HVAC & Cleanroom Engineering Calculators
Screening tools and preliminary sizing engines for industrial HVAC systems, pharma cleanrooms, hospital modular operation theatres (NABH), hydronic chilled water distribution, ductwork aerodynamics, psychrometrics, cooling towers, staircase smoke pressurization, air showers, and chiller lifecycle energy economics.
Preliminary HVAC Cooling Load & Tonnage Screening Estimator
Estimates sensible and latent cooling loads, decoupled base and design BTU/h, required commercial tonnage (TR), and circulating airflow (CFM).
Cleanroom Airflow Rate (ACPH) & Modular HEPA Sizing
Calculates total circulating airflow for ISO Class 5–8 cleanrooms and hospital OTs (NABH). Sizes modular H14 HEPA units using configurable manufacturer airflow ratings.
Equal Friction Duct Sizing & Aspect Ratio Checking Engine
Determines circular equivalent diameter, iteratively solves Huebscher’s equation for rectangular width given restricted ceiling height, and checks aspect ratio (AR ≤ 4:1).
Chilled Water Pipe Hydronic Sizing & Hazen-Williams Head Loss
Calculates chilled water GPM from chiller tonnage. Selects Schedule 40 NB steel pipe enforcing dual screening criteria (velocity ≤ 8.5 FPS and head loss ≤ 4.0 ft/100ft).
AHU Fan External Static Pressure (ESP) Screening Estimator
Estimates required fan total static head in Pascals, mmWG, and in.wg by aggregating straight duct friction, dynamic fitting allowances, cooling coils, filters, and diffusers.
Psychrometric Mixed Air & Coil Sensible Heat Ratio (SHR)
Determines mixed air dry-bulb and humidity ratio, total cooling coil tonnage (TR / kW), Sensible Heat Ratio, and hourly moisture condensate drain flow.
Evaporative Cooling Tower Water Loss & Makeup Sizing
Calculates condenser water circulating flow (GPM/m³h), thermal range, approach, evaporation rate, drift loss, blowdown, and daily makeup water (kL/day).
Staircase & Lift Well Pressurization Fan Sizing
Sizes smoke containment pressurization fans (CFM / CMH) based on closed door crack leakage and open door egress velocity. Verifies handle force (≤ 100 N).
Cleanroom Air Shower & Dynamic Pass Box Sizing
Calculates high-velocity nozzle airflow (CFM/CMH), exit scrubbing velocity (≥ 20 m/s), chamber air change sweeps per cycle, and blower motor rating.
Chiller Plant Lifecycle Operating Cost & Payback
Evaluates annual kWh savings, power bill reductions (₹), simple capital payback, and 10-year net financial returns using AHRI 550/590 4-bin part load profiles.
These calculations provide preliminary engineering screening and feasibility sizing. Final procurement, structural duct reinforcement, hydronic balancing, and cleanroom validation must be verified by a licensed Chartered Engineer or certified MEP consultant.