KR100936162B1 - Air-conditioning discharge control system and discharge control method - Google Patents

Abstract

PURPOSE: An air-conditioning discharge control system using a temperature difference is provided to enable discharge control corresponding to each household by maintaining constant temperature difference even though the feed-water temperature changes according to season. CONSTITUTION: An air-conditioning discharge control system using a temperature difference comprises supply pipes(1), return pipes(3), feed-water temperature sensors(10), return-water temperature sensors(20), flow regulating valves(30), and control units(40). The supply pipes transfer hot water provided from a heating source to loads. The return pipes are connected to the respective loads and joined in order to return the hot water to the heating source. The feed-water temperature sensors are installed in the supply pipes in order to sense the temperature of the hot water provided to the loads. The return-water temperature sensors are installed in the return pipes in order to sense the temperature of the hot water returned from the load sides. The flow regulating valves are installed in the return pipes in order to control the flow rate of the returned hot water. The control units compare the difference detected the temperatures sensed by the feed-water temperature sensors and the return-water temperature sensors with the inputted set value, and regulate the flow regulating valves.

Description

Cold using temperature difference. Air-conditioning Discharge Control System and Discharge Control Method

The present invention is cold. The present invention relates to a heating flow control system, and more particularly, to a central supply cooling system using a central heating and district heating system, a fan coil unit, etc. to maintain a constant temperature difference by generation (each room). The flow rate can be kept constant, and control can be made to supply only the proper flow rate according to the load required by each generation, thereby preventing the imbalance of flow rate between each generation (each room), and when the load decreases in proportion to the temperature difference By reducing the flow rate, it is possible to minimize the power consumption of the machine room cold and hot water circulation pumps, and to miniaturize the power equipment, thereby reducing the installation cost and maintenance cost, and adjusting the flow rate in proportion to the temperature difference. It can be used for heating and the room temperature can be set in the room temperature controller to control the air temperature. It is possible to control the flow rate according to the load for each generation by maintaining a constant temperature difference even if the temperature of the cold / heating supply water changes seasonally, and makes the best use of the heat source transmitted through water, which is a heat transportation medium. Cooling using temperature difference, which increases efficiency and reduces maintenance costs such as heat source transportation power cost, cooling, heating cost, and operating cost. A heating flow control system.

In general, various air-conditioning methods have been researched and developed to maintain a comfortable indoor environment of indoor spaces due to improved living standards and a comfortable environment according to the living standards and isolation from polluted outdoor areas.

The most important of them is the cooling and heating method.

Here, in the cooling and heating method, the cooling and heating method using hot water or cold water maintains the indoor air in a comfortable state and is advantageous in controlling room temperature to a desired temperature by a room patient. Cooling systems using cold water such as fan coil units are used for cooling.

Therefore, by controlling the amount of hot water or cold water to maintain the amount of cold water or hot water in accordance with the fluctuations of the indoor load, the room temperature is constant, and the unnecessary flow rate can be controlled to prevent waste of energy, which has been studied for a long time.

The current hot water supply system is district heating, individual heating, or central heating. The hot water dispenser distributes and distributes hot water to each room in an apartment or a general house. The heating water is supplied to the coils of each room. The floor or indoor air is heated by heat exchange while circulating the hot water coil.

In the case of such hot water heating, the return temperature of the supply water for heating is different according to the size of each household (each room) area or the conditions of the external environment, and the supply flow rate of the supply water is the size of the three heating areas and the required heating load. Different heating is difficult and uniform heating is difficult in some households, and heating of each household does not reach almost the same time with the same constant temperature. This causes unnecessary energy waste and complaints due to poor heating.

This is because the existing constant flow control system controls the flow rate in a manner that maintains only a constant flow rate regardless of temperature or heating load.

To compensate for this, initially set a fixed flow rate value and supply the flow rate in proportion to the heating area of each household, and once heating starts, read the temperature difference between the supply temperature and the return temperature to maintain the constant temperature difference. Energy saving and cooling by flow control according to load and load. It is invented to achieve the purpose, such as reducing the heating cost.

The present invention has been made to solve the above problems,

It is used for central heating and district heating as well as central supply cooling system using fan coil unit, so that the temperature difference can be kept constant by generation, and the flow rate can be kept constant. It can be controlled to supply only the flow rate to prevent the imbalance of the flow rate between each generation, it is possible to adjust the unnecessary cold, hot water supply flow rate. Accordingly, the power consumption of the cold and hot water circulation pumps can be minimized, and the power equipment can be miniaturized. The purpose is to provide a heating flow control system.

In addition, the present invention is supplied cold. It is a system that adjusts the flow rate in proportion to the hot water temperature difference, which can be used for cooling and heating. Another object is to provide a heating flow control system.

In addition, the present invention is capable of controlling the flow rate corresponding to the load for each generation by maintaining a constant temperature difference even when the temperature of the seasonal cold, heating supply water is different, it is possible to make full use of the heat transferred through the water as a heat transport medium The transportation efficiency is increased, and thus the cooling using the temperature difference, which reduces the heat source transportation power cost and cooling, heating cost, and operating cost. Another object is to provide a heating flow control system.

In order to achieve the above object, the present invention is district heating and central cooling. Cold applied to heating. In the heating control system,

A supply water temperature sensor installed in the supply pipe to detect a temperature T₁ of the heating water supplied to the load side;

A return temperature sensor installed in the return pipe to detect a temperature (T2) of the heating water returned from the load side;

A flow rate control valve installed in the return pipe and controlling a flow rate of the heated water returned;

A control unit for controlling the flow regulating valve by comparing the temperature difference ΔT between the temperature T₁ sensed by the feed water temperature sensor and the temperature T₂ sensed by the return temperature sensor with the input set value δT. Cold using a temperature difference, characterized in that configured to include. A heating flow control system.

As discussed above, cold using the temperature difference of the present invention. The heating flow control system is designed to solve the problems of the conventional system such as the constant flow control valve by the physical force (spring, diaphragm elasticity),

Used in the case of central heating and district heating as well as central supply cooling using fan coil unit, it is possible to keep the flow rate constant by keeping the temperature difference constant for each generation, and according to the load required by each generation It can be controlled to supply only the flow rate to prevent the imbalance of the flow rate between each generation, it is possible to adjust the unnecessary cold, hot water supply flow rate. Accordingly, the power consumption of the cold and hot water circulation pumps of the machine room can be minimized, and the power equipment can be miniaturized, thereby reducing the installation cost and maintenance cost.

In addition, the present invention is supplied cold. As a system for adjusting the flow rate in proportion to the hot water temperature difference, it can be used for cooling and heating, and the room temperature can be set in the temperature controller to control the indoor air temperature.

In addition, the present invention is capable of controlling the flow rate corresponding to the load for each generation by maintaining a constant temperature difference even when the temperature of the seasonal cold, heating supply water is different, it is possible to make full use of the heat transferred through the water as a heat transport medium The transport efficiency is increased, thereby reducing the heat source transportation power costs and cooling, heating costs, operating costs.

The present invention has the following features to achieve the above object.

The present invention is district heating and central cooling. Cold applied to heating. In the heating flow control system,

A supply water temperature sensor installed in the supply pipe to detect a temperature T₁ of the heating water supplied to the load side;

A return temperature sensor installed in the return pipe to detect a temperature (T2) of the heating water returned from the load side;

A flow rate control valve installed in the return pipe and controlling a flow rate of the heated water returned;

A control unit for controlling the flow regulating valve by comparing the temperature difference ΔT between the temperature T₁ sensed by the feed water temperature sensor and the temperature T₂ sensed by the return temperature sensor with the input set value δT. Characterized in that it comprises a.

In addition, the present invention is district heating and central heating or central supply cooling. In the heating flow rate control method,

To control the opening of the constant flow control valve, which is installed to prevent cold and heating imbalance due to the generational flow variation, the temperature difference between the cooling and heating water supply and return without depending on the spring or the physical change of the diaphragm. ), And the constant temperature is maintained by maintaining the temperature difference ΔT at the set value δT.

The present invention having such a feature will be more clearly described through the preferred embodiment accordingly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is cold using a temperature difference according to an embodiment of the present invention. Figure 2 is a schematic diagram showing a heating flow control system, Figure 2 is cold using the temperature difference according to an embodiment of the present invention. 3 is a cross-sectional view showing a flow control valve used in the heating flow control system, Figure 3 is a graph showing the district heating proportional control according to an embodiment of the present invention, Figure 4 is a fan coil unit according to an embodiment of the present invention A graph showing cold water proportional control.

As shown in FIG. 1, cold using the temperature difference of this invention. The heating flow control system controls the opening of the constant flow regulating valve, which is installed to prevent cooling and heating imbalance due to generational flow variation in district heating and central heating, or centrally supplied cooling system. It is a system that maintains constant flow rate by reading the temperature difference between cold, heating supply water and return water without relying on physical change (elasticity). It is transferred to the heating water distribution pipe (2), the heating water distribution pipe (2) is branched to supply the heating water to each load side (heating zone, indoor space, fan coil), at each load side 70 The used heating water (return) is integrated into one return pipe (3) and returned to the machine room.

Here, the supply pipe 1 is provided with a supply water temperature sensor 10 to detect the temperature (T₁) of the heating water supplied to the load side 70, the temperature detected by the supply water temperature sensor 10 is a control unit Signal is sent to (CPU).

In addition, the one return pipe (3) is provided with a return temperature sensor 20 to detect the temperature (T₂) of the heating water returned from the load side 70, the temperature detected by the return temperature sensor 20 The signal is transmitted to the control unit 40. And the return pipe 3 between the load side 70 and the return temperature sensor 20 is provided with a flow control valve (constant flow valve) 30 to adjust the flow rate of the heating water is returned.

Thus, the control unit 40 sets the temperature difference ΔT between the temperature T₁ detected by the feed water temperature sensor 10 and the temperature T₂ detected by the return water temperature sensor 20 by a user. The flow rate control valve 30 is adjusted in comparison with the value δT. In addition, the control unit 40 controls the flow control valve 30 by a signal sent from a temperature controller (RT: Room Thermostat) installed on the load side (indoor). At this time, control by room temperature (air temperature) stops heating (cooling) by turning valve on and off when room temperature reaches set temperature. In case of cooling or cooling, the fan speed of the coil unit is controlled to high, medium and low.

The flow regulating valve 30 is further provided with a stepping motor 31, which is configured as a general globe valve and connected to a disk 32 that opens and closes to function as a constant flow valve, with reference to FIG. 2.

Here, the stepping motor controls the internal disk 32 for each set step according to the temperature difference DELTA T of the heating water. Hereinafter, the opening / closing unit for each step will be described according to the heating method. .)

At this time, the stepping motor 31 opens the disk 32 by 1 step if the setting value δT of the control unit 40 is greater than the setting value δT according to the value of the temperature difference ΔT in a proportional control manner. When the temperature is lower than the set value δT, the disk 32 is closed to always maintain the set value δT.

Here, 1 step according to the temperature is set through the following first equation.

[Formula 1]

ΔT: Maximum flow rate of the applied valve in the heating or cooling system (LPM)

step: Set interval of stepping motor (50 ~ 100 parts)

Hereinafter, cold using the temperature difference described above. With reference to the heating flow control system, the control method according to the heating method will be described in detail.

First, the maximum indoor load is determined at the time of design, whether it is cooling or heating, and all air conditioning equipment is selected and installed according to the heat load of the load, so the maximum load is maintained at the initial designed value (design flow value can be input from the thermostat). . Thus, the flow rate supplied for each household can be limited to within the flow rate at maximum load.

Here, in the district heating facility or the cooling facility using the fan coil unit, when the flow rate is controlled by applying the temperature difference proportional control method, the change in the flow rate according to the temperature difference is shown in the graphs of FIGS. 3 and 4. Can be expected.

Either way, the temperature range used is different, but the control method is the same, so that the change in flow rate until the temperature difference is reached, the flow rate change when the temperature difference is reached, and the subsequent flow rate change occur as shown in the graph.

The characteristic of this control method is that when the temperature difference is reached, the temperature difference thereafter remains almost constant because the flow rate value is adjusted according to the indoor load by proportional control. In other words, if the indoor load (cooling or heating load) becomes large (temperature difference becomes larger than the set temperature difference), the flow rate increases, and if the indoor load decreases (temperature difference becomes smaller than the set temperature difference), the flow rate decreases. As the change occurs, the temperature difference can be maintained almost constant.

For this reason, when cooling and heating water is supplied to a plurality of generations at the same time, when the cooling and heating are stopped for some generations, the temperature difference becomes small due to the increase in flow rate, and in this case, the flow rate is inevitably accompanied to maintain a constant temperature difference. This makes it possible to achieve the purpose of energy saving.

In addition, due to this it is possible to maintain a constant room temperature and unnecessary energy saving, thereby avoiding the heating.

District heating and central heating

Referring to FIG. 3, first, the temperature difference ΔT is controlled in units of 1 ° C. based on 15 ° C. (temperature difference ΔT calculation = supply temperature − return temperature), and the control unit 40 includes a supply temperature T ′ and The temperature difference (△ T) is calculated by the temperature value transmitted from the return temperature (T₂) sensor, and the value of the calculated temperature difference (△ T) is compared with the value of the temperature difference (δT) set through the temperature controller (RT). If the value is large, the disk 32 of the flow regulating valve 30 is opened, and if the value is small, the disk 32 of the flow regulating valve 30 should be proportional to the closing direction.

Flow rate setting value according to temperature difference (change when temperature difference is set to 15) Temperature difference 25 24 23 22 21 20 19 18 17 16 15 15 15 15 15 15 15 15 flux 3 3 3 3 3 3 3 3 2.9 2.8 2.7 2.6 2.5 2.6 2.7 2.6 2.5 2.5

* Initial flow rate (3) is to set the flow rate value at maximum load in the temperature controller.

1) Step division and initial flow rate setting

The opening degree of the valve 30 is set to a value step immediately above the approximate value when the flow rate value is input from the temperature controller 60 by dividing the opening degree of the flow control valve 30 into 100 steps (1 step = 0.1 to 1 LPM).

Here, the opening degree setting value should not exceed any case, and the temperature difference can be read and adjusted in a direction smaller than the opening degree setting value. In this case, when the opening degree is smaller than the set value, when the value of the temperature difference is larger than the set value, when the value of the temperature difference is greater than the set value, the opening may be proportionally adjusted and opened up to the maximum initial setting value.

2) On-Off of Flow Control Valve

At the set temperature (indoor air temperature) of the temperature controller 60, the valve 30 is completely closed, and when -1 ° C. becomes lower than the set temperature, the valve 30 is opened to supply heating water. At this time, the opening degree of the valve 30 is made into the initially set maximum value.

3) Flow control at set temperature difference (supply and return temperature difference)

The opening and closing of the opening of the valve 30 at the set value (δT) takes a proportional control method according to the value of the temperature difference (ΔT). When the valve 30 is larger than the set value (δT), the valve 30 is opened by 1 step and the set value (δT). If it is smaller than), it closes, and the interval is made constant.

Here, the adjustment of the opening degree of the valve 30 closes the valve 30 at a predetermined interval from a set value δT of + 3 ° C. When the flow rate decreases after a certain time and the value of the temperature difference ΔT reaches the set value δT, the valve 30 maintains the state. -1 ℃) If it gets smaller, it opens by 1 step, and the interval is also kept constant.

In this way, the valve 30 is repeatedly operated so that the value of a predetermined temperature difference is always maintained.

In addition, when the valve 30 is closed to reduce the flow rate because the temperature difference ΔT becomes smaller than the set value δT, the maximum width is closed only to 50-60% of the initial flow rate value. There is concern.)

<Fan coil unit>

Referring to FIG. 4, the temperature difference ΔT is controlled by 0.5 ° C. based on 5 ° C. (cooling) as a reference (temperature difference ΔT calculation = supply temperature-return temperature), and the control unit CPU supplies a supply temperature T₁. And a temperature difference ΔT based on the temperature value transmitted from the return temperature T₂ sensor, and compares the value of the calculated temperature difference ΔT with the temperature difference δT set through the temperature controller RT. If the value is large, the disk 32 of the flow regulating valve 30 is opened, and if the value is small, the disk 32 of the flow regulating valve 30 must be proportional to the closing direction.

Flow rate setting value according to temperature difference Temperature difference 9 8.5 8 7.5 7 6.5 6 5.5 5 5 5 5 5 5 5 5 5 5 flux 10 10 9.7 9.4 9.1 8.8 8.5 8.2 7.9 7.9 7.9 8.2 7.9 8.2 7.9 7.6 7.9 8.2

* The initial flow rate is the flow rate value at the maximum load set in the temperature controller.

1) Step division and initial flow rate setting

The opening degree of the valve 30 is set to a value step immediately above the approximate value when the flow rate value is input at the temperature controller 60 by dividing the opening degree of the flow control valve 30 into 100 steps (1 step = 0.3 lpm).

Here, the opening degree setting value should not exceed any case, and the temperature difference can be read and adjusted in a direction smaller than the opening degree setting value. In this case, when the opening degree is smaller than the set value, when the value is increased to the initial value, when the value of the temperature difference is larger than the set value, it may be proportionally adjusted to be opened step by step and may be opened up to the maximum initial set value.

2) On-Off of Flow Control Valve

At the set temperature (indoor air temperature) of the temperature controller 60, the valve 30 is completely closed, and when + 1 ° C. becomes higher than the set temperature, the valve 30 is opened to supply cooling water. At this time, the opening degree of the valve 30 is made into the initially set maximum value.

3) Flow control at set temperature difference (supply and return temperature difference)

The opening and closing of the opening of the valve 30 at the set value (δT) takes a proportional control method according to the value of the temperature difference (ΔT). When the valve 30 is larger than the set value (δT), the valve 30 is opened by 1 step and the set value (δT). If it is smaller than), it closes, and the interval is made constant.

Here, the adjustment of the opening degree of the valve 30 maintains the set value δT and opens the valve 30 at regular intervals from + 3 ° C. of the set value. When the flow rate increases after a certain time, and the value of the temperature difference ΔT reaches the set value δT, the valve 30 maintains the state, and after the time elapses, the temperature is within the set value δT ( -1 ℃) If it gets smaller, close by 1 step, and make the interval constant.

In this way, the valve 30 is repeatedly operated so that the value of a predetermined temperature difference is always maintained.

In addition, when the valve 30 is closed to reduce the flow rate because the temperature difference ΔT becomes smaller than the set value δT, the maximum width is closed only to 50-60% of the initial flow rate value. There is concern.)

1 is cold using a temperature difference according to an embodiment of the present invention. Schematic diagram showing a heating flow control system,

2 is cold using a temperature difference according to an embodiment of the present invention. Is a cross-sectional view showing a flow control valve used in the heating flow control system,

3 is a graph showing the district heating proportional control according to an embodiment of the present invention,

4 is a graph illustrating a fan coil unit cold water proportional control according to an embodiment of the present invention.

<Indication of symbols for main parts of drawing>

10: supply water temperature sensor 20: return temperature sensor

30: flow control valve 40: control unit

60: temperature controller 70: load side

Claims (5)

Cooling applied to district heating and central heating. In the heating flow control system, A supply pipe 1 for transferring the heating water supplied from the heat source side to the load side 70; A return pipe (3) connected to the load side (70) and integrated into one to return the heating water to the heat source; A supply water temperature sensor 10 installed in the supply pipe 1 to detect a temperature T 온도 of the heating water supplied to the load side 70; A return temperature sensor 20 installed in the return pipe 3 to detect the temperature T₂ of the heating water returned from the load side 70; A flow rate control valve 30 installed in the return pipe 3 to adjust a flow rate of the heated water returned; The temperature difference ΔT between the temperature T 온도 sensed by the feed water temperature sensor 10 and the temperature T₂ sensed by the return temperature sensor 20 is compared with the input set value δT to adjust the flow rate control valve ( 30, the control unit 40 for controlling the configuration, including; The flow control valve 30 is cold using the temperature difference, characterized in that the stepping motor 31 is further installed to open and close the inner disk 32 by a set step (step) according to the temperature difference (△ T) of the heating water. . Heating flow control system. The method of claim 1, The stepping motor 31 opens the disk 32 when the stepping motor 31 is higher than the setting value δT according to the value of the temperature difference ΔT in proportion to the setting value δT of the control unit 40 and the setting value δT. When the temperature is lower than), it closes and maintains the set value (δT) at all times. Heating flow control system. The method of claim 1, The temperature difference ΔT is 5 to 15 ° C. according to the heating method, and the set step of the step motor 31 is divided into 100 steps to set 1 step according to the temperature according to the first equation. . [Formula 1]

Where ΔT is the temperature difference between T₁ and T₂ and step is the set interval of the stem motor. delete delete

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