Calculatornest

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Air Conditioning Load Calculator

Air Conditioning Load Calculator

Estimates sensible & latent cooling loads. Units SI. Defaults are editable.

Design indoor temperature (T_in) °C

Outdoor temperature (T_out) °C

Indoor relative humidity (%)

Outdoor relative humidity (%)

Space & Airflow

Volume of space (m³)

Air changes per hour (ACH) — ventilation + infiltration

Ventilation flow (if known) L/s

Supply air temperature (°C) — for sensible balance

Transmission (U·A)
Enter each surface as Area (m²) and U (W/m²·K). Add multiple by pressing +Add. Use 0 area to ignore.

Internal Gains

People (number)

Sensible per person (W)

Latent per person (W)

Lighting power (W)

Equipment/plug load (W)

Solar through glazing (simplified)

Window area (m²)

Solar heat gain factor (SHGF) W/m² (incident)

Shading factor (0–1)

SHGF depends on orientation/time; user may change it.

August 29, 2025
Refrigeration Cycle COP Calculator

Refrigeration & Heat Pump COP Calculator
Cycle type

Evaporator temperature T_L (°C)

Condenser temperature T_H (°C)

Temperatures converted to Kelvin automatically

August 29, 2025
Thermodynamic Cycle Efficiency Calculator

Thermodynamic Cycle Efficiency Calculator
Cycle type

August 29, 2025
Radiation Heat Transfer Calculator

Radiation Heat Transfer Calculator
Mode

August 29, 2025
Radiation Heat Transfer Calculator

Radiation Heat Transfer Calculator
Mode

August 29, 2025
Conduction Heat Transfer Calculator

Conduction Heat Transfer Calculator
Conduction type

August 29, 2025
Convection Heat Transfer Calculator

Convection Heat Transfer Calculator

Choose flow type, enter geometry & fluid properties. Calculates Re, Pr, Nu, h and Q = h·A·ΔT.
Flow type

Fluid preset

Temperature difference ΔT = |T_surface – T_inf| (K)

Area A (m²)

Fluid properties (SI). Edit if preset = Custom

Density ρ (kg/m³)

Dynamic viscosity μ (Pa·s)

Thermal conductivity k (W/m·K)

Specific heat c_p (J/kg·K)

August 29, 2025
Heat Exchanger — LMTD Design Calculator

Heat Exchanger Design — LMTD Method

Choose input method and enter temperatures. Cp may be entered as kJ/kg·K (typical) or J/kg·K.
Calculation mode

Hot stream (supply)

Hot mass flow ṁ_h (kg/s)

Hot inlet temperature T_hi (°C)

Hot outlet temperature T_ho (°C)

Cold stream (receive)

Cold mass flow ṁ_c (kg/s)

Cold inlet temperature T_ci (°C)

Cold outlet temperature T_co (°C)

Specific heat (Cp)

Typical water Cp ≈ 4.18 kJ/kg·K

Heat duty Q (kW) When using direct Q you still must enter temperatures to compute LMTD.

Hot inlet T_hi (°C)

Hot outlet T_ho (°C)

Cold inlet T_ci (°C)

Cold outlet T_co (°C)

Flow arrangement

Overall heat transfer coefficient U (W/m²·K)

LMTD correction factor F (use 1 for simple exchangers)

August 29, 2025
Pneumatic Cylinder Force Calculator

Pneumatic Cylinder Force Calculator

Enter cylinder geometry, operating pressure and losses. Results: thrust (extend) and pull (retract) forces.

Cylinder type Bore diameter (D) Default unit: mm Unit for diameters

Rod diameter (d) — leave 0 if not known Same unit as bore. For single-acting you can ignore. Operating pressure Pressure unit

Pressure loss (%) — pipe/valve losses Safety factor (apply to available force) Desired output units

August 29, 2025