system's compressor directly affects its performance. A higher volumetric efficiency means that the compressor is able to compress more gas, resulting in higher cooling or refrigeration capacity. It also indicates that the system is operating more efficiently, as it is utilizing a larger proportion of the available cylinder volume. On the other hand, a lower volumetric efficiency can lead to reduced cooling capacity, increased power consumption, and decreased overall system performance. Therefore, maintaining a high volumetric efficiency is crucial for optimal performance of refrigeration and air conditioning systems.
Text Transcript from Video
all right my dear so today we are going
to discuss about volumetric efficiency
of a reciprocating compressor well as
you know this is one of the most
important topic if you were preparing
complete examination well let's get
started what is it basically it is
generated by ETA V that is why it is
known as volumetric efficiency okay now
what we have ETA V is equal to total or
I must say actual volume actual volume
by theoretical swept volume actual
volume by theoretical swap volume now
what is actual volume it is done by V
theoretical swapped waling PI by 4 into
d square into L into n upon 60 into K
our little new what are these terms now
I can also write mass flow rate specific
volume upon PI by 4 into d square into L
into n upon 60 into K if if number of
cylinders number of cylinders is not
given then take K is equal to 1 if it is
given then what will happen you have to
take how much renders has given in the
question so what will God mass flow rate
this is a specific volume we know 2 pi D
bore diameter length of the stroke and
this is rpm and revolution per
of that cylinder so this is one of the
way or one of the formula to find out
volumetric efficiency of a reciprocating
compression now let's move to the
another method the the notion is same
that is 1 plus c minus c p h up1 PL 1
upon and out let you know what is ph I
already know also what is P L C is
compression C is a sorry not compression
it's clearance the ratio it's clearance
ratio so clearance issue is limited by C
and the which I will define what is
kandace you that means it is the ratio
of clearance volume clearance volume to
the swept volume what is soft swept
volume the total distance moved by the
cylinder and that volume is known as
swept volume clearance volume that
volume is on the the volume which is
after the or I can say the volume which
contained in the top dead center that is
known as B as volume a short volume okay
we see clearance volume so so what is BS
BS means short volume and VC is
clearance volume okay now suppose that
suppose that we have a cylinder okay and
this is T DC this is VDC so this volume
is known as VC and this volume is known
as PS hope you understand okay
now this is known as clearance ratio now
what is pH of what is PL basically for
understanding this thing and is
polytropic index hope you know about
this okay now what is pH and what
p.m. this is important to understand so
let's go to the TS diagram of BC RS
cycle suppose that this is the TS
diagram one two three four and graphene
is moving like this okay now this is a
condenser and this is here we got
evaporator
so obviously Hubbert attempt Liberator
pressure is lower pressure condenser
pressure is higher pressure so this is
all about higher pressure and lower
pressure
okay so volumetric efficiency of the
reciprocating compressor to find out
this we need to use P higher & peele
lower okay and I will understand how you
can calculate volumetric efficiency so
we are having two ways to find out
volumetric efficiency one is this one
and that one is this one okay I hope you
understand the topic and thanks for
watching hope to see you again in my
next video bye
to discuss about volumetric efficiency
of a reciprocating compressor well as
you know this is one of the most
important topic if you were preparing
complete examination well let's get
started what is it basically it is
generated by ETA V that is why it is
known as volumetric efficiency okay now
what we have ETA V is equal to total or
I must say actual volume actual volume
by theoretical swept volume actual
volume by theoretical swap volume now
what is actual volume it is done by V
theoretical swapped waling PI by 4 into
d square into L into n upon 60 into K
our little new what are these terms now
I can also write mass flow rate specific
volume upon PI by 4 into d square into L
into n upon 60 into K if if number of
cylinders number of cylinders is not
given then take K is equal to 1 if it is
given then what will happen you have to
take how much renders has given in the
question so what will God mass flow rate
this is a specific volume we know 2 pi D
bore diameter length of the stroke and
this is rpm and revolution per
of that cylinder so this is one of the
way or one of the formula to find out
volumetric efficiency of a reciprocating
compression now let's move to the
another method the the notion is same
that is 1 plus c minus c p h up1 PL 1
upon and out let you know what is ph I
already know also what is P L C is
compression C is a sorry not compression
it's clearance the ratio it's clearance
ratio so clearance issue is limited by C
and the which I will define what is
kandace you that means it is the ratio
of clearance volume clearance volume to
the swept volume what is soft swept
volume the total distance moved by the
cylinder and that volume is known as
swept volume clearance volume that
volume is on the the volume which is
after the or I can say the volume which
contained in the top dead center that is
known as B as volume a short volume okay
we see clearance volume so so what is BS
BS means short volume and VC is
clearance volume okay now suppose that
suppose that we have a cylinder okay and
this is T DC this is VDC so this volume
is known as VC and this volume is known
as PS hope you understand okay
now this is known as clearance ratio now
what is pH of what is PL basically for
understanding this thing and is
polytropic index hope you know about
this okay now what is pH and what
p.m. this is important to understand so
let's go to the TS diagram of BC RS
cycle suppose that this is the TS
diagram one two three four and graphene
is moving like this okay now this is a
condenser and this is here we got
evaporator
so obviously Hubbert attempt Liberator
pressure is lower pressure condenser
pressure is higher pressure so this is
all about higher pressure and lower
pressure
okay so volumetric efficiency of the
reciprocating compressor to find out
this we need to use P higher & peele
lower okay and I will understand how you
can calculate volumetric efficiency so
we are having two ways to find out
volumetric efficiency one is this one
and that one is this one okay I hope you
understand the topic and thanks for
watching hope to see you again in my
next video bye
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Sep 09, 2025
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