CN201129827Y - A central air-conditioning control device - Google Patents

Abstract

The utility model discloses a central air-conditioning control device, which comprises: each sensor for inducting load data, and an input device connected with each sensor for receiving the inductive data, and the input device is connected to analyze the inductive data and send a corresponding control signal A controller, the controller is connected to an output device that forwards the control signal, the output device is connected to a frequency conversion control device that operates according to the control signal, and the frequency conversion control device is connected to the chilled water pump, air conditioner host, cooling water pump, heating Water pump, cooling tower fan device, fresh air device, terminal fan device; the controller is connected to the liquid supply control device and the electric control valve of the water separator that operate according to the control signal. The central air-conditioning control equipment of the utility model can analyze various sensing data sensed by the sensor, and generate corresponding control signals according to the analyzed results, so as to ensure the comprehensive regulation and control of the central air-conditioning.

Description

A central air-conditioning control device

technical field

The utility model relates to the technical field of automatic control, in particular to a central air-conditioning control device.

Background technique

In daily life, due to temperature changes, many buildings are equipped with central air conditioners. The central air conditioner can centrally heat or cool the multiple office spaces of the building at the same time, so as to adjust the indoor temperature to the temperature required by the user.

A central air conditioner usually includes an air conditioner host device, an auxiliary device, and a terminal fan device. Among them, the host device includes compressor, evaporator, condenser, etc.; the auxiliary device includes refrigeration pump, cooling pump, cooling tower fan; the terminal fan device includes fresh fan and terminal air handler, etc.

The load of the current central air conditioner is designed according to the full load, and a safety factor is added, but in fact the air conditioner will not run at full load most of the time. According to statistics, about 80% of the time the central air conditioner is running under 75% low load. Most central air conditioners are designed as constant flow and constant air volume systems. When the load is low, the air volume and water volume are often too large, which causes a great waste of energy.

In order to reduce energy waste, many central air conditioners now use frequency converters to adjust the energy saving mode, which not only adjusts the speed of the motor according to the load changes of the chilled water pump, cooling water pump and fan unit, but also makes the water pump and fan work faster when the central air conditioner is working normally. Adjust accordingly to achieve energy saving. Some air-conditioning water pump frequency conversion energy-saving control devices are equipped with temperature sensors at the inlet and outlet of chilled water and cooling water inlet and outlet respectively, and compare the temperature difference between the inlet and outlet of chilled water and the inlet and outlet of cooling water with the set temperature difference , to control the operating frequency of the pump. This structure can adjust the rotation speed of the water pump motor according to the situation, and has a certain energy-saving effect. However, the operation process of the central air conditioner is affected by many factors. The operation process is a nonlinear change situation. The temperature difference adjustment is only one aspect and cannot represent all the operation conditions of the central air conditioner. Only relying on the temperature difference adjustment can not achieve a good adjustment effect; and if the control is not proper, it will also cause energy transfer.

Utility model content

In view of this, the utility model is to provide a central air-conditioning control device to solve the above-mentioned problem that the central air-conditioning is adjusted by temperature difference, and the adjustment effect is not good.

In order to solve the above problems, the utility model provides a central air-conditioning control device, including: a first temperature sensor installed at the chilled water inlet of the air conditioner main unit, a second temperature sensor installed at the chilled water outlet of the air conditioner main unit, and a second temperature sensor installed at the cooling water inlet of the air conditioner main unit The third temperature sensor at the water outlet, the fourth temperature sensor at the cooling water outlet, the fifth temperature sensor installed at the water outlet of the water separator electric control valve, the sixth temperature sensor installed at the water return port of the water collector, and the indoor The seventh temperature sensor and the carbon dioxide concentration sensor, the eighth temperature sensor installed outdoors, and the flow sensor installed at the chilled water loop; each sensor is connected to an input device for receiving sensing data, and the input device is connected to an analysis institute The controller that senses the data and sends the corresponding control signal, the controller is connected to the output device that forwards the control signal, the output device is connected to the frequency conversion control device that performs operations according to the control signal, and the frequency conversion control device is connected to the freezer Water pump, air conditioner host, cooling water pump, heating water pump, cooling tower fan device, fresh air device, terminal fan device; the controller is connected to the liquid supply volume control device and the electric control valve of the water separator that operate according to the control signal.

Preferably, the controller is also connected to a man-machine interface that displays the control signal and receives input commands.

Preferably, the controller is also equipped with a computer network communication interface.

Preferably, the computer network communication interface is a Bluetooth interface, an infrared interface, an RJ45, RS485, RS232 interface or an 802.11 interface.

Preferably, the computer network interface is also connected to a remote control computer.

The central air-conditioning control equipment of the utility model can analyze various induction data sensed by the sensor, and generate corresponding control signals according to the analyzed results, so as to ensure the comprehensive control of the central air-conditioning, thereby solving the problem of only relying on a single The simple adjustment effect of the central air conditioner is poor in the temperature difference adjustment.

Description of drawings

Fig. 1 is a structural diagram of a preferred embodiment of the present invention.

Detailed ways

In order to clearly illustrate the central air-conditioning control equipment of the present utility model, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

Referring to Fig. 1, Fig. 1 is a structural diagram of a preferred embodiment of the present utility model. The central air-conditioning control device in this embodiment includes: a first temperature sensor installed at the chilled water inlet of the air conditioner host, a second temperature sensor installed at the chilled water outlet of the air conditioner host, and a third temperature sensor installed at the cooling water inlet of the air conditioner host. Sensors, the fourth temperature sensor at the cooling water outlet, the fifth temperature sensor installed at the outlet of the electric control valve of the water separator, the sixth temperature sensor installed at the water return port of the water collector, the seventh temperature sensor installed indoors and A carbon dioxide concentration sensor, an eighth temperature sensor installed outdoors, and a flow sensor installed at the chilled water loop; each sensor is connected to an input device for receiving sensing data, and the input device is connected to analyze the sensing data and send A controller corresponding to the control signal, the controller is connected to an output device that forwards the control signal, the output device is connected to a frequency conversion control device that performs operations according to the control signal, and the frequency conversion control device is connected to a chilled water pump, an air conditioner host, Cooling water pump, heating water pump, cooling tower fan device, fresh air device, terminal fan device; the controller is connected to the liquid supply volume control device and the electric control valve of the water separator that operate according to the control signal.

The above-mentioned controller is equipped with a control module, which can analyze and process the sensing data indicating the load intensity received by each sensor, and generate feedback control signals according to the preset threshold to control the air conditioner, chilled water pump, cooling The operation of frequency conversion control devices for water pumps, cooling tower fans, heating water pumps, terminal fan devices and fresh air devices; and reasonable adjustment of the refrigerant liquid supply of the liquid supply control device and the electric control valve controller of the water separator according to the actual load of the device degree of opening.

The controller sends the control signal to the frequency conversion control device through the output device, and controls the various actuators of the central air conditioner through the frequency conversion control device. The cooling tower fan, heating water pump, terminal fan device and fresh air device realize frequency conversion control, reasonably adjust the opening degree of the electric control valve on the water separator, achieve variable flow and variable air volume operation, and adjust the liquid supply of refrigerant in real time according to the actual load. achieve load control.

When the control device in the above embodiment performs control, for the chilled water loop of the central air conditioner, a minimum operating frequency of chilled water can be determined first to ensure the normal and safe operation of the central air conditioner. When the load changes, these parameters detected by the chilled water inlet and outlet temperature sensors, water separator temperature sensor, water collector temperature sensor, indoor temperature sensor and terminal flow sensor are sent to the controller through the input device, and the controller The collected real-time data, air quality and historical operation data can calculate the cooling capacity required by the central air-conditioning load in real time, as well as the optimal value of the temperature and temperature difference of the frozen supply and return water, and use these values to compare with the current operating parameters to adjust the distribution reasonably. The opening degree of the electric control valve of the water heater is used to adjust the output frequency of the inverter, control the speed of the chilled water pump, and change its flow rate so that the temperature of the supply and return water of the chilled water device, the temperature difference and the flow rate of each zone run within the range given by the controller. The optimal value.

When the control device in the above embodiment performs control, for the heating loop of the central air conditioner, a minimum operating frequency of heating water can be determined first to ensure normal and safe operation of the device. When the load changes, the heating water inlet and outlet water temperature sensor, water separator temperature sensor, water collector temperature sensor, indoor temperature sensor and terminal flow sensor will send these parameters detected to the controller through the input device, and the controller will The collected real-time data, control quality and historical operation data of the device can calculate the actual load required by the load in real time, as well as the optimum value of heating supply and return water temperature and temperature difference, and compare these values with the current operating parameters to adjust the distribution reasonably. The opening degree of the electric control valve of the water heater is used to adjust the output frequency of the frequency converter, control the speed of the heating water pump, and change its flow rate so that the temperature, temperature difference, and flow rate of each zone of the heating water device run within the range given by the controller. The optimal value.

When the control device in the above embodiment executes the control, for the cooling water loop of the central air conditioner, a minimum operating frequency of the cooling water pump can be determined first, and the highest and lowest temperature of the cooling water can ensure normal and safe operation of the device. When the ambient temperature and device load change, the load of the central air conditioner host will change accordingly, and the optimal condensing temperature of the host condenser will also change accordingly. Based on the collected cooling water inlet and outlet temperature and outdoor temperature real-time data and the historical operation data of the device, the controller calculates the optimal temperature of the host condenser and the optimal inlet temperature of the cooling water, and compares the temperature with the actual operating temperature Make a comparison, and use it to adjust the output frequency of the cooling water pump inverter, control the cooling water pump, and dynamically adjust the cooling water flow, so that the inlet temperature of the cooling water approaches the optimal value given by the controller, so as to ensure that the central air conditioner is at its optimum at any time. Operate with the best conversion efficiency.

Because the cooling water device adopts the best conversion efficiency control, it ensures that the central air conditioner is in the best working state under the condition of full load and partial load, and always maintains the best energy utilization rate, thereby reducing the energy consumption of the air conditioner Efficiency is improved, because the device adopted is automatic load optimization control, which not only avoids the energy transfer of the host device, but also saves the energy consumption of the cooling water pump to the greatest extent because the cooling water pump often operates below the rated load.

When the control device in the above embodiment performs control, for the terminal fan device of the central air conditioner and the variable air volume device of the fresh fan:

According to the characteristics of the fan device, first determine a minimum operating frequency of the fan to ensure the safe operation of the device. When the indoor temperature, indoor carbon dioxide concentration and load change, the indoor temperature sensor, outdoor temperature sensor and carbon dioxide concentration sensor will send these detected parameters to the controller, and the controller will Real-time calculation of the air volume required by the air-conditioning load and the optimal value of the set temperature, and then adjust the output frequency of the inverter, control the speed of the fan, change the air volume of the terminal fan and the fresh air volume of the fresh fan to keep the indoor temperature running under control The optimal value given by the device, so as to ensure the comfort of the room.

When the control device in the above embodiment executes the control, for the cooling tower fan device of the central air conditioner, a minimum operating frequency of the fan can be determined first according to the characteristics of the cooling tower and the main engine of the central air conditioner, so as to ensure the safe operation of the device. When the outdoor temperature, cooling water inlet and outlet temperature and air conditioner load change, the outdoor temperature sensor and the cooling water inlet temperature sensor are sent to the controller, and the controller calculates the temperature according to the working conditions of the main engine based on the collected real-time data and historical data. The inlet temperature of cooling water is used to adjust the output frequency of the inverter and control the speed of the fan to obtain a good energy-saving effect.

When the control device in the above embodiment executes the control, for the electric control valve of the water separator of the central air conditioner, an appropriate flow range can be determined first to ensure the safe operation of the device. When the temperature of the control area, the temperature of the inlet and outlet of cold and cold water, and the load of the air conditioner change, the electric control valve temperature sensor and the chilled water inlet temperature sensor will send the real-time detected data to the controller, and the controller will, according to the collected real-time data and historical data, Calculate the chilled water flow value required by the working conditions of the control area, and adjust the opening degree of the electric control valve to obtain a good energy-saving effect.

When the control equipment in the above-mentioned embodiments performs control, for the liquid supply control device of the central air conditioner, when the temperature in the control area, the temperature of the cold water in and out, and the load of the air conditioner change according to the actual load of the air conditioner, the controller can use the collected real-time Data and historical data, calculate the reasonable cooling capacity required by the working conditions, and use this to control the amount of refrigerant liquid supply, so that the device can operate under reasonable air-conditioning conditions.

In the above-mentioned embodiments, the controller can also be equipped with computer network communication interfaces, which can be Bluetooth interfaces, infrared interfaces, RJ45, RS485, RS232 interfaces or 802.11 interfaces and other network interfaces for computer communication. The controller is connected with the remote control computer through the network interface.

At the same time, in the case of connecting to the network through a remote control computer, the central air-conditioning control equipment can not only realize fully automatic control, but also realize remote control by coordinating the timing switch, main engine, water pump, fan and electric control valve. At this time, a database can be established for the air conditioner, and the real-time data and historical data can be analyzed through the remote data analysis center, and continuous comparative analysis and adjustment can be made to achieve better power saving effects.

In the above-mentioned embodiments, the controller can also be connected to a human-machine interface, and the automatic optimization of device load control can be realized by using software and database settings.

The central air-conditioning control equipment in the above embodiments has the following advantages:

(1) Due to the installation of the indoor temperature sensor and the indoor carbon dioxide sensor, on the one hand, it can realize the frequency conversion control of the terminal fan device and the fresh fan device, realize energy saving and provide a more comfortable environment, and on the other hand, it can control the air conditioner more effectively , chilled water pump and cooling water pump operation, improve energy saving effect;

(2) By setting up the electric control valve controller, on the one hand, it can realize the flow control of each partition, realize energy saving and provide a more comfortable environment; Improve energy saving effect;

(3) In the cooling water loop, by setting a temperature sensor outdoors and a temperature sensor at the cooling water inlet, using the characteristics of the cooling water loop, the historical data of the outdoor temperature and the load of the main engine, the cooling water flow is analyzed. The optimal temperature value of the water is used to control and adjust the operating load of the cooling water pump, which is better than using the temperature difference method to control the cooling water pump and the pressure difference method to control the cooling water pump;

(4) In the cooling tower, by setting a temperature sensor outdoors and a temperature sensor at the cooling water inlet, using the historical data of the cooling water temperature and outdoor temperature and the load of the main engine, analyze the optimal cooling water intake The temperature value is used to control and adjust the operating frequency of the cooling tower fan to improve the energy saving effect of the cooling tower device;

(5) The controller can be connected to the two-way communication of the remote control computer, so that remote control can be realized. Therefore, a powerful software control device composed of monitoring software and historical database can be realized. During operation, its database is constantly improved and enriched device, and then analyze and correct the operating parameters to achieve the optimal control effect.

The preferred embodiment of the utility model has been described in detail above. For the central air-conditioning control equipment described in the embodiment, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model shall include Within the protection scope of the present utility model.

Claims (5)

1, a kind of central air-conditioning control appliance, it is characterized in that, comprise: first temperature sensor that is installed in the chilled water water inlet of air-conditioner host, second temperature sensor of chilled water delivery port, be installed in the three-temperature sensor of air-conditioner host cooling water intake, the 4th temperature sensor of cooling water outlet, be installed in the 5th temperature sensor of water knockout drum motor-operated control valve delivery port, be installed in the 6th temperature sensor of water collector water return outlet, be installed in the 7th indoor temperature sensor and gas concentration lwevel sensor, be installed in the 8th outdoor temperature sensor, be installed in the flow sensor at chilled water loop place; Described each sensor connects the input unit that is used to receive sensed data, described input unit connects the controller of analyzing described sensed data and sending corresponding control signal, described controller connects the output device of transmitting described control signal, described output device connects the frequency-converting control device according to described control signal executable operations, and described frequency-converting control device connects chilled water pump, air-conditioner host, cooling water pump, heating water pump, cooling tower blower fan apparatus, aeration device, terminal blower fan apparatus; Described controller connects liquid supply rate control device and the water knockout drum motor-operated control valve according to described control signal executable operations.

2, central air-conditioning control appliance according to claim 1 is characterized in that, described controller also connects the man-machine interface that shows described control signal and receive input command.

3, central air-conditioning control appliance according to claim 1 is characterized in that, described controller also is equipped with the computer network communication interface.

4, central air-conditioning control appliance according to claim 3 is characterized in that, described computer network communication interface is blue tooth interface, infrared interface, RJ45, RS485, RS232 interface or 802.11 interfaces.

5, central air-conditioning control appliance according to claim 3 is characterized in that, described computer network interface also connects remote control computer.

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