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Rule22-19.md

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CHW&CW - Rule 22-19

Schema Version: 0.0.16
Mandatory Rule: True Rule ID: 22-19
Rule Description: The tower shall be controlled to maintain a leaving water temperature, where weather permits.
Rule Assertion: B-RMR = expected value
Appendix G Section: Section 22 CHW&CW Loop
90.1 Section Reference: Section G3.1.3.11 Heat Rejection (System 7, 8, 11, 12 and 13)
Data Lookup: None
Evaluation Context: Building

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, 7b, 8b, 11b, 12b.

Function Call:

  1. get_baseline_system_types()
  2. get_component_by_id()

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, 7b, 8b, 11b, 12b, 13b, i.e. with air-side system served by chiller(s), continue to the next applicability check: 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-7B", "SYS-8B", "SYS-11B", "SYS-12B"]): CHECK_RULE_LOGIC

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

Rule Logic:

  • For each heat rejection device in B_RMR: for tower_b in B_RMR.RulesetModelInstance.heat_rejections:

    • Get condensing loop served by heat rejection device: loop_b = get_component_by_id(tower_b.loop)

      Rule Assertion:

      • Case 1: If condensing loop temperature reset type is constant: if loop_b.cooling_or_condensing_design_and_control.temperature_reset_type == "CONSTANT": PASS

      • Case 2: Else: else: FAIL

Notes:

  1. Updated the Rule ID from 22-20 to 22-19 on 7/26/2022

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