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Both temperatures are related to the saturation temperature in the steam drum of a heat recovery steam generator. The approach temperature is the water temperature at the economizer outlet, which in many analyses is assumed to be equal to the saturation temperature for simplicity. The "pinch point temperature difference" is the difference between the saturation temperature and the gas temperature at the economizer inlet.

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Q: What is the difference between pinch point and approach temperature?
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Dash, pinch and speck are nebulous terms. They can be basically whatever you like.


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