公开(公告)号：EP3869292A1

公开(公告)日：2021-08-25

申请号：EP21157356.3

申请日：2021-02-16

Applicant: Danfoss A/S

Inventor： KELLY, John ,  CERNEKA, Iztok ,  OSOJNIK, Matjaz

IPC: G05D23/19 ,  F24D19/10 ,  F28F27/00

Abstract: The invention relates to a control system (12) for controlling a control valve (16) of a hydrodynamic system (10) using an actuator (14), the hydrodynamic system (10) comprising a heat exchanger (24) with a water inlet (18), a water outlet (20), an air inlet (26), and an air outlet (28), the control system (12) comprising a water inlet temperature sensor (30) that is configured to determine a water inlet temperature value, a water outlet temperature sensor (32) that is configured to determine a water outlet temperature value, and an air inlet temperature sensor (34) that is configured to determine an air inlet temperature value, wherein the control system (12) is configured to determine an alpha value of a characteristic of the hydrodynamic system (10) from the water inlet temperature value, the water outlet temperature value, and the air inlet temperature value; to set an inverse of the alpha value of the characteristic of the hydrodynamic system (10) as an alpha value of a characteristic of the control valve (16) in combination with the actuator (14); and to control the control valve (16) with the actuator (14) using the set alpha value of the characteristic of the control valve (16) in combination with the actuator (14). The invention provides an improved control system (12) and a method for controlling a control valve (16) of a hydrodynamic system (10) using an actuator (14) having an optimal control performance and energy efficiency.

公开(公告)号：EP4528175A1

公开(公告)日：2025-03-26

申请号：EP24201573.3

申请日：2024-09-20

Applicant: Danfoss A/S

Inventor： MUHIC, Miran ,  CERNEKA, Iztok ,  BOGAR, Sinisa ,  LAWRESZUK, Dawid

IPC: F24H15/156 ,  F24F11/46 ,  F24H15/212 ,  F24H15/227 ,  F24H15/31 ,  F24H15/375 ,  F24F5/00 ,  F24F11/30 ,  F24F12/00 ,  F28D21/00

Abstract: Method for controlling the distribution of thermal energy in a commercial or industrial entity having a waste heat producing circuit connected to a primary side of a heat exchanger whose secondary side is connected to a heat recovery unit (HRU). To the heat sink side of the HRU a heat consuming circuit is connected. The method determines a first temperature range at which the waste heat producing circuit is operable at its optimal Energy Efficiency Ratio. Determines a second temperature range between a predetermined upper limit temperature and a predetermined lower limit temperature using the first temperature range and the heat exchange capacities of the heat exchanger and the HRU such that the waste heat producing circuit can be stably operated at its optimal Energy Efficiency Ratio (EER). And controls the fluid temperature in the return line by means of controlling one or more flow valves installed at the least at one or more heat energy consumer such that the temperature in the return line does not exceed the predetermined upper limit temperature neither fall below the predetermined lower limit temperature.