公开(公告)号：US11092354B2

公开(公告)日：2021-08-17

申请号：US16447783

申请日：2019-06-20

Applicant: Johnson Controls Technology Company

Inventor： Rachel A. Glanzer ,  Brennan H. Fentzlaff ,  Kirk H. Drees ,  John M. House ,  Timothy I. Salsbury

IPC: G05B99/00 ,  F24F11/84 ,  F24F13/30 ,  F16K1/52

Abstract: A method for controlling flow in a heating, ventilation, and air conditioning (HVAC) system that imposes an upper limit on the flow of fluid through a heating or cooling coil. Imposing this limit on the flow rate ensures that a temperature change across the coil remains above a minimum threshold and can significantly reduce energy waste. The method includes receiving a first temperature measurement associated with an inlet of the coil, receiving a second temperature measurement associated with an outlet of the coil, and receiving a flow measurement associated with the valve, applying the first temperature measurement, the second temperature measurement, and the flow measurement as input to a model, determining a maximum flow rate that ensures that a difference between the first temperature measurement and the second temperature measurement is above a threshold using the model, and operating the valve in accordance with the maximum flow rate.

公开(公告)号：US11149976B2

公开(公告)日：2021-10-19

申请号：US16447813

申请日：2019-06-20

Applicant: Johnson Controls Technology Company

Inventor： Rachel A. Glanzer ,  Brennan H. Fentzlaff ,  Kirk H. Drees

IPC: F24F11/84 ,  F24F140/20

Abstract: A method for controlling flow in a heating, ventilation, and air conditioning (HVAC) system includes adjusting a setpoint associated with a valve based on a temperature change across a heating or cooling coil to reduce energy waste. The method includes receiving a first temperature measurement associated with an inlet of the coil, receiving a second temperature measurement associated with an outlet of the coil, calculating a difference between the first temperature measurement and the second temperature measurement, determining that the difference between the first temperature measurement and the second temperature measurement is below a threshold, and adjusting a setpoint associated with the valve. Additional control features may be provided to improve system behavior such as a pulse generation feature, a change-limiting feature, and a reevaluation feature.