Validation and Verification for INL Modelica-based TEDS models Via Experimental Results
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
This report provides an overview on the verification and validation (V&V) of the Thermal Energy Distribution System (TEDS) model developed in the Modelica process modeling ecosystem using experimental data. Model development has led to the creation of a dynamic process model of the experimental TEDS facility housed within the Energy Systems Laboratory (ESL) at Idaho National Laboratory (INL). The model was then used during the preconstruction phase of the experimental effort to inform experimental design (e.g., insulation requirements, bypass line placement, expected performance of components) and to test innovative control schemes prior to the initial operation. The TEDS model developed in Modelica includes the primary components of the TEDS experimental unit: a 200kW Chromalox heater; a single-tank packed-bed thermal energy storage system filled with 0.125-inch alumina (Al2O3) beads; an ethylene-glycol-to-Therminol-66 heat exchanger; system piping; five control valves; and all associated temperature, pressure, and volumetric flow sensors. Using the Institute of Electrical and Electronics Engineers (IEEE) V&V methodologies, considered the gold standard in the engineering field, the model was verified using a combination of static analysis, spatial convergence, and regression tests. Then using dynamic time warping (DTW) initial runs to validate and tune the TEDS model versus the experiment were conducted. This tuning method was accomplished using the INL Risk Analysis Virtual ENvironment (RAVEN) software package. Tuning is required to account for physical phenomena that are less understood within the empirical heat transfer correlations. Through the commencement of this work, a systems-level model of TEDS with associated control systems, sensors, piping diameters, and component capabilities has been created. This model was utilized in the pre-experimental phase to inform system design, insulation thicknesses, and potential control schemes to operate the system effectively and safely. Then, initial experimental startup and operational data were used to demonstrate the validation and tuning methodology. This process demonstrates the classical two-step approach of a model informing experimental design followed by the experiment validation and tuning the model.
- Research Organization:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1836100
- Report Number(s):
- INL/EXT-21-64408-Rev000
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of the INL Thermal Energy Distribution System (TEDS) in the Modelica Eco-System for Validation and Verification
Validation and Verification of TEDS Facility HYBRID Modeling
Operation and Control of the INL Thermal Energy Delivery System (TEDS)
Technical Report
·
Fri Jul 31 00:00:00 EDT 2020
·
OSTI ID:1668777
Validation and Verification of TEDS Facility HYBRID Modeling
Technical Report
·
Sat Sep 30 00:00:00 EDT 2023
·
OSTI ID:2299518
Operation and Control of the INL Thermal Energy Delivery System (TEDS)
Conference
·
Tue Jan 22 23:00:00 EST 2019
·
OSTI ID:1498772