NREL/EnergyPlus
Mar 2025 – Oct 2025
8 Months active
Languages Used
C++IDFLatexMarkdownFortranTeXiddLaTeX
Technical Skills
Backend DevelopmentBuilding Systems AnalysisC++C++ DevelopmentClean CodeCode Cleanup
Bereket Nigusse
PROFILE
Bereket Nigusse
Biruk Nigusse contributed to the NREL/EnergyPlus repository by developing and refining core HVAC and energy modeling features, focusing on input handling, simulation accuracy, and code maintainability. He implemented robust input parsing and JSON serialization for coil and heat pump components, enhanced fuel efficiency calculations, and improved error handling to prevent silent failures. Using C++, Fortran, and IDF, Biruk centralized configuration logic, expanded test coverage, and modernized version transition tooling to ensure upgrade safety. His work emphasized clean code practices, targeted refactoring, and comprehensive documentation, resulting in more reliable simulations, reduced technical debt, and streamlined maintenance for building energy analysis workflows.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
147Total
Bugs
25
Commits
147
Features
38
Lines of code
31,921
Activity Months8
Your Network
33 peopleSame Organization
@fsec.ucf.edu2
Work History
October 2025
4 Commits
Oct 1, 2025Monthly summary for 2025-10 focusing on the EnergyPlus repository (NREL/EnergyPlus). The work centered on maintainability improvements and robust error handling, with targeted code cleanup and fixes to ensure reliability and clearer test behavior.
4 Commits
Oct 1, 2025Monthly summary for 2025-10 focusing on the EnergyPlus repository (NREL/EnergyPlus). The work centered on maintainability improvements and robust error handling, with targeted code cleanup and fixes to ensure reliability and clearer test behavior.
October 2025
September 2025
9 Commits • 3 Features
Sep 1, 2025Month: 2025-09 — EnergyPlus development summary focusing on delivering upgrade-safe features, robust fixes, and measurable business value for energy modeling accuracy and stability. Key features delivered: - EnergyPlus Input Version Transition (25.1 -> 25.2): Implemented Fortran file CreateNewIDFUsingRulesV25_2_0.f90 to manage version upgrades, set version variables, and preserve data integrity during input-object upgrades. (Commit bf2e9da386bbbe895336a3e232bb94882f5d5e18) - Unit tests for LEED Summary PV system: Added unit test for PV system setup and total PV capacity with fixture adjustments to improve reliability of renewable energy source testing. (Commits 38ba5f0e43196593851843e57b2ad9ddfe452904; 0a3891c2ada6ff21e7aa3287efecbab9c1f712c6) - Documentation: Energy equation formatting corrections in Engineering Reference to improve readability of equations and variable descriptions. (Commits 2f4eb7e2b04036099c14cb1f038c15a3bb7f57e5; 113d99f9a35d2260e2d390f93bd2eebd426d12ae) Major bugs fixed: - PVWatts inclusion in total capacity reporting: Fixed logic to include PVWatts generators alongside traditional PV in total PV capacity reporting. (Commit f659f7eabac69a489a295fa16085e96de03f7f5b) - PurchasedAirManager default-value validation simplification: Removed redundant validation checks; fields with default values now rely on implicit handling. (Commit f4290c9c3e58b2a3bf88b1ed5387986f70414fb2) - ZoneHVAC sizing object lookup robustness: Separated index assignment from existence check to fix build errors on Ubuntu and macOS. (Commit bad797da4748fb5fb81de55f92ef42dcdfc6f276) - Zone Ideal Loads Hybrid Ventilation output variable registration: Corrected type casting and ensured proper registration to fix compiler errors. (Commit 0e89f84898e615d27553d3f102f6e4a26c565de9) Overall impact and accomplishments: - Increased upgrade reliability and data integrity for EnergyPlus input files, reducing downstream modeling errors during version transitions. - More accurate PV modeling results due to corrected PVWatts reporting, enhancing trust in capacity planning and energy simulations. - Expanded test coverage for PV-related features and renewable energy integration, lowering regression risk and supporting faster iterations. - Improved cross-platform stability and build robustness, decreasing maintenance overhead for Linux/macOS environments. - Clearer technical documentation with improved equation formatting, aiding user comprehension and engineering reference. Technologies and skills demonstrated: - Fortran-based upgrade tooling and version-transition logic; cross-module data integrity handling. - Unit testing practices and test fixture management for renewable energy components. - Cross-platform debugging and build stabilization on Linux/macOS. - Code cleanup and simplification for default-valued fields. - Documentation formatting and LaTeX-quality improvements for engineering references.
September 2025
9 Commits • 3 Features
Sep 1, 2025Month: 2025-09 — EnergyPlus development summary focusing on delivering upgrade-safe features, robust fixes, and measurable business value for energy modeling accuracy and stability. Key features delivered: - EnergyPlus Input Version Transition (25.1 -> 25.2): Implemented Fortran file CreateNewIDFUsingRulesV25_2_0.f90 to manage version upgrades, set version variables, and preserve data integrity during input-object upgrades. (Commit bf2e9da386bbbe895336a3e232bb94882f5d5e18) - Unit tests for LEED Summary PV system: Added unit test for PV system setup and total PV capacity with fixture adjustments to improve reliability of renewable energy source testing. (Commits 38ba5f0e43196593851843e57b2ad9ddfe452904; 0a3891c2ada6ff21e7aa3287efecbab9c1f712c6) - Documentation: Energy equation formatting corrections in Engineering Reference to improve readability of equations and variable descriptions. (Commits 2f4eb7e2b04036099c14cb1f038c15a3bb7f57e5; 113d99f9a35d2260e2d390f93bd2eebd426d12ae) Major bugs fixed: - PVWatts inclusion in total capacity reporting: Fixed logic to include PVWatts generators alongside traditional PV in total PV capacity reporting. (Commit f659f7eabac69a489a295fa16085e96de03f7f5b) - PurchasedAirManager default-value validation simplification: Removed redundant validation checks; fields with default values now rely on implicit handling. (Commit f4290c9c3e58b2a3bf88b1ed5387986f70414fb2) - ZoneHVAC sizing object lookup robustness: Separated index assignment from existence check to fix build errors on Ubuntu and macOS. (Commit bad797da4748fb5fb81de55f92ef42dcdfc6f276) - Zone Ideal Loads Hybrid Ventilation output variable registration: Corrected type casting and ensured proper registration to fix compiler errors. (Commit 0e89f84898e615d27553d3f102f6e4a26c565de9) Overall impact and accomplishments: - Increased upgrade reliability and data integrity for EnergyPlus input files, reducing downstream modeling errors during version transitions. - More accurate PV modeling results due to corrected PVWatts reporting, enhancing trust in capacity planning and energy simulations. - Expanded test coverage for PV-related features and renewable energy integration, lowering regression risk and supporting faster iterations. - Improved cross-platform stability and build robustness, decreasing maintenance overhead for Linux/macOS environments. - Clearer technical documentation with improved equation formatting, aiding user comprehension and engineering reference. Technologies and skills demonstrated: - Fortran-based upgrade tooling and version-transition logic; cross-module data integrity handling. - Unit testing practices and test fixture management for renewable energy components. - Cross-platform debugging and build stabilization on Linux/macOS. - Code cleanup and simplification for default-valued fields. - Documentation formatting and LaTeX-quality improvements for engineering references.
August 2025
1 Commits
Aug 1, 2025In August 2025, the focus was on stabilizing coil simulations within EnergyPlus by correcting the initialization order in CoilCoolingDXCurveFitPerformance. The change ensures correct setup by moving oneTimeAvailSchedSetup to occur after initial variable assignments and before the main SubcoolReheat simulation, reducing initialization-related variability and improving overall model fidelity.
1 Commits
Aug 1, 2025In August 2025, the focus was on stabilizing coil simulations within EnergyPlus by correcting the initialization order in CoilCoolingDXCurveFitPerformance. The change ensures correct setup by moving oneTimeAvailSchedSetup to occur after initial variable assignments and before the main SubcoolReheat simulation, reducing initialization-related variability and improving overall model fidelity.
August 2025
July 2025
20 Commits • 2 Features
Jul 1, 2025During July 2025, delivered and stabilized core EnergyPlus enhancements in NREL/EnergyPlus, focusing on compressor operation reliability, IDD/IDF modernization, and test coverage. Implemented min outdoor-air temperature safeguards for the DX Cooling Coil compressor across operating modes, with tests and initialization adjustments to ensure correct startup behavior. Expanded variable-speed coil support in IDD/IDF, fixing input retrieval across speeds, adding an availability schedule field, and standardizing field names. Introduced IDF generation rule cleanup and a versioning module to ensure compatibility with new IDF formats, including a Transition Rule File; removed obsolete components causing drift. Added latent-load testing for CoilSystemCoolingDX and related cleanup, and improved documentation and formatting for IDD comments, whitespace, and clang-format to reduce parsing issues across the repository.
July 2025
20 Commits • 2 Features
Jul 1, 2025During July 2025, delivered and stabilized core EnergyPlus enhancements in NREL/EnergyPlus, focusing on compressor operation reliability, IDD/IDF modernization, and test coverage. Implemented min outdoor-air temperature safeguards for the DX Cooling Coil compressor across operating modes, with tests and initialization adjustments to ensure correct startup behavior. Expanded variable-speed coil support in IDD/IDF, fixing input retrieval across speeds, adding an availability schedule field, and standardizing field names. Introduced IDF generation rule cleanup and a versioning module to ensure compatibility with new IDF formats, including a Transition Rule File; removed obsolete components causing drift. Added latent-load testing for CoilSystemCoolingDX and related cleanup, and improved documentation and formatting for IDD comments, whitespace, and clang-format to reduce parsing issues across the repository.
June 2025
17 Commits • 5 Features
Jun 1, 2025June 2025 monthly highlights for NREL/EnergyPlus focusing on input handling robustness, test configuration, code quality, and reporting enhancements. Delivered multiple features with tangible improvements to reliability, testing fidelity, and documentation; business value includes more accurate energy reporting, reduced input errors, and faster maintenance.
17 Commits • 5 Features
Jun 1, 2025June 2025 monthly highlights for NREL/EnergyPlus focusing on input handling robustness, test configuration, code quality, and reporting enhancements. Delivered multiple features with tangible improvements to reliability, testing fidelity, and documentation; business value includes more accurate energy reporting, reduced input errors, and faster maintenance.
June 2025
May 2025
29 Commits • 5 Features
May 1, 2025May 2025 — NREL/EnergyPlus: Delivered key features, fixed critical gaps, and expanded test coverage to boost model accuracy and reliability. Highlights include JSON-based input extraction for AirManager, enhanced fuel energy and efficiency inputs, and architectural/design improvements, supported by comprehensive unit tests and cleanup of error handling.
May 2025
29 Commits • 5 Features
May 1, 2025May 2025 — NREL/EnergyPlus: Delivered key features, fixed critical gaps, and expanded test coverage to boost model accuracy and reliability. Highlights include JSON-based input extraction for AirManager, enhanced fuel energy and efficiency inputs, and architectural/design improvements, supported by comprehensive unit tests and cleanup of error handling.
April 2025
31 Commits • 10 Features
Apr 1, 2025April 2025 performance summary for NREL/EnergyPlus: Delivered substantial feature expansion and stability improvements that enhance scheduling fidelity, code quality, and documentation. The work focused on expanding Availability Schedule support across a broad set of DX Coils, improving test coverage and parsing robustness, and documenting changes for maintainers and users. Business value was realized through more accurate energy modeling, reduced misconfiguration risk, and cleaner codebase enabling faster future iterations.
31 Commits • 10 Features
Apr 1, 2025April 2025 performance summary for NREL/EnergyPlus: Delivered substantial feature expansion and stability improvements that enhance scheduling fidelity, code quality, and documentation. The work focused on expanding Availability Schedule support across a broad set of DX Coils, improving test coverage and parsing robustness, and documenting changes for maintainers and users. Business value was realized through more accurate energy modeling, reduced misconfiguration risk, and cleaner codebase enabling faster future iterations.
April 2025
March 2025
36 Commits • 13 Features
Mar 1, 2025Summary for EnergyPlus development, 2025-03 (NREL) focusing on feature delivery, input standardization, and code health across HVAC coil components.
March 2025
36 Commits • 13 Features
Mar 1, 2025Summary for EnergyPlus development, 2025-03 (NREL) focusing on feature delivery, input standardization, and code health across HVAC coil components.
Activity
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Quality Metrics
Correctness91.6%
Maintainability91.2%
Architecture87.8%
Performance84.0%
AI Usage21.2%
Skills & Technologies
Programming Languages
C++FortranIDFLaTeXLatexMarkdownTeXidd
Technical Skills
Backend DevelopmentBuild SystemBuilding SimulationBuilding Systems AnalysisBuilding Systems SimulationC++C++ DevelopmentCFDClean CodeCode CleanupCode CorrectionCode DocumentationCode FormattingCode IntegrationCode Optimization
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