# VerMech — Mechanical Engineer — HVAC · Fluids · Machine Design

> HVAC · Fluids · Machine Design (iPhone/iPad app by Jittapol Prukpatarakul.)

- Source: https://appshunter.io/ios/app/vermech-mechanical-engineer/id6775213039 (this page in markdown: same URL + `.md`)
- Developer: [Jittapol Prukpatarakul](https://appshunter.io/developer/1876801870)
- Category: Utilities, Education
- Price: $49.99
- Age rating: 4+
- Requires: iOS 15.1 · 38 MB
- Languages: American English
- Released: 2026-06-10
- Data updated: 2026-08-26
- User reviews in markdown: https://appshunter.io/ios/app/vermech-mechanical-engineer/id6775213039/reviews.md

## What is VerMech?

VerMech is a professional offline-first mobile toolkit for mechanical engineers, students, and consultants — HVAC, thermo, fluids, heat transfer, machine design, refrigeration, vibration, IC engines, materials, and dynamics in one app.

HVAC DESIGN
- Cooling and heating load (CLTD, transmission, ventilation)
- Outdoor-air requirement per occupant and per area
- Duct sizing, fan power, psychrometrics (dewpoint, wet-bulb)

THERMODYNAMICS
- Ideal-gas state equation (PV = nRT) for the four unknowns
- Rankine, Brayton, Otto, Diesel cycle efficiency
- Vapor-compression refrigeration cycle COP and entropy change

FLUID MECHANICS
- Reynolds number, Moody-Colebrook friction factor
- Darcy-Weisbach and Hazen-Williams pipe head loss
- Open-channel flow — Manning's equation, Froude regime

HEAT TRANSFER
- Conduction — Fourier's law, multi-layer resistance
- Convection — Dittus-Boelter, natural convection (Rayleigh)
- Radiation — Stefan-Boltzmann, view factor
- Heat-exchanger sizing — LMTD and effectiveness-NTU
- Fin efficiency, insulation thickness sizing

MACHINE DESIGN
- Shaft — bending, torsion, DE-Goodman combined stress
- Bolt — proof load, preload, torque-tension
- Gear — module, pitch, bending stress capacity

REFRIGERATION AND AC
- Vapor-compression cycle — COP, refrigerant effect
- Compressor power — isentropic, actual, shaft
- Cooling tower — wet-bulb approach, range, makeup
- Chiller efficiency — kW per ton, COP/EER/SEER conversion

VIBRATION
- Natural frequency, damping ratio, log decrement
- Forced vibration — magnification, transmissibility
- ISO 10816 severity bands for rotating machinery
- Rotor balance grade selection (ISO 1940 G-grade)
- Vibration isolation — spring selection

IC ENGINES
- Otto cycle efficiency (ideal + actual with combustion losses)
- Displacement, BMEP and brake power
- BSFC and brake thermal efficiency
- Volumetric efficiency and mean piston speed
- Air-fuel ratio — stoichiometric and excess-air analysis

MATERIALS
- Stress-strain — modulus, yield, ultimate strength
- Fatigue — S-N (Basquin), endurance limit
- Hardness — Brinell, Rockwell, Vickers conversion
- Thermal expansion — linear coefficient, length change
- Creep — Larson-Miller parameter; corrosion rate (mpy, mm/y)

STATICS AND DYNAMICS
- Truss — 2D analysis (Pratt, Howe, Warren)
- Beam — shear and moment diagrams (simply-supported + cantilever)
- Centroid and area moment of inertia (rectangle, circle, I-beam, T-beam)
- Friction — block-on-incline, horizontal-pull (μ_s, μ_k)

REGIONAL STANDARDS
Switch design region in Settings — multiple regional code bases: United States, Europe / International, India, China, Japan and Thailand. Region-aware calculators update their limits and lookup tables to match the selected region's published engineering standards.

WHY VERMECH?
- 100% Offline — no internet, no account, no servers
- Formula library — searchable mechanical engineering equation reference, tap to copy
- Quick access — Continue last calculator + Favorites for one-tap return
- Honest comparison — built-in "Why Not AI?" page with head-to-head scenarios
- Formulas from Shigley, Cengel, Incropera and Beer-Johnston textbooks
- Built-in calculator guides with worked examples
- Multiple languages with native scientific terminology
- Pay once, use forever — no subscriptions

TECHNICAL STANDARDS REFERENCES
- ASHRAE https://www.ashrae.org/technical-resources/standards-and-guidelines · ASME https://www.asme.org/codes-standards · ISO https://www.iso.org
- AGMA https://www.agma.org/standards · ASTM https://www.astm.org · SAE https://www.sae.org

AFFILIATION DISCLAIMER
VerMech is published by AI Visibility Rights and is NOT affiliated with or endorsed by any standards organization, trade body, or government entity.

DISCLAIMER: For reference and educational purposes only. All engineering designs must be verified by a licensed professional engineer.


## Version history (last 1 release)

### 1.0 — 2026-06-10

No release notes.

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All apps by Jittapol Prukpatarakul: https://appshunter.io/developer/1876801870

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*