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Calcimator

Coil Selection Calculator

Calculate sensible, latent, and total cooling capacity of HVAC coils with sensible heat ratio from air-side measurements.

Inputs

CFM
°F

AHRI 210/240: standard 80°F EDB; AHRI 550/590 chilled water coils: 95°F EDB / 75°F EWB

°F

AHRI 210/240: standard LDB 55°F; commercial AHU 52–55°F; low-load/high-SHR applications 58–62°F

°F
°F

Results

Sensible Capacity

54,000 BTU/hr

Total Capacity

107,040 BTU/hr

Latent Capacity53,040 BTU/hr
Sensible Heat Ratio (SHR)0.5
How to Use This Calculator
  1. Enter Airflow, Entering Dry Bulb, and Leaving Dry Bulb.
  2. Set Entering Wet Bulb and Leaving Wet Bulb.
  3. Review Sensible Capacity (BTU/hr) and Total Capacity (BTU/hr).
  4. Use Latent Capacity (BTU/hr) and Sensible Heat Ratio (SHR) to inform your decision.

How the result changes with Entering Dry Bulb

Entering Dry BulbSensible CapacityTotal Capacity
48-15,120 BTU/hr37,920 BTU/hr
6828,080 BTU/hr81,120 BTU/hr
9279,920 BTU/hr132,960 BTU/hr
112123,120 BTU/hr176,160 BTU/hr

What each input means

Airflow
Volume of air flowing across the coil in cubic feet per minute.
Entering Dry Bulb
Dry bulb temperature of air entering the cooling coil. ASHRAE design conditions: AHRI 210/240 standard rating at 80°F EDB / 67°F EWB for residential; AHRI 550/590 at 95°F EDB for chilled water coils.
Leaving Dry Bulb
Dry bulb temperature of air leaving the cooling coil. Standard AHRI conditions: 55°F LDB (leaving dry bulb) for residential split systems; 52–55°F for commercial AHUs. Cold aisle data centers target 65–68°F.
Entering Wet Bulb
Wet bulb temperature of air entering the coil.
Leaving Wet Bulb
Wet bulb temperature of air leaving the coil.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Airflow = 2000, Entering Dry Bulb = 80, Leaving Dry Bulb = 55, Entering Wet Bulb = 67 = 5 input(s) provided
  2. Calculate Sensible Capacity
    Sensible Capacity
    54000 = 54000
  3. Calculate Total Capacity
    Total Capacity
    107040 = 107040
  4. Calculate Latent Capacity
    Latent Capacity
    53040 = 53040
  5. Calculate Sensible Heat Ratio
    Sensible Heat Ratio
    0.504 = 0.504

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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