Question

Q3/Sixteen cylinders' compressor using R-407C running at 1500 RPM, produce refrigeration capacity of 75 TR. The saturated suction temperature is 5 °C and condensing temperature of 50 °C, the condenser sub-cooled by 5 °C. The cylinder bore is 67 mm and the piston is 67 mm. Find the clearance volumetric efficiency if the clearance volume is 4.8 percentage, actual volumetric efficiency, and the actual work of the compressor Note: (compression efficiency 74.68%). The student should attach the P-h diagram with the answers. 1251

Answer 1

Gven no of lindeis IS steed IScorpm Capacity of evaporatol Te = s'c Temparature condlense tempaatune ,Tcso subccolimg AT-s'e length Lミb:67mm Compiess effi ciency n u68-1 T-S and -H Diagram Drawimg the P1opexties Enthalrs entropy volume T CHR) Atn ihg Sg Sf s .O44 207-3 416.6 o261 183q 65 1 o Olly 2819 1-7437 2186.9 1- 269 433.9 4s 2t2.5 6.83 K3|k

cleaxance atio clearan ce volumetic effici ency () PH Pe L+CC 1t o Ou8- o o ( 216 657 o9343 nu)c 93-437 mas flow (h-he) O RC = from table hi u16 6 ŁJ JEG h hs CIsanthalpic process) hs hf at us' ( s subcooling) h6272-5 s Fhom earC 45 * 3 5= M 416 6-232-s) 1-8217 9 deal work compressa)

2 8217 Cuu8 6 416 6) $8.12kw Actual l hc s8.22 17-96 Ew