A demand based control for a hydronic heating system varies the heat response based on an actual demand of the conditioned space, rather than an estimated thermal loss. Differences between supply and return of a heat transfer medium, such as forced hot water, are measured for the conditioned space, as well as the flow rate of the forced water to determine an actual thermal transfer to the conditioned space. A required heat generation is computed based on the measured transfer and resultant temperature change of the conditioned space, and heat generation parameters such as boiler firing rate and circulator pump speed varied to control the heat transfer to the conditioned space and avoid overshoot or excessive heat generation beyond that needed for the measured demand.

A multi-temperature output fluid heating system including an input for receiving a fluid supply, a single heating source, a first output, a second output and a bypass path. The first output is fluidly connected to the input, where the first output is adapted for control by a first control device and to receive heat from the single heating source to achieve a first temperature at the first output. The bypass path fluidly connects the input and the second output. The input is adapted to empty a first portion of the fluid supply into the first output and a second portion of the input into the bypass path. The second output is adapted to receive an output from the first output and an output from the bypass path to achieve a second temperature.

A heat-pump circuit may include an indoor heat exchanger, an outdoor heat exchanger, a compressor adapted to circulate a working fluid between the indoor and outdoor heat exchangers, and an expansion device disposed between the indoor and outdoor heat exchangers. A monitor for the heat-pump system may include a return-air temperature sensor, a supply-air temperature sensor, and a processor. The return-air temperature sensor may be adapted to measure a first air temperature of air upstream of the indoor heat exchanger. The supply-air temperature sensor may be adapted to measure a second air temperature of air downstream of the indoor heat exchanger. The processor may be in communication with the return-air temperature sensor and the supply-air temperature sensor. The processor may be programmed to determine a working-fluid-charge condition of the heat-pump system based on the first and second air temperatures.

A hot water circulation system comprises a water heater having a cold-water inlet and a hot water outlet. A water pump circulates water through the water heater to produce hot water. The hot water is circulated to a thermal bypass valve, which is configured to close when hot water contacts a heat activated seal. A bypass circuit is coupled between the hot water outlet and the cold water inlet of the water heater. The bypass circuit prevents hot water from circulating from the hot water outlet to the cold-water inlet when the thermal bypass valve is open and promotes circulating hot water from the hot water outlet to the cold water inlet when the thermal bypass valve is closed. Upon a temperature sensor sensing hot water entering the cold-water inlet, the water heater turns of the water pump.

The present disclosure discloses a heating adjustment method and device, which belongs to the field of thermal system management technologies. The method includes: calculating an average indoor temperature of a cell, wherein the average indoor temperature of the cell is an average value of a real-time indoor temperature of each dwelling unit in the cell; judging whether the average indoor temperature is within a standard temperature range; and adjusting at least one of a water pump flow and a water temperature supplied to the cell when the average indoor temperature is not within the standard temperature range. When the average indoor temperature of the current cell is abnormal, the temperature of the cell is restored to a standard value by adjusting the water pump flow and the water temperature for heating, thus the response speed is fast, the reliability is high, the user experience is improved and energy is saved.

An Organic Rankine Cycle power generation system includes: a first heat storage tank having a closed cylindrical shape and including a first internal heat exchanger therein; a second heat storage tank including a second internal heat exchanger therein; a first circulating pipe branched from a high temperature water supply pipe; a second circulation pipe branched from the high temperature water supply pipe; a first cold water supply pipe supplying cold water from the outside to the inside of the first heat storage tank; a second cold water supply pipe supplying cold water from the outside to the inside of the second heat storage tank; and an opening and closing unit selectively opening and closing the first circulation pipe and the second circulation pipe, and the first cold water supply pipe and the second cold water supply pipe.

A temperature control system for controlling the temperature of a room and a composite element for a temperature control system.

A hose nozzle assembly which is capable of heating water comprising an internal heating chamber with at least one heating element. The hose nozzle assembly is able to heat water from a common garden hose with the ability to control both flow rates and temperature.

A heat storage system includes a compressor that compresses refrigerant; a heat storage tank that stores a heating medium; heat exchange means provided outside the heat storage tank for heating the heating medium using heat of the refrigerant compressed by the compressor; a heat accumulating circuit including a feed path that feeds the heating medium flowing out of the heat storage tank to the heat exchange means, a return path that returns the heating medium heated by the heat exchange means into the heat storage tank, and a pump that circulates the heating medium; and control means capable of executing an initial operation that controls an operating frequency of the compressor at the beginning of a heat accumulating operation in which the heating medium heated by the heat exchange means is accumulated in the heat storage tank. The initial operation includes a first operation that maintains the operating frequency at a first frequency and, after the first operation, a second operation that maintains the operating frequency at a second frequency higher than the first frequency.

A method controls a household appliance being or containing a water heater with regard to limescale deposition. The method includes generating at least one thermal pulse by operation of an electrical heating element of the water heater, and measuring a plurality of successive temperature values. The method further includes determining one or more parameter values of a measurement pattern arising from the plurality of successive temperature values and their respective time of measurement, and ascertaining a limescale deposition state of the water heater based on the determined parameter value. A household appliance contains a computer readable medium having stored thereon instructions configured to trigger, when executed, the household appliance to perform such a method.