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HEAT GENERATION AND RECOVERY SYSTEMS

Learn how CWU's natural gas boilers heat campus buildings and recover waste heat using a CONDEX system, promoting sustainability and efficiency.

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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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