CN201866888U - Central air conditioner control system with cooling/heating in combination with fresh air function at radiation terminal - Google Patents

Abstract

The utility model discloses a central air-conditioning control system that uses cooling and heating at the radiation end and cooperates with fresh air. Frequency converter, return air fan frequency converter, inlet water temperature sensor, outlet water temperature sensor, indoor temperature sensor, indoor humidity sensor and indoor carbon dioxide concentration sensor. The utility model is simple and reliable, effectively guarantees the requirements of indoor personnel on temperature, humidity and high-quality fresh air, and realizes energy-saving operation of the system at the same time.

Description

A central air-conditioning control system with radiant terminal heating and cooling combined with fresh air

technical field

The utility model relates to a central air-conditioning system with heating and cooling at the radiating end and fresh air, in particular to a household control method for a new air-conditioning system with heating and cooling at the radiating end and with fresh air.

Background technique

With the development of the economy and the improvement of people's living standards, people's requirements for air-conditioning comfort and indoor air quality have also increased; at the same time, the energy consumption of air-conditioning in buildings is also increasing. The air-conditioning system with radiant terminal cooling and heating combined with fresh air treatment is considered to be an economical, energy-saving and comfortable form of central air-conditioning system, and has been gradually studied and applied. Radiant end heating refers to changing the temperature of the ceiling, wall or floor in the enclosure structure to form a radiation surface, relying on the radiation heat exchange between the radiation surface and the human body, heat source, furniture and other surfaces of the enclosure structure to achieve cooling/ Heating effect technology. Representative techniques include ceiling radiation, floor radiation, and wall radiation.

The air conditioning system with cooling and heating at the radiant end combined with fresh air treatment can effectively reduce the vertical temperature gradient of indoor air, improve thermal comfort, and the indoor air velocity is also lower than that of conventional all-air systems; compared with the water temperature for fresh air treatment, in general, The water temperature required for radiant cooling is higher, while the water temperature required for radiant heating is lower, which makes the operating conditions of the unit more energy-saving; at the same time, the required air treatment energy consumption is greatly reduced due to the reduced air supply volume. A certain amount of fresh air meets the needs of indoor air quality.

On the basis of the existing energy-saving advantages of the new central air-conditioning system with radiant end and fresh air, develop a control method suitable for the integrated unit with radiant end and fresh air (hereinafter referred to as the radiant fresh air integrated machine). Using the analog quantity control function of the frequency converter, through the real-time collection of parameters such as the outlet water temperature, return water temperature, fresh air supply temperature, supply air humidity, and indoor carbon dioxide concentration of the radiant fresh air all-in-one machine, the collected temperature, humidity, carbon dioxide Analog quantities such as concentration and temperature difference are input to the controller for simple fuzzy operation control.

Utility model content

Technical problem: The radiant end is a new type of household central air-conditioning system with the cooperation of fresh air supply. The purpose of this utility model is to develop an integrated control method to control the outlet water temperature, fresh air supply temperature and air supply humidity of the radiant fresh air integrated machine at the radiant end. , as the indoor temperature, humidity, and carbon dioxide concentration change, there will be dynamic changes, so as to realize the household-style controllable function of this new air-conditioning system. The disadvantages of the existing central air-conditioning energy-saving control technology are overcome. In addition, the control method can separately control the indoor load of water treatment at the radiant end and the load of fresh air. For example, when the humidity of the indoor radiant surface is too high in summer, it is effective to increase the outlet water temperature at the radiant end and reduce the fresh air supply temperature. It can effectively solve the problem of dew condensation caused by fresh air on the radiation surface under cooling conditions; it has the characteristics of high efficiency and energy saving, easy integrated control, safety and reliability.

Technical solution: The utility model provides a central air-conditioning control system for cooling and heating at the radiant end with fresh air, including a controller, a human-computer interaction interface, an analog input module, an analog output module, a switch control module, a water pump inverter, Air supply fan inverter, return air fan inverter, inlet water temperature sensor, outlet water temperature sensor, indoor temperature sensor, indoor humidity sensor and indoor carbon dioxide concentration sensor; among them, inlet water temperature sensor, outlet water temperature sensor, indoor temperature sensor, indoor humidity The output terminals of the sensor and the indoor carbon dioxide concentration sensor are respectively connected to the input terminal of the analog input module, and the output terminal of the analog input module is connected to the input terminal of the controller. The output end of the device is connected to the analog output module in series, and then connected to the input ends of the water pump inverter, the air supply fan inverter and the return air fan inverter.

Preferably, a time module is provided in the controller.

Beneficial effect:

(1) The utility model uses the analog quantity control function of the frequency converter, through the real-time collection of parameters such as the outlet water temperature and return water temperature at the radiation end, the fresh air supply temperature, the supply air humidity, and the indoor carbon dioxide concentration, the collected temperature, humidity, carbon dioxide Analog values such as concentration and temperature difference are input to the controller (1) for simple fuzzy calculations to control the speeds of the water pump inverter (6), the air supply fan inverter (7) and the return air fan inverter (8) to adjust energy adaptation Changes in indoor load. It provides a simple, reliable, and energy-saving control method for users to use an air-conditioning system with radiant end heating and fresh air treatment with higher comfort.

(2) The utility model uses the real-time detection of the indoor humidity sensor (12) and the real-time values of the water inlet temperature sensor (9) and the water outlet temperature sensor (10) as the basis for judging dew condensation. After fuzzy processing by the controller (1), the controller (1) controls The waterway bypass switch at the radiation end is turned on to bypass the cold water at the radiation end, and at the same time reduce the speed of the air supply fan, reduce the fresh air volume, and quickly eliminate the risk of condensation in the room.

(3) The controller of the utility model is equipped with a time module, which realizes the regular start and stop of the air-conditioning system with cooling and heating at the radiation end and fresh air treatment, ensuring the comfort of indoor personnel and energy-saving operation of the air-conditioning system.

Description of drawings

Fig. 1 is a functional block diagram of a new central air-conditioning control system provided by the utility model with cooling and heating at the radiant end and fresh air.

Detailed ways

The air-conditioning system applicable to the utility model can be two independent units, one unit is responsible for producing water at the temperature required for heating and cooling at the radiation end, and the other unit is responsible for producing fresh air with suitable temperature and humidity required indoors; it can also be a Taiwan radiant fresh air integrated unit, under cooling conditions, first prepares lower temperature water to prepare fresh air with suitable temperature and humidity required for the room, and then passes through the intermediate heat exchanger to obtain higher temperature water required for radiant end cooling , Under the heating condition, the higher temperature water is first produced to be responsible for the fresh air with suitable temperature and humidity required in the room, and then through the intermediate heat exchanger to obtain the lower temperature water required for the heating of the radiant end.

Describe the utility model in detail below in conjunction with accompanying drawing.

In Fig. 1, the utility model is provided with a controller 1, a man-machine interaction interface 2, an analog input module 3, an analog output module 4, a switch control module 5, a water pump inverter 6, and an air blower inverter 7. Return air fan inverter 8, inlet water temperature sensor 9, outlet water temperature sensor 10, indoor temperature sensor 11, indoor humidity sensor 12, and indoor carbon dioxide concentration sensor 13. The analog signal acquisition input terminal of the controller 1 is connected to the analog quantity acquisition output terminal of the analog quantity input module 3, the analog signal output terminal of the controller 1 is connected to the input terminal of the analog quantity output module 4, and the output module 4 obtains relevant digital data from the controller 1. signal to obtain an analog voltage signal; the controller 1 is also connected to the human-computer interaction interface 2 and the switch control module 5, and the switch control module 5 is connected to the equipment contactor; the analog acquisition input terminals of the analog input module 3 are respectively connected to the inlet water temperature Sensor 9, outlet water temperature sensor 10, indoor temperature sensor 11, indoor humidity sensor 12, indoor carbon dioxide concentration sensor 13; the output end of the analog output module 4 is respectively connected to the analog signal acquisition input end of the water pump inverter 6, and the air blower inverter 7 analog signal acquisition input, and return air fan frequency converter 8 analog signal acquisition input.

There is a time module in the controller 1, which can set the timing start and stop of heating and cooling of the radiation end and fresh air supply. Different from traditional all-air household air conditioners, the air conditioning system with radiant end and fresh air supply needs to achieve the most energy-saving and comfortable effect under the condition of reasonable start and stop time of radiant end and fresh air processing equipment. By setting the start-stop time of the radiation terminal and the fresh air processing equipment for the time module in the controller 1, the energy-saving operation of the system can be realized under the condition that the comfort of the indoor personnel is the highest.

A water inlet temperature sensor 9 , an outlet water temperature sensor 10 , an indoor temperature sensor 11 , an indoor humidity sensor 12 , and an indoor carbon dioxide concentration sensor 13 are connected to the signal acquisition input end of the analog input module 3 . The analog signal acquisition input terminal of the controller 1 is connected to the analog quantity acquisition output terminal of the analog quantity input module 3, and the analog quantity input module 3 collects the temperature signal, humidity signal and concentration signal of each sensor in real time, and sends them to the controller 1 for fuzzy processing. operation.

The input end of the analog output module 4 is connected to the analog signal output end of the controller 1, and the output end of the analog output module 4 is respectively connected to the analog signals of the water pump inverter 6, the air supply fan inverter 7 and the return air fan inverter 8. Signal acquisition input terminal; the analog output module 4 receives the digital signal control quantity output by the controller 1, converts it into an analog voltage signal, and sends it to each inverter respectively; the water pump inverter 6 connects the three-phase cable and the water pump, and inputs the analog voltage signal The voltage value controls the speed of the water pump, the air supply fan inverter 7 is connected to the three-phase cable and the air supply fan, and the analog voltage value is input to control the speed of the air supply fan, and the return air fan inverter 8 is connected to the three-phase cable and the return air fan, and the analog voltage value is input Control the return air fan speed.

The switching value control module 5 is connected to the contactor of the water pump frequency converter 6, the contactor of the air supply fan frequency converter 7, and the contactor of the return air fan frequency converter 8, and controls the start and stop of the frequency converters. The switch control module 5 is also connected to the waterway bypass switch at the radiation end. When condensation warning occurs in summer cooling conditions, the switch control module 5 controls the waterway bypass switch at the radiation end to turn on the cold water at the radiation end to eliminate the risk of condensation in the room.

The control principle of the utility model is: through the inlet water temperature sensor 9 and the outlet water temperature sensor 10, the inlet water temperature and the return water temperature of the radiation end are detected in real time, and the indoor cooling (heat) load borne by the radiation end is obtained, and the temperature difference is used as the flow rate of the water pump According to the control basis, after the collected signal is processed by the control software in the controller 1, a feedback digital signal is generated, and the analog output module 4 outputs an analog voltage to the water pump inverter 6 to control the speed of the water pump to adjust the water flow and realize the responsibility of the radiation end. The load is adjusted according to the actual load in the room; the indoor temperature, humidity and carbon dioxide concentration are detected in real time by the indoor temperature sensor 11, the indoor humidity sensor 12, and the indoor carbon dioxide concentration sensor 13, so as to determine the size of the fresh air volume and return air volume. Control basis, after the collected signal is processed by the control software in the controller 1, a feedback digital signal is generated, and the analog output module 4 outputs an analog voltage to the air supply fan inverter 7 and the return air fan inverter 8 to control the air supply fan and the speed of the return air fan to adjust the fresh air volume, and realize the follow-up adjustment of the fresh air processing load according to the actual load in the room. Reduce the energy consumption of the motor, and realize that the temperature of the water sent back from the radiation end follows the indoor load requirements in real time. At the same time, the fresh air volume and fresh air processing load also meet the indoor air temperature, humidity and oxygen content requirements.

One of the most important problems in the new type of air-conditioning system that uses the radiant end to supply fresh air is that in summer cooling conditions, when the relative humidity of the fresh air is high, the temperature of the radiant surface is low, which is likely to cause condensation on the radiant surface. The utility model detects the real-time values of the indoor humidity sensor 12, the water inlet temperature sensor 9, and the water outlet temperature sensor 10 in real time. When the controller 1 processes the corresponding real-time data collected, if it is considered that there is a risk of dew condensation, it will be controlled immediately by the switch value. Module 5 controls the waterway bypass switch at the radiation end to open the bypass cooling water at the radiation end, and at the same time reduces the speed of the air supply fan, reduces the fresh air volume, and quickly eliminates the risk of condensation in the room.

In the human-computer interaction interface 2 of the utility model, the user can directly set the water temperature at the radiation end and control the temperature and humidity of the indoor air through the buttons with corresponding functions. There is a time module in the controller 1, which can set the timing start and stop of heating and cooling of the radiation end and fresh air supply. Different from traditional all-air household air conditioners, the air conditioning system with radiant end and fresh air supply needs to achieve the most energy-saving and comfortable effect under the condition of reasonable start and stop time of radiant end and fresh air processing equipment. By setting the start-stop time of the radiation terminal and the fresh air processing equipment for the time module in the controller 1, the energy-saving operation of the system can be realized under the condition that the comfort of the indoor personnel is the highest.

Claims (2)

1. a radiation end is adopted the central air conditioning system that changes in temperature cooperate new wind, it is characterized in that comprising controller (1), man-machine interaction interface (2), analog quantity input module (3), analog output module (4), switching value control module (5), pump variable frequency device (6), breeze fan frequency converter (7), return air fan frequency converter (8), inflow temperature sensor (9), leaving water temperature sensor (10), indoor temperature transmitter (11), indoor humidity sensor (12) and indoor carbon dioxide concentration sensor (13); Inflow temperature sensor (9) wherein, leaving water temperature sensor (10), indoor temperature transmitter (11), the output of indoor humidity sensor (12) and indoor carbon dioxide concentration sensor (13) connects the input of analog quantity input module (3) respectively, the input of the output termination controller (1) of analog quantity input module (3), controller (1) respectively with man-machine interaction interface (2) and switching value control module (5) two-way communication, the output of controller (1) passes serial connection analog output module (4) back water pump frequency converter (6) respectively, the input of breeze fan frequency converter (7) and return air fan frequency converter (8).

2. a kind of radiation end as claimed in claim 1 is adopted the central air conditioning system that changes in temperature cooperate new wind, it is characterized in that being provided with time module in controller (1).

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