🌬️ Indirect Evaporative Cooler Sizer (M-Cycle)

Size Maisotsenko Cycle (M-Cycle) dew-point indirect evaporative coolers: sub-wet-bulb cooling, dew-point effectiveness, COP > 25, and zero-humidity added sensible cooling.

⚡ Fortran 90 Engine Double Precision (IEEE 754) ✓ ISO / ASME Validated

Indirect Evaporative Cooler Sizer (M-Cycle)

Heat Exchangers

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📅 Released Jun 2026

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🌬️ Maisotsenko Cycle Multi-Channel Dew-Point Evaporation

Real-time visual simulation: Product dry channel (sensible cooling) and counterflow wet evaporative channels

📝 Configuration & Presets

🏜️ Desert Arid (40°C / 18% RH) 🖥️ Datacenter Free-Cooling 🏢 Commercial Building DOAS 🏭 Industrial Spot Cooling

☀️ Ambient Air Climate State

Dry-Bulb Temp T_db,in [°C]:

Relative Humidity RH [%]:

📐 Airflow & M-Cycle Architecture

Supply Product Airflow [m³/h]:

Working Air Split Fraction [%]:

Dew-Point Effectiveness ε_dp:

Maisotsenko Dew-Point (M-Cycle) Formulation:
• Product Air Outlet: T_out = T_db,in − ε_dp · (T_db,in − T_dp) [°C]
• Wet-Bulb Effectiveness: ε_wb = (T_db,in − T_out) / (T_db,in − T_wb) > 100%
• Sensible Cooling (Zero Humidity Added): Q̇ = ṁ_product · c_p · (T_db,in − T_out) [kW]
• Energy Efficiency Ratio: COP > 25 (90% electricity reduction vs compressor AC).

📊 Dew-Point Cooling Results

📊 Output Summary
💾 Fortran Source

Cooled Product Supply Temperature (T_out)

21.5 °C (Zero Moisture Added)

Wet-Bulb: 23.1 °C | Dew-Point: 18.6 °C | Capacity: 6.9 kW

SUB-WET-BULB DEW-POINT COOLING (M-CYCLE SUCCESS)

Wet-Bulb Effectiveness (ε_wb) 117.3% >100% Sub-wet-bulb M-Cycle

Energy Efficiency Ratio (COP) 21.8 >85% lower energy than DX AC

Sensible Cooling Drop -10.5 °C Inlet = 32 °C

Evaporative Water Demand 10.6 L/h 30% working air fraction

📈 Product Outlet Temp Tout (°C) vs Ambient Humidity RH (%)

📊 Sensible Cooling Capacity Q (kW) vs Supply Airflow (m³/h)

=================================================================
 THERMOFLUIDCALC — M-CYCLE DEW-POINT EVAPORATIVE COOLER REPORT
=================================================================
Case Title                 : Commercial Building Dedicated Outdoor Air Unit (DOAS)
Ambient Air State          : Tdb = 32.0 C, RH = 45.0% (Twb = 23.1 C, Tdp = 18.6 C)
Airflow & M-Cycle Settings : Vdot = 2000 m3/h, Working Fraction = 30.0%, eps_dp = 0.78
-----------------------------------------------------------------
COOLED SUPPLY PRODUCT TEMP : 21.53 deg C (Sub-Wet-Bulb Cooling)
WET-BULB EFFECTIVENESS     : 117.3% (>100% M-Cycle Advantage)
SENSIBLE COOLING CAPACITY  : 6.91 kW
System Energy COP (EER)    : 21.8 (Ultra-High Efficiency)
Evaporative Water Demand   : 10.6 Liters/hour
Operating Regime Status    : SUB-WET-BULB DEW-POINT COOLING (M-CYCLE SUCCESS)
=================================================================

📘 Calculation Methodology & M-Cycle Standards

Maisotsenko Dew-Point Sub-Wet-Bulb Principle

By pre-cooling the working air before it enters the wet channels, the thermodynamic limit shifts from the ambient wet-bulb ($T_{wb}$) all the way to the ambient dew-point temperature ($T_{dp}$), yielding wet-bulb efficiencies exceeding $100\%$.

Sensible Cooling Without Humidity Addition

The product supply air stream never contacts the wet surface directly, delivering crisp, dehumidified-feel sensible cooling without increasing the indoor relative humidity.

Key Engineering Assumptions

Counter-flow / cross-flow M-Cycle perforated dry-to-wet channel plate stack.
Sub-wet-bulb psychrometric path with dew-point effectiveness $\epsilon_{dp} \approx 75 - 88\%$.
Widely used in desert climate HVAC, datacenter free-cooling, and hybrid DOAS rooftop units.

ThermoFluidCalc Engineering Report