Systems and methods for preventing freeze damage to heating system pipes are provided. In some embodiments, systems for preventing freeze damage to heating system pipes that carry a liquid used to heat a heated space and that are exposed to freezing temperatures outside of the heated space are provided, the systems comprising: a hardware controller that causes the liquid to be circulated through the heating system pipes irrespective of the air temperature in the heated space.

A hydronic system (1) includes a side (3) with a first port (21) connected with a source element output (23), a second port (27) connected with a source element input (29), and a controllable primary side flow actuator (9) for providing a primary side flow (q.sub.1). Another side (5) has a third port (31) connected with a load element input (33), a fourth port (35) connected with a load element output (37), and a controllable secondary side flow actuator (13) providing a secondary side flow (q.sub.2). A transfer element (17) is connected with the first port, the second port, the third port and the fourth port. A flow control module (39) adapts a transfer element thermal power transfer by controlling the primary side flow actuator and/or the secondary side flow actuator by minimizing a signed deviation value (ΔΔv) that is correlated with the transfer element thermal power transfer.

The present disclosure pertains to a system configured to prepare and use prediction models for classifying images. Some embodiments may: obtain, via a system return temperature sensor, a system return temperature; obtain, via an appliance return temperature sensor, an appliance return temperature; and responsive to a determination that the appliance return temperature is greater than the system return temperature by at least a first threshold amount, decrease, via a hardware processor, a speed of the appliance pump.

A controller configured to selectively set a reversible heat pump assembly (100) in either a heating mode or in a cooling mode is presented. The controller comprising a control circuit (44) configured to: for a time period, determine, using a demand determining function (50), a heating demand for heat from one or more local heating circuits (140) connected to the reversible heat pump assembly (100) and a cooling demand for cold from one or more local cooling circuits (140) connected to the reversible heat pump assembly (100); generate, using a control function (52), a control signal indicative of if the reversible heat pump assembly (100) is to be set in either the heating mode or in the cooling mode, wherein the control function is configured to use the heating demand and the cooling demand as input data; and send, using a transmission function (54), the control signal to a heat pump (110) of the reversible heat pump assembly (100). Also a method for controlling the reversible heat pump assembly (100) is presented.

A circulation pump assembly for a heating and/or cooling system includes an electric drive motor (108) and a connected pump housing (106) in which at least one impeller (118) is situated and which comprises a first inlet (112) and a first outlet (114). The pump housing (106) includes a second inlet (122) which is connected in an inside of the pump housing (106) at a mixing point (130) to the first inlet (112). A regulating valve (134), which is designed for regulating the mixing ratio of two flows mixing at the mixing point (130), as well as a control device, which controls the regulating valve (134) for regulating the mixing ration, are arranged in the pump housing (106). A hydraulic manifold is provided with such a circulation pump assembly.

A control method for a pump assembly (10, 12) in a pneumatic or hydraulic system controls a speed (n) of the pump assembly (10, 12) in dependence on at least one variable (Dp, p, T, x.sub.p) which is detected in the system. An error signal (e) is produced from the detected variable (Dp, p, T, x.sub.p) on the basis of a sectionwise monotonic function. On the basis of the error signal, the speed (n) of the pump assembly (10, 12) is controlled.

The invention relates to a method for the operation of a mixing device in a heating facility, in which mixing device two heating medium flows of different temperatures are mixed for adjusting the temperature of the heating medium, wherein the mixing device comprises at least one circulation pump assembly (24; 46) which delivers the heating medium, wherein the at least one circulation pump assembly (24; 46) is regulated in its speed in dependence on a temperature value which is detected in the heating medium, as well as to a mixing device for mixing the heating medium flows.

A computer-implemented method for controlling one or more components of a water utility system, the water utility system comprising at least one pump assembly, the method comprising: receiving a user indication indicative of a user-perceived acoustic-noise induced discomfort experienced at least at a first location, measuring at least a first sound signal at said first location, determining, based on the measured first sound signal and based on at least one of a received user indication of a degree of the user-perceived acoustic-noise induced discomfort and a received first operational parameter of the pump assembly, the first operational parameter being representative of an operational condition of the pump assembly at the time of said measuring the first sound signal, one or more adjusted control parameters of the water utility system, and controlling the water utility system based on the determined adjusted control parameters.

A system comprising a main circuit for routing a flow of heat transfer liquid out of a thermal storage to at least one outer heat exchanger and back to the thermal storage again, a main circulation pump configured to force the heat transfer liquid through the main circuit, a temperature sensor configured to measure the temperature of the heat transfer liquid, and a controller configured to control the main circulation pump based on temperature readings of the temperature sensor such that a calculated Reynolds number for the flow of heat transfer liquid is constant at a predetermined target Reynolds number over at least a primary temperature range.

Heat exchanger output control device in a one-pipe heating network characterized in that a first T-branch, which is connected to a second T-branch interconnected to a primary outlet pipe connection of a primary outlet pipe to a heat source through a primary outlet, is connected to the primary inlet pipe connection through a primary inlet. The first T-branch is connected to a secondary supply pipe connection through a secondary supply pipe with a secondary supply temperature sensor, and the second T-branch is connected to a secondary return pipe connection through a secondary return pipe with an additional secondary return temperature sensor. An impeller of a pump is connected to a secondary circuit to pump the heat-transfer medium from the first T-branch through a heat exchanger back to the second T-branch, and to connected to a electrical motor provided with a control unit connected to secondary supply and return temperature sensors.