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Rolling Piston Compressor Operation and Displacement Calculator
Rolling Piston Compressor Operation and Displacement Calculator
Rolling-piston, or fixed-vane, rotary compressors are used in air-conditioning units in capacities up to about 30 kBtu/h and refrigerators up to 2.5 hp. This type of compressor uses a roller mounted on the eccentric of a shaft with a single vane or blade suitably positioned in the nonrotating cylindrical housing, generally called the cylinder block. The blade reciprocates in a slot machined in the cylinder block. This reciprocating motion is caused by the eccentrically moving roller.
Figure 1 - Fixed-Vane, Rolling-Piston Rotary Compressor
(Republished with premission from ASHRAE)
Geometrical displacement for this compressor can be calculated from the following equation:
Vd = π H ( D2 - d2 ) / 4
where
Vd = displacement (in3, mm3),
H = cylinder block height (in, mm),
D = cylinder diameter (in, mm),
d = roller diameter (in, mm)
Typical Rolling-Piston Compressor Performance
| Compressor speed | 3450 rpm |
| Refrigerant |
R-22 |
| Condensing temperature |
130°F |
| Liquid refrigerant temperature |
115°F |
| Evaporator temperature |
45°F |
| Suction pressure |
90.7 psia |
| Suction gas temperature |
65°F |
| Evaporator capacity |
12,000 Btu/h |
| Energy efficiency ratio |
11.0 Btu/W·h |
| Coefficient of performance |
3.22 |
| Input power | 1090 W |
Related White Papers
Motion Analysis of Rolling Piston in Rotary Compressor (Free Membership required)
Source
- ASHRAE HVAC Handbook, 2016
- Motion Analysis of Rolling Piston in Rotary Compressor T. Yanagisawa T. Shimizu I. Chu K. Ishijima Purdue University
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