Compression - Revision history

Michel Lamontagne at 13:22, 13 May 2019

2019-05-13T13:22:27Z

2019-05-13T13:20:38Z

2019-05-13T13:10:44Z

Calculations

2019-05-13T13:08:55Z

2019-05-13T13:07:39Z

2019-05-13T12:57:30Z

2019-04-18T20:32:39Z

2019-04-18T20:32:14Z

2019-04-18T00:53:14Z

2019-04-18T00:24:03Z

← Older revision		Revision as of 13:22, 13 May 2019
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−	[[File:Collector Scene 3.jpg\|thumb]]	+	[[File:Collector Scene 3.jpg\|thumb\|A large centrifugal compressor for atmospheric compressing. Very hypothetical.]]
	Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for [[In-situ resource utilization\|in-situ]] resources utilization. There are other methods, such as thermal adsorption but they are generally less efficient.		Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for [[In-situ resource utilization\|in-situ]] resources utilization. There are other methods, such as thermal adsorption but they are generally less efficient.

← Older revision		Revision as of 13:20, 13 May 2019
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		+	[[File:Collector Scene 3.jpg\|thumb]]
	Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for [[In-situ resource utilization\|in-situ]] resources utilization. There are other methods, such as thermal adsorption but they are generally less efficient.		Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for [[In-situ resource utilization\|in-situ]] resources utilization. There are other methods, such as thermal adsorption but they are generally less efficient.

@@ Line 76: / Line 76: @@
 Table 1, gas molecular weight, many gases are diatomic in their natural state.
-== Calculations ==
+==Calculations==
-The following link provides an [[:File:Marspedia-Compression.xlsx|Excel spreadsheet for compression calculations]].
+The following link provides an [[:File:Marspedia-Compression.xlsx|Excel spreadsheet for compression calculations]], and an example for the compression of the martian atmosphere.
 ==References==
 <references />

@@ Line 76: / Line 76: @@
 Table 1, gas molecular weight, many gases are diatomic in their natural state.
-[[:File:Marspedia-Compression.xlsx|Excel spreadsheet for compression calculations]]
+== Calculations ==
 ==References==
 <references />

@@ Line 74: / Line 74: @@
 |20
 |}
-Table 1, gas molecular weight, many gases are diatomic in their natural state
+Table 1, gas molecular weight, many gases are diatomic in their natural state.
-== References ==
+[[:File:Marspedia-Compression.xlsx|Excel spreadsheet for compression calculations]]
 <references />

@@ Line 19: / Line 19: @@
 But when the compression becomes significant, we need to take into account the work done in compressing the gas.  The equation for adiabatic compression (no heat loss at the compressor) is still not exact, but it is OK for settlement design.
-)  W=(y/y-1)*[(Q*R*T)/(w*n)]*[(P<sub>2</sub>/P<sub>1</sub>)<sup>(y-1/y)</sup>-1]
+)  W=(y/y-1)*[(mf*R*T)/(w*n)]*[(P<sub>2</sub>/P<sub>1</sub>)<sup>(y-1/y)</sup>-1]
 Where:
@@ Line 27: / Line 27: @@
 y= Heat capacity ratio<ref>https://en.wikipedia.org/wiki/Heat_capacity_ratio</ref> of the working fluid = 1.67 for noble gases = 1.41 for other gases, including air
-Q= mass flow (kg/s)
+mf= mass flow (kg/s)
 R= Ideal gas constant = 8.314 J/kg mole
@@ Line 75: / Line 75: @@
 |}
 Table 1, gas molecular weight, many gases are diatomic in their natural state
 <references />

← Older revision		Revision as of 20:32, 18 April 2019
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−	Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for in-situ resources ~~utilisation~~. There are other methods, such as thermal adsorption but they are generally less efficient.	+	Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for [[In-situ resource utilization\|in-situ]] resources utilization. There are other methods, such as thermal adsorption but they are generally less efficient.

	'''Adiabatic Compression power equation'''		'''Adiabatic Compression power equation'''

@@ Line 23: / Line 23: @@
 Where:
-W= power (Watts),
+W= power (kW),
 y= Heat capacity ratio<ref>https://en.wikipedia.org/wiki/Heat_capacity_ratio</ref> of the working fluid = 1.67 for noble gases = 1.41 for other gases, including air

@@ Line 1: / Line 1: @@
-Adiabatic compression
+Adiabatic compression by mechanical means is the most common model for compression of the martian atmosphere for in-situ resources utilisation.  There are other methods, such as thermal adsorption but they are generally less efficient.
-'''Compression power equation'''
+'''Adiabatic Compression power equation'''
 When the compression is small, we can get away with the following simple equation:
@@ Line 75: / Line 75: @@
 |}
 Table 1, gas molecular weight, many gases are diatomic in their natural state

@@ Line 19: / Line 19: @@
 But when the compression becomes significant, we need to take into account the work done in compressing the gas.  The equation for adiabatic compression (no heat loss at the compressor) is still not exact, but it is OK for settlement design.
 )  W=(y/y-1)*[(Q*R*T)/(w*n)]*[(P<sub>2</sub>/P<sub>1</sub>)<sup>(y-1/y)</sup>-1]
 Where:
@@ Line 25: / Line 25: @@
 W= power (Watts),
-y= Heat capacity ratio of the working fluid = 1.67 for noble gases = 1.41 for other gases, including air
+y= Heat capacity ratio<ref>https://en.wikipedia.org/wiki/Heat_capacity_ratio</ref> of the working fluid = 1.67 for noble gases = 1.41 for other gases, including air
 Q= mass flow (kg/s)
@@ Line 35: / Line 35: @@
 w= Molecular weight of the gas (g/mole)
-n= Efficiency
+n= Efficiency (from 0,null to 1, perfect)
 P<sub>2</sub>= Absolute gas pressure after the compressor (kPa)