Questions tagged [compressors]

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What is the difference between side-channel/regenerative/ring/vortex blowers?

I am looking to write a Wikipedia article for side-channel blowers, but I have some big confusions that are not being alleviated by my attempts at research. There are certainly two distinct ways that ...
TWiz's user avatar
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Is it possible to use two sets of stator blades after each set of rotor blades in an axial compressor?

I am currently designing an axial air compressor for a project, and I require the stator blades to reduce the velocity from 50m/s to 2.5 m/s in each stage of the stator. This requires a ratio of the ...
Manish S's user avatar
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Explanation of phases of fridge cycle from power draw (power factor, reactive and active power)

I've got this power draw graph of my fridge during a couple of cycles. The power factor axis is on the left, active and reactive power axis in watts/VAr on the right. I'd like to understand the phases ...
JavierG's user avatar
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Aerodynamic design and characteristic of fan vs blower

I just learnt about the difference between a fan and a blower, namely the former providing high flow rate at very low outlet pressure (<1.1*inlet) and the latter providing a slightly increased ...
temporary_pigeon's user avatar
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Can a scroll compressor be used to generate power?

Scroll compressors are efficient, reliable, and a fill a pressure/flow niche in the array of available compressor technologies. However, I have never seen one used the other direction for generating ...
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Why does flow capacity of axial turbine decreases with increasing RMP?

when studying the compressor map and the turbine map of a gas turbine, I noticed that the flow capacity of the compressor increases with speed increase (RPM) and the flow capacity of the turbine ...
GRANZER's user avatar
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Why are double-acting reciproating compressors more efficient than single-acting ones?

On many websites, I read that double-acting reciprocating compressors are more efficient than single-acting compressors. These sources say it's because they complete two compression cycles on each ...
Daniel's user avatar
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Compression phenomenon in Axial flow compressor

It is quite difficult for me to visualize how axial flow compressors work, as in, how air gets compressed by just flowing through a series of aero-foil shaped stator and rotor blades. How and where ...
Prasanna B's user avatar
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Atlascopco screw compressor unload abnormal sound

We are facing an issue in our GA 75 FF model compressor. During the unload time the compressor is making some abnormal noise, but during the load it is working fine. When the machine is unloaded after ...
user42477's user avatar
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1 answer
847 views

How to find work done by compressors

Which one is correct method to find work done by a isentropic compressor? Method-1: Compressor power = mCpdT Where m = mass flow rate Cp = specific heat at constant pressure dT = Temperature ...
Mirajul Momin's user avatar
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Can rubber be used as the membrane in a diaphragm compressor with a 1:10 or higher compression ratio?

I've been investing time learning about diaphragm compressors and I can't understand how this particular type of compressor can have a 20:1 compression ratio, and what material could stretch that much ...
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For axial flow compressor, at constant speed, does the required power changes as pressure ratio change?

For an axial compressor running at constant speed/rpm, does the power change as the pressure ratio increases and mass flow decreases (going up a constant speed line of a compressor map)? I am assuming ...
GRANZER's user avatar
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What is the optimum layout for a hydrogen compressor, that would have least wear and tear on the compressor?

I have been investing time in understanding the layout/schematic of a compressor that would be used for compressing hydrogen to high pressure ratings. It's not clear to me what is the best design - ...
Boolean's user avatar
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How do dual inverter compressors save power and why can they have variable speeds?

As I understand it, most modern air conditions have a rotary compressor with a single rolling piston that's offset from the axis of rotation, causing heavy vibration and limiting RPMs. It then makes ...
Tyler V.'s user avatar
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Why do axial compressor stages have to get smaller and smaller to increase fluid pressure?

Why can't we design axial compressor stages of which have the same length? We are adding kinetic energy to fluid and then get it back as potential energy-static pressure. So why do we need that they ...
Jawel7's user avatar
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Can I use a rotary screw compressor used in refrigeration as a steam compressor?

I need to distill water. Vapor compressors are the best choice. However, difficult to find small scale vapor compressor. I am exploring the feasibility of rotary screw compressor used in refrigeration....
Amit Agarwal's user avatar
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2 answers
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Can a compressor give the same discharge pressure even if suction pressure varies?

The task is to maintain compressor discharge pressure at 200 bars. The inlet pressure varies with time from 200 bars to 10 bars (emptying a compressed air tank and compressing to transfer it to ...
Aron PE's user avatar
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Are there compressors that can compress both water and water vapor?

I noticed while reading about compressors that they have various types and are generally made for a specific function. However, are there types of compressors (or pumps) that can compress both water ...
Belal Bahaa's user avatar
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What is the critical buckling force needed to be applied on a system of made out of two parts?

What is the critical buckling force needed to be applied on a system of made out of two parts? The parts of the system are as depicted in the picture: incompressible elastic beam - on top ...
Avishai Barnoy's user avatar
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A 40L compressed air cylinder at 100 bar is emptied in pulses at the rate of 41kg/s. How many such cycles would it take to empty the cylinder? [closed]

I am constructing a blowback gas system where clogged debris needs to be removed with compressed air using compressed air cylinder. 40L compressed air cylinder at 100bar pressure is available as ...
Yadunandan's user avatar
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Pneumatic pressure sensing in a moving air compressor line

I am building an automatic control system for an compressor that stops at a designated pressure. Here's a rough sketch of the system: The compressor should receive the on signal from the ...
Alex's user avatar
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What drives the mass flow rate in axial turbofan between the compressor and the turbine when compressor is fully choked?

I haven't found the answer in the forum or elsewhere, but maybe I have searched badly, in which case please forgive me in advance. For a steady nominal operation of a turbofan, I have heard that the ...
Jonses's user avatar
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How does compressor ensure that rfgnt exiting the compressor exits at sufficient pressure such as its condensation tmp is always > otsd air temp?

I have very basic knowledge of the refrigerant cycle. I am talking about a Split system Home AC with an air cooled condenser. Assume a basic AC reciprocating or scroll compressor (i.e NOT a variable ...
Sanjay Biswas's user avatar
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What contributes to the energy cost of multistage compression at high discharge pressures?

I'm getting into hydrogen compression from a theoretical point of view and am looking for a model to describe the energy requirements. I've gathered, that hydrogen is often compressed with piston ...
Eike's user avatar
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Compressor ratio and addition of battery cooling loop (chiller) in the existing HVAC circuit

Imagine if i want to change my IC car to an electric vehcile, with the obvious addition of battery, how can i use existing HVAC loop to cool the battery using a chiller. HVAC was obviouly desinged ...
Bineet's user avatar
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Retrofitting an old compressor with VFD

For an AC unit, the compressor - GK151PAB - Hermetic type, Permanent split condenser,2 pole, Single phase, Induction motor. This much I know about it. What else do I need to know and how do I find out ...
kellogs's user avatar
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1 answer
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Axial compressor: How does it work that the stator vanes diffuse the flow to build up pressure, but also the flow area reduces?

I'm reading about how the stator vanes are diffusors, which diffuse the air flow in a axial compressor to a larger flow area to build up pressure BUT at the same time the compressor shows its overall ...
Riccardo's user avatar
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56 views

How can rod load reversal points determine leakage of valves in reciprocating compressors?

One of the common parameters that is monitored in reciprocating compressors is the net rod load. How can they show which valve has leakage? For example, if the suction valve of the crank end (CE) has ...
Ali Hosseinli's user avatar
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49 views

Understanding air compressor CFM, PSI

I need some help in choosing the right air compressor for my airtable and understanding how CFM and PSI can be used to calculate the system. I read standard google links, pressure drop per linear ft, ...
Vortex's user avatar
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3 answers
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Is there a good way to passively dry air in the input of a vacuum pump?

I'm using an a/c compressor as a vacuum pump for small projects that don't need a good vacuum pump, and I'm looking for a way to dry the air in the input, to prevent water from mixing with the oil ...
user2934303's user avatar
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1 answer
164 views

how to interpret plots in ISO 10816-8?

In ISO 10816-8 for reciprocating compressors, there are some plots that show the allowable RMS vs. frequency for every part of a compressor. However, in the text of the standard, it is mentioned that ...
Ali Hosseinli's user avatar
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3 answers
117 views

Confused about how combustor pressure is lower than compressor exit pressure in turbomachinery?

I understand the compressor exit pressure is the highest pressure in all of the turbomachinery, and the combustor is a constant pressure process, and since the combustor P is lower than compressor ...
kaz's user avatar
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Why is pressure in a common rail fuel system so much higher than in an air compressor or supercharger?

Superchargers in cars are bulky, expensive, consume considerable amount of engine's power and yet they generate only about 6-9 psi boost. On the other hand, modern common rail diesel engines inject ...
ciamej's user avatar
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4 votes
3 answers
403 views

Specific heat at constant volume used in non constant volume processes

I have commonly seen that the work for an isentropic compression is written as: $$ W_{in} = c_{v}(T_1 - T_2) $$ What confuses me is that since it is a compression (volume is changing) why do we use ...
RMS's user avatar
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2 votes
1 answer
62 views

Is there a positive displacement compressor that can rival axial compressors in terms of air mass flow to weight ratio?

Is there a positive displacement compressor that can rival axial compressors in terms of air mass flow to weight ratio?
Francis L.'s user avatar
0 votes
1 answer
142 views

What is the correct method to remove or tighten this splined "nut"?

This photo shows the input shaft of an air compressor head. The splined cog-looking disc around the shaft is actually a sort of threaded nut which screws into the larger disc around it. It serves to ...
StayOnTarget's user avatar
1 vote
2 answers
199 views

why do centrifugal compressors have curved blades?

Why are centrifugal air compressors built with backward curving blades?
Francis L.'s user avatar
2 votes
1 answer
57 views

Slow Driving an Air Compressor

Do off-the-shelf air compressors have minimum driving speeds, below which they cannot build the necessary pressure? Reciprocating compressors and scroll compressors are available—is there a difference ...
PProteus's user avatar
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1 answer
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Why do high pressure multistage air compressor have different piston diameter sizes? [closed]

I meant like this kind of compressor https://www.bauer-kompressoren.de/fileadmin/_processed_/csm_compressor-block-junior2_b92a76a02e.jpg also would the compressor reach high pressure if the diameter ...
richardo tong's user avatar
1 vote
0 answers
98 views

Motor part winding start

I have a BITZER compressor type 4GE-23Y-40P, with a part winding start option Nennspannung = nominal voltage = 380-420 Frequ = frequency = 50 Betr. strom = maximal operating current = 43.9 ...
B.Mohammed's user avatar
4 votes
0 answers
97 views

Is there any side effect to soft start an AC motor?

I have a ground to water heat pump for my home heating/cooling (scroll compressor). The 3-phase 15kW-peak motor can be soft started but this option is off by default. I'm aware of all the positive ...
Kyle_the_hacker's user avatar
-1 votes
3 answers
3k views

Is it safe to use a 125PSI rated auxiliary air tank with a 150PSI air compressor?

I have a small, 5 gallon, pancake compressor which has a maximum 150PSI rating. Unfortunately, it doesn't have the air capacity to power the demands of an HVLP paint sprayer or a die grinder without ...
user148298's user avatar
-1 votes
1 answer
54 views

How to decrease Nitrogen gas consumption in Iron & Steel Plant? [closed]

I need to decrease nitrogen gas consumption in iron & steel plant. Currently it's not possible to measure every dot from steel mill to determine real usage so they use what air separation unit ...
chemeng10's user avatar
1 vote
1 answer
848 views

Why do centrifugal compressors have a higher compression ratio per stage than axial compressors?

It is common for centrifugal compressors to have a pressure ratio of one stage of 3, while axial compressors often have compression ratio per stage of around 1.25. What is the source of that ...
Francis L.'s user avatar
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0 answers
322 views

Work done by compressor to fill a tank

A reciprocating air compressor is used to fill rapidly a $3m^3$ tank at $30°c$ and $1\ bar$. The filing process is governed by $pv^{1.4}=constant$. The effects of kinetic energy may be neglected. The ...
Anivarth's user avatar
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2 votes
3 answers
363 views

How do stators in axial compressors work?

How do the stators in axial compressors convert kinetic energy to pressure? Is this equivalent to a water hammer?
Francis L.'s user avatar
0 votes
2 answers
152 views

Regarding design of a compressed air delivery system based on a screw air compressor

I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
afterburner77's user avatar
1 vote
1 answer
120 views

Do stators in axial flow compressors have airfoil geometry?

In axial flow compressors the role of a stator is to gradually change the direction of flow to exchange some of the kinetic energy of the flow into pressure. Therefore it stands to reason that they do ...
Francis L.'s user avatar
1 vote
2 answers
75 views

why not put the compressor right next to the evaporator?

the cold line from evaporator to compressor will gain tons of heat on a super hot day even with insulation. if they put the compressor right outside the evaporator, both of the long lines will be hot ...
user24144's user avatar
1 vote
0 answers
21 views

Ignoring Mechanical Material Properties and Design Implications, in a Compressor, does the Thermal Density of the Blades Affect Efficiency?

Consider an ideal adiabatic compressor, ignoring the remainder of the thermodynamic cycle. In this case, the heat flow q into and out of the compressor itself is zero, by definition of adiabatic ...
Richard Bonnardel's user avatar