HVAC

HVAC calculators for heat load, duct sizing, refrigerant charge, psychrometrics, ventilation rates, and equipment selection.

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Estimate heating and cooling loads using a simplified Manual J method based on building envelope, windows, and occupancy.

Size round or rectangular ductwork using the equal friction method based on CFM and desired friction rate.

Evaluate refrigerant charge status using subcooling and superheat measurements for TXV and piston metering devices.

Calculate wet bulb temperature, dew point, humidity ratio, enthalpy, and specific volume from dry bulb and relative humidity.

Calculate required outdoor air ventilation rates per ASHRAE Standard 62.1 based on occupancy and space type.

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

Size heating boilers based on building heat loss, domestic hot water load, pickup factor, efficiency, and altitude derating.

Calculate total static pressure loss through ductwork including straight runs, fittings, and equipment for blower selection.

Size chiller systems based on water flow rate, temperature differential, diversity factor, and efficiency metrics.

Calculate building air balance, pressurization status, and required adjustments from supply, return, exhaust, and outside air flows.

Estimate energy and cost savings from an HVAC economizer by comparing mechanical cooling hours to free-cooling hours.

Size ductless mini-split systems based on room dimensions, insulation quality, windows, and climate zone.

Design hydronic radiant floor heating systems including tube length, flow rate, pump head, and boiler sizing.

Size heat recovery ventilators based on building volume, air change requirements, and climate conditions.

Calculate humidification requirements including moisture load, steam capacity, water consumption, and energy cost.