❄️ Cooling Coil Psychrometrics

Calculate cooling coil sensible & latent loads, Apparatus Dew Point (ADP), bypass factor (BF), leaving air condition, and condensate drainage rates.

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

Hvac

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📅 Released Jun 2026

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❄️ Psychrometric Cooling & Dehumidification Coil Process Line

Real-time visual psychrometric state points: Entering (1) → Leaving (2) → Apparatus Dew Point (ADP)

📝 Configuration & Presets

🏢 Office Comfort (28°C / 55%) 🌴 Tropical Monsoon (34°C / 80%) 🖥️ Data Center (SHR > 0.95) 🏥 Hospital Operating Suite

🌡️ Entering Air Condition (State 1)

Entering Dry Bulb Temp T_db1 [°C]:

Entering Relative Humidity RH₁ [%]:

Air Volume Flow Rate Q [m³/h]: 1 CFM ≈ 1.699 m³/h

Coil Bypass Factor (BF): 4-row: ~0.15, 6-row: ~0.10, 8-row: ~0.05

❄️ Coil Apparatus Dew Point & Water Loop

Apparatus Dew Point (ADP) [°C]: Effective coil surface temperature

Chilled Water Temperature Rise ΔT_w [°C]: Standard: 6.0 °C (e.g. 6°C Supply / 12°C Return)

Psychrometric Formulations:
• Leaving DB: T_db2 = ADP + BF · (T_db1 − ADP)
• Total Capacity: Q_total = ṁ_a · (h₁ − h₂) [kW]
• Sensible Ratio: SHR = Q_sens / Q_total
• Condensate Rate: ṁ_w = ṁ_a · (w₁ − w₂) × 3600 [L/h]

📊 Coil Performance Results

📊 Output Summary
💾 Fortran Source

Total Cooling Coil Load

Q_total = 76.50 kW (21.8 TR)

Leaving Air State: 11.3 °C DB @ 95.1 % RH

SHR = 0.559

Sensible Capacity (Q_s) 42.73 kW 55.9 % of Total

Latent Dehumidification (Q_l) 33.77 kW 44.1 % Latent

Condensate Extraction Rate 46.73 L/h Δw = 5.09 g/kg

Chilled Water Flow (ΔT=6°C) 10.99 m³/h 48.4 GPM

📈 Total Cooling Capacity (kW) vs Air Flow Q

📉 Condensate Extraction Rate (L/h) vs ADP

=================================================================
 THERMOFLUIDCALC — COOLING COIL PSYCHROMETRIC REPORT
=================================================================
Case Title                 : Commercial Office Standard Summer Comfort AHU
Entering Air State (1)     : 28.0 °C DB, 55.0 % RH (h=61.43 kJ/kg, w=13.03 g/kg)
Apparatus Dew Point (ADP)  : 9.50 °C
Coil Bypass Factor (BF)    : 0.100 (Contact Factor = 0.900)
Air Volume Flow Rate       : 8,000.0 m3/h (4,709 CFM)
-----------------------------------------------------------------
Leaving Air State (2)      : 11.3 °C DB, 95.1 % RH (h=31.44 kJ/kg, w=7.94 g/kg)
TOTAL COOLING CAPACITY     : 76.50 kW (21.75 TR, 261032 BTU/h)
Sensible Capacity (Qs)     : 42.73 kW (55.9 %)
Latent Capacity (Ql)       : 33.77 kW (44.1 %)
Sensible Heat Ratio (SHR)  : 0.5586
Condensate Moisture Rate   : 46.73 L/h (46.73 kg/h)
Chilled Water Flow (dT=6°C): 10.99 m3/h (48.4 GPM)
=================================================================

📘 Calculation Methodology & ASHRAE Standards

Apparatus Dew Point & Bypass Factor

The portion of air that passes untouched through fin spaces is represented by the Bypass Factor $BF$. The condition curve connects state 1 directly toward $ADP$:

                    Tdb2 = ADP + BF · (Tdb1 − ADP)
                

Sensible Heat Ratio & Dehumidification

When the coil surface temperature $ADP < T_{dew1}$, simultaneous cooling and moisture condensation occur. Deeper 6–8 row coils achieve $BF \le 0.08$ for deep moisture removal.

Key Engineering Assumptions

Standard atmospheric pressure $P = 101.325\,\text{kPa}$.
Ideal gas mixture thermodynamics for dry air and water vapor.
Chilled water specific heat $c_p = 4.186\,\text{kJ/(kg·K)}$.

ThermoFluidCalc Engineering Report