# Heat Exchanger Duty Calc — LMTD BTU Thermal Design Tool

> LMTD BTU Thermal Design Tool (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/heat-exchanger-duty-calc/id6761745524 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-04-08
- Data updated: 2026-07-22
- User reviews in markdown: https://appshunter.io/ios/app/heat-exchanger-duty-calc/id6761745524/reviews.md

## What is Heat Exchanger Duty Calc?

Sizing a heat exchanger or verifying duty on an existing unit? Enter hot and cold side temperatures, flow rate, fluid specific heat, and specific gravity. Get instant LMTD, heat duty in BTU/hr, UA product, and thermal effectiveness for both counter-flow and parallel-flow configurations.

WHAT IT CALCULATES:
- Log Mean Temperature Difference (LMTD)
- Heat duty in BTU per hour
- UA product (overall heat transfer coefficient times area)
- Thermal effectiveness (actual vs maximum possible heat transfer)

FLOW CONFIGURATIONS:
- Counter-flow (hot and cold fluids flow in opposite directions)
- Parallel-flow (hot and cold fluids flow in the same direction)

INPUTS:
- Hot side inlet and outlet temperatures
- Cold side inlet and outlet temperatures
- Flow rate (GPM)
- Fluid specific heat (Cp)
- Fluid specific gravity

KEY FEATURES:
- Counter-flow and parallel-flow support
- Instant results as you adjust inputs
- Clean, field-friendly interface
- Works completely offline
- No account or login required

Built for process engineers, mechanical designers, and plant operators who need quick heat exchanger performance calculations during design, commissioning, or troubleshooting.


## Version history (last 3 releases)

### 1.0.3 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.0.2 — 2026-04-13

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-08

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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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 2026-07-22.*