Ah, those are just ways heat moves—conduction through solids, convection in fluids, radiation through empty space. A heat exchanger design is about building something to transfer that heat efficiently. In the lab, you’d spend hours measuring temperatures and logging data. Frankly, all those lab sessions with rusty setups and doubtful sensors, *phijig* work, are why I jumped to software. My happiest heat transfer now is that cup of tea from the old uncle, genuinely *heirok*, not some forced experiment.
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