CN106642589B - Enthalpy value control method of full fresh air constant temperature and humidity unit - Google Patents

Enthalpy value control method of full fresh air constant temperature and humidity unit Download PDF

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Publication number
CN106642589B
CN106642589B CN201611255465.7A CN201611255465A CN106642589B CN 106642589 B CN106642589 B CN 106642589B CN 201611255465 A CN201611255465 A CN 201611255465A CN 106642589 B CN106642589 B CN 106642589B
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fresh air
enthalpy
enthalpy value
value
control method
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CN106642589A (en
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苏经校
林创辉
蔡乐坤
谢永健
陆思荣
吴东华
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Guangdong Shenling Environmental Systems Co Ltd
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Guangdong Shenling Environmental Systems Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/0001Control or safety arrangements for ventilation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/20Humidity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data

Abstract

The patent relates to an enthalpy value control method of a fresh air constant temperature and humidity unit, wherein the unit comprises a plurality of precooling systems and recooling systems; the enthalpy value control method comprises the following steps: detecting the temperature and humidity of fresh air, calculating the enthalpy value of the fresh air, comparing the enthalpy value of the fresh air with the preset enthalpy value after pretreatment, and judging the number of precooling systems needing to be started; the fresh air firstly passes through the precooling systems and then passes through the recooling system, and finally enters the room. This patent is through comparing new trend enthalpy value and behind the preset preliminary treatment enthalpy value, and the reasonable selection preheats the system and opens quantity, has also saved the energy consumption when fully preheating the new trend.

Description

Enthalpy value control method of full fresh air constant temperature and humidity unit
Technical Field
The patent relates to the field of enthalpy value control, in particular to an enthalpy value control method of a fresh air constant temperature and humidity unit.
Background
The full fresh air constant temperature and humidity unit is an air conditioning device for providing fresh air, can achieve the function of constant temperature and humidity or simply provide fresh air according to the requirements of the use environment, and has the working principle that fresh air is extracted outdoors, is sent indoors through a fan after being subjected to dust removal, dehumidification (or humidification), temperature reduction (or heating) and the like, and replaces the original indoor air.
At present, the conventional temperature and humidity control is adopted for all fresh air constant-temperature and constant-humidity units, when the working conditions of a room meet the set requirements, the compressor stops running, but the fan still runs at the moment, the outdoor unprocessed fresh air working conditions are probably led into the room, and the temperature and the humidity in the room are greatly impacted.
The patent application publication No. CN1707188A provides a full fresh air precision air conditioning system, which comprises a fresh air filter, a precooling system, a preheating electric heater, a deep cooling system, a humidifier, a deep thermoelectric heater and a fan which are connected in sequence, wherein the system is realized by dividing air into pretreatment and deep treatment, and the cold quantity and the heat quantity between the pretreatment and the deep treatment are distributed according to a certain proportion. The refrigeration control process is as follows: performing PID (proportion integration differentiation) operation according to an enthalpy value corresponding to the temperature and humidity after precooling set by a user and an enthalpy value corresponding to the actual temperature and humidity after the precooling section, and outputting a PID control value of 0-100% to the precooling section when the actual enthalpy value is greater than the set enthalpy value, so as to control the refrigerating capacity of the precooling section; and when the actual enthalpy value is smaller than the set enthalpy value, the refrigerating unit stops running. In the cryogenic stage; controlling the operation of a deep cooling section through a PID control value output by PID operation according to an enthalpy value corresponding to the actual temperature and humidity in the controlled room and an enthalpy value corresponding to the temperature and humidity set by a user, and stopping the operation of a refrigerating unit when the actual enthalpy value is smaller than the set enthalpy value; and when the actual enthalpy value is larger than the set enthalpy value, outputting a PID control value of 0-100 percent so as to control the refrigerating capacity of the compressor and enable the temperature in the control room to reach the temperature set by a user.
Although the refrigerating capacity of the pre-cooling section and the refrigerating capacity of the deep cooling section can be flexibly adjusted, whether the refrigerating unit of the pre-cooling section can meet the refrigerating requirement is ignored, particularly, under the environment with severe fresh air working conditions, one refrigerating unit may not be enough to enable the enthalpy value corresponding to the temperature and the humidity of the pre-cooled fresh air to reach the enthalpy value set by a user, so that the refrigerating unit is overloaded to operate and breaks down, and the reliability is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the patent provides an enthalpy value control method of a fresh air constant temperature and humidity unit, which can fully pre-cool fresh air and has high reliability.
For the present patent, the above technical problem is solved as follows: an enthalpy value control method of a fresh air constant temperature and humidity unit comprises a plurality of precooling systems and recooling systems; the enthalpy value control method comprises the following steps:
s1: detecting the temperature and humidity of fresh air, calculating the enthalpy value of the fresh air, comparing the enthalpy value of the fresh air with the preset enthalpy value after pretreatment, and judging the number of precooling systems needing to be started;
s2: the fresh air firstly passes through the precooling systems and then passes through the recooling system, and finally enters the room.
This patent selects the quantity of opening the precooling system according to actual conditions, accurately carries out the preliminary treatment to the new trend effectively, and the energy can be saved, and adaptability is good, and a plurality of precooling systems function simultaneously, guarantee that the new trend can obtain abundant preliminary treatment, and the reliability is high.
Further, the enthalpy value after pretreatment preset in the step S1 is set according to the fresh air condition.
The fresh air working condition refers to that fresh air introduced into a room is processed to an enthalpy value required indoors, namely, the enthalpy value after pretreatment is set according to the enthalpy value required indoors, so that the fresh air entering the room cannot impact indoor air, and the fresh air processing system is high in reliability and good in adaptability.
Further, the refrigeration parameters of the pre-cooling system in step S1 are designed according to fresh air conditions.
The refrigeration parameters refer to the structures of a compressor, a heat exchanger and other devices in the precooling system, the internal structure of the precooling system is reasonably set according to the fresh air working condition, so that the fresh air is more fully pretreated, the enthalpy value of the fresh air meets the preset enthalpy value requirement after pretreatment, and the precooling effect is good.
Further, presetting a value range of a difference value obtained by subtracting the enthalpy value of fresh air from the enthalpy value after the preset pretreatment, dividing the value range of the difference value into a plurality of intervals, and correspondingly starting different numbers of precooling systems in each interval; the comparison process in step S1 is to subtract the enthalpy value of the fresh air from the enthalpy value after the pre-treatment set in advance to calculate a difference value, and determine an interval to which the calculated difference value belongs, and the interval to which the difference value belongs starts a corresponding number of precooling systems.
Further, the number of the intervals corresponds to the number of the precooling systems.
Further, the start and stop of the sub-cooling system are controlled according to whether the indoor air meets the enthalpy requirement of the indoor air or not.
If the indoor air has met the enthalpy requirement, stopping the sub-cooling system; if not, starting the recooling system; energy consumption is saved, meanwhile, the continuous operation of the recooling system is prevented from being failed, and the reliability is high.
Further, the temperature and humidity of the fresh air in the step S1 are detected by a temperature probe and a humidity probe.
Further, the number of the precooling systems is two or three.
Be different from prior art, the beneficial effect of this patent is:
this patent is through setting up a plurality of precooling systems to the new trend enthalpy value after the comparison preliminary treatment and the new trend enthalpy value of preset control the quantity of precooling system, guarantee the abundant precooling of new trend, reach the preliminary treatment requirement, the energy has also been practiced thrift when adaptability is good, the reliability is high.
Drawings
Fig. 1 is a flowchart illustrating a method for determining the number of times a precooling system is turned on.
Fig. 2 is a flow chart of the fresh air processing of the present patent.
Detailed Description
The enthalpy control method for the fresh air constant temperature and humidity unit shown in fig. 1 and 2 includes a plurality of precooling systems and a plurality of recooling systems; the enthalpy value control method comprises the following steps:
s1: detecting the temperature and humidity of fresh air through a temperature probe and a humidity probe, calculating the enthalpy value of the fresh air, comparing the enthalpy value of the fresh air with the preset enthalpy value after pretreatment, and judging the number of precooling systems needing to be started;
s2: the fresh air firstly passes through the precooling systems and then passes through the recooling system, and finally enters the room.
This patent selects the quantity of opening the precooling system according to actual conditions, accurately carries out the preliminary treatment to the new trend effectively, and the energy can be saved, and adaptability is good, and a plurality of precooling systems function simultaneously, guarantee that the new trend can obtain abundant preliminary treatment, and the reliability is high.
And the enthalpy value after pretreatment preset in the step S1 is set according to the fresh air working condition.
The fresh air working condition refers to that fresh air introduced into a room is processed to an enthalpy value required indoors, namely, the enthalpy value after pretreatment is set according to the enthalpy value required indoors, so that the fresh air entering the room cannot impact indoor air, and the fresh air processing system is high in reliability and good in adaptability.
And the refrigeration parameters of the precooling system in the step S1 are designed according to the fresh air working condition.
The refrigeration parameters refer to the structures of a compressor, a heat exchanger and other devices in the precooling system, and the internal structure of the precooling system is reasonably set according to the fresh air working condition, so that the fresh air is more fully pretreated, the enthalpy value of the fresh air after pretreatment meets the preset enthalpy value requirement after pretreatment, and the precooling effect is improved.
Presetting a value range of a difference value obtained by subtracting the enthalpy value of fresh air from the enthalpy value after the preset pretreatment, dividing the value range of the difference value into a plurality of intervals, and correspondingly starting precooling systems with different quantities in each interval; the comparison process in step S1 is to subtract the enthalpy value of the fresh air from the enthalpy value after the pre-treatment set in advance to calculate a difference value, and determine an interval to which the calculated difference value belongs, and the interval to which the difference value belongs starts a corresponding number of precooling systems.
The number of the intervals corresponds to the number of the pre-cooling systems, and in a specific implementation process, the number of the intervals can be set to 2 or 3.
The start and stop of the recooling system are controlled according to whether the indoor air meets the enthalpy requirement of the indoor air, and if the indoor air meets the enthalpy requirement, the recooling system is stopped; if not, starting the recooling system; energy consumption is saved, meanwhile, the continuous operation of the recooling system is prevented from being failed, and the reliability is high.

Claims (6)

1. An enthalpy value control method of a full fresh air constant temperature and humidity unit comprises a precooling system and a recooling system, and is characterized in that the number of the precooling systems is multiple; the enthalpy value control method comprises the following steps:
s1: detecting the temperature and humidity of fresh air, calculating the enthalpy value of the fresh air, comparing the enthalpy value of the fresh air with the enthalpy value after pretreatment set in advance, and judging the number of precooling systems needing to be started:
s2: fresh air firstly passes through a plurality of precooling systems, then passes through a recooling system and finally enters the room;
presetting the value range of a difference value obtained by subtracting the enthalpy value of fresh air from the enthalpy value after pretreatment, dividing the value range of the difference value into a plurality of intervals, and correspondingly starting precooling systems with different quantities in each interval: the comparison process in the step S1 is to subtract the enthalpy value of the fresh air from the enthalpy value after the preset pretreatment to calculate a difference value, and determine an interval to which the calculated difference value belongs, and the interval to which the difference value belongs starts a corresponding number of precooling systems;
the number of intervals corresponds to the number of pre-cooling systems.
2. The enthalpy control method of the whole fresh air constant temperature and humidity unit according to claim 1, wherein the pre-processed enthalpy preset in step S1 is set according to fresh air conditions.
3. The enthalpy control method for the whole fresh air constant temperature and humidity unit according to claim 1, wherein the refrigeration parameters of the pre-cooling system in the step S1 are designed according to fresh air conditions.
4. The enthalpy control method for the fresh air constant-temperature and constant-humidity unit according to any one of claims 1 to 3, wherein starting and stopping of the sub-cooling system are controlled according to whether indoor air meets enthalpy requirements of the indoor air.
5. The enthalpy control method for the fresh air constant temperature and humidity unit according to any one of claims 1 to 3, wherein the temperature and humidity of the fresh air in the step S1 are detected by a temperature probe and a humidity probe.
6. The enthalpy value control method for the whole fresh air constant temperature and humidity unit according to any one of claims 1 to 3, wherein the number of the precooling systems is two or three.
CN201611255465.7A 2016-12-30 2016-12-30 Enthalpy value control method of full fresh air constant temperature and humidity unit Active CN106642589B (en)

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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
CN108168052B (en) * 2017-12-27 2020-01-31 江苏联宏智慧能源股份有限公司 optimal start-stop control method for central air-conditioning refrigeration system

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Publication number Priority date Publication date Assignee Title
CN2684070Y (en) * 2004-03-22 2005-03-09 东莞市广大制冷有限公司 Module control precision air conditioning system
CN1707188A (en) * 2004-06-08 2005-12-14 东莞市广大制冷有限公司 Whole-fresh air precision air conditioning system
CN202581623U (en) * 2012-03-19 2012-12-05 上海理工大学 Humidity independent control fresh air processor for radiation air-conditioning system

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US9097432B2 (en) * 2010-01-12 2015-08-04 Honeywell International Inc. Economizer control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2684070Y (en) * 2004-03-22 2005-03-09 东莞市广大制冷有限公司 Module control precision air conditioning system
CN1707188A (en) * 2004-06-08 2005-12-14 东莞市广大制冷有限公司 Whole-fresh air precision air conditioning system
CN202581623U (en) * 2012-03-19 2012-12-05 上海理工大学 Humidity independent control fresh air processor for radiation air-conditioning system

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