Compressor Volumetric Efficiency
Compute a compressor's volumetric efficiency, ηv = (actual suction flow / volumetric displacement)·100%, the fraction of the piston-swept volume that actually pumps gas. Losses come from clearance volume (gas that re-expands), suction reheating and leakage. It drops as the compression ratio rises. It is a key indicator of compressor performance. Enter the actual suction flow and the volumetric displacement.
Result
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Eficiência volumétrica do compressor
Um compressor alternativo nunca aspira todo o volume que seus pistões varrem — há perdas inevitáveis. A eficiência volumétrica ηv = (vazão real aspirada / deslocamento volumétrico)·100% mede essa fração efetiva. As perdas vêm de várias fontes: o espaço morto (o pequeno volume que sobra no topo do cilindro quando o pistão chega ao fim — o gás ali comprimido reexpande na descida, ocupando espaço que deveria aspirar gás novo); o reaquecimento do gás frio ao entrar no cilindro quente (que o expande, reduzindo a massa aspirada); vazamentos pelas válvulas e anéis; e perdas de carga na sucção. O fator mais influente é a razão de compressão: quanto maior, mais o gás do espaço morto reexpande, e mais a ηv cai — em razões muito altas, a ηv pode despencar a ponto de inviabilizar a compressão num único estágio (daí o duplo estágio em baixas temperaturas). A ηv liga o deslocamento teórico à vazão real e, portanto, à capacidade frigorífica efetiva do sistema. Informe a vazão real aspirada e o deslocamento volumétrico.
Related Tools
Compressor Volumetric Displacement
Compute the volumetric displacement of a reciprocating compressor, Vd = (π/4)·D²·L·n, the volume swept by the pistons, from the cylinder bore (D), the stroke (L) and the number of cylinders (n). It is the compressor's 'displacement' — the theoretical volume aspirated per revolution, which, multiplied by the speed and the volumetric efficiency, gives the actual flow. It defines the compressor capacity. Enter the bore, the stroke and the number of cylinders.
Real COP / Carnot Efficiency
Compute a refrigerator's second-law efficiency, η = (real COP/Carnot COP)·100%, comparing the measured real COP with the theoretical Carnot maximum for the same temperatures. It shows how close to thermodynamic perfection the system operates: real systems are typically at 40–60% of Carnot, due to compression irreversibilities, pressure losses and finite temperature differences in the heat exchangers. Enter the real COP and the Carnot COP.
Superheat Degree
Compute the superheat of a refrigeration system, ΔT = T_suction − T_evaporation(saturation), how much hotter the refrigerant vapor is than its saturation temperature at the evaporator pressure. Proper superheat (typically 5–10 °C) ensures only vapor (no liquid) reaches the compressor, protecting it from liquid slugging. Too much superheat reduces capacity. It is controlled by the expansion valve. Enter the suction and saturated evaporation temperatures.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.