Automated system to control coolant flow rate for heat supply of group of loads

FIELD: power engineering.

SUBSTANCE: control system includes a source of heat, supply and return pipelines, a unit of coolant flow rate control, comprising a flow rate controller and sensors of flow rate, temperature and pressure, installed on supply and return pipelines, a circulating pump, a heat energy processor, linked to sensors and the controller. To achieve the technical result, the unit of coolant flow rate control is equipped with sensors of temperature of external and internal air, at the same time the unit of coolant flow rate control, the circulating pump and the heat energy processor are installed on a load with higher thermal load, other loads of the system are equipped with sensors of coolant flow rate and sensors of internal air temperature, connected to the heat energy processor.

EFFECT: control of heat consumption of a group of loads without installation of a full complex of automatics devices with preservation of the temperature mode, which are connected to heat networks of buildings, which makes it possible to save capital costs, service costs, saving of thermal and electric energy.

1 dwg

 

The invention relates to the field of heat, and can be used in district heating systems deadlock thermal networks.

Known control system of a heat supply (see ed. mon. The USSR №1343196, IPC F24D 19/10, published. 07.10.1987)containing temperature sensors in the supply and return pipelines and temperature sensors outdoor air and indoor air, connected to the controller, the Manager with the actuator control valve, the actuator is equipped with limit microswitches.

Also known control system of a heat supply (see patent No. 2196274, IPC F24D 19/10, published. 10.01.2003), which includes sensors for measuring the temperature of the coolant supply and return piping, outside air temperature and the air inside the building, as well as regulating valve controlled by the controller.

The disadvantages of these systems, if implemented systems for consumer groups, is the need to incorporate a full range of automation devices for each of the consumers.

Technically close to the stated control system is a control system of a heat supply (see the patent for useful model No. 15775, IPC F24D 19/10, published. 10.11.2000)containing the heat source, the supply and return pipes closed heating network with larger connecting apertures is inanime to him drainage supply and return piping heating each of the consumers, site measurement, control and regulation of the coolant flow with flow sensors, temperature and pressure mounted on the supply and return pipelines, flow regulators, pressure and differential pressure, circulation pump, teploenergoresur associated with sensors and controllers.

The disadvantages of this system of regulation can be attributed to the redundancy of regulatory elements, the difficulty in precisely determining the necessary amount of heat to consumers in the absence of sensors internal and external air, and the increased cost of electricity to drive the circulation pump.

The technical result achieved by the present invention is the ability of heat regulation consumer groups without installing a full range of automation devices, while maintaining the temperature connected to heat networks of buildings.

The result is achieved that an automated system for controlling water flow to the heat consumer groups containing a heat source, supply and return pipes closed thermal network connected drainage supply and return piping heating each of the consumers, the control unit coolant flow, including the flow regulator and dates the IKI flow, temperature and pressure mounted on the supply and return pipelines, pump, teploenergoresur associated with sensors and controller, characterized in that the control unit of the flow rate of the coolant supplied by the temperature sensors outside and inside air, and the flow rate control unit coolant circulation pump and teploenergoresur installed on the consumer with the highest heat load (automated user), other users of the system (manual consumers) are equipped with sensors, flow, and temperature sensors internal air associated with teploenergoresur.

In Fig. shows a control system of a heat supply, where: 1 - the source of heat, 2 - automated user, 3 - user manual, 4 - teploenergoresur (TEP), 5 - supply pipe, 6 - return pipe, 7 - sensor coolant flow, 8 - flow regulator coolant, 9 - a set of sensors automated consumer, includes flow sensors, temperature and pressure of the coolant, 10 - circulating pump, 11 - temperature sensor of indoor air, 12 - temperature sensor, outdoor air.

Automated control system works as follows:

When change the environmental parameters so what you will need to increase the heat load consumers, TEC 4 gives a signal to the flow regulator 8 to increase the flow in automated user 2, which allows to maintain the desired temperature of the inside air aided 2 user, at the same time, user manual 3 begins to experience a shortage of thermal energy, which leads to a gradual reduction of the indoor air temperature monitored by sensor 11. When the temperature of the internal air user manual 3 to the lower limit, TEC 4 gives a signal to the flow regulator 8 to reduce flow in automated user 2, which leads to an increase of the expenditure on non-automated user 3 by increasing the pressure in the heating system. The expenditures for automated user is until until the consumption of non-automated user 3 does not reach the minimum required values ofdefined as follows:

;

where: Q - the current consumption of the building (Gcal/h)

c is the heat capacity of coolant (kcal/(kg·°C)),

tbelow.- current temperature in the delivery pipe (°C),

tarr.- the current temperature is round in return pipe (°C).

The current consumption of the building is defined by:

;

where: Qest.- current consumption of the building (Gcal/h)

- estimated internal air temperature (°C),

- estimated outside air temperature (°C),

tn- the current outdoor temperature (°C).

The current value of the temperature tntracked TEP 4 by means of the sensor 12, the current values of the temperature tarr., tbelow.with the aid of complex sensors 9.

Using the flow sensor 7 TEP 4 monitors the change of the expenditure on non-automated consumer, after reaching the value of consumption is equal to, TEC 4 stops to signal to the flow controller 8, thereby stabilizing the system, and then starts warming up manual user 3, and automated consumer 2 is gradually cooled, spending the accumulated heat. As soon as the temperature of the internal air user manual 3 reaches the upper limit, or the temperature of the inside air aided consumer 2 drops to the lower limit, TEC 4 returns the system to its original state.

Thus, the cycles of redistribution of costs which allow to observe the temperature regime is connected to the heat network of consumers without installing additional regulating devices, saving capital costs for installation of automatic devices and the cost of their maintenance, and also to save heat and electricity.

An automated system for controlling water flow to the heat consumer groups containing a heat source, supply and return pipes closed thermal network connected drainage supply and return piping heating each of the consumers, the control unit coolant flow, including the flow regulator and flow sensors, temperature and pressure, installed in supply and return pipelines, pump, teploenergoresur associated with the sensors and the controller, wherein the flow rate control unit coolant is supplied with temperature sensors outside and inside air, and the flow rate control unit coolant circulation pump and teploenergoresur installed on the consumer the greatest heat load, the other users of the system with sensors in the coolant flow rate and temperature sensors internal air associated with teploenergoresur.



 

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