Transcription of CHAPTER Utilities and Energy Efficient Design 3
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CHAPTER Utilities and Energy Efficient Design 3
CHAPTER3 Utilities and Energy Efficient DesignKEY LEARNING OBJECTIVES How processes are heated and cooled The systems used for delivering steam, cooling water, and other site Utilities Methods used for recovering process waste heat How to use the pinch Design method to optimize process heat recovery How to Design a heat-exchanger network How Energy is managed in batch few chemical processes are carried out entirely at ambient temperature. Most require processstreams to be heated or cooled to reach the desired operation temperature, to add or remove heatsof reaction, mixing, adsorption, etc., to sterilize feed streams, or to cause vaporization or condensa-tion. Gas and liquid streams are usually heated or cooled by indirect heat exchange with anotherfluid: either another process stream or a utility stream such as steam, hot oil, cooling water, orrefrigerant.
The consumption of energy is a significant cost in many processes. Energy costs can be reduced by recovering waste heat from hot process streams and by making use of the fuel value of waste streams. Section 3.4 discusses how to evaluate waste stream combustion as a source of process heat. Section 3.3 introduces other heat recovery approaches.
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