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

temperature_air_outdoor: Outdoor air temperature

temperature_air_outdoor_max: Outdoor air temperature upper threshold

temperature_air_outdoor_min: Outdoor air temperature lower threshold

temperature_water_hot: Hot water temperature

flow_mass_water_hot: Hot water mass flow rate

temperature_water_hot_setpoint_max: Hot water maximum temperature setpoint

temperature_water_hot_setpoint_min: Hot water minimum temperature setpoint

Assertions Description

When flow_mass_water_hot > 0, temperature_water_hot <= temperature_water_hot_setpoint_max and temperature_water_hot >= temperature_water_hot_setpoint_min; When flow_mass_water_hot < 0, always pass

Type Verification Description

Rule-based

Assertions Type

Pass