## The CBECC-Res and CSE Software Packages

Annual building loads used in the annual TDV calculation in CBECC-Res are simulated using the underlying California Simulation Engine (CSE). CSE models the thermal and electrical interactions within a building. CBECC-Res generates CSE input files based on the Title 24 rulesets. Separate CSE inputs files are created to simulate the standard design, proposed design, reference design, etc. CBECC-Res then processes the CSE simulation results to determine the Efficiency and Final EDR values as described in the previous section.

While the capability of CBECC-Res is intentionally constrained by ruleset definitions, CSE has much greater flexibility to simulate a wide range of building components. CSE has the unique capability to define dynamic battery system control strategy using its built-in expression language. CSE predicts the building load and PV generation and operates the battery according to expressions pre-defined by CBECC-Res rules.