Evaporator Sizing Calculator

Input Parameters

Imperial (°F, BTU, ft)SI (°C, kW, m)

Cooling Load (BTU/hr)

Refrigerant Type

Evaporator Temperature (°F)

Air Entering Temperature (°F)

Air Leaving Temperature (°F)

Airflow (CFM)

Evaporator Area sq ft

Face Area sq ft

Number of Rows

500

Face Velocity FPM

Formula:

LMTD = \frac{\Delta T_1 - \Delta T_2}{\ln(\Delta T_1 / \Delta T_2)}

Calculation:

LMTD = \frac{35.0 - 15.0}{\ln(35.0 / 15.0)}

Result:

23.6 \text{ °F}

Formula:

A = \frac{Q}{U \times LMTD}

Calculation:

A = \frac{36000}{150 \times 23.6}

Result:

10.2 \text{ sq ft}

Formula:

A_{face} = \frac{Q_{air}}{V_{face}}

Calculation:

A_{face} = \frac{1200}{500}

Result:

2.4 \text{ sq ft}