JPS63161340A - Controller for cooling and heating system - Google Patents

Abstract

PURPOSE:To control a water temperature under a positive and rapid operation by a method wherein the number of rotation of a pump is controlled in such a way that an outlet temperature is kept constant when the outlet temperature is within a desired range and in turn an inlet temperature is out of the range, a flow rate control valve is controlled to open in such a way that it is in a range even in case of a starting of cooling or heating operation. CONSTITUTION:In case that a temperature of water 11 within a thermal accumulation tank 8 is more than 20 deg.C when a cooling operation is started, this temperature is detected by an inlet temperature sensor 17 and an electrical two way valve 14 is proportionally controlled in response to the inlet temperature for its degree of opening under operation of a controller 15. Cold water fed out of a cooling and heating unit 1 is branched from a main pipe 10 and a bypass pipe 13 into a starting tank portion 8a and a terminal end tank portion 8b. At the terminal end tank portion 8b, the cold water is mixed with hot water and the inlet temperature is controlled to a value less tan 20 deg.C which is in a desired range. In case of a value less than 20 deg.C, the electrical two-way valve 14 is closed and a water temperature at the outlet portion of the cooling and heating unit 1 is detected by the outlet temperature sensor 6, a control signal is outputted from a controller 13 to an inverter 16 so as to control the number of rotation of a pump 3 and the outlet temperature is kept constant.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a heating and cooling system, and particularly to a control device for controlling the temperature of water (cold water or hot water) used as a cooling medium or a heat medium in a heating and cooling system. The invention relates to a device.

[Prior Art] Fig. 3 is a piping system diagram showing a conventional control device for a heating and cooling system. , 3A is a cold and hot water pump, 4 is a motor that drives the cold and hot water pump 3A, 5 is an electric three-way valve, 5a is a motor that drives this electric three-way valve 5, and 6 is a water temperature at the outlet side of the cooler/heater 1. 7 is a controller for controlling the motor 5a based on the outlet temperature detected by the outlet temperature sensor 6 to open and close the electric valve 5; 8 is composed of a plurality of tank parts; A heat storage tank capable of storing cold water or hot water in each tank part, 8a and 8b are a starting tank part and a terminal tank part located at both ends of the heat storage tank 8, respectively, 9 is a partition plate inside the heat storage tank 8, 10° 10a is a heat storage tank This is a main pipe (water pipe) that connects the starting tank part 8a and the terminal tank part 8b in the tank 8.

A cooling/heating device 1 is installed in the main pipe 10, an electric three-way valve 5 is installed in the main pipe 10a, and a hot and cold water pump 3A is installed between the main pipes 10 and 10a. It has been intervened. Note that the main pipe 10 is arranged on the starting tank portion 8a side, and the main pipe 10a is arranged on the terminal tank portion 8b side.

Moreover, 10b is a bypass pipe (water pipe) connecting the starting end tank portion 8a in the heat storage tank 8 and the electric three-way valve 5.

11 is water, and 12 is an arrow indicating the flow of water 11 within the heat storage tank 8.

Next, the operation will be explained. By driving the cold/hot water pump 3A with the motor 4, the water 11 in the heat storage tank 8 is transferred to the terminal tank portion 8b and the main pipe 10a.

10, and the heat storage tank 8. It circulates along the main pipes 10a and 10.

At this time, the pumped water 11 flows into the cooler/heater 1, and in the cooler/heater 1, it is cooled into cold water in the summer (when the temperature is high, that is, when cooling is performed), and becomes cold water in the winter (when the temperature is high). When the temperature is low (that is, when heating is performed), the water is heated and sent out as hot water.

The cold water or hot water from the cooler/heater 1 flows into the heat storage tank 8 again through the main pipe 10, and moves through n tank sections partitioned by partition plates 9 in the heat storage tank 8. When the entire water 11 in the heat storage tank 8 finally reaches the target temperature, heat storage ends.

This temperature control means will be explained in detail in the case of cooling water in the summer (during air conditioning). At the start of operation in the summer, the temperature of the water 11 in the heat storage tank 8 is high, so the water pumped by the cold/hot water pump 3A is 11 is cooled by the cooler/heater 1, and the cold water cooled and discharged from the cooler/heater 1 flows into the starting end tank portion 8a of the heat storage tank 8.

A part of the cold water that has flowed in moves within the heat storage tank 8 as shown by the arrow 12, while the remaining part passes from the starting end tank part 8a through the bypass piping 10b and reaches the electric three-way valve 5. At the three-way valve 5, it is mixed with the water 11 in the heat storage tank 8 pumped up from the main pipe 10a, and is cooled again.
It flows into the heater 1.

At this time, in order to keep the temperature of the cold water flowing out from the cooler/heater 1 constant, the water temperature is detected by the outlet temperature sensor 6, and the motor 5a is controlled by the controller 7 based on the detected outlet temperature. The opening degree of the valve 5 is adjusted. As a result, water (cold water) from the starting end tank portion 8a,
Water (relatively warm water) from the terminal tank portion 8b is mixed appropriately to keep the temperature of the water supplied to the cooler/heater 1 constant.

The device continues to be operated in this state for a while, and when the cold water diffuses into the heat storage tank 8 and the entire water 11 in the heat storage tank 8 reaches a predetermined temperature, heat storage ends.

[Problems to be Solved by the Invention] The conventional control device for a heating and cooling system is configured as described above, but the outlet temperature sensor 6 detects the water temperature at the outlet side of the cooler/heater 1, and Even if you control the opening and closing of the electric three-way valve 5 based on the detected value, the operation of the electric three-way valve 5 is extremely slow, so especially when cooling or heating starts, if there is a large difference between the water temperature at that time and the predetermined water temperature, cooling or heating will be delayed.
There was a problem in that the water temperature at the outlet side of the heater 1 was hunting, and the water temperature could not be made constant reliably and quickly.

This invention was made to solve the above-mentioned problems, and even when cooling or heating is started, the temperature flowing out from the cooling/heating device is reliably and quickly cooled or heated, and the temperature of the water is reduced. The purpose of this invention is to obtain a control device for a heating and cooling system that can be controlled constantly.

[Means for solving problems] A control device for a heating and cooling system according to the present invention is a control device for a heating and cooling system.

A main pipe that connects the starting tank and the terminal tank located at both ends of the heat storage tank, a bypass pipe that branches from the main pipe and communicates with the terminal tank, and a cooling/heating system installed in the main pipe. an inlet temperature sensor that includes a variable speed pump, a variable speed pump, and a flow control valve installed in the bypass piping, and detects the water temperature at the inlet side and outlet side of the cooling/heating device in the main piping, respectively; and an outlet temperature sensor, and a control means, which controls the flow rate control valve to close when the outlet temperature detected by the outlet temperature sensor is within a predetermined range. The number of revolutions of the pump is controlled to keep the outlet temperature constant, and when the inlet temperature is outside the range, the flow rate control valve is controlled to open so that the inlet temperature is within the range. It is.

[Function] In the heating and cooling system control device of the present invention, the inlet temperature sensor and the outlet temperature sensor detect the water temperatures at the inlet side and the outlet side of the cooler/heater, respectively, and the detected inlet temperature falls within a predetermined range. If it is within
While the flow rate control valve remains closed, the rotation speed of the variable speed pump is controlled by the control means, and while the water temperature at the outlet side of the cooling/heating device is kept constant, the inlet temperature is outside the above range. When the flow rate control valve is controlled to be open by the control means, the inlet temperature is controlled to be within the range.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. 1st
Fig. 2 is a piping system diagram showing a control device for an air conditioning system according to an embodiment of the present invention; Fig. 2 is a graph showing the temperature characteristics during cooling in summer for explaining the operation of this device; In the figure, the same reference numerals as those shown in FIG. 3 indicate the same parts, so a description thereof will be omitted.

In FIG. 1, 3 is a variable speed pump (cold/hot water pump) interposed between the main pipes 1o and loa, and 13 is a terminal branched from the outlet side of the cooling/heating device 1 of the main pipe 10. Bypass piping communicating with the tank portion 8b; reference numeral 14 denotes an electric two-way valve as a flow rate control valve installed in the bypass piping 13;
14a is a motor for adjusting the opening degree of this electric two-way valve 14, 15 is a controller as a control means, and 16 is a controller that drives and controls the motor 4 based on a control signal from the controller 16 to control the rotation speed of the pump 3. inverter to control,
Reference numeral 17 denotes an inlet temperature sensor that detects the water temperature of the main pipe 108, that is, the inlet side portion of the cooler/heater 1.

Here, the controller 16 includes an inlet temperature sensor 17
When the inlet temperature detected by the inlet temperature is within a predetermined range, the rotation speed of the pump 3 is controlled by the inverter 16 with the electric two-way valve 14 closed, so that the outlet temperature detected by the outlet temperature sensor 6 is kept constant. On the other hand, when the inlet temperature is outside a predetermined range, a control signal is output to the motor 14a to control the opening of the electric two-way valve 14, thereby controlling the inlet temperature within a predetermined range. It is.

Next, according to Figures 1 and 2, when cooling water in the summer (
The operation during cooling is explained below.

It is impossible to set an infinite temperature difference between the entrance and exit of the heat exchanger 2 in the cooling/heating device 1. For example, due to the performance of the heat exchanger 2, in this embodiment, The temperature difference Δt is 2.5 to 15°C, as shown in Figure 2.
(However, if the outside air temperature is constant and the cold water temperature is kept at 5℃)
When the temperature difference Δt is within this range, the electric two-way valve 14 is kept closed, and when Δt exceeds 20°C, the electric two-way valve 14 is driven by the motor 14a. to control opening.

In other words, in this embodiment, the outlet water temperature of the cooler/heater 1 is set to 5
When controlling to keep the temperature constant at ℃, the limit for the inlet water temperature of the cooler/heater 1 is 20℃.If this temperature is exceeded, the outlet temperature of the cooler/heater 1 cannot be kept constant just by controlling the rotation speed of the pump 3. Temperature control will be carried out assuming that this is not possible. For example, when the inlet water temperature is 300C, there is a temperature difference of 15C or more from the predetermined outlet water temperature of 5C, and the outlet side water temperature is 15C, so it is necessary to supply cold water at 5C to the heat storage tank 8. become unable to do so.

Therefore, in this embodiment, if the temperature of the water 11 in the heat storage tank 8 is 20° C. or higher (that is, outside the predetermined range) at the start of cooling of the air conditioner, this temperature is detected by the inlet temperature sensor 17. The controller 15 proportionally controls the opening degree of the electric two-way valve 14 according to the inlet temperature.

As a result, the cold water flowing out from the cooling/heating device 1 is divided into the starting tank part 8a and the terminal tank part 8b by the main pipe 10 and the bypass pipe 13, and in the terminal tank part 8b, the cold water is mixed with high temperature water. The inlet temperature is controlled within a predetermined range of 20°C.

According to this embodiment, in this way, even when the air conditioner starts cooling, the water temperature at the inlet side of the cooler/heater 1 is immediately brought down to 20°C or less, and after that, the rotation speed of the pump 3 is controlled. By doing this, the predetermined temperature (5
℃) can be supplied from the cooler/heater 1 to the heat storage tank 8.

Note that the temperature detected by the inlet temperature sensor 17 is 20
℃ or below (within a predetermined range), or if the cooling capacity of the cooler/heater 1 changes due to external factors,
With the electric two-way valve 14 closed, the outlet temperature sensor 6 detects the water temperature at the outlet side of the cooler/heater 1, and the controller 15 outputs a control signal to the inverter 16 to control the rotation speed of the pump 3. By doing this, as before,
The outlet temperature is kept constant (5° C. in this example).

Furthermore, in the above example, the outlet temperature was kept constant at 5°C;
The outlet temperature can be set arbitrarily, and an electric two-way valve 14 is used as the flow rate control valve, but an electromagnetic solenoid valve may be used as long as the opening degree is not proportionally controlled. However, in this case, the main pipe 10 and the bypass pipe 1
3. Select the optimal size.

Further, in the above embodiments, only cooling during air conditioning is explained, but the device of the present invention can be applied to heating during heating in exactly the same way, and the same effects as described above can be obtained. At this time, the predetermined range is.

The minimum water temperature of the outlet side temperature is set, and the inlet temperature sensor 17
When the detected inlet temperature becomes equal to or lower than this minimum water temperature, the electric two-way valve 14 is controlled to open.

[Effects of the Invention] As described above, according to the present invention, the rotation speed of the variable rotation speed pump is controlled by the control means to keep the water temperature at the outlet side of the cooling/heating device constant, and the cooling - If the water temperature (inlet temperature) at the inlet side of the heater falls outside the predetermined range, the control means controls the opening of the flow control valve in the bypass piping so that the inlet temperature falls within the above range. With this configuration, even when cooling or heating is started, the temperature flowing out from the cooler/heater is reliably and quickly cooled or heated, and the water temperature can be controlled to be constant.

[Brief explanation of the drawing]

Figures 1 and 2 show a control system for a heating and cooling system as an embodiment of the present invention, and Figure 1 is a piping system diagram thereof;
FIG. 2 is a graph showing the temperature characteristics during cooling in summer, which is used to explain the operation of the present device, and FIG. 3 is a piping system diagram showing a conventional control device for a heating and cooling system. In the figure, 1--cooling/heating device, 3--variable rotation speed pump, 6--outlet temperature sensor, 8--thermal storage tank, 8a
--- Starting end tank part, 8b--- Ending tank part, 10, 10
a...-main piping, 13--bypass piping, 14--electric two-way valve as flow control valve, 15--controller as control means, 17--inlet temperature sensor. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A heat storage tank that consists of multiple tank parts and can store cold water or hot water in each of these tank parts, a main pipe that connects a starting tank part and a terminal tank part located at both ends of the heat storage tank, and a pipe that branches off from the main pipe. The main piping is equipped with a bypass piping that communicates with the terminal tank part, a cooling/heating device and a variable speed pump that are installed in the main piping, and a flow control valve that is installed in the bypass piping. An inlet temperature sensor and an outlet temperature sensor are provided for detecting the water temperature at the inlet side portion and the outlet side portion of the cooling/heating device, respectively, and an inlet temperature sensor and an outlet temperature sensor detected by the inlet temperature sensor are provided. When the inlet temperature is within a predetermined range based on the detected outlet temperature, the rotational speed of the pump is controlled so as to keep the outlet temperature constant with the flow rate control valve closed; A control device for a heating and cooling system, characterized in that a control device is provided for controlling the opening of the flow rate control valve so that the inlet temperature is within the range when the temperature falls outside the range.