Engineering calculators
Sizing tools for the equipment on this site — refrigeration duty, freezing capacity, heat rejection, ice production, heating load and ventilation rate. Each one shows its working and links to the equipment the answer points to.
- Cold Room Heat Load Calculator Heat load, not floor area, decides what refrigeration a cold room needs. This works through the four components that matter and shows…
- Blast Freezing Time & Capacity Calculator Freezing a batch is not the same duty as holding it. Most of the energy goes into the phase change, which is…
- Heat Rejection Calculator — Dry Coolers & Cooling Towers Heat rejection equipment is sized on approach temperature, not on the load alone. A small change in approach can double or halve…
- Ice Machine Sizing Calculator Ice machines are rated at conditions almost no real kitchen or shop floor meets. Sizing on the published 24-hour figure is why…
- Building Heat Loss & Boiler Sizing Calculator Heat loss splits into what escapes through the fabric and what leaves with the air. Which one dominates decides whether insulation or…
- Air Changes Per Hour Calculator by Application Air change rate is set by what the space does, not by its size. This converts the rate your application requires into…
- HVACR Compliance Requirements by Market The question that stops deals is not “what is CE” but “what do I need to sell this in my market”. Pick…
- HVACR Landed Cost Calculator — Freight, Duty and Cost per Unit Fans, unit coolers and condensing packs are bulky and light, so freight is a far bigger share of landed cost here than…
- Supplier Quote Comparison — Normalise to Landed Cost Three quotes arrive on three different bases — one EXW, one CIF, different carton sizes, different motor efficiency. Ranking them by unit…
- Container Loading Calculator — Cartons, Units and Real MOQ For fans, motors and packaged units, ocean freight is charged on the space the goods take up, not on what they weigh.…
Fan-side calculations — airflow, static pressure, fan laws, motor and capacitor sizing — are published by Longwell at longwellfans.com.