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128
rct229/rulesets/ashrae9012019/section22/section22rule17.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| from rct229.rule_engine.partial_rule_definition import PartialRuleDefinition | ||
| from rct229.rule_engine.rule_list_indexed_base import RuleDefinitionListIndexedBase | ||
| from rct229.rule_engine.user_baseline_proposed_vals import UserBaselineProposedVals | ||
| from rct229.rulesets.ashrae9012019.ruleset_functions.get_heat_rejection_loops_connected_to_baseline_systems import ( | ||
| get_heat_rejection_loops_connected_to_baseline_systems, | ||
| ) | ||
| from rct229.schema.config import ureg | ||
| from rct229.utils.assertions import getattr_ | ||
| from rct229.utils.pint_utils import ZERO, CalcQ | ||
| from rct229.utils.std_comparisons import std_equal | ||
|
|
||
| FAN_SHAFT_POWER_FACTOR = 0.9 | ||
| HEAT_REJ_EFF_LIMIT = 38.2 * ureg("gpm/hp") | ||
|
|
||
|
|
||
| class Section22Rule17(RuleDefinitionListIndexedBase): | ||
| """Rule 17 of ASHRAE 90.1-2019 Appendix G Section 22 (Chilled water loop)""" | ||
|
|
||
| def __init__(self): | ||
| super(Section22Rule17, self).__init__( | ||
| rmrs_used=UserBaselineProposedVals(False, True, False), | ||
| each_rule=Section22Rule17.HeatRejectionRule(), | ||
| index_rmr="baseline", | ||
| id="22-17", | ||
| description="The baseline heat rejection device shall have an efficiency of 38.2 gpm/hp.", | ||
| ruleset_section_title="HVAC - Chiller", | ||
| standard_section="Section 22 CHW&CW Loop", | ||
| is_primary_rule=False, | ||
| rmr_context="ruleset_model_descriptions/0", | ||
| list_path="$.heat_rejections[*]", | ||
| ) | ||
|
|
||
| def create_data(self, context, data): | ||
| rmd_b = context.baseline | ||
| heat_rejection_loop_ids_b = ( | ||
| get_heat_rejection_loops_connected_to_baseline_systems(rmd_b) | ||
| ) | ||
|
|
||
| return {"heat_rejection_loop_ids_b": heat_rejection_loop_ids_b} | ||
|
|
||
| class HeatRejectionRule(PartialRuleDefinition): | ||
| def __init__(self): | ||
| super(Section22Rule17.HeatRejectionRule, self).__init__( | ||
| rmrs_used=UserBaselineProposedVals(False, True, False), | ||
| required_fields={ | ||
| "$": ["rated_water_flowrate"], | ||
| }, | ||
| ) | ||
|
|
||
| def is_applicable(self, context, data=None): | ||
| heat_rejection_b = context.baseline | ||
| heat_rejection_loop_ids_b = data["heat_rejection_loop_ids_b"] | ||
| heat_rejection_loop_b = getattr_(heat_rejection_b, "loop", "loop") | ||
|
|
||
| return heat_rejection_loop_b in heat_rejection_loop_ids_b | ||
|
|
||
| def get_calc_vals(self, context, data=None): | ||
| heat_rejection_b = context.baseline | ||
|
|
||
| fan_shaft_power_b = ( | ||
| heat_rejection_b["fan_shaft_power"] | ||
| if heat_rejection_b.get("fan_shaft_power") | ||
| else ( | ||
| getattr_( | ||
| heat_rejection_b, "heat_rejection", "fan_motor_nameplate_power" | ||
| ) | ||
| * FAN_SHAFT_POWER_FACTOR | ||
| * getattr_( | ||
| heat_rejection_b, "heat_rejection", "fan_motor_efficiency" | ||
| ) | ||
| ) | ||
| ) | ||
|
|
||
| rated_water_flowrate_b = heat_rejection_b["rated_water_flowrate"] | ||
| heat_rejection_efficiency_b = ( | ||
| 0.0 | ||
| if fan_shaft_power_b == ZERO.POWER | ||
| else rated_water_flowrate_b / fan_shaft_power_b | ||
| ) | ||
|
|
||
| return { | ||
| "fan_shaft_power_b": CalcQ("electric_power", fan_shaft_power_b), | ||
| "rated_water_flowrate_b": CalcQ( | ||
| "volumetric_flow_rate", rated_water_flowrate_b | ||
| ), | ||
| "heat_rejection_efficiency_b": heat_rejection_efficiency_b, | ||
| } | ||
|
|
||
| def get_manual_check_required_msg(self, context, calc_vals=None, data=None): | ||
| heat_rejection_b = context.baseline | ||
|
|
||
| additional_note_for_no_shaft_power_b = ( | ||
| "" | ||
| if heat_rejection_b.get("fan_shaft_power") | ||
| else ( | ||
| f"*Note: The fan shaft power for {heat_rejection_b['id']} was not given. For this evaluation, the fan shaft power was calculated using a rule of thumb " | ||
| f"where fan_shaft_power = fan_motor_nameplate_power * {FAN_SHAFT_POWER_FACTOR} * fan_motor_efficiency." | ||
| ) | ||
| ) | ||
| heat_rejection_efficiency_b = calc_vals["heat_rejection_efficiency_b"] | ||
| heat_rejection_efficiency_in_gpm_per_hp_b = round( | ||
| heat_rejection_efficiency_b.to(ureg("gpm/hp")).magnitude, 1 | ||
| ) | ||
|
|
||
| if heat_rejection_efficiency_b > HEAT_REJ_EFF_LIMIT: | ||
| UNDETERMINED_MSG = ( | ||
| f"The project includes a cooling tower. We calculated the cooling tower efficiency to be {heat_rejection_efficiency_in_gpm_per_hp_b}, " | ||
| f"which is greater than the required efficiency of 38.2 gpm/hp, " | ||
| f"resulting in a more stringent baseline. However, it was not possible to verify that the modeling inputs correspond to the rating conditions in Table 6.8.1-7. " | ||
| f"{additional_note_for_no_shaft_power_b}" | ||
| ) | ||
| elif std_equal(HEAT_REJ_EFF_LIMIT, heat_rejection_efficiency_b): | ||
| UNDETERMINED_MSG = ( | ||
| f"The project includes a cooling tower. We calculated the cooling tower efficiency to be correct at 38.2 gpm/hp. " | ||
| f"However, it was not possible to verify that the modeling inputs correspond to the rating conditions in Table 6.8.1-7. " | ||
| f"{additional_note_for_no_shaft_power_b}" | ||
| ) | ||
| else: | ||
| UNDETERMINED_MSG = ( | ||
| f"The project includes a cooling tower. We calculated the cooling tower efficiency to be {heat_rejection_efficiency_in_gpm_per_hp_b}, " | ||
| f"which is less than the required efficiency of 38.2 gpm / hp. However, it was not possible to verify that the modeling inputs correspond to the rating conditions in Table 6.8.1-7. " | ||
| f"Please review the efficiency and ensure that it is correct at the rating conditions as specified in the Table 6.8.1-7. {additional_note_for_no_shaft_power_b}" | ||
| ) | ||
|
|
||
| return UNDETERMINED_MSG | ||
|
|
||
| def rule_check(self, context, calc_vals=None, data=None): | ||
| return True |