In one example embodiment of a hydronic heating system, the system includes at least one condensing boiler and at least one non-condensing boiler, and at least one controller configured for utilizing at least one PID control program to generate at least one signal for controlling firing rates of one or more of the boilers based upon sensed water temperature and temperature setpoint inputs. Depending upon the mode of operation, the at least one PID control program is a first PID control program dedicated to controlling only the at least one condensing boiler, or is a second PID control program dedicated to controlling only the at least one non-condensing boiler, or includes both the first and second PID control programs. Also, outside air temperature serves as a basis for generating the temperature setpoint inputs.

A fluid transportation network (1) comprises a plurality of parallel zones (Z1, Z2), fed by a common supply line (L), with a regulating zone valve (V1, V2) in each zone (Z1, Z2) for regulating a flow of fluid (.sub.1, .sub.2) through the respective zone (Z1, Z2). A processing unit (RE) receives valve positions (pos.sub.1, pos.sub.2) of the regulating zone valves (V1, V2) and determines and sets an adjusted valve position for a line valve (VE) arranged in the supply line (L), depending on the valve positions (pos.sub.1, pos.sub.2) of the regulating zone valves (V1, V2). A processing unit (RE) further receives a measurement of a total flow of fluid (.sub.tot) through the supply line (L) and determines and sets adjusted valve positions for the regulating zone valves (V1, V2), depending on the measurement of the total flow of fluid (.sub.tot) through the supply line (L).

An apparatus configured to regulate the circulation of a fluid in a thermal plant includes a differential pressure regulator, a three-way selection valve, and a two-way zone valve. The apparatus can be installed according to a plurality of installation modes, in which: the differential pressure regulator intercepts the delivery circuit or the return circuit of the plant; the two-way zone valve intercepts the delivery circuit or the return circuit; the three-way selection valve is operatively interposed between the delivery circuit and the return circuit; a first inlet/outlet terminal of the three-way selection valve is placed in fluid communication with a high-pressure inlet or a low-pressure inlet of the differential pressure regulator; a second inlet/outlet terminal of the three-way selection valve is in fluid communication with a point of the delivery circuit or of the return circuit; and a third inlet/outlet terminal of the three-way selection valve is in fluid communication with a respective point of the return circuit, if the second inlet/outlet terminal is in communication with the delivery circuit, or of the delivery circuit, if the second inlet/outlet terminal is in communication with the return circuit.

For balancing a hydronic network that comprises a plurality of parallel zones with a regulating valve in each zone, individual flow characteristics are determined (S1) for each of the regulating valves, by recording the total flow of fluid measured at different valve positions of a respective regulating valve, while the remaining other regulating valves are set to a closed valve position. Dependent flow characteristics are determined (S2) by recording the total flow of fluid measured at different valve positions of the respective regulating valve, while the remaining other regulating valves are set to an open valve position. Correction factors are determined (S3) for each of the regulating valves, using the individual flow characteristics and the dependent flow characteristics. The hydronic network is balanced (S4) by setting the valve positions of the regulating valves using target flows and the correction factors.

A greenhouse, for cold weather climates, is configured with a gable that is offset toward the north wall and therefore the south extension of the roof, from the gable to the south wall is longer than the north extension. A greater amount of light can enter through this south extension and the inside surface of the north wall is configured with a reflective surface to allow light to be more uniformly distributed around the plants. The north wall may have no widows and may be thermally insulated to prevent the greenhouse from getting too cold during the night. A ground to air heat transfer (GAHT) system may be configured to produce a flow of greenhouse air under the greenhouse for heat transfer, to moderate the temperature of the greenhouse. A thermal medium may flow to a thermal reservoir for heat exchange with the conduits of the GAHT system.

When a hot water supply operation is started, a single mode is used in which hot water is output only from a second hot water supply circuit of a water heater, by cut-off of a flow path in a first hot water supply circuit of a space-heating water heater by a cut-off mechanism. When a load imposed by hot water supply by the second hot water supply circuit increases during the hot water supply operation in the single mode, the cut-off mechanism is opened to start hot water output from the first hot water supply circuit and a hot water supply operation in a parallel mode is performed in which hot water is output from both of the first hot water supply circuit and the second hot water supply circuit.

A system for supplying a regulatable inflow fitting, a vehicle with such a system, and a method for filling such a system. The system for supplying the regulatable inflow fitting with temperature-controlled water includes a cold water feed, a water heater, a bypass line and a mixing valve. At an input side, the water heater is connected to the cold water feed. At an output side, the water heater is connected to a hot water inlet of the mixing valve. The bypass line directly connects the cold water feed to a cold water inlet of the mixing valve. The mixing valve is connected at the output side to the inflow fitting and is configured to provide temperature-controlled water depending on a valve position. A flow element is integrated in the bypass line that at least temporarily at least limits a flow rate through the bypass line.

The invention concerns a thermostatic radiator valve (TRV, 21), comprising an aperture to adjust a flow of heating fluid from a heat generator (10) entering a heat emitter (11) in a first room (101) based on a first TRV-defined temperature setpoint, the TRV (21) comprising: a communication link (31) to a processing unit connected to a thermostat (60) controlling the heat generator (10); an input interface configured to one or more of: allow a user to enter or acquire the first TRV-defined temperature setpoint;
wherein the TRV (21) is further configured to receive from the processing unit a first aperture setting, the first aperture setting being defined as a function of a temperature configuration model available at the processing unit.

A zone controller works with a modulating unit comprising memory storing an instruction set and data related to thermostats, a plurality of duty cycles for a plurality of zones, a plurality of time periods for the plurality of zones, and a maximum zone load. A processor is operative to provide a modulating signal to the modulating unit based on the maximum zone load. The modulating signal determines operation of the modulating boiler and the maximum zone load based on the plurality of duty cycles, time periods, and data related to thermostats. The zone controller may be further operative to: calculate a first duty cycle for the first zone based on a first time period; calculate a second duty cycle for the second zone based on a second time period; and determine a maximum zone load, which is a greater of the first duty cycle and the second duty cycle.

A method for controlling a district thermal energy distribution system is presented. The method comprises: determining whether a local pressure difference between a feed line (111) and a return line (112) of a distribution grid (110) is below a predetermined threshold; upon the local pressure difference is determined to be below the predetermined threshold, generating a control signal comprising information instructing a local distribution system (150) to reduce outtake of heat or cold from the distribution grid (110); sending the control signal to a local control unit (140) of the local distribution system (150); and reducing, in response to the control signal, the outtake of heat or cold of the local distribution system (150) from the distribution grid (110). The distribution grid (110) may be a district heating grid or a district cooling grid. Also, a control server and a district thermal energy distribution system is presented.