E-CodePinch analysis: minimum hot and cold utility — a TI-84 Plus CE program
PINCH is a TI-BASIC program for the TI-84 Plus CE. Heat-exchanger network targeting by the problem table: type the streams' supply and target temperatures and CP, and dTmin — minimum hot and cold utility and the pinch temperature (shifted, hot side and cold side).
What it asks for and what it shows
It asks for 4 values at its prompts. In the example below it shows QH MIN, QC MIN, PINCH*, HOT PIN, COLDPIN.
Example run
One of its oracle test cases: “Smith 4-stream example, dTmin 10”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | {250,200,20,140} |
| Input 2 | {40,80,180,230} |
| Input 3 | {0.15,0.25,0.2,0.3} |
| Input 4 | 10 |
| The screen shows | |
QH MIN= | 7.5 |
QC MIN= | 10 |
PINCH*= | 145 |
HOT PIN= | 150 |
COLDPIN= | 140 |
How it's checked
5 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 29 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Pinch analysis: minimum hot and cold utility” (PINCH).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Newton's law of cooling
- Pin fin with convective tip
- Transient plane wall (first term)
- 2-D steady conduction, plate series
- Stefan melting problem
All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs