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.
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Subcooling degree
Subcooling is the mirror image of superheat, but on the high-pressure side: at the condenser outlet the refrigerant has already condensed all of its vapor and keeps rejecting heat, ending up a few degrees colder than its saturation temperature. ΔT = T_condensing(saturation) − T_liquid. Its importance has two faces. First, process safety: it guarantees that pure liquid, free of vapor bubbles, reaches the expansion valve. If vapor (known as flash gas) enters the valve, it 'chokes' — its capacity collapses, since the valve was designed to meter liquid, not gas. Second, capacity gain: every degree of subcooling raises the refrigerating effect (the liquid enters the evaporator colder and absorbs more heat before it boils off), improving the COP for free — which is why many systems use dedicated subcoolers or liquid-suction heat exchangers. Healthy subcooling typically runs 4–8 °C. Together with superheat, it forms the pair of readings that diagnoses the 'health' and the refrigerant charge of a system: both low may point to an undercharge; abnormal patterns point to restrictions, a badly adjusted valve or a dirty condenser. Enter the saturated condensing temperature and the liquid temperature.
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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.
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.
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