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
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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.
Cold Room Heat Load
Compute the product cooling heat load in a cold room, Q = m·cp·ΔT, from the product mass, its specific heat and the desired temperature change. It is the sensible-heat portion to remove to lower the product temperature — one of the components of the room's total load (which also includes wall transmission, infiltration, lighting, motors and people). It defines the refrigerating capacity needed. Enter the mass, the specific heat and the ΔT.
Solids Mass Flow (Dredge)
Calculate the mass flow of solids transported by a dredge or pipeline, ṁ_s = Q·C_v·ρ_s, from the total slurry flow Q (m³/s), the solids volumetric concentration C_v (fraction) and the solids density ρ_s (kg/m³). Solids mass flow is the MASS of useful material transported per unit time (kg/s, or tonnes per hour), the production indicator used when TONNAGE matters — the typical case of ore transport by pipeline (measured in t/h of dry ore) and mineral processing. It is the product of three factors: the slurry flow (pump capacity), the solids concentration (how 'loaded' the slurry is) and the solids density (iron ores, for example, are very dense, ~5000 kg/m³, so little volumetric concentration already gives high tonnage). Mass flow, integrated over time, gives the total transported tonnage, the basis of billing and operational mass balance. Optimizing it — maximizing tonnage per unit pumping energy — is the central goal of pipeline operation, which moves hundreds of millions of tonnes of ore per year over long distances far more energy-efficiently than trucks or trains. Enter the slurry flow, the volumetric concentration and the solids density.
Required Fire Flow
Calculate the water flow required for a firefighting system, Q = area × application rate, multiplying the operating area (m²) by the required application density (L/min per m²). The result, in L/min, is the minimum flow the sprinkler or spray system must deliver over the most unfavourable area to control the fire. The application rate depends on the occupancy's hazard class — the higher the fire load and combustibility, the higher the density required by codes (NBR/NFPA). It is the basis of hydraulic design and water reserve. Enter the area and the application rate.
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.