公开(公告)号：USRE49883E1

公开(公告)日：2024-03-26

申请号：US17452265

申请日：2021-10-26

Applicant: Watts Regulator Co.

Inventor： Mark Daniels ,  Adrian Voicu

IPC: F24D19/10 ,  F24D3/10 ,  F24D17/00 ,  F24H9/13

CPC classification number: F24D19/1051 ,  F24D3/1091 ,  F24D17/001 ,  F24D17/0031 ,  F24D17/0078 ,  F24H9/136 ,  F24D2220/0207 ,  F24D2220/0228 ,  F24D2220/0235 ,  F24D2220/042 ,  F24D2220/044 ,  F24D2220/06 ,  F24D2240/00

Abstract: A water heater includes a heat exchanger. A controllable three-way proportional valve provides a proportionally controllable flow to the hot water inlet of the heat exchanger and a boiler return water outlet. A mixing tank mixes a cold water and a hot water. The mixing tank provides a time delayed mixed water. A temperature sensor is disposed in or on the mixing tank to measure a temperature of the time delayed mixed water to provide a time delayed mixed water temperature. A feedforward control process running on a processor adjusts a proportional operating position of the controllable three-way proportional valve to regulate a temperature of hot water at the hx domestic hot water outlet based on the temperature of the time delayed mixed water temperature. A method for controlling a hot water temperature of a water heater a water heater using a flowmeter based feedforward control are also described.