CN1707188A - Whole-fresh air precision air conditioning system - Google Patents

Whole-fresh air precision air conditioning system Download PDF

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Publication number
CN1707188A
CN1707188A CN 200410027488 CN200410027488A CN1707188A CN 1707188 A CN1707188 A CN 1707188A CN 200410027488 CN200410027488 CN 200410027488 CN 200410027488 A CN200410027488 A CN 200410027488A CN 1707188 A CN1707188 A CN 1707188A
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China
Prior art keywords
control
pid
temperature
humidity
enthalpy
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Pending
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CN 200410027488
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Chinese (zh)
Inventor
方沛明
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GUANGDA REFRIGERATING CO Ltd DONGGUAN
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GUANGDA REFRIGERATING CO Ltd DONGGUAN
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Application filed by GUANGDA REFRIGERATING CO Ltd DONGGUAN filed Critical GUANGDA REFRIGERATING CO Ltd DONGGUAN
Priority to CN 200410027488 priority Critical patent/CN1707188A/en
Publication of CN1707188A publication Critical patent/CN1707188A/en
Pending legal-status Critical Current

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Abstract

The completely fresh air constant temperature and constant humidity air conditioner system features that fresh air is pre-cooled and further cooled to have temperature reduced to the required value, and this can avoid overload of the compressor. In the control system, advanced DDC controller and combined DID algorithm are adopted and the PID value of enthalpy difference is utilized in controlling the operation of the compressor and the refrigeration amount and the dehumidifying amount of the system. Through comparison between the practical temperature and the set temperature, one P control value is output to control the number of the operating heaters. Through comparison between the practical humidity and the set humidity and PID calculation, one PID value is output to control the humidifying amount of the humidifier. Thus, the temperature and the humidity are controlled precisely.

Description

Brand-new wind precision air conditioner system
Affiliated technical field
What the invention was related is field of heating ventilation air conditioning, constant temperature and humidity air-conditioning system in the central air-conditioning field of saying so more specifically.
Technical background
Among constant temperature and humidity precision air conditioner system, usually adopt air return system, perhaps adopt new return air hybrid system, make the interior refrigerating capacity that requires of controlled chamber reduce greatly like this, saved the cost of investment first of unit, but existed return air among the precision air conditioner system, can not discharge the air of indoor contaminated mistake outdoor fully, make air cross pollution of opening and shaft in the controlled chamber, can not really control the cleanliness factor of controlled space air.
The content of innovation and creation
The technical problem that the invention will solve is: provide a kind of system of novel precision air conditioner to solve the existing existing problem of precision air conditioner.By adopting brand-new wind system among the precision air conditioner system, solved because air-conditioned room is interior owing to new return air mixes the not high problem of air purity in the controlled chamber that causes.
The content of the invention is: design a kind of novel precision air conditioner system, adopt brand-new wind to handle.Fast will outdoor new wind how drop to the temperature of indoor needs or when outdoor temperature is hanged down, how to be rapidly heated winter in the key issue among this system and reach the temperature that the room requires.The invention has been adopted twice cooling and has been heated for twice and realized.Refrigeration is divided into pre-cold-peace deep cooling handles for twice, heating is divided into preheating and dark hot twice processing.
Process of refrigerastion is divided into twice handles, can control the stability of unit in running, key is the cold assignment problem how of two sections refrigeration.Among the invention,, pre-cold-peace deep cooling section is distributed by certain ratio row according to the refrigeration requirement (requirement of client) of unit.The evaporating temperature in precooling stage is controlled about 13~18 ℃, and the evaporating temperature control in deep cooling stage is about 7~10 ℃.(having certain difference) in different application scenarios
Among the process that heats, earlier outdoor air heat is arrived certain temperature range by preheating, be heated in the control temperature of customer requirements by dark heat then.
In control system, these innovation and creation adopt advanced DDC controller in conjunction with programming software, unique enthalpy according to each humiture correspondence, write a kind of enthalpy or enthalpy difference utilized and control compressor, the control program of temperature control heater, humidity control humidifier, its control block diagram is shown in figure two.Actual value and user's setting value that Temperature Humidity Sensor is sensed compare by the PID computing, and export a PID controlling value (PID value) and give executing agency, thus the running status of control unit.The calculation diagram of this control principle is as follows:
In the computing of reality, input is converted into the canonical variable of 0~10V, be about to set-point and process variables and be standardized into a magnitude of voltage between 0~10V.Simultaneously, guarantee that output also is 0~10V, a 2~10V or 4~20mA canonical variable.
Calculate one according to pid algorithm like this and output signal to executing agency, executing agency makes the control indoor temperature and humidity reach the purpose that precision air conditioner control requires according to the automatic adjustment of the signal realization operating states of the units of DDC input.
The refrigeration control procedure is as follows: set the enthalpy that the enthalpy of humiture correspondence is corresponding with the actual humiture behind the precooling zone after the precooling according to the user and pass through the PID computing, when the enthalpy of reality during greater than the enthalpy set, the PID controlling value of exporting 0~100% is given precooling zone, thus the refrigerating capacity of control precooling zone; When the enthalpy of reality during less than the enthalpy set, refrigeration unit is out of service.At deep cooling in the stage; The enthalpy that enthalpy and user by actual controlled indoor temperature and humidity correspondence sets the humiture correspondence is controlled the operation of deep cooling section through the PID controlling value of PID computing output, and when the enthalpy of reality during less than the enthalpy set, refrigeration unit is out of service; When the enthalpy of reality during, export one 0~100% PID controlling value, thereby the refrigerating capacity of control compressor makes temperature in the control room reach the temperature of user's setting greater than the enthalpy set.In refrigerating section, it is frequently fixed to select according to user's different demands, and frequency conversion or the helical-lobe compressor that has level to regulate realize that unit has grade energy adjustment or stepless energy adjustment.
Add thermal control: bringing-up section is divided into preheating section and dark hot arc, in preheating section, carries out computing by temperature after the setting preheating and actual temperature.When the temperature of reality during less than the temperature set, export a controlling value, heater according to ratio automatically adjusting add heat.In dark hot heating process, carry out computing by design temperature in the controlled chamber and actual temperature, when the temperature of reality during, export a controlling value less than setting value, regulate the dark hot heat that adds automatically; When the temperature of reality was higher than setting value, unit stopped heating.Among heating, can select electrical heating PTC to heat or Steam Heating according to client's different needs.Adopt the account form of this heating in two different, adopt electrical heating PTC to heat, its calculating is to adopt proportion control, output be a proportion control value; When adopting steam to heat, its account form is PID control, and the controlling value of output is the controlling value of a PID.
Humidification control: unit is set the humidity that humidity requirement in the controlled chamber and actual sensed device are sensed by the user, carries out the PID computing in controller.When the humidity of reality during greater than the humidity of needs, humidifier cuts out.When the humidity of reality during less than the humidity set, controller will be exported one 0~100% PID controlling value, control the humidification amount of unit.
The advantage of the invention is: the invention is a kind of precision air conditioner system that has adopted brand-new wind, has adopted advanced DDC control hardware in conjunction with PID (ratio, integration, differential) enthalpy difference algorithm among control system.Avoided in the control room can realizing the high-cleanness, high in the toilet owing to adopted air return system the situation of new return air air cross pollution of opening and shaft to occur.Adopt the advanced controller sampling period short, can realize the high accuracy control of toilet, saved the energy loss of unit in running.The DDC controller that this precision air conditioner control system is adopted can also realize detecting in real time on-the-spot various states, inquires about states such as humiture current and that set, carries out on-the-spot humiture and sets and various parameter control; Comprise and add thermal control, the control of humidifier aperture, compressor behavior control, the correction of sensor and timed power on/off; Monitor the running status of each parts, shut down and send functions such as alarm signal when breaking down.
Figure of description
Accompanying drawing below in conjunction with unit is further detailed:
Figure one is this innovation and creation machine set system schematic diagram;
Figure two is control logic block diagrams of this innovation and creation controller programming;
The specific embodiment
In schematic diagram one 1, the precooling zone evaporimeter; 2, preliminary treatment heater, 3, new wind screen pack; 4, new wind-warm syndrome humidity sensor, 5, device for drying and filtering; 6, compressor; 7, condenser; 8, electrode humidifler; 9 deep cooling section evaporimeters 10, depths reason heater; 11, blower fan; 12, pretreated Temperature Humidity Sensor; The Temperature Humidity Sensor of 13 controlled environments.
In figure two, only under the situation of indoor fan operation, other parts could turn round.Otherwise unit can not be opened.The control of refrigeration machine: only under the situation of the normal operation of blower fan, set the refrigerating capacity of the enthalpy of humiture correspondence and a PID controlling value control of the enthalpy process PID computing output precooling zone that the precooling zone sensor sensing arrives actual humiture correspondence by precooling zone in the DDC.The enthalpy of the humiture correspondence that the user sets in enthalpy by the actual humiture correspondence of controlled environment and the DDC carries out the operation of a pid value control of PID computing output deep cooling section.DDC adjusts the refrigerating capacity of unit automatically according to the pid value of output, makes unit reach the purpose of refrigeration or dehumidifier.
Add thermal control: according to the difference of mode of heating, its control form can the employing ratio be regulated control or PID adjusting control.When adopting electrical heating PTC to heat, its control form is a proportion control; When adopting steam to heat, its control form is PID control.The major control process is as follows; In pretreatment section the temperature of actual temperature of sensing and preliminary treatment setting is carried out ratio or PID calculating.When being higher than the preliminary treatment setting value, heater cuts out; When being lower than the temperature value that preliminary treatment sets, the result who calculates according to ratio or PID decides the heat that adds of preliminary treatment heater.At dark processing section the temperature of actual temperature of sensing and depths reason setting is contrasted.When being higher than depths reason setting value; Heater cuts out; When being lower than the temperature value that depths reason sets, the result who calculates according to ratio or PID decides the heat that adds of depths reason heater.
Humidification control; The humidification amount of humidifier is controlled by the aperture of humidifier, the aperture control of humidifier is carried out the PID computing by the humidity and the actual humidity according to indoor setting of DDC controller, output PID controlling value is controlled the aperture of humidifier, thereby has controlled the humidification amount of system.
Brand-new wind precision air conditioner system is by two groups of refrigeration systems and two groups of electrical heating PTC, an electrode humidifier, and blower fan is formed.Can select different air cleaners to satisfy the requirement of different cleanliness factors in the different toilets according to the requirement of control in addition.

Claims (6)

1, a kind of constant temperature and humidity precision air conditioner system that has adopted brand-new wind, what connect successively is new wind filter, chilldown system, pre-thermoelectric heater, cryogenic system, humidifier, dark thermoelectric heater and blower fan composition.Manage and realize by air being divided into preliminary treatment and depths, cold, heat between preliminary treatment and the depths reason distribute according to a certain percentage.
2, among these innovation and creation, carry out the PID computing, the PID controlling value of output 0~100% according to the enthalpy of the humiture correspondence of surveying and the enthalpy of setting humiture correspondence.As adopt frequency-changeable compressor, can realize that energy carries out stepless energy adjustment as required; The helical-lobe compressor that adopts invariable frequency compressor or progression to regulate can be realized grade energy adjustment that has of unit.
3, among these innovation and creation, can adopt electrical heating PTC to heat or Steam Heating at the heat form of preliminary treatment and depths reason.When adopting electrical heating PTC heating, its control procedure is a proportion control process; When adopting Steam Heating, its control procedure is the process of PID control.
4, according to the brand-new wind precision air conditioner of the described employing of claim 1 system, its control system adopts the PID programming Control of advanced DDC controller in conjunction with the advanced person, and its control output signal is 0~10V, the standard control signal of 2~10V or 4~20mA; Because the cycle of DDC sampling is short, can realize the high accuracy control of unit, reduced the energy consumption of unit in running.
5, according to claims 1,2, the refrigeration of this precision air conditioner is not to be controlled by temperature or humidity separately, but is controlled by the enthalpy of humiture correspondence.
6, according to above-mentioned claims, the humidification of this precision air conditioner system is to be controlled by the PID controlling value of DDC controller output, and heating is to be controlled by the proportion control value of DDC output.
CN 200410027488 2004-06-08 2004-06-08 Whole-fresh air precision air conditioning system Pending CN1707188A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102072561A (en) * 2011-02-16 2011-05-25 宁波锦海模具塑膠有限公司 Control method for warm air blower
CN101363647B (en) * 2007-08-08 2012-02-22 陈德 Integration full fresh air conditioner
CN102506488A (en) * 2011-10-20 2012-06-20 广东美的电器股份有限公司 Control method of air conditioner dehumidification mode control device
CN105172819A (en) * 2015-08-07 2015-12-23 中国北车集团大连机车研究所有限公司 Air-condition electronic control system for electric locomotive and control method thereof
CN106052053A (en) * 2016-06-23 2016-10-26 蔡贞贞 Clean room
CN106642589A (en) * 2016-12-30 2017-05-10 广东申菱环境系统股份有限公司 Enthalpy value control method of full fresh air constant-temperature constant-humidity unit
CN107355954A (en) * 2017-08-04 2017-11-17 上海吉荣空调科技有限公司 A kind of all-fresh air thermostatic constant wet control system and method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101363647B (en) * 2007-08-08 2012-02-22 陈德 Integration full fresh air conditioner
CN102072561A (en) * 2011-02-16 2011-05-25 宁波锦海模具塑膠有限公司 Control method for warm air blower
CN102506488A (en) * 2011-10-20 2012-06-20 广东美的电器股份有限公司 Control method of air conditioner dehumidification mode control device
CN102506488B (en) * 2011-10-20 2014-01-22 美的集团股份有限公司 Control method of air conditioner dehumidification mode control device
CN105172819A (en) * 2015-08-07 2015-12-23 中国北车集团大连机车研究所有限公司 Air-condition electronic control system for electric locomotive and control method thereof
CN105172819B (en) * 2015-08-07 2018-02-13 中国北车集团大连机车研究所有限公司 Use for electric locomotive air conditioner electric control system and its control method
CN106052053A (en) * 2016-06-23 2016-10-26 蔡贞贞 Clean room
CN106642589A (en) * 2016-12-30 2017-05-10 广东申菱环境系统股份有限公司 Enthalpy value control method of full fresh air constant-temperature constant-humidity unit
CN106642589B (en) * 2016-12-30 2020-02-14 广东申菱环境系统股份有限公司 Enthalpy value control method of full fresh air constant temperature and humidity unit
CN107355954A (en) * 2017-08-04 2017-11-17 上海吉荣空调科技有限公司 A kind of all-fresh air thermostatic constant wet control system and method

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Open date: 20051214