Cooling Coil Calculator

Cooling coil capacity, outlet air conditions and dehumidification performance analysis.

What is the Cooling Coil Calculator?

The cooling coil calculator analyzes the thermodynamic performance of cooling coils in air handling units (AHU). From the differences in dry-bulb temperature, relative humidity, wet-bulb, absolute humidity and dew point between inlet and outlet air, it calculates total cooling capacity, sensible and latent heat loads, condensate flow rate and the sensible heat ratio (SHR).

Calculations use Q_s = ṁ × c_p × (T_in − T_out) for sensible heat and Q_l = ṁ × h_fg × (W_in − W_out) for latent heat. Total capacity is verified through enthalpy difference Q_t = ṁ × (h_in − h_out). Condensation percentage, bypass factor and apparatus dew point (ADP) determine the coil selection class. When cooled below the dew point, the process line follows the saturation curve on the psychrometric chart.

SHR is critical in coil selection: high SHR (>0.85) means sensible cooling dominates, low SHR (<0.65) means latent load dominates and dehumidification plays a major role. In data center, clean room and lithium-ion dry room applications, condensation behavior directly drives design decisions.

NKT engineering uses this tool for AHU coil capacity verification, retrofit feasibility and energy analysis. For low dew point processes (e.g. lithium-ion dry rooms, freeze-dryer storage, optics manufacturing) where single-stage cooling cannot reach the target, adding a silica-gel rotor desiccant dehumidification stage downstream is recommended.

Applications

• AHU cooling coil sizing
• Data center precision cooling
• Lithium-ion dry room pre-cooling
• Clean room and pharmaceutical HVAC
• Process cooling systems
• Data center energy analysis
• Retrofit capacity verification
• Freeze-dryer air conditioning

Articles related to this calculator

In-depth content to support your engineering decision after completing the calculation.

Technical Article

How to Read a Psychrometric Chart for Humidification Systems

A practical reading guide to interpret the psychrometric chart on the field: axes, locating an air state, how humidification processes look on the chart, and reading capacity off the chart.

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Technical Article

Humidity Control in Static and Dynamic Cold Storage

The use of dehumidifiers in static and dynamic storage systems plays a critical role in preserving the integrity and longevity of stored items.

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Technical Article

How to Select an Industrial Dehumidifier: Engineering Criteria

Selecting an industrial dehumidifier is a multi-variable engineering decision. This guide covers the key criteria — target RH and dew point, technology, regeneration energy, housing and automation.

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Technical terms used in this tool

Access concise ASHRAE-referenced definitions of technical concepts you encounter in the calculation.

Frequently Asked Questions

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