SU1565407A1 - Heat supply system of hothouse plant - Google Patents

Abstract

The invention relates to agriculture, more specifically to crop production on an industrial basis in buildings of protected ground. The purpose of the invention is to optimize the temperature regime of the greenhouses of the greenhouse complex by mutual compensation of changes in the heating parameters of the greenhouse blocks. The ratio controller 9 subtracts the signals from the sensors 10 of the pressure differential, moves the actuators of the control valves 7 in different directions with the help of the actuators 8 to the throttles of the heating water in the supply 5 main pipelines. At the same flow rates, the heat of the heating water flowing to the heating of the nearest greenhouse 4 is throttled to a greater extent. The ratio controller 9 will maintain the specified differential pressure difference (in particular, zero) regardless of the change in heating water flow for heating greenhouses 4 and changes pressure drops on the collectors 2 and 3 of the heat supply source 1. 2 Il.

Description

(21) 4367925 / 31-15

(22) 21 01 88

(46) 05.2390 Bulle No. 19

(71) Tselinograd Agricultural Institute

(72) L. I. Gurvich, D. G. Kirchev and P. A. Tolstoy

(53) 631 344.8697.3 (088.8)

(56) M. M. Apartsev. Adjustment of water systems for centralized heat supply .- M .: Energoatomizdat, 1983, p. 64, fig. 8.15g.

(54) HEAT SUPPLY SYSTEM OF HEATING COMBINE

(57) The invention relates to agriculture, more specifically to crop production on an industrial basis in greenhouses. The purpose of the invention is to optimize the temperature regime of the greenhouses of the greenhouse complex by mutual compensation of changes in the heating parameters of the greenhouse blocks. The ratio controller 9, by subtracting the signals from the sensors 10 of the pressure differential, moves the actuators of the control valves 7 in different directions with the help of the actuators 8 in order to throttle the respective flows of the heating water in the supply 5 main pipelines. At the same flow rates, the flow of heating water going to heat the nearest greenhouse 4 is throttled to a greater extent. The ratio controller 9 will maintain the specified differential pressure difference (in particular, zero) regardless of the change in heating water flow for heating greenhouses 4 and changes in pressure drops pressure on collectors 2 and 3 of the heat source 1 2 silt

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The invention relates to agriculture, to the field of crop production on an industrial basis in buildings of protected ground.

The aim of the invention is to optimize the 5 Qi of the temperature regime of the greenhouses of the greenhouse complex by mutual compensation of changes in the heating parameters of the greenhouse blocks.

Fig. 1 is a functional diagram of the greenhouse heat supply system. combine; in fig. 2 - electrical circuit diagram of the connection of blocks and elements of the heat supply system.

The heat supply system of the greenhouse complex contains a source of heat engineering with supply 2 and outlet 3 collectors of heating water, two greenhouse blocks 4 connected to the collectors by means of supply 5 and outlet 6 main pipelines of the heating network of greenhouse blocks, two control valves 7, installed between the inlet manifold and the main pipeline. Valves 1 are equipped with actuators 8 The system also includes a ratio controller 9, the inputs of which are connected to the outputs of 10 differential pressure sensors installed on the main pipelines before the thermal inputs of both greenhouse blocks 4, and the outputs are connected to the corresponding terminals of the actuators 8 of the regulator 20 steering valves 7.

As a regulator 9 ratios, any commercially available proportional or proportional-integral regulator with two or more inputs can be used, for example, regulators of the type P25 1 RPIB-Sh, P21, RP2-PZ and the like. The use of these regulators as regulators of the ratio 9 provides for the antiphase activation of pressure differential sensors 10. The ratio of the signals from the sensors can be changed by changing the reference of the controller, for which the rheostatic setting device built into the controller is used. The inputs of the controller 9 of the ratio are signals from the sensors 10 of the differential pressure 45 In the case that sensors with differential transformer are used circuit, their output signal is 10-0 +10 mA, and if the sensors with analog output - output signal is 0-5 mA. The output of the ratio controller 9 also depends on the brand of the controller. In the above regulators, the output signal is pulses with adjustable duration

As pressure differential sensors 10, commercially available gg sensors, such as DM, DMN, DME, can be used. DKOFM Sapphire, diffinometers of a unified GPS system, etc. The value of the pressure differential is

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Heterizes the consumption of heating water for heating the greenhouse blocks 4 of the greenhouse complex and depends on the configuration of heating networks (length and diameter of pipelines, valves) and the characteristics of the network pumps of the heat supply source.

As actuators 8, actuators with two-phase capacitor motors of the PR type can be used. The output "Reducing the signal of the regulator 9 is connected to the terminal A of the left and terminal B of the right actuators 8. And the output" Increasing the signal of the regulator 9 is connected to the terminal B of the left and the terminal A of the right actuators 8, i.e. actuators 8 connected asynchronously. Consequently, the actuators 8 in any case rotate in different directions.

The heat supply system of the greenhouse complex operates as follows.

In accordance with the purpose of the invention, it is necessary to maintain the same pressure drops at the thermal inlets of the greenhouse blocks 4, regardless of the current value of the heating water flow rates. Since the greenhouse blocks 4 are connected to the same heat supply source 1, opening (closing) one of the control valves 7 (right and left) causes a corresponding increase (decrease) in pressure drop behind this (right or left) control valve 7 and a decrease (increase) in pressure drop after another (left or right) valve 7

The regulator 9, subtracting the signals from the sensors 10 of the pressure differential, moves in different directions the plungers of the control valves 7, to the throttle in appropriate ways the flows of the heating water. At the same flow rates, the throttling flow of heating water goes to heating the nearest greenhouse 4 unit. This stabilizes the specified differential pressure difference (in particular, zero) between the thermal inputs of the greenhouse unit 4. The variable regulator 9 maintains the specified differential pressure difference regardless of changes in the costs of heating water for heating greenhouses 4 and from changes in pressure drops at the collectors 2 and 3 of the heat supply source 1, since regulator 9 is a ratio controller . The latter property allows centralized quantitative control of the temperature regime of greenhouses 4, since the change in pressure drop between the collectors of the heat supply source leads to the same change in pressure drop before both heat inputs and, therefore, the same change in the consumption of heating water for each block of greenhouses 4.

Thus, for example, with an increase in the water consumption for heating the right-hand block of greenhouses 4, the pressure drop at its inlet decreases. The ratio controller 9 in order to equalize the pressure drops at the inputs of the right and left blocks of greenhouses 4 lowers the plunger of the left adjustable valve 7 and raises the plunger of the right valve 7, thereby reducing the hydraulic resistance of the right branch and increases the hydraulic resistance of the left branch. This will ensure the same pressure drops at the inputs of both blocks of greenhouses.

The invention makes it possible to improve the quality of temperature control of greenhouses of a combine due to uniform distribution of heat between blocks of greenhouses and the possibility of centralized qualitative and quantitative control of their temperature range.

Claims (1)

Invention Formula The heat supply system of the greenhouse complex, containing a heat supply source with a supply and discharge collective 5 0 five 0 heating water and communicated with them respectively the supply and discharge main pipelines of the heating networks of two greenhouse blocks, two control valves with actuators installed on the supply main pipelines of the heating networks, and two pressure differential sensors between the supply and discharge pipelines of the heating networks of each block of greenhouses, located in front of thermal inputs of blocks of greenhouses behind the control valves, characterized in that, in order to optimize the temperature of the greenhouse complex by means of mutual compensation of changes in the heating parameters of greenhouse blocks, it is equipped with a ratio controller having outputs “Signal Increase and” Signal Decrease, while the inputs of the ratio controller are out-of-phase with the outputs of the differential pressure sensors, and outputs “Signal Increase and “The signal reduction is connected to the pairwise asynchronously connected terminals of the control valve actuators.