Calculate airside sensible coil capacity and compare it with an approved design value.
Why it matters: Capacity verification connects airflow and temperature difference to delivered performance while keeping uncertainty visible.
ΣCALCULATE · VERIFY · INTERPRET
Calculated result
Engineering evaluation
Within entered screening criteria
Measured sensible capacity relative to schedule (PC)100 %
Calculated sensible capacity (Ccalc)
216,000 Btu/h
Measured temperature-difference magnitude (ΔT)
20 °F
Signed leaving-minus-entering temperature change (ΔTs)
-20 °F
Signed capacity deviation (δC)
0 %
Engineering interpretation
Calculated sensible capacity magnitude is 216000 Btu/h, or 100% of the entered scheduled capacity. The signed temperature change indicates cooling. This result excludes latent capacity and is sensitive to airflow, sensor placement, and small temperature differences.
Confirm the approved reference values and test boundary.
Stabilize the system and record calibrated field measurements.
Review calculation assumptions, uncertainty, and supporting evidence before disposition.
Common engineering mistakes
Comparing readings taken at different loads, modes, or reference conditions.
Treating a calculated status as proof of code, contract, or manufacturer compliance.
Technical basis
References and source standards
ASHRAE Handbook—FundamentalsCurrent handbook chapters covering fluid flow, thermodynamics, psychrometrics, measurement, and engineering analysis; the project reviewer must verify the licensed edition used for approval.
ASHRAE Commissioning ResourcesCommissioning-process context for defining test methods, acceptance criteria, evidence, and owner requirements.
These engineering tools are provided for educational, preliminary evaluation, field verification, and commissioning support. Results depend on the accuracy of user-entered information and the assumptions stated for each calculation. Every colored status and comparison is a screening indicator only; project criteria, contract requirements, applicable codes, manufacturer instructions, measurement uncertainty, and authorized engineering judgment govern. The tools do not replace project-specific engineering analysis or the judgment of a licensed professional engineer.
