The disclosure relates to a method for controlling heat transfer between a local cooling system and a local heating system, the method comprising: determining a local energyconsumption need (LCC1, LCC2) of the local cooling system; determining a local energy consumption need (LHC1, LHC2) of the local heating system; controlling, based on the local energy consumption need (LCC1, LCC2) of the local cooling system and the local energy consumption need (LHC1, LHC2) of the local heating system, a heat pump (50, 50) connected between the local cooling system and the local heating system and configured to transfer heat from the local cooling system to the local heating system.

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.

A water heater comprising a heat pump device and a water tank is provided. A temperature controller operates the heat pump device based on a comparison of a measured water temperature and a set temperature. The water heater further comprises a source temperature sensor measuring the temperature of a heat source serving to provide heat energy to the heat pump device process. The source temperature sensor measures a source temperature and provides a source temperature value to the temperature controller. The temperature controller adapts an activation temperature in response to the measured source temperature. The water heater provides an improved accuracy of the temperature controller without unnecessarily reducing the life expectancy of the heat pump device. Furthermore, a corresponding method for controlling a heat pump device in a water heater is suggested.

A distribution valve controls a distribution ratio of a heat transfer medium between a hot water supply path including a heat exchanger for hot water supply and a beating circulation path through which the heat transfer medium is supplied to a heating terminal. A bypass flow rate control valve controls a bypass ratio which is a ratio of a flow rate of low temperature water introduced into a bypass pipe that bypasses the heat exchanger for hot water supply to a flow rate of low temperature water introduced into a water inlet pipe. The bypass ratio is regulated so that a hot water temperature detected by a temperature sensor reaches a hot water target temperature. During a simultaneous operation of hot water supply and heating, the distribution valve is controlled so that, when a bypass ratio is low, a distribution ratio is higher than when a bypass ratio is high.

An electric heater fire extinguishing strategy customization mechanism includes: a timing device for outputting the current operation time; a real-time display device installed onto an integrated circuit board of the electric heater and connected to the timing device for receiving the current operation time and displaying a red string corresponding to the real-time display and too-long operation information of when the current operation time exceeds a limit; a position sensing device installed onto the dot-matrix imaging mechanism for detecting the current position of the dot-matrix imaging mechanism, determining the difference between the current position and a predetermined fixed position, wherein the difference includes a horizontal change and a vertical change, and issuing a jitter sensing signal when the horizontal change changes between positive and negative values or the vertical change changes between positive and negative values. The electric heater includes a fire extinguishing function.

The integrated solar absorption heat pump system includes an absorption heat pump assembly (AHPA) having a generator, a condenser in fluid communication with the generator, an evaporator/absorber in fluid communication with the condenser and the generator, and a heat exchanger in communicating relation with the evaporator/absorber; a solar collector in fluid communication with the generator of the AHPA; a photovoltaic thermal collector in communicating relation with the evaporator/absorber of the AHPA; a plurality of pumps configured for pumping a fluid throughout the system to provide the desired heating or cooling; a power storage source, e.g., a solar battery, in communicating relation with the photovoltaic thermal collector; and a coil unit in communicating relation to the evaporator/absorber for receiving an air-stream. The absorption heat pump assembly can include an absorber and a solution heat exchanger.

The integrated solar absorption heat pump system includes an absorption heat pump assembly (AHPA) having a generator, a condenser in fluid communication with the generator, an evaporator/absorber in fluid communication with the condenser and the generator, and a heat exchanger in communicating relation with the evaporator/absorber; a solar collector in fluid communication with the generator of the AHPA; a photovoltaic thermal collector in communicating relation with the evaporator/absorber of the AHPA; a plurality of pumps configured for pumping a fluid throughout the system to provide the desired heating or cooling; a power storage source, e.g., a solar battery, in communicating relation with the photovoltaic thermal collector; and a coil unit in communicating relation to the evaporator/absorber for receiving an air-stream. The absorption heat pump assembly can include an absorber and a solution heat exchanger.

A heating, ventilation, and air conditioning (HVAC) system. The HVAC system includes a sensor that detects a temperature of a heater of a heating component and emits a signal indicative of the temperature. A flow management device controls a flow of electricity or fuel from a power source to the heating component. A controller receives the signal from the sensor and operates the flow management device to block the flow of electricity or fuel to the heating component when the signal is indicative of the temperature being above a set point.

A method for controlling a local distribution system's outtake of heat or cold from a thermal energy distribution grid. The method includes determining a base steering temperature for the local distribution system's outtake of heat from the thermal energy distribution grid, receiving a control signal indicative of reducing the steering temperature for the local distribution system's outtake of heat from the thermal energy distribution grid; determining a reduced steering temperature for the local distribution system's outtake of heat from the thermal energy distribution grid based on the control signal and the base steering temperature; determining a return temperature of a heat transfer fluid in the return, and upon the determined reduced steering temperature being lower than the return temperature, determining a temporary steering temperature higher than the return temperature and lower than the base steering temperature; and controlling the local distribution system's heat outtake based on the temporary steering temperature.

The disclosure relates to a method for controlling a thermal distribution system. The method comprises producing heat at a production plant, and determining a capacity limit of the production plant. At a central server, the current and/or forecasted production of heat in the production plant in relation to the capacity limit of the production plant is evaluated. The method further comprises to in response to the current or forecasted production at the production plant approaching the capacity limit, output from the central server a respective control signal to one or more of a plurality of local control units, and receiving the control signal at the respective local control unit. The method further comprises to in response to receiving the control signal at the respective local control unit, reduce an associated local distribution system's outtake of heat or cold from a distribution grid connected to the production plant.