CN203224014U - Ice storage control system - Google Patents

Abstract

The utility model discloses an ice storage control system, which comprises a controller, and further comprises a control valve which is connected with controller signals, and the control valve is arranged on a circulatory system pipeline of an air conditioning cold supply system, and is used to control flow direction and flow rate of circulating liquid in the circulatory system of the air conditioning cold supply system. The ice storage control system enables the air conditioning cold supply system to be capable of completing smooth transition of ice storage and cold supply working condition, and further achieves an optimal control operation mode.

Description

Ice storage control system

technical field

The utility model relates to an energy conversion system, in particular to an energy conversion system for refrigeration.

Background technique

The centralized air-conditioning and refrigeration in existing buildings consumes a lot of electricity, which often results in high operating costs. In order to reduce the peak power load of the cooling system, make full use of the relevant regional power preferential policies and the difference in peak and valley power prices, reduce the investment in power transmission and transformation equipment, and greatly reduce the operating costs of air conditioners, it will be considered to use a power supply with ice storage Air-conditioning cooling system for cooling system. As shown in Figure 1, limited by the cost of equipment procurement, each type of equipment needs a group of parallel work to ensure the necessary load power. The air conditioning cooling system includes a heat dissipation system, a circulation system, and a cooling system. side, the cooling side of a set of dual-working-condition main engine 02, a set of dual-working-condition cooling pumps 03, a set of base-load cooling pumps 04, and a set of cooling towers 05 are connected to form a cooling system through water pipes. The circulation side of the base-load main engine 01, A set of base load cooling pump 06, water collector 07 and water separator 08 are connected through water pipes to form the base load circulation subsystem of the circulation system, a set of circulation side of the main engine 02 with dual working conditions, ice storage tank 10, and a set of plate changers The circulation side of the heat exchanger 11 and a group of ethylene glycol pumps 09 are connected through water pipes to form the ice storage circulation subsystem of the circulation system, the refrigeration side of a group of plate heat exchangers 11, a group of dual-working-condition refrigeration pumps 12, and water collectors 07 and water separator 08 are connected into a cooling system through water pipes. An electric valve M is installed on the water inlet and outlet pipes of each equipment in the air-conditioning and cooling system. The industrial controller adjusts the operating power of the heat dissipation system, circulation system and cooling system by controlling the opening of each electric valve M.

However, in the prior art, the control process of the ice storage condition and the control process of the refrigeration condition cannot be well coordinated, resulting in low efficiency of the cooling water pump and cooling tower in the system, waste of cold storage capacity in the ice storage tank, and double working condition main engine The working mode is single, the equipment wears out, and the service life of the system is shortened.

Utility model content

The purpose of the utility model is to provide an ice storage control system to solve the technical problems that the ice storage and cooling conditions of the air-conditioning cooling system are difficult to control and the equipment is easy to wear.

The ice storage control system of the utility model includes a controller, wherein: it also includes a control valve connected to the controller signal, and the control valve is installed on the circulation system pipeline of the air-conditioning cooling system for controlling the air-conditioning cooling system. The flow direction and flow rate of the circulating liquid in the circulation system of the system.

The control valve includes a first control valve, a second control valve, a third control valve and a fourth control valve, a first connecting branch pipe is set between the water inlet pipe and the water outlet pipe of the ice storage tank, and the water outlet pipe of the ice storage tank The second connecting branch pipe is set between the water inlet pipe of the glycol pump, the second control valve is installed on the water inlet pipe of the ice storage tank, the first control valve is installed on the first connecting branch pipe, and the second connecting branch pipe is installed on the second connecting branch pipe. Three control valves, the fourth control valve is installed on the water pipe between the water outlet pipe of the ice storage tank and the plate heat exchanger.

The ice storage control system of the utility model can make the air-conditioning cooling system switch between the ice making and refrigeration working conditions when the cooling condition of the ice melting alone or the cooling supply of the main engine cannot meet the system load requirements, and then realize " Optimal control" mode of operation, so that the cooling power peak value can be adjusted flexibly.

During the peak period of electricity price and the period of flat valley of electricity price, two optimization control strategies are adopted, namely ice-melting priority and host priority, to make full use of peak and flat electricity prices and save operating costs.

Embodiments of the utility model will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of the air-conditioning cooling system in the prior art;

Fig. 2 is a structural schematic diagram of the ice storage control system of the present invention;

Fig. 3 is a schematic diagram of the layout position of the control valve of the ice storage control system of the present invention;

Fig. 4 is a schematic diagram of the layout position of the sensors of the ice storage control system of the present invention.

Detailed ways

As shown in Figure 2, the ice storage control system of the present invention includes a controller 20, a pipeline temperature sensor 21, a pressure sensor 22, a flow sensor 23, a liquid level sensor 24, an ambient temperature sensor 25, a control valve V and an electric valve M ,

The controller 20 adopts the S7-300 series controller, which is used to receive the status signals collected by each sensor, generate corresponding equipment linkage control signals according to the built-in control strategy, and control the opening status of each electric valve and control valve;

The pipeline temperature sensor 21 is used to collect the temperature change of the circulating liquid in the water pipeline;

The pressure sensor 22 is used to collect the pressure change of the circulating liquid in the water pipe;

The flow sensor 23 is used to collect the flow change of the circulating liquid in the water pipe;

The liquid level sensor 24 is used to collect the change of the liquid level in the ice storage tank;

Ambient temperature sensor 25, used to collect ambient temperature changes on the user side of the air-conditioning and cooling system;

The electric valve M is used to control the switch status of the water inlet and outlet pipes of each equipment in the air-conditioning and cooling system;

The control valve V is installed on the circulation system pipeline of the air-conditioning and cooling system, and is used to control the flow direction and flow rate of the circulating liquid in the circulation system of the air-conditioning and cooling system;

Each sensor, electric valve M, and control valve V are connected to the controller through signal transmission lines to complete the transmission of control signals and state acquisition signals.

The ice storage control system of the utility model controls the opening state of the control valve V by collecting the pipeline state parameters of each circulation subsystem in the air-conditioning cooling system, and changes the flow direction and flow rate of the circulating liquid in the circulation system of the air-conditioning cooling system; The dual-working-condition host 02 can store cooling capacity for the ice storage tank when the electricity price is cheap, and partially or completely replace the dual-working-condition host 02 for refrigeration during peak power consumption to reduce power consumption, or work in coordination with the dual-working-condition host 02 , improve peak cooling efficiency.

As shown in Figure 3, in the ice storage circulation subsystem, the first connecting branch pipe L1 is set between the water inlet pipe and the water outlet pipe of the ice storage tank 10, and the water outlet pipe of the ice storage tank and the water inlet pipe of the glycol pump 09 A second communication branch pipe L2 is set between them, a second control valve V2 is installed on the water inlet pipe of the ice storage tank 10, a first control valve V1 is installed on the first communication branch pipe L1, and a third control valve is installed on the second communication branch pipe L2. Valve V3, the fourth control valve V4 is installed on the water pipe between the water outlet pipe of the ice storage tank and the plate heat exchanger 11.

When the controller 20 controls the first control valve V1 to be closed, the second control valve V2 to be opened, the third control valve V3 to be closed, and the fourth control valve V4 to be opened, the working condition program can be changed to realize ice storage of the main engine under dual working conditions;

When the controller 20 controls the first control valve V1 to be opened, the second control valve V2 to be closed, the third control valve V3 to be opened, and the fourth control valve V4 to be closed, the working condition program can be changed to realize separate cooling of the main unit under dual working conditions;

When the controller 20 controls the opening states and angles of the first control valve V1, the second control valve V2, the third control valve V3 and the fourth control valve V4, the working condition program can be changed to realize the independent cooling of the ice storage tank;

When the controller 20 controls the opening states and angles of the first control valve V1, the second control valve V2, the third control valve V3 and the fourth control valve V4, the working condition program can be changed to realize the optimization of the ice storage tank and the dual working condition main engine control.

As shown in Figure 4, in the heat dissipation system of the air-conditioning cooling system, a pipeline temperature sensor 21 is installed on the water inlet pipe and the water outlet pipe of the cooling tower 05, and the water outlet pipes of the base load main engine 01 and the dual working mode main engine 02;

In the circulation system of the air-conditioning cooling system, a pipeline temperature sensor 21 and a pressure sensor 22 are installed on the water pipe between the ice storage tank 10 and the dual-working mode main engine 02, and a pipeline temperature sensor 21 is installed on the outlet pipe of the ice storage tank 10 A pipeline temperature sensor 21, a pressure sensor 22, and a flow sensor 23 are installed on the water pipe between the first communicating branch pipe L1 and the second communicating branch pipe L2, and a pipeline temperature sensor 21 is installed on the water pipe between the glycol pump 09 and the second communicating branch pipe L2. Sensor 21, pressure sensor 22, pipeline temperature sensor 21 is installed on the water pipe between the second communication branch pipe L2 and the plate heat exchanger 11, and pipeline temperature sensor 21 is installed on the water pipe between the base load refrigeration pump 06 and the water separator 08 , a flow sensor 23, a liquid level sensor 24 is installed in the ice storage tank 10;

In the cooling system of the air-conditioning cooling system, a pipeline temperature sensor 21 is installed on the water pipe between the plate heat exchanger 11 and the double-working condition refrigerator 12, and a pipe temperature sensor 21 is installed on the water pipe between the plate heat exchanger 11 and the water collector 07. A road temperature sensor 21, a pressure sensor 22 is installed on the water pipe between the water distributor 08 and the water collector 07 and the load 13 on the user side, and an ambient temperature sensor 25 is installed on the load 13 on the user side.

The temperature, pressure, and flow signals of each pipeline in the air-conditioning and cooling system can be collected by each sensor, so that the controller 20 can obtain accurate control feedback signals, improve the accuracy of the generated control signals, and accurately control the opening and closing of the electric valve and the control valve. state. Cooperating with the linkage control of the equipment by the controller 20, a flexible refrigeration and ice-making control process is realized.

According to the signals of each sensor, the controller adjusts the operating parameters of the equipment to optimize the operation sequence of the equipment and reduce the wear and tear of a single equipment.

When the ice melting is prioritized, the maximum rate of ice melting, according to the load demand, the controller controls the number of hosts with dual working conditions, and controls the set value of the outlet temperature of the dual working condition hosts according to the optimization strategy, and at the same time controls the third control valve V3, the first Four control valves V4, supplementary adjustment control the temperature of the refrigerated supply and return water to meet the end requirements, and ensure that the load rate of the main engine is above 40%. When the main engine is prioritized, the dual-working condition main engine is first turned on and runs at the maximum power. When the two dual-working condition main engines are all turned on and cannot meet the end load requirements, the controller adjusts the opening of the first control valve V1 and the second control valve V2. , to melt ice and control the ice melting rate of the ice tank to ensure the needs of the end load.

The above-mentioned embodiments are only described to the preferred implementation of the utility model, and are not limited to the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (2)

1. ice-reserving control system, comprise controller (20), it is characterized in that: also comprise the control valve (V) that is connected with described controller (20) signal, described control valve (V) is installed on the circulatory system pipeline of air-conditioning cold supply system, is used for the flow direction and the flow of the circulatory system circulating fluid of control air-conditioning cold supply system.

2. ice-reserving control system according to claim 1, it is characterized in that: described control valve (V) comprises first control valve (V1), second control valve (V2), the 3rd control valve (V3) and the 4th control valve (V4), between the water inlet pipe of Ice Storage Tank (10) and outlet pipe, arrange first and be communicated with arm (L1), between the water inlet pipe of the outlet pipe of Ice Storage Tank (10) and eg pump (09), arrange second and be communicated with arm (L2), water inlet pipe in Ice Storage Tank (10) is installed second control valve (V2), be communicated with arm (L1) first first control valve (V1) is installed, be communicated with arm (L2) second the 3rd control valve (V3) is installed, at outlet pipe and the water pipe between plate type heat exchanger (11) of Ice Storage Tank (10) the 4th control valve (V4) is installed.

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