KR20080084192A - Control system for heating and the same control method - Google Patents

Abstract

A control system and a control method is provided to update the opening of flow control valves in real time corresponding to the temperature condition of each room after setting initial opening of flow control valves to flow same amount of water per unit pipe length. A heating system includes return piping(3) and supply piping(4) connected to a boiler(2), heating pipes(5,6,7) placed between the return piping and the supply piping, flow controllers(16,17) composed of flow control valves(15b,16b,17b) and flow sensors(15a,16a,17a) installed at each end of the heating pipes, room controllers(20,21,22) installed in each room to set target room temperature and to measure actual temperature, and a controller(25) to adjust the opening of the flow control valves with the signal provided the room controllers.

Description

Heating system and heating control method {Control system for heating and the same control method}

1 is a block diagram showing the structure of a heating system of the present invention,

2 is a flow chart for explaining the operation of the heating system of the present invention,

3 is a graph showing the relationship between the opening rate and the flow rate ratio of the flow control valve of the present invention.

Explanation of symbols on the main parts of the drawings

1-heating system 2-boiler

3-Return pipe 4-Supply pipe

5,6,7,-Heating piping 8,9,10-Room

15a, 16a, 17a-Flow sensor 15b, 16b, 17b-Flow control valve

15,16,17-Flow regulator 20,21,22-Room cone

25-controller

The present invention is a heating system having a flow controller consisting of a flow sensor and a flow control valve in each of the plurality of rooms, and a room cone capable of temperature setting and measurement, wherein the conditions are uniform without variation even if the area and the set temperature of each room are different. The present invention relates to providing a heating system for heating each room.

In general, when there are several rooms, the longer the room or the larger the area from the boiler, the longer the heating time or the deviation of the heating conditions in each room. Conventionally, in order to compensate for the deviation of the heating conditions of each room, the opening degree of the flow control valve is manually adjusted, or the temperature condition of each room is sensed to independently control the opening degree of the flow control valve connected to each room. I'm using a system that allows it.

However, in the conventional heating system, since the flow rate of the heating water is independently controlled by applying the temperature conditions of each room, there is a problem that the variation in the heating time and the intensity of the heating time according to the temperature conditions of each room are changed. That is, even in a room with the same temperature condition, when the area of the room is small, the heating temperature is set in a short time, while in the case where the room is large, the heating time is long until the heating temperature is reached. Even if it compensates, there is a limit to uniform heating time.

The present invention has been made in order to solve the above problems, regardless of the area of each room, the length of the heating pipe, the flow control valve of each room so that the compensation for the heating time is made in a uniform condition according to the temperature conditions of each room It is an object of the present invention to provide a heating system capable of updating and controlling the opening degree in real time.

In order to achieve the above object, the present invention installs pipes in each room with pipes having the same diameter, and installs a flow regulator consisting of a flow sensor and a flow control valve in the return pipe of each room, and sets the temperature and temperature of each room. Install a room cone can be measured, the flow controller and the room cone is installed to be connected to the controller.

In particular, in the present invention, since the pipe diameters are the same, the maximum flow rate flowing through the pipes of each room is measured to estimate the ratio of pipe lengths in each room, and the pipes in each room have the same flow rate per unit length of the pipe in each room. After setting the initial opening degree of the flow regulating valve according to the ratio of length, the opening degree of the flow regulating valve is real-time based on the initial opening degree of the set flow regulating valve according to the deviation degree of the set temperature of each room and the actual measurement temperature. To be updated.

The present invention provides a boiler, a plurality of heating pipes connected in parallel between the return-side pipe and the supply-side pipe connected to the boiler, the return-side pipe and the supply-side pipe, and a flow rate installed at one end of the plurality of heating pipes, respectively. A flow controller comprising a control valve and a flow sensor, a room cone installed in a room partitioned by the excretion of the plurality of heating pipe lengths, and the temperature setting and temperature measurement of the room; In the heating system having a controller for adjusting the opening degree of the flow control valve,

The controller calculates a ratio of pipe lengths of the respective rooms by using the flow rate measured by each flow sensor in a state in which the respective flow control valves are opened to the maximum, and for each room according to the calculated ratio of pipe lengths. It is characterized in that the initial opening of the flow rate control valve of each room is set so that the same flow rate is supplied per unit length of the pipe.

The controller may set the initial opening degree of the set flow regulating valve in real time according to the difference between the set temperature received from the room cone of each room and the room temperature of the room after the initial opening degree of the flow regulating valve of each room is set. It is characterized in that it is configured to be updated.

In addition, the diameter of the heating pipe is characterized in that the same.

Hereinafter, the technical configuration and operational effects of the heating system of the present invention will be described in detail by examples.

(Example)

The heating system 1 of the present invention is connected in parallel between the boiler 2, the return side pipe 3 and the supply side pipe 4 connected to the boiler, and the return side pipe and the supply side pipe as shown in FIG. A plurality of heating pipes (5), (6), (7) are provided. Each of the heating pipes is installed so that the lengths of the heating pipes are set at the same area ratio on the floors of the rooms 8, 9, and 10 having different sizes by using pipes having the same diameter, and the return side Between the pipe and the end of the heating pipe 5 of the room 8, a flow regulator 15 composed of a flow sensor 15a and a flow control valve 15b is provided.

In the same structure, a flow regulator 16 composed of a flow sensor 16a and a flow control valve 16b is provided at the end of the heating pipe 6 of the room 9, and the heating pipe 7 of the room 10 is provided. At the end of the flow rate, a flow regulator 17 consisting of a flow sensor 17a and a flow regulating valve 17b is installed.

In addition, each room is provided with room cones 20, 21, 22 for measuring or setting the room temperature of the room, and the room cones 20, 21, 22, and the flow regulators. 15, 16, and 17 are connected to the controller 25.

The controller 25 calculates the maximum flow rate of the flow rate sensor flowing in the heating pipe of each room while the flow rate control valve of each room is completely opened, and calculates a value of the flow rate in the heating pipe of each room. The opening degree of the flow regulating valve of each room is controlled and set so that the opening degree of the flow regulating valve of each room is real-time according to the signal received from the room cone of each room with the initial opening degree of the flow regulating valve of each room being set. Control to be updated.

The heating pipes 5, 6, and 7 of the present invention use an Excel pipe of a nominal diameter of 15 A and 150M in the floor area of the room 8, the slope of which is closed, 80M in the floor area of the room 9, and the room. 50M was respectively comprised by the same area ratio in the floor area of (10).

In addition, the flow regulators 15, 16, and 17 used globe valves of 15 A standard, and after setting the temperature of the boiler so that the temperature of the heating water flowing in the supply pipe was maintained at 55-60 degrees, Measure the maximum flow rate of the return-side heating pipe (measured by opening the flow control valve to the maximum) and tabulate the ratio of the estimated length of each heating pipe, and use the tabled ratio of the estimated length of the heating pipe. Calculate the flow rate of each heating pipe with the control valve fully open.

Moreover, each flow control valve is made by making the data value which measured the flow rate ratio according to the change of the opening degree of a flow control valve into a table, and selecting the opening degree of the flow control valve corresponding to the computed flow rate of each said heating piping from the said table. Allow the initial opening of to be determined.

First, the process of obtaining the ratio of the estimated length and flow volume of each heating pipe using a flow rater is demonstrated.

In the pipe engineering fluid flow ▽ h = f L / D and V ² / 2g (▽ h: pressure loss, f: loss factor, L: pipe length, D: pipe diameter, V: flow velocity, g: gravitational acceleration) Equation (1) holds, so that the diameters of the two heating pipes are D1 and D2, the lengths are L1 and L2, and the flow rates are V1 and V2, respectively. The condition for equalizing the pressure loss i of the pipe is equal to f L1 / D1 · V1 ² / 2g = f L2 / D2 · V2 ² / 2g · (Equation 2).

If both sides are eliminated and summed up in Equation 2, L1V1 ² = L2V2 ^{2 ...} (Equation 3).

On the other hand, since Q (flow rate) = A (cross-sectional area of piping)-V (flow rate) ... (Equation 4)

V1 = Q1 / A1 ... (Equation 5), and V2 = Q2 / A2 ... (Equation 6).

If (5) and (6) are substituted in (3), assuming that pipe diameters D1 and D2 are the same, the cross-sectional areas A1 and A2 of the pipe are the same, so L2 = L1 (Q1 / Q2). ² Equation 7 holds.

In the embodiment of the present invention, when heating water is supplied to the supply pipe at a pressure of ¹ kfg / cm ² , the maximum flow rate measured from the return side of the heating pipe 5 of 150M through the flow sensor 15a is 23pps (Pulse Per Second The maximum flow rate measured from the return side of the 80M heating pipe 6 through the flow sensor 16a was 32pps, and measured from the return side of the 50M heating pipe 7 through the flow sensor 17a. Maximum flow rate was 38 pps.

The length and flow rate of the heating pipe 5 are respectively L1 and Q1, the length and flow rate of the heating pipe 6 are respectively L2 and Q2, and the length and flow rate of the heating pipe 7 are respectively L3 and Q3. ,

If the ratio of the lengths of the heating pipes 5, 6, and 7 is calculated using the above equation (7), the estimated length of the heating pipe (6) is about 77.5M when the heating pipe (5) is 150M. The estimated length of the heating pipe 7 is about 55M.

It can be seen experimentally confirmed that the estimated length measured is equal to or extremely similar to the length of the actually disposed heating pipe. Therefore, it can be seen that the controller 25 can calculate the estimated length of the heating pipe length of each room by substituting the flow rate value measured in Equation (7).

More specifically, when the measured flow rate information is input to the controller 25, an integer is calculated by calculating (Q1 / Q2) as (Q1x128 / Q2) of (Equation 7) as an example for integer calculation. The ratio of the estimated length of the piping for heating can be obtained by constructing 255 squared calculation tables in the range of ≤ Q1 <2xQ2.

[Table 1] Operation Table

 INDEX  Piping length (M: calculation estimate) 0 ... 772 ... 92 ... 128 ... 128 0 ... 37 ... 52 ... 100 ... 100

From the square calculation table T1 representing the calculation result of the above formula (7), it can be seen that the ratio of the lengths of the heating pipes 5, 6, and 7 becomes 100: 52: 37, and the heating pipe Based on the flow rate Q1 (23pps) in (5), the target flow rates Q1max, Q2max, and Q3max are determined so that the flow rates flowing in the heating pipes 5, 6, and 7 are the same.

It is about 12pps because Q1max = 23pps, Q2max = 23pps52 / 100, and about 9pps because Q3max = 23pps37 / 100.

When the target flow rates Q1max, Q2max, and Q3max are converted into percentages, it can be seen that they are about 100%, 37%, and 23%, respectively.

Therefore, in order to make the same target flow rate per unit length flow in each heating pipe, the initial opening rate of the flow control valves of the heating pipes 6 and 7 is 37% and 23 respectively with respect to the maximum flow rate of the heating pipe 5. It can be seen that the flow rate of% should be controlled to flow.

On the other hand, in the embodiment of the present invention, the relationship between the flow rate ratio and the opening ratio of the flow control valve (15 A globe valve) was measured. As a result, the graph result of FIG. 3 was obtained.

Graph curve C1 of Fig. 3 measures the change in flow rate while changing the opening degree of the globe valve by installing a 15A globe valve at one end of an Excel pipe having a 150M length nominal diameter 15A and applying a pressure of ¹ kfg / cm ^{2 at} the other end.

Graph curve C2 measures the change in the flow rate while changing the opening degree of the globe valve by installing a 15A globe valve at one end of a 150M length nominal diameter 15A excel pipe and applying a pressure of 0.6 kfg / cm ^{2 at} the other end.

Graph curve C3 measures the change in flow rate while changing the opening degree of the globe valve by installing a 15A globe valve at one end of a 50M length nominal diameter 15A excel pipe and applying a pressure of ¹ kfg / cm ^{2 at} the other end.

Graph curve C4 measures the change in flow rate while changing the opening degree of the globe valve by installing a 15A globe valve at one end of a 50M length nominal diameter 15A Excel pipe and applying a pressure of 0.6 kfg / cm ^{2 at} the other end.

Table 2 shows the relationship between the flow rate ratio and the opening ratio of the flow control valve, based on the graph curve C, which is obtained by optimizing the pattern of the graph curves of C1, C2, C3, and C4.

[Table 2] Flow rate ratio to opening rate of flow control valve

 Flow rate ratio Qmax (%)  Opening rate of flow control valve (%) 0 0 · 23 · 23 · 37 · · 100 0 ... 12 12 ... 16 16

As can be seen from Table 2, the opening ratio of the flow regulating valve corresponding to the target flow rate ratio (Q1max is 100%, Q2max is 37%, Q3max is 23%) of the heating pipes 5, 6 and 7 is Since the controller 22 is 100%, 16%, and 12%, respectively, the controller 22 controls the initial opening rates of the flow control valves 15b, 16b, and 17b to 100%, 16%, and 12%, respectively.

After the initial opening rate of the flow control valve is automatically set as described above, the controller 25 calculates information transmitted from the room cones 20, 21, and 22 installed in each of the rooms 8, 9, and 10. The opening degree is adjusted again based on the initial opening rate of the flow control valves 15b, 16b, and 17b connected to the respective rooms.

For example, according to the difference between the actual temperature of a room and the set temperature of the room cone, the opening rate is compensated by a certain ratio based on the initial opening rate of the flow control valve of the room.

In the present invention, if the difference between the actual temperature of the room and the set temperature of the room cone is 6 degrees or more, the compensation ratio for the initial opening rate is 100%, less than 6 degrees and less than 4 degrees, 85%, less than 4 degrees, 70% if more than 2 degrees If it is less than 2 degrees, 50% compensation is made.

The compensation ratio may be configured by further subdividing according to the temperature difference, and the temperature compensation ratio is adjusted in real time according to the temperature setting and the measured temperature information input from the room cone of each room.

The control method of the heating system of the present invention configured as described above is to measure the flow rate by simultaneously opening the flow regulating valves of each room to the maximum, and calculating the ratio of the length of the heating pipe of each room using the measured flow rate. step.

Setting an initial opening degree of each flow control valve so that the same target flow rate per unit length flows in each heating pipe by using the ratio of the length of the heating pipe and the measured flow rate;

After the initial opening degree of each flow control valve is set, the initial opening degree of each set flow control valve is updated in real time according to temperature information received from the room cone of each room.

The driving method of the heating system of the present invention will be specifically described using the flowchart of FIG. 3.

First, when the user applies the power to the boiler 2 to drive (S10), the controller 25 determines whether the boiler is set to a heating mode (S11). If the boiler is not set to heating mode, the controller waits until the user sets heating mode. When the heating mode is set, the controller controls the flow control valves 15b, 16b, and 17b of each room to be opened to the maximum (S12), and uses the flow sensors 15a, 16a, and 17a to heat the piping for each room. (5) (6) (7) The maximum flow volume which flows through is measured (S13).

Using the measured maximum flow rate, the controller 25 calculates a ratio of the estimated length of the heating pipe of each room (S14), and uses the ratio of the estimated length of the heating pipe and the measured maximum flow rate to each heating pipe. The initial opening degree of the flow regulating valves 15b, 16b, 17b of each room is set (S15) so that the same target flow volume per unit length can flow.

After the initial opening degree is set, it is determined whether temperature difference compensation is to be performed in each room according to the temperature information of each room input through the room cones 20, 21 and 22 installed in each room (S16), and the temperature difference compensation is executed. If the opening is adjusted based on the initial opening of the flow control valve in each room, the opening can be adjusted according to the temperature difference compensation, for example, if the temperature difference between the room temperature and the room where the room is installed is 6 degrees or more, Compensation rate for the rate is 100%, less than 6 degrees and more than 4 degrees 85%, less than 4 degrees and less than 2 degrees 70%, less than 2 degrees 50% of the compensation is made (S17).

If the differential compensation is not performed, the opening degree of the flow regulating valve is maintained until the differential compensation information is input to the controller.

The present invention is not limited to the technical details shown in the embodiments and the drawings, and various modifications can be made without departing from the contents and objects described in the claims of the present invention.

The heating system of the present invention uses the flow rate measured by each flow sensor 15a, 16a, 17a in a state in which each flow control valve 15b, 16b, 17b is fully opened. Calculate the ratio of the length, and set the initial opening degree of the flow regulating valve of each room to supply the same target flow rate per unit length of the pipe in each room according to the calculated ratio of the pipe length, After the initial opening degree is set, the initial opening degree of the set flow regulating valve is updated in real time according to the difference between the set temperature received from the room cone of each room and the room temperature of the room, and thus regardless of the area or position of the room. The heating conditions of all the rooms can be controlled uniformly, and the effect of reducing the variation of the heating time according to the temperature conditions of each room can be obtained.

Claims (4)

A plurality of heating pipes connected in parallel between the boiler, the return pipe and the supply pipe connected to the boiler, and the return pipe and the supply pipe having the same diameter, and installed at one end of the plurality of heating pipes, respectively. A flow controller comprising a flow control valve and a flow sensor, a room cone installed in a room partitioned by the excretion of the plurality of heating pipe lengths, for setting the temperature of the room and for measuring the temperature; In the heating system having a controller for adjusting the opening degree of each flow control valve, The controller calculates a ratio of pipe lengths of the respective rooms by using the flow rate measured by each flow sensor in a state in which the respective flow control valves are opened to the maximum, and for each room according to the calculated ratio of pipe lengths. And an initial opening of the flow regulating valve of each room so that the same flow rate is supplied per unit length of the pipe. The method of claim 1, The controller may be configured to update the initial opening degree of the set flow control valve in real time according to the difference between the set temperature received from the room cone of each room and the room temperature of the room after the initial opening degree of the flow control valve of each room is set. Heating system, characterized in that configured. The method according to claim 1 or 2, The heating system is characterized in that the heating system is arranged to have a length proportional to the area of the room. A plurality of heating pipes connected in parallel between the boiler, the return-side pipe and the supply-side pipe connected to the boiler, the return-side pipe and the supply-side pipe, a flow control valve respectively installed at one end of the plurality of the heating pipes; A flow controller comprising a flow sensor, a room cone installed in each room partitioned by the excretion of the plurality of heating pipe lengths, for setting temperature and measuring the temperature of the room, and the respective flow control valves according to the signals of the room cones. In the heating system having a controller for adjusting the opening degree of, Simultaneously measuring the flow rate by simultaneously opening the flow rate control valves of each room to the maximum, and calculating a ratio of the length of the heating pipe of each room using the measured flow rate. Setting an initial opening degree of each flow control valve so that the same target flow rate per unit length flows in each heating pipe by using the ratio of the length of the heating pipe and the measured flow rate; And after the initial opening degree of each flow control valve is set, the initial opening degree of each set flow control valve is updated in real time according to temperature information received from the room cone of each room.

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