Descriptive Comparison between a Centrifugal & Reciprocating Compressor
Descriptive Comparison between a Centrifugal & Reciprocating Compressor
High speed reciprocating compressor engine driven
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A Method to Estimate the Performance of Reciprocating Compressor
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Objective of this experiment is to conduct performance test on two stage reciprocating air compressor and to plot graphs between Volumetric Efficiency Vs pressure ratio, Adiabatic Efficiency Vs ...
(SSL conditions: 25ºC; 101.325 kPa) 1. A reciprocating air compressor indces 5.!5 " 10#3 m$ o% air per c&c'e at SSL conditions. % te de'i*er& pressre is !20 kPa+ ca'c'ate te ,ork trans%er per c&c'e i% te compression and e"pansion processes are:# (a)
re*ersi-'e po'&tropic+ n 1.2.
(-)
re*ersi-'e adia-atic+ n 1./
(c)
re*ersi-'e isoterma'
2. Air is to -e compressed trog a pressre ratio o% 10:1 %rom SSL conditions. ind te po,er reired %or a %ree air de'i*er& (A) (A) o% 0.05m$s. A'so %ind te rotationa' speed i% te s,ept *o'me is 1/.5 " 10#3 m$. 4e c'earance *o'me is ! per cent o% te s,ept *o'me+ and n 1.3 %or compression and e"pansion. 3. Air is compressed in a reciprocating compressor %rom SSL conditions to a pressre o% 0. 6Pa in one stage. 4e po'&tropic inde" o% compression and e"pansion is 1.3+ and te c'earance *o'me is / per cent o% te s,ept *o'me. Ca'c'ate te ,ork trans%er per kg o% air de'i*ered and te eat trans%er dring compression and e"pansion per kg o% air de'i*ered.
/. A sing'e acting reciprocating compressor rnning at 2/0 7P6 de'i*ers 0.1m$s A. A. n'et conditions are SSL SSL and te de'i*er& pressre pressre is /82 kPa. 4e c'earance *o'me is 5 per cent o% te s,ept *o'me and te compression and re#e"pansion processes are considered re*ersi-'e and go*erned -& te 'a, p91.2 const. Ca'c'ate: (a) te s,ept *o'me; (-) te po,er reired to dri*e te compressor i% its mecanica' e%%icienc& is 85; (c) te ma"imm pressre against ,ic te compressor co'd teoretica''& operate.
5. A sing'e stage reciprocating air compressor is reired to de'i*er m$ min A. 4e indction conditions are 5 kPa and 32 ºC. e'i*er& is at 0. 6Pa and te 'a, %or %or 1.3 te compression and e"pansion processes is: p9 constant. % te c'earance *o'me is 5 o% te s,ept *o'me+ ca'c'ate ca 'c'ate te teoretica' po,er and te *o'metric e%%icienc& -ased e%%icienc& -ased on SSL conditions.
!. A tree stage reciprocating air compressor as a %ree air de'i*er& o% 2.83m$min -ased on SSL conditions. 4e indction pressre and temperatre are 8kPa and 32 ºC respecti*e'&. Ca'c'ate te idea' minimm po,er (stating te assmptions reired) %or a de'i*er& pressre o% 6Pa and an inde" o% compression n 1.3. etermine are te inter stage pressres.
. A %or stage reciprocating compressor takes in air at 1 -ar < 32 ºC and de'i*ers it at 112-ar. 4e inde" o% compression %or eac stage is 1.28 and inter#coo'ing is sed so tat te in'et temperatre is te same %or eac stage. 4e pressre ratios are cosen to gi*e ea' ,ork per stage. etermine te *o'me o% air de'i*ered (at SSL conditions) per k= ,ork inpt+ and te air de'i*er& temperatre.
