Refrigerant Mass Flow
Compute the refrigerant mass flow needed in a cycle, ṁ = refrigerating capacity / refrigerating effect, dividing the desired cooling load (kW) by the specific refrigerating effect (kJ/kg, the enthalpy absorbed per kilo at the evaporator). It is how much refrigerant must circulate per second to meet the demand — the basis for sizing the compressor, the piping and the system gas charge. Enter the refrigerating capacity and the refrigerating effect.
Resultado
—
Vazão mássica de refrigerante
Quanto refrigerante precisa circular por segundo para atender a uma demanda de frio? A resposta é ṁ = capacidade frigorífica / efeito refrigerante. A capacidade frigorífica (kW) é o calor que se quer remover; o efeito refrigerante (kJ/kg) é quanto cada quilograma de refrigerante consegue absorver no evaporador (a diferença de entalpia entre a saída e a entrada do evaporador). Dividindo um pelo outro, sai a vazão mássica (kg/s) necessária. Esse é um dos cálculos centrais do projeto de um sistema de refrigeração, porque a vazão mássica determina quase tudo a jusante: o tamanho do compressor (que precisa bombear essa massa), o diâmetro das tubulações (para a velocidade do fluido ficar adequada — rápido demais gera ruído e perda de carga, lento demais não arrasta o óleo de volta), a capacidade da válvula de expansão e a carga de gás do sistema. Refrigerantes com efeito refrigerante alto (como a amônia) precisam de menos vazão mássica para a mesma capacidade, permitindo tubos menores — uma das razões de sua popularidade industrial. Informe a capacidade frigorífica e o efeito refrigerante.
Related Tools
Subcooling Degree
Compute the subcooling of a refrigeration system, ΔT = T_condensation(saturation) − T_liquid, how much colder the liquid refrigerant is than its saturation temperature at the condenser pressure. Proper subcooling (typically 4–8 °C) ensures pure liquid (no vapor bubbles) at the expansion-valve inlet, avoiding flash gas that reduces capacity. It increases the refrigerating effect. Enter the saturated condensation temperature and the liquid temperature.
Belt Conveyor Capacity
Calculate the mass flow capacity of a belt conveyor, Q = A × v × ρ × 3600, from the cross-section area of the load on the belt A (m²), the belt speed v (m/s) and the material's bulk density ρ (t/m³). The result, in tonnes per hour, is the conveyor's transport capacity — essential equipment in handling ore, gravel, grain and coal. The load area depends on the belt width, the material's surcharge angle and the idler configuration. Wider, faster belts and denser materials raise the capacity. It is the basis of conveying system design. Enter the load area, the speed and the density.
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.
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.