Dec 4, 2025 · A quick HVAC field reference with formulas for CFM, BTU, Cv, GPM, ΔT, superheat, and subcooling. Use these calculations to verify system capacity, airflow, valve sizing, and heat transfer …

HVAC FORMULAS ... Approximate Energy Content of Fuels cu ft natural gas= 1,000 BTU/hr cord of wood= 30,000,000 BTU/hr ... Compiled by J.R. Kok for Lewis-Clark State College and ICTE (May 2019)

Arithmetic Mean Temperature Difference in Heat Exchangers - AMTD - and Logarithmic Mean Temperature Difference - LMTD - formulas with examples - Online Mean Temperature Calculator.

Download Our Free HVAC Formulas Computrols believes that our customers should have the ability to operate their own HVAC system and building automation controls.

KN = 1.0 for most HVAC Applications = Capacity Correction Factor Due to the Degree of Superheat KSH = 1.0 for Saturated Steam = Compressibility Factor Z = 1.0 If Value is Unknown = Relieving …

Comprehensive guide to essential HVAC design equations covering air, fan, pump, and hydronic system calculations. Reference standards from SMACNA, ASHRAE, and Carrier for professional …

The basic purpose of an HVAC system is to provide interior thermal conditions that a majority of occupants will find acceptable. This simply requires that the air be moved at an adequate velocity.

HVAC Typical Rules of Thumb. (Note: The following numbers are rough estimation numbers. Each application is unique and these numbers do not represent specific application) Packaged AC Unit 1 …

HVAC Equations BTU/HR = 1.08 * CFM * ΔT BTU/HR = 4.5 * CFM * ΔH BTU/HR = 0.69 * CFM * Δgr GPM = BTU/HR (Airside) / (water ΔT x 500) ACH = (CFM * 60) / Volume COP = BTU Output / BTU …

COMMON HVAC FORMULAS AIR SYSTEM Sensible = 1.08 x CFM x ∆T Latent = 4840 x CFM x ∆H