HWReset
Brief Description
Hot water supply water temperature reset
Detailed Description
Hot-water systems with a design capacity exceeding 300,000 btu/h supplying heated water to comfort conditioning systems shall include controls that automatically reset supply water temperatures by representative building loads (including return water temperature) or by outdoor air temperature. where ddc is used to control valves, the set point shall be reset based on valve positions until one valve is nearly wide open or setpoint limits of the system equipment or application have been reached. (case study)
Index Description
Section 6.5.4.4 in 90.1-2016
Datapoints Description
T_oa_db: OA dry-bulb temperature
T_oa_max: OA dry-bulb upper threshold
T_oa_min: OA dry-bulb lower threshold
T_hw: Hot water temp observed from the system node
m_hw: Hot water flow rate
T_hw_max_set: Hot water maximum temp setpoint
T_hw_min_set: Hot water minimum temp setpoint
Assertions Description
When m_hw > 0, T_hw <= T_hw_max_set and T_hw >= T_hw_min_set; When m_hw < 0, always pass
Type Verification Description
Rule-based
Assertions Type
Pass