Device for regulating the air temperature in the greenhouse

 

(57) Abstract:

The device allows you to adjust the temperature of the air in the greenhouse. It contains the feed and discharge lines, three-way mixing valves, computing unit and the control units, the unit of the desired temperature sensors, the temperature of external and internal air and coolant. The technical problem which is solved by this invention is to improve the uniformity of temperature over the entire area of the greenhouse in the amount of cenosis. This task is solved in that the greenhouse is divided into heating zones containing heating system, equipped with sensors for air temperature and coolant. Computing unit connected to the input of each control unit that supports the temperature of the heat carrier in the heating system heating zones. Prior to the mixing valves are mounted in blocks regulation of the pressure difference between the two supply and the second supply and discharge pipelines and have their own control units and sensors pressure flow lines and including a by-pass pumps, they also include two passage control valve with its own control unit, the inputs of which are connected to the outputs of the sensors on the building in zones of the greenhouse depending on the current settings of the external environment. 1 Il.

The invention relates to agriculture, in particular to devices for regulating the climate in greenhouses block type.

A device for regulating the air temperature in the greenhouse, containing a system of the above-ground heating system and roof heating, which includes three-way mixing valve having a control unit and connected to the first inlet and outlet nozzles respectively to the supply and discharge pipes of the heating system, computing unit, the inputs of which are connected to the outputs of the temperature sensors of external and internal air and the liquid roofing and heating unit temperature of the internal air.

A disadvantage of the known device is that it provides for the regulation of the average air temperature in the greenhouse and does not take into account the estimated parameters of the greenhouse and heating systems, with local variations in the temperature zones of the greenhouse exceed 4 - 5oC medium temperature.

The task was to create devices that enhance the uniformity of temperature over the entire area of the greenhouse in the amount of cenosis.

Possiamo above-ground heating system and roof heating, which includes a three-way mixing valve having a control unit and connected to the first inlet and outlet nozzles respectively to the supply and discharge pipes of the heating system, computing unit, the inputs of which are connected to the outputs of the temperature sensors of external and internal air and the liquid roofing and heating unit temperature of indoor air, according to the invention in the system of roofing heating entered regulating valve having a control unit and mounted for three-way mixing valve of this heating system, and the system of the above-ground heating comprises heating systems placed in the heating zones of the greenhouse and including three-way mixing valves, with the control unit and connected to the first input and output connections respectively to the supply and discharge pipes of the heating system, the device entered the sensors of the indoor air temperature in the heating zones of the greenhouse, connected to the corresponding inputs of the computing unit, the outputs of which are connected with the inputs of the control units of all three-way mixing valve and control valve system Ceny second nozzle three-way mixing valves of all heating systems and blocks regulation of the pressure difference, respectively, between the inlet and the second inlet and outlet pipes, the first of which includes the first lock control valve installed at the inlet of the first feed pipe and having its own control unit, the input of which is connected to the outputs of pressure sensors, flow lines, and the control unit of the pressure difference between the second supply and discharge piping includes a bypass pump, connected between the inputs of the second supply and discharge pipelines, and is in parallel with these pumps second pass control valve, with its own control unit, the inputs of which are connected to the outputs of the pressure sensors in the second supply and discharge pipelines.

The device provides uniform temperature in the greenhouse due to separate control of heating systems in zones of the greenhouse, characterized by different size and changing in time and in space climatic conditions of the external environment.

Programs computing unit provides the definition of the current temperature corresponding to a given temperature in the greenhouse for each heating system depending on the set temperature of the air in the greenhouse, acousmatics site conditions construction of the greenhouse.

The division of functions between the computing unit and controls the temperature of the heat carrier provides in the intervals between cycles, sufficient for the implementation of the temperature perturbation in the greenhouse, stable, maintaining the desired temperature of the fluid at any given point in time for each heating system and allows operational control temperature in the greenhouse with the amendments to the changing in space and in time, the climatic conditions of the external and internal environment.

The proposed solution allows to improve the temperature regime in the greenhouse.

Toeplitz block type is divided into a number of conventional heating zones (not shown) with independent heating systems and controls and regulation.

Device for regulating the air temperature in the greenhouse contains a system of the above-ground heating system and roof heating. The roofing system includes heating three-way mixing valve 6, with the control unit 26 and is connected to the first inlet and outlet nozzles respectively to the supply 1 and the outlet 3 to the piping of the heating system, as well as podklyuchenie connected to the outputs of the sensor 13 outdoor air temperature, knob 14 of the desired air temperature in the greenhouse with software control, sensor 15, the temperature of the coolant roofing heating.

The system above-ground heating comprises heating systems placed in the heating zones of the greenhouse, including the three-way mixing valves 7, 8, 9, 10, 11, with control units 27, 28, 29, 30, 31. Valve 7, 8, 9, 10, 11 connected to the first input and output connections respectively to the first inlet 1 and outlet 3 pipelines of the heating system of the greenhouse.

In a device for controlling air temperature in the greenhouse entered the sensors 16, 17, 18, 19, 20 the temperature of the system above-ground heating and sensors 21, 22, 23, 24, 25 of the indoor air temperature in the heating zones of the greenhouse, connected to the corresponding inputs of the computing unit 12, the outputs of which are connected with the inputs of the control units 27, 28, 29, 30, 31 three-way mixing valves 6, 7, 8, 9, 10, 11 and flow control valve 39 roofing system heating.

A heating system entered the supply pipe 2 which is connected to the second input connections three-way mixing valves 6, 7, 8, 9, 10, 11 all heating systems and the blocks 34, 37 regmi. The first block 34 regulation of the pressure differential includes first passing of the regulating valve 5 is installed at the inlet of the first feed 1 pipeline and have their own control unit, the inputs of which are connected the outputs of the pressure sensors 32, 33 in the supply pipes 1, 2. Block 37 regulation of the pressure differential between the second feed 2 and outlet 3 pipelines includes a bypass pump 4 connected between the inputs of the second feed 2 and outlet 3 of pipelines and pumps connected in parallel to the 4 second pass control valve 38, which has its own control unit, the inputs of which are connected to the outputs of the pressure sensors 35, 36 in the second feed 2 and outlet 3 pipelines.

Device for regulating the temperature of a block of greenhouses (see drawing) works as follows.

The signals of the sensors 13, 21, 14, 16, respectively, the current temperature of the external and internal air unit indoor air temperature and the current temperature of the coolant downstream of the regulating valve 7 of the first heating system for above-ground heating (conditionally) for one of the heating zones of the greenhouse arrive at the computing unit 12, where on the basis of the received Yes the greenhouses and define the required temperature for the first heating system in a given time. Then the signal from the computing unit 12 is supplied to the control unit 27 of the regulating three-way mixing valve 7 to maintain the necessary temperature for the first zone of heating. Once the signal computing unit 12 switches to the second zone heating system for heating, then the third and so on for all heating zones. For each of the heating zones is determined by the current temperature of the heat carrier, which sensors 16, 17, 18, 19, 20 is transmitted to the control units 27, 28, 29, 30, 31 control valves 7, 8, 9, 10, 11, respectively, for each zone heating greenhouses. After a time determined depending on the design of solutions of systems of heating and initial conditions processes determine the current temperature of the coolant and transmission to maintain the valves again.

The knobs 14 of the indoor air temperature and the sensor 13 outside air temperature are common for all heating systems. All other temperature sensors are provided for each heating system separately.

In contrast to systems of the above-ground heating system roof heating works on the program, depending on the temperature neroinfotool signal to the control unit 26 regulates the three-way mixing valve 6, which opens to a full (100%) income return coolant delivery pipe 2. While passing the control valve 39 is open. With further increasing temperature, for example below -20oC, computing unit 12 receives the signal to the control unit 26 by the valve 6 to maintain the appropriate temperature of the coolant in the system roofing heating. The relationship between outdoor temperature and coolant are determined in each case depending on the climate zone and constructive solutions of systems of heating. With increasing temperature above +15oC (conditionally) pass control valve 39 is closed, and Vice versa, when the coolant temperature is below +15oC (should work roofing system heating) valve 39 is automatically opened and begins to operate the three-way mixing valve 6 in the automatic mode. Process on and off the roofing system of heating is often repeated throughout the day depending on the time of year. The output signal of the sensor 15, the temperature of the coolant roofing heating is taken into account in the management process as well as from sensors 16, 17, 18, 19, 20 for roofing fencing is determined in the same way as for systems above-ground heating, when the heating system roof turns on when the outside temperature is -15oC and below. The boundary temperature -15oC is conditional, it can be within -5 - -15oC depending on the design of the climatic conditions of the construction site.

Pressure equalization is carried out by two independent blocks control pressure differential 34, 37 respectively between supply 1, 2, feed 2 and outlet 3 pipelines. Between supply 1, 2 piping supports zero pressure, to which the signals from the pressure sensors 32, 33 in the input 1, 2 pipelines act on the control unit pressure drop 34 through valve 5. When the pressure difference between the delivery pipe 1, 2 P>< 0, the control unit pressure drop 34 receives the signal for closing or opening the flow control valve 5 until the pressure balance.

Between inlet 2 and outlet 3 pipelines supported by the pressure difference P = A, the corresponding hydraulic resistance heating system, for this purpose, the signals of the pressure sensors 35, 36 in the input 2 and outlet 3 pipelines are received at the control unit level difference is; with the control unit pressure drop 37 receives the signal for closing or opening the flow control valve 38 to the moment when P = A. If a pass valve 38 in the regulatory process pressure is completely closed, a signal to turn on one of the pumps 4. At the next closing of the flow control valve 38 receives a signal to switch on the next recirculation pump 4, and so on, If the lock control valve 38 in the regulatory process pressure is fully opened, a signal to disconnect a single pass of pump 4, when following the full opening of the flow valve 38 receives the signal to shut off the next pump 4 and so on, When one of the pumps 4 is constantly in use.

The use of the proposed device for regulating the air temperature in the greenhouse can improve the temperature regime in the greenhouse, to increase the yield of crops.

Device for regulating the air temperature in the greenhouse, containing a system of the above-ground heating, which includes three-way mixing valve having a control unit and connected to the first input and output connections respectively to the supply and tchikov temperature of external and internal air and the liquid roofing and heating unit of the indoor air temperature, characterized in that the roofing system heating entered regulating valve having a control unit and mounted for three-way mixing valve of this heating system, and the system of the above-ground heating comprises heating systems placed in the heating zones of the greenhouse and including three-way mixing valves with the control unit and connected to the first input and output connections respectively to the supply and discharge pipes of the heating system, the device entered the sensors of the indoor air temperature in the heating zones of the greenhouse, connected to the corresponding inputs of the computing unit, the outputs of which are connected with the inputs of the control units of all three-way mixing valve and control valve system roofing heating, and a heating system entered the second supply pipe that is connected to the second input connections three-way mixing valves of all heating systems and blocks regulation of the pressure difference, respectively, between the inlet and the second inlet and outlet pipes, the first of which includes the first lock control valve installed at the inlet of the first pollenia flow lines, when the control unit pressure difference between the second supply and discharge piping includes a bypass pump, connected between the inputs of the second supply and discharge pipelines, and is in parallel with these pumps second pass control valve, with its own control unit, the inputs of which are connected to the outputs of the pressure sensors in the second supply and discharge pipelines.

 

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