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Rule22-2.md

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CHW&CW - Rule 22-2

Rule ID: 22-2
Rule Description: Baseline chilled water design return temperature shall be modeled at 56F.
Rule Assertion: B-RMR = expected value
Appendix G Section: Section 22 CHW&CW Loop
Appendix G Section Reference: Section G3.1.3.8 Chilled-water design supply temperature (System 7, 8, 11, 12 and 13)

Applicability: All required data elements exist for B_RMR
Applicability Checks:

  1. B-RMR is modeled with at least one air-side system that is Type-7, 8, 11.1, 11.2, 12, 13, 1a, 3a, 7a, 8a, 11.1a, 11.2a, 12a, 13a, 7b, 8b, 11b, 12b, 1c, 3c, 7c, 11c.

Manual Check: None
Evaluation Context: Building
Data Lookup: None
Function Call:

  1. get_baseline_system_types()
  2. find_all()

Applicability Checks:

  • Get B-RMR system types: baseline_hvac_system_dict = get_baseline_system_types(B-RMR)

    • Check if B-RMR is modeled with at least one air-side system that is Type-7, 8, 11.1, 11.2, 12, 13, 1a, 3a, 7a, 8a, 11.1a, 11.2a, 12a, 13a, 7b, 8b, 11b, 12b, 13b, 1c, 3c, 7c, 11c, 13c, i.e. with air-side system served by chilled water, continue to rule logic: if any(sys_type in baseline_hvac_system_dict.keys() for sys_type in ["SYS-7", "SYS-8", "SYS-11.1", "SYS-11.2", "SYS-12", "SYS-13", "SYS-1A", "SYS-3A", "SYS-7A", "SYS-8A", "SYS-11.1A", "SYS-11.2A", "SYS-12A", "SYS-13A", "SYS-7B", "SYS-8B", "SYS-11B", "SYS-12B", "SYS-1C", "SYS-3C", "SYS-7C", "SYS-11C"]): CHECK_RULE_LOGIC

    • Else, rule is not applicable to B-RMR: else: RULE_NOT_APPLICABLE

Rule Logic:

  • For each boiler in B_RMI, save boiler to loop boiler dictionary: loop_boiler_dict = find_all(B-RMD)

  • For each fluid loop in B_RMR: for fluid_loop_b in B_RMR.ASHRAE229.fluid_loops:

    • Check if fluid loop is connected to chiller(s): if fluid_loop_b.id in loop_chiller_dict.keys()

      Rule Assertion - Component:

      • Case 1: For baseline primary chilled water loop, if design return temperature is 56F: if fluid_loop_b.cooling_or_condensing_design_and_control.design_return_temperature == 56: PASS

      • Case 2: Else: else: FAIL

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