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Rule22-37.md

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Chiller - Rule 22-37

Rule ID: 22-37
Primary Rule: False
Rule Description: Baseline systems served by purchased chilled water loop shall be modeled with a distribution pump with a variable speed drive. Rule Assertion: B-RMD = expected value
Appendix G Section: Section 22 Chiller
Appendix G Section Reference: G3.1.3.10
Schema Version: 0.0.25

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

  1. Check for purchased chilled water in Baseline

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

  1. check_purchased_chw_hhw()

Applicability Checks:

  • Check if B-RMI is modeled with purchased chilled water or purchased hot water/steam: purchased_chw_hhw_status_dict = check_purchased_chw_hhw(B_RMI)

    • If B-RMI is modeled with purchased cooling, rule is applicable, continue to rule logic: if purchased_chw_hhw_status_dict["PURCHASED_COOLING"]: CHECK_RULE_LOGIC

    • Else, rule not applicable: else: RULE_NOT_APPLICABLE

Rule Logic:

Rule Assertion:

  • Case 1: UNDETERMINED and raise_message "B-RMI IS MODELED WITH PURCHASED COOLING. VERIFY PURCHASED CHILLED WATER IS MODELED WITH A DISTRIBUTION PUMP WITH A VARIABLE SPEED DRIVE."

Notes:

  1. Applicability check - Rule Test group decided on 3/16/2023 that using the check_purchased_chw_hhw function for applicability for non-primary rules was the preferred method vs checking for specific baseline HVAC system types. This allows the rule to be flagged even if the baseline HVAC system types aren't modeled 100% correctly.

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