Evaluating the Impact of Off-Design CHP Performance on the Optimal Sizing and Dispatch on Hybrid Renewable-CHP Distributed Energy Resources

Hampel, Christopher A.; Becker, William; Olis, Dan; Braun, Robert J.

doi:10.1016/j.enconman.2024.118275

Evaluating the Impact of Off-Design CHP Performance on the Optimal Sizing and Dispatch on Hybrid Renewable-CHP Distributed Energy Resources

Journal Article · 23 March 2024 · Energy Conversion and Management

DOI:https://doi.org/10.1016/j.enconman.2024.118275· OSTI ID:2336790

Hampel, Christopher A.; ; Olis, Dan; Braun, Robert J.

The maturation of distributed energy resources (DER) has prompted the exploration of their deployment in commercial building applications due to their potential to supply energy at lower costs and emissions rates compared to centralized generation. While several software tools exist for evaluating the techno-economic potential of integrated renewable energy and combined heat and power (CHP) systems for distributed generation applications, many suffer from poor accuracy in capturing off-design (part load and changes in ambient air temperature and pressure) performance characteristics of microturbines, combustion turbines, or internal combustion engines. Thus, this paper presents a methodology for integrating these off-design characteristics in the mixed-integer linear program within REopt, a hybrid DER screening tool. The economic impact of the CHP off-design performance is observed through several application studies of various hybrid system configurations in different climates. Each study indicates how CHP off-design performance influences optimal sizing and dispatch decisions and therefore overall system economic value. We observe through case studies that modeling without the off-design effects, depending on the CHP prime mover and site, can result in Net Present Value predictions of hybrid systems that can be overoptimistic in frequently hot climates (up to 52%), too conservative in frequently cold climates (up to 11%), or unaffected (+/-1%) in temperate climates. Cases also highlight several advantages of hybrid systems relative to non-hybrid systems such as total economic value and the systems' ability to mitigate potentially negative consequences attributed to off-design performance.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Industrial Efficiency & Decarbonization Office (IEDO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Federal Energy Management Program Office

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 2336790

Report Number(s):: NREL/JA-7A40-87759; MainId:88534; UUID:af8f9e79-e77f-4725-8c38-0493adf5bdb4; MainAdminId:72362

Journal Information:: Energy Conversion and Management, Vol. 306

Country of Publication:: United States

Language:: English

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Evaluating the Impact of Off-Design CHP Performance on the Optimal Sizing and Dispatch on Hybrid Renewable-CHP Distributed Energy Resources

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