Ultra-Low Temperature Cascade Refrigeration Calculator

Size the intermediate cascade condenser heat exchanger coupling the low-temperature stage (R-23) with the high-temperature stage (R-404A / R-507A).

Low & High Stage Temperatures

Low-Stage Evaporator Temp T_e,low (°C): -80°C (-112°F) vaccine / ULT storage

High-Stage Condenser Temp T_c,high (°C):

Cascade Heat Exchanger Approach ΔT_cas (°C): L-stage Condensing minus H-stage Evap

Low-Stage Cooling Load Q_low (kW):

Low-Stage Refrigerant:

High-Stage Refrigerant:

Cascade Sizing & Thermal Balance

Intermediate Cascade Heat Duty (Q_cas):

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Overall System COP:

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Optimal Cascade Condensing Temp:

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High-Stage Evaporator Temp:

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Low-Stage Compressor Power:

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High-Stage Compressor Power:

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Ultra-Low Temperature Cascade Principles

Achieving temperatures below $-60^circ ext{C}$ to $-85^circ ext{C}$ with a single refrigerant is impossible because fluids with low boiling points (like R-23, NBP $-82^circ ext{C}$) have critical temperatures of only $25.9^circ ext{C}$, preventing ambient water or air condensation.

Thermal Coupling via Cascade Condenser

The evaporator of the high-temperature circuit (R-404A, R-507A, or Propane) acts directly as the condenser for the low-temperature circuit (R-23 or Ethane) inside an ultra-high efficiency plate heat exchanger.

Ultra-Low Temperature Cascade Refrigeration Calculator

Low & High Stage Temperatures

Cascade Sizing & Thermal Balance

Ultra-Low Temperature Cascade Principles

Thermal Coupling via Cascade Condenser

Frequently Asked Questions