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HEAT GENERATION AND RECOVERY SYSTEMS

HEAT GENERATION AND RECOVERY SYSTEMS. Central Washington University Prepared by: Kelsey Bechtholdt May 2019. How is campus heated?. CWU has four natural gas powered boilers These boilers heat up water to produce steam that gets pumped through campus buildings by forced air heating systems

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HEAT GENERATION AND RECOVERY SYSTEMS

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  1. HEAT GENERATION AND RECOVERY SYSTEMS Central Washington University Prepared by: Kelsey Bechtholdt May 2019

  2. How is campus heated? • CWU has four natural gas powered boilers • These boilers heat up water to produce steam that gets pumped through campus buildings by forced air heating systems • Along with the steam, the boilers produce flue gases that enter the atmosphere through the smokestack • The economizer is used to capture heat from flue gases to preheat incoming boiler feed water, reducing the firing rate of the boiler

  3. Waste heat recovery system • In June of 2015, CWU added a condensing heat exchanger (CONDEX) that captures the waste heat from the boiler’s flue gases and pumps it to Samuelson, Discovery Hall, and the upcoming Health Sciences building • As of now, the heat exchanger can heat the new 261,036 square feet of campus buildings without burning additional fuel, resulting in an 8% efficiency improvement

  4. How does the CONDEX system work? • Flue gases are drawn off of the boiler stacks by fans, which push them through the CONDEX heat exchanger. • The gases then pass through a glycol-filled coil that cools the gas to its condensation point. This captured heat is then transferred to the low temperature heating water loop. • As the boilers load changes, the supply control dampers open and close to capture all available flue gases. • The remaining 90℉ gases leave the heat exchanger and are discharged to the atmosphere by a separate stack. 4. 3. 1. 2.

  5. Why does it matter? • This new innovation allows CWU to: • Prevent burning additional natural gas • Reduce greenhouse gas emissions • Save money • Recover usable water from flue gas condensation • Enhance sustainability on campus

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