CN106594965B - A kind of Fresh air handing control method and system based on air enthalpy - Google Patents
A kind of Fresh air handing control method and system based on air enthalpy Download PDFInfo
- Publication number
- CN106594965B CN106594965B CN201610977268.XA CN201610977268A CN106594965B CN 106594965 B CN106594965 B CN 106594965B CN 201610977268 A CN201610977268 A CN 201610977268A CN 106594965 B CN106594965 B CN 106594965B
- Authority
- CN
- China
- Prior art keywords
- air
- fresh air
- sup
- temperature
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 154
- 238000012545 processing Methods 0.000 claims description 29
- 238000004134 energy conservation Methods 0.000 claims description 12
- 239000008400 supply water Substances 0.000 claims description 12
- 230000001143 conditioned effect Effects 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000008014 freezing Effects 0.000 abstract 2
- 238000007710 freezing Methods 0.000 abstract 2
- 238000004378 air conditioning Methods 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009123 feedback regulation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a kind of Fresh air handing control method and system based on air enthalpy, method includes the following steps: the temperature of air enthalpy and Fresh air handling units outside S1, collection room, it is calculated simultaneously according to the calculation formula of air enthalpy, indoor sends on air enthalpy to obtain to be sent into advance；S2, according to outdoor air enthalpy collected and be calculated send on air enthalpy and law of conservation of energy establishes thermal balance equation；The freezing water demand of Fresh air handling units, and the unlatching ratio of the chilled water pipe valve according to the freezing water demand control Fresh air handling units for the Fresh air handling units being calculated are calculated, according to thermal balance equation to adjust the water flow of chilled water；S4, step S1 was repeated once to step S3 every T minutes, wherein T is positive number.The present invention realizes to the real-time control of chilled-water flow by real-time monitoring air enthalpy and Fresh air handling units chilled water supply and return water temperature and law of conservation of energy, reaches energy-efficient purpose.
Description
Technical Field
The invention relates to the technical field of central air conditioners, in particular to a fresh air processing control method and a fresh air processing control system based on an air enthalpy value.
Background
In China, the total energy consumption of buildings in 2014 exceeds 12.5 hundred million tons of standard coal, and accounts for 30 percent of the total social energy consumption. The energy consumption of the central air conditioner accounts for 65% of the total energy consumption of the building, wherein the energy consumption of the air conditioner room accounts for about 70% of the energy consumption of the air conditioning system. The introduction of outdoor fresh air into an air conditioning system is the key to ensure good indoor air quality. When the outdoor air enthalpy value and the air temperature are higher than the indoor air enthalpy value and the air temperature in summer, the air conditioning system is required to be consumed for processing fresh air. In southern areas of our country, especially in subtropical warm areas, a considerable part of the energy consumption of central air conditioning systems is used for outdoor fresh air treatment. The conventional central air conditioning system generally adopts a supply mode of setting fresh air to meet the corresponding indoor area and the minimum fresh air requirement of personnel, and does not pay attention to the air state (such as air enthalpy value) of the treated fresh air. Especially in transitional seasons (such as spring and autumn), because the enthalpy of indoor and outdoor air cannot be effectively and accurately monitored in time, fresh air cannot be well provided, energy waste is caused, and the purpose of energy conservation cannot be achieved.
Disclosure of Invention
The invention aims to solve the technical problems that the prior art cannot effectively and accurately monitor the enthalpy value of indoor and outdoor air in time, cannot provide fresh air well, causes energy waste and cannot achieve the aim of energy saving, and provides a fresh air processing control method and system based on the enthalpy value of the air.
The technical scheme adopted by the invention for solving the technical problems is as follows: a fresh air processing control method based on air enthalpy is constructed, and the method comprises the following steps:
s1, acquiring the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculating according to a calculation formula of the air enthalpy value to obtain the enthalpy value of the pre-feeding air which is pre-fed into the room;
s2, establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated pre-feeding air enthalpy value and the energy conservation law;
s3, calculating the chilled water demand of the fresh air handling unit according to the heat balance equation, and controlling the opening ratio of a chilled water pipe valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit so as to adjust the water flow of chilled water;
s4, repeating the steps S1 to S3 every T minutes, wherein T is a positive number.
In the fresh air handling control method based on air enthalpy according to the present invention, preferably, in step S1, the outdoor air enthalpy is collected by an air enthalpy sensor.
In the fresh air handling control method based on air enthalpy value according to the present invention, preferably, in step S1, the acquiring the temperature of the fresh air handling unit includes:
and collecting the water supply temperature in a water supply pipe and the water return temperature in a water return pipe of the chilled water of the fresh air handling unit.
In the fresh air handling control method based on air enthalpy according to the present invention, preferably, in step S1, the calculation formula of the air enthalpy is:
iin，sup＝(1.01+1.84din，sup)tin，sup+2500din，sup
wherein,
iin，sup: representing the enthalpy value of pre-feeding air in a pre-feeding chamber of the fresh air handling unit;
din，sup: representing the moisture content of the air processed by the fresh air unit;
tin，sup: the air temperature at the air supply port of the fresh air handling unit is shown.
In the fresh air processing control method based on the air enthalpy value of the present invention, preferably, in the calculation formula of the air enthalpy value, the moisture content of the air processed by the fresh air handling unit is obtained by the following formula:
Pin，sup＝0.07394tin，sup 3-0.2556tin，sup 2+62.49tin，sup+581.9
wherein,
RHin，sup: indicating the relative humidity of the air pre-fed into the chamber;
Pin，sup: indicating the air pressure of the air pre-fed into the chamber.
In the fresh air processing control method based on the air enthalpy value, preferably, the relative humidity RH of the air pre-fed into the roomin,supAdopting a preset relative humidity; the preset relative humidity is 90-95%.
In the fresh air processing control method based on the air enthalpy value, preferably, the air temperature t at the air supply port of the fresh air handling unitin,supAdopting a preset temperature; the preset temperature is 17-19 ℃.
In the fresh air handling control method based on air enthalpy value according to the present invention, preferably, the heat balance equation is:
F·Δi＝C·M·ΔT
Δi＝(iout-iin,sup)
ΔT＝Tsup-Trtn
wherein,
Δ i: representing the difference between the outdoor air enthalpy and the pre-feed air enthalpy;
f: representing the fresh air volume;
m: indicating the demand of chilled water;
Δ T: the difference value of the supply water temperature and the return water temperature of the chilled water is represented;
Tsup: represents the supply water temperature of the chilled water;
Trtn: representing the return water temperature of the chilled water;
c: represents the specific heat capacity of water.
The invention also provides a fresh air processing control system based on the air enthalpy value, which comprises:
the collection unit is used for collecting the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculation is carried out according to a calculation formula of the air enthalpy value so as to obtain the air enthalpy value which is pre-fed into the room;
the modeling unit is used for establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated air enthalpy value which is pre-fed into the room and the energy conservation law;
the processing control unit is used for calculating the chilled water demand of the fresh air handling unit according to the heat balance equation, and controlling the opening ratio of a chilled water pipeline valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit so as to adjust the water flow of chilled water;
and the repeated execution unit is used for repeating the steps executed by the acquisition unit, the modeling unit and the processing control unit every T minutes, wherein T is a positive number.
The fresh air processing control method and the fresh air processing control system based on the air enthalpy value have the following beneficial effects: according to the invention, the outdoor and indoor air enthalpy values, the chilled water supply temperature and the return water temperature of the fresh air handling unit are monitored in real time, the actual chilled water demand of the fresh air handling unit is obtained according to the law of energy conservation, and the opening ratio of the chilled water pipe valve is further controlled, so that the chilled water flow is controlled, and the aim of saving energy of a central air conditioning fresh air system is finally fulfilled on the premise of ensuring the indoor air quality.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow diagram of a fresh air treatment control method based on air enthalpy according to the present invention;
fig. 2 is a schematic structural diagram of a preferred embodiment of the fresh air handling control system based on enthalpy of air according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The fresh air processing control method and the fresh air processing control system based on the air enthalpy are suitable for the field of energy conservation of the central air conditioner, the opening ratio of a chilled water pipeline valve of a fresh air unit is controlled in real time by monitoring the indoor and outdoor air enthalpy in real time, further the control on the chilled water flow is realized, the air supply quantity is adjusted in time, unnecessary air quantity conveying is reduced, and the aim of saving energy of the fresh air system of the central air conditioner is finally realized on the premise of ensuring the indoor air quality.
As shown in fig. 1, a schematic flow chart of a fresh air processing control method based on air enthalpy according to the present invention is shown, and the method includes the following steps:
s1, acquiring the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculating according to a calculation formula of the air enthalpy value to obtain the enthalpy value of the pre-feeding air which is pre-fed into the room;
s2, establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated pre-feeding air enthalpy value and the energy conservation law;
s3, calculating the chilled water demand of the fresh air handling unit according to the heat balance equation, and controlling the opening ratio of a chilled water pipe valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit so as to adjust the water flow of chilled water;
s4, repeating the steps S1 to S3 every T minutes, wherein T is a positive number.
Preferably, in step S1, the outdoor air enthalpy is collected by an air enthalpy sensor. It is understood that the enthalpy of air refers to the amount of heat insulation the air contains. In the embodiment of the invention, an air enthalpy sensor can be added at the corresponding monitoring point to monitor the outdoor air enthalpy in real time, and the measured air enthalpy is uploaded to the central processing unit, so that the outdoor air enthalpy can be directly extracted and monitored in real time in the subsequent steps. In the embodiment of the present invention, the air enthalpy sensor may be selected from air enthalpy sensors known to those skilled in the art, and the specific type of the air enthalpy sensor is not limited by the present invention.
Further, in step S1, the acquiring the temperature of the fresh air handling unit includes:
the water supply temperature in the water supply pipe and the return water temperature in the return water pipe of the chilled water of the fresh air handling unit are collected. Preferably, in an embodiment of the present invention, the temperature of the supplied water in the water supply pipe and the temperature of the returned water in the water return pipe are collected by temperature sensors. It can be understood that the acquisition of the supply water temperature and the return water temperature of the chilled water of the fresh air handling unit may be performed once every several minutes, for example, data of the supply water temperature and the return water temperature may be acquired once every 5 minutes, every 4 minutes, or every 3 minutes, and the specific selection of the number of minutes may be determined according to the actually used equipment and the operation time, which is not limited in the present invention. The water supply temperature and the return water temperature of the chilled water of the fresh air handling unit are collected every few minutes, so that the water supply temperature and the return water temperature of the chilled water of the fresh air handling unit can be monitored in real time, and the actual condition of the chilled water of the fresh air handling unit can be mastered. Further, in the embodiment of the present invention, the temperature sensors used for testing the water temperatures in the water supply pipe and the water return pipe of the chilled water of the fresh air handling unit may be temperature sensors known to those skilled in the art, and the type of the temperature sensors is not particularly limited in the present invention.
Specifically, the calculation formula of the air enthalpy value is as follows:
iin,sup＝(1.01+1.84din,sup)tin,sup+2500din，sup
wherein,
iin，sup: representing the enthalpy value of pre-feeding air in a pre-feeding chamber of the fresh air handling unit;
din，sup: representing the moisture content of the air processed by the fresh air unit;
tin，sup: the air temperature at the air supply port of the fresh air handling unit is shown.
In addition, in the calculation formula of the air enthalpy value, the moisture content of the air processed by the fresh air handling unit is obtained by the following formula:
P＝0.07394tin，sup 3-0.2556tin，sup 2+62.49tin，sup+581.9
wherein,
RHin，sup: indicating the relative humidity of the air pre-fed into the chamber;
Pin，sup: indicating the air pressure of the air pre-fed into the chamber.
Understandably, the enthalpy value of the pre-feeding air into the room of the fresh air fan set can be converted according to the formula.
Preferably, in an embodiment of the invention, the relative humidity RH of the air pre-fed into the chamber isin，supThe preset relative humidity is adopted and is 90-95%.
Preferably, in the practice of the present inventionIn the embodiment, the air temperature t at the air supply port of the fresh air handling unitin，supAdopting a preset temperature, wherein the preset temperature is 17-19 ℃.
Preferably, in the embodiment of the present invention, the specific formula of the heat balance equation is:
F·Δi＝C·M·ΔT
Δi＝(iout-iin，sup)
ΔT＝Tsup-Trtn
wherein,
Δ i: representing the difference between the outdoor air enthalpy and the pre-feed air enthalpy;
f: representing the fresh air volume;
m: indicating the demand of chilled water;
Δ T: the difference value of the supply water temperature and the return water temperature of the chilled water is represented;
Tsup: represents the supply water temperature of the chilled water;
Trtn: representing the return water temperature of the chilled water;
c: represents the specific heat capacity of water.
Understandably, the actual demand of the chilled water of the fresh air fan unit can be converted according to a heat balance equation, namely:
the fresh air processing control method based on the air enthalpy value can be understood by monitoring the outdoor air enthalpy value in real time by using the air enthalpy value sensor, monitoring the chilled water supply temperature and the return water temperature of the fresh air handling unit in real time by using the temperature sensor, and converting the actual chilled water demand of the fresh air handling unit according to the energy conservation law, so that the valve opening ratio of the chilled water pipe of the fresh air handling unit is controlled by feedback regulation according to the actual chilled water demand of the fresh air handling unit obtained by calculation, the water flow control of the chilled water of the fresh air handling unit is realized, and the aim of finally realizing energy saving of a central air conditioning fresh air system is fulfilled on the premise of ensuring the indoor air quality.
In addition, in the embodiment of the invention, the steps from the step S1 to the step S2 are repeatedly executed every T minutes, so that the water flow of the chilled water of the fresh air handling unit is dynamically controlled in real time, and the purpose of saving energy of the fresh air handling system is achieved. Wherein, T is a positive number, and the specific numerical value needs to be selected and determined according to the actual application requirement. The invention is not limited in this regard.
The fresh air processing control method based on the air enthalpy value provides a fast and simple technical scheme for controlling the flow rate of chilled water of a fresh air system of a central air conditioner on site, namely, an air enthalpy value sensor is arranged at a corresponding monitoring point at the inlet of a fresh air unit, an air temperature sensor and a relative humidity sensor are arranged at the air outlet of the fresh air unit at the same time, the enthalpy value of outdoor air and the air temperature and the relative humidity in fresh air which is pre-fed into a room are monitored in real time, so that the opening ratio of a valve of a chilled water pipe is controlled by calculating the demand of the chilled water of the fresh air unit according to the law of energy conservation, for example, when data collected by the temperature sensor and the relative humidity sensor at the air outlet further realize the control of the flow rate of the chilled water of the fresh air unit, the real-time condition of the chilled water supply of the fresh air unit is monitored in real time, and the real-time dynamic control of the chilled water, finally, the aim of saving energy of the fresh air processing system is fulfilled.
As shown in fig. 2, a fresh air handling control system based on air enthalpy according to the present invention comprises:
the collection unit 100 is used for collecting the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculation is carried out according to a calculation formula of the air enthalpy value so as to obtain the air enthalpy value which is pre-fed into the room.
And the modeling unit 200 is used for establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated air enthalpy value which is pre-fed into the room and the energy conservation law.
And the processing control unit 300 is configured to calculate a chilled water demand of the fresh air handling unit according to a heat balance equation, and control an opening ratio of a chilled water pipe valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit, so as to adjust a water flow rate of chilled water.
And a repeat execution unit 400 for repeating the steps performed by the acquisition unit 100, the modeling unit 200, and the process control unit 300 every T minutes, where T is a positive number.
Specifically, the outdoor air enthalpy value collected by the collection unit 100 can be obtained by using an air enthalpy sensor to perform a spoon. It is understood that the enthalpy of air refers to the amount of heat insulation the air contains. In the embodiment of the invention, an air enthalpy sensor can be added at the corresponding monitoring point to monitor the outdoor air enthalpy in real time, and the measured air enthalpy is uploaded to the central processing unit, so that the outdoor air enthalpy can be directly extracted and monitored in real time in the subsequent steps. In the embodiment of the present invention, the air enthalpy sensor may be selected from air enthalpy sensors known to those skilled in the art, and the specific type of the air enthalpy sensor is not limited by the present invention.
Further, the temperature of the fresh air handling unit collected by the collection unit 100 includes: the water supply temperature in the water supply pipe and the return water temperature in the return water pipe of the chilled water of the fresh air handling unit are collected. Preferably, in an embodiment of the present invention, the temperature of the supplied water in the water supply pipe and the temperature of the returned water in the water return pipe are collected by temperature sensors. It can be understood that the acquisition of the supply water temperature and the return water temperature of the chilled water of the fresh air handling unit may be performed once every several minutes, for example, data of the supply water temperature and the return water temperature may be acquired once every 5 minutes, every 4 minutes, or every 3 minutes, and the specific selection of the number of minutes may be determined according to the actually used equipment and the operation time, which is not limited in the present invention. The water supply temperature and the return water temperature of the chilled water of the fresh air handling unit are collected every few minutes, so that the water supply temperature and the return water temperature of the chilled water of the fresh air handling unit can be monitored in real time, and the actual condition of the chilled water of the fresh air handling unit can be mastered. Further, in the embodiment of the present invention, the temperature sensors used for testing the water temperatures in the water supply pipe and the water return pipe of the chilled water of the fresh air handling unit may be temperature sensors known to those skilled in the art, and the type of the temperature sensors is not particularly limited in the present invention.
Specifically, the calculation formula of the air enthalpy value adopted in the acquisition unit 100 is as follows:
iin，sup＝(1.01+1.84din,sup)tin,sup+2500din,sup
wherein,
iin,sup: representing the enthalpy value of pre-feeding air in a pre-feeding chamber of the fresh air handling unit;
din,sup: representing the moisture content of the air processed by the fresh air unit;
tin,sup: the air temperature at the air supply port of the fresh air handling unit is shown.
In addition, in the calculation formula of the air enthalpy value, the moisture content of the air processed by the fresh air handling unit is obtained by the following formula:
P＝0.07394tin，sup 3-0.2556tin，sup 2+62.49tin，sup+581.9
wherein,
RHin，sup: indicating the relative humidity of the air pre-fed into the chamber;
Pin，sup: indicating the air pressure of the air pre-fed into the chamber.
Understandably, the enthalpy value of the pre-feeding air into the room of the fresh air fan set can be converted according to the formula.
Preferably, in an embodiment of the invention, the relative humidity RH of the air pre-fed into the chamber isin，supThe preset relative humidity is adopted and is 90-95%.
Preferably, in the embodiment of the invention, the air temperature t at the air supply opening of the fresh air handling unitin，supAdopting a preset temperature, wherein the preset temperature is 17-19 ℃.
Preferably, in the embodiment of the present invention, the specific formula of the heat balance equation is:
F·Δi＝C·M·ΔT
Δi＝(iout-iin，sup)
ΔT＝Tsup-Trtn
wherein,
Δ i: representing the difference between the outdoor air enthalpy and the pre-feed air enthalpy;
f: representing the fresh air volume;
m: indicating the demand of chilled water;
Δ T: the difference value of the supply water temperature and the return water temperature of the chilled water is represented;
Tsup: represents the supply water temperature of the chilled water;
Trtn: representing the return water temperature of the chilled water;
c: represents the specific heat capacity of water.
Understandably, the actual demand of the chilled water of the fresh air fan unit can be converted according to a heat balance equation, namely:
the fresh air processing control method based on the air enthalpy value can be understood by monitoring the outdoor air enthalpy value in real time by using the air enthalpy value sensor, monitoring the chilled water supply temperature and the return water temperature of the fresh air handling unit in real time by using the temperature sensor, and converting the actual chilled water demand of the fresh air handling unit according to the energy conservation law, so that the valve opening ratio of the chilled water pipe of the fresh air handling unit is controlled by feedback regulation according to the actual chilled water demand of the fresh air handling unit obtained by calculation, the water flow control of the chilled water of the fresh air handling unit is realized, and the aim of finally realizing energy saving of a central air conditioning fresh air system is fulfilled on the premise of ensuring the indoor air quality.
In addition, in the embodiment of the present invention, the steps performed by the acquisition unit 100, the modeling unit 200, and the process control unit 300 are repeatedly performed by the execution unit 400. The method can be understood to be repeatedly executed every T minutes, so that the real-time dynamic control of the flow rate of the chilled water of the fresh air handling unit can be realized, and the aim of saving energy of the fresh air handling system is fulfilled. Wherein, T is a positive number, and the specific numerical value needs to be selected and determined according to the actual application requirement. The invention is not limited in this regard.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. A fresh air processing control method based on air enthalpy is characterized by comprising the following steps:
s1, acquiring the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculating according to a calculation formula of the air enthalpy value to obtain the enthalpy value of the pre-feeding air which is pre-fed into the room; the outdoor air enthalpy is collected through an air enthalpy sensor;
s2, establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated pre-feeding air enthalpy value and the energy conservation law;
s3, calculating the chilled water demand of the fresh air handling unit according to the heat balance equation, and controlling the opening ratio of a chilled water pipe valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit so as to adjust the water flow of chilled water;
s4, repeating the steps S1 to S3 every T minutes, wherein T is a positive number.
2. The air enthalpy value-based fresh air handling control method according to claim 1, wherein in the step S1, the collecting the temperature of the fresh air handling unit includes:
and collecting the water supply temperature in a water supply pipe and the water return temperature in a water return pipe of the chilled water of the fresh air handling unit.
3. The fresh air handling control method according to claim 2, wherein in step S1, the air enthalpy value is calculated by the formula:
iin,sup＝(1.01+1.84din,sup)tin,sup+2500din,sup
wherein,
iin,sup: representing the enthalpy value of pre-feeding air in a pre-feeding chamber of the fresh air handling unit;
din,sup: representing the moisture content of the air processed by the fresh air unit;
tin,sup: the air temperature at the air supply port of the fresh air handling unit is shown.
4. The fresh air processing control method based on the air enthalpy value, according to the claim 3, characterized in that in the calculation formula of the air enthalpy value, the moisture content of the air processed by the fresh air handling unit is obtained by the following formula:
P＝0.07394tin，sup 3-0.2556tin，sup 2+62.49tin，sup+581.9
wherein,
RHin,sup: indicating the relative humidity of the air pre-fed into the chamber;
Pin,sup: indicating the air pressure of the air pre-fed into the chamber.
5. The method of claim 4, wherein the relative humidity RH of the pre-conditioned air is greater than the relative humidity RH of the pre-conditioned airin,supAdopting a preset relative humidity; the preset relative humidity is 90-95%.
6. The air enthalpy value-based fresh air handling control method according to claim 5, wherein the air temperature t at the air supply port of the fresh air handling unitin,supAdopting a preset temperature; the preset temperature is 17-19 ℃.
7. The fresh air handling control method based on air enthalpy according to claim 6, wherein the heat balance equation is:
F·Δi＝C·M·ΔT
Δi＝(iout-iin,sup)
ΔT＝Tsup-Trtn
wherein,
Δ i: representing the difference between the outdoor air enthalpy and the pre-feed air enthalpy;
f: representing the fresh air volume;
m: indicating the demand of chilled water;
Δ T: the difference value of the supply water temperature and the return water temperature of the chilled water is represented;
Tsup: represents the supply water temperature of the chilled water;
Trtn: representing the return water temperature of the chilled water;
c: represents the specific heat capacity of water;
iout: representing the outdoor air enthalpy.
8. The utility model provides a fresh air processing control system based on air enthalpy value which characterized in that includes:
the collection unit is used for collecting the outdoor air enthalpy value and the temperature of the fresh air handling unit, and meanwhile, calculation is carried out according to a calculation formula of the air enthalpy value so as to obtain the air enthalpy value which is pre-fed into the room;
the modeling unit is used for establishing a heat balance equation according to the acquired outdoor air enthalpy value, the calculated air enthalpy value which is pre-fed into the room and the energy conservation law;
the processing control unit is used for calculating the chilled water demand of the fresh air handling unit according to the heat balance equation, and controlling the opening ratio of a chilled water pipe valve of the fresh air handling unit according to the calculated chilled water demand of the fresh air handling unit so as to adjust the water flow of chilled water;
and the repeated execution unit is used for repeating the steps executed by the acquisition unit, the modeling unit and the processing control unit every T minutes, wherein T is a positive number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610977268.XA CN106594965B (en) | 2016-11-04 | 2016-11-04 | A kind of Fresh air handing control method and system based on air enthalpy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610977268.XA CN106594965B (en) | 2016-11-04 | 2016-11-04 | A kind of Fresh air handing control method and system based on air enthalpy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106594965A CN106594965A (en) | 2017-04-26 |
| CN106594965B true CN106594965B (en) | 2019-07-26 |
Family
ID=58590906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610977268.XA Active CN106594965B (en) | 2016-11-04 | 2016-11-04 | A kind of Fresh air handing control method and system based on air enthalpy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106594965B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461886A (en) * | 2017-07-28 | 2017-12-12 | 深圳达实智能股份有限公司 | A kind of appraisal procedure and device of hospital's PAU cold conveying efficiency |
| CN108151227B (en) * | 2017-12-25 | 2020-09-22 | 广东美的制冷设备有限公司 | Heat pump air conditioner tail end energy calculating method and air conditioner |
| CN109323409B (en) * | 2018-09-30 | 2021-06-18 | 广东美的制冷设备有限公司 | Air conditioner and control method and device thereof |
| CN110083133A (en) * | 2019-05-10 | 2019-08-02 | 北京恒世利德科技有限公司 | A kind of intelligent and safe laboratory control system |
| CN111023383A (en) * | 2019-12-18 | 2020-04-17 | 广西苏中达科智能工程有限公司 | Critical enthalpy difference compensation control method |
| CN114484725B (en) * | 2022-04-01 | 2022-07-15 | 湖南桅灯智能科技有限公司 | Air conditioner fresh air natural cooling dynamic control method and device |
| CN115218365B (en) * | 2022-07-12 | 2024-01-26 | 北京环都拓普空调有限公司 | Bypass adjusting method and corresponding fresh air fan |
| CN118031366B (en) * | 2024-03-01 | 2024-10-01 | 深圳市华瑞环境科技有限公司 | Air conditioner energy-saving refrigeration control method and system based on variable freezing water temperature model |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922781A (en) * | 2010-07-28 | 2010-12-22 | 重庆市同方科技发展有限公司 | Controlled environment temperature and humidity regulation based air conditioner energy saving control method and system |
| CN202853049U (en) * | 2012-10-24 | 2013-04-03 | 姚琛 | Air-conditioning system and enthalpy difference control system of tail end air-conditioner thereof |
| CN103486693A (en) * | 2013-09-25 | 2014-01-01 | 广州大学 | Energy-saving control method for central air-conditioning chilled water system |
| JP2014122740A (en) * | 2012-12-20 | 2014-07-03 | Shimizu Corp | Air conditioner and air conditioning system in operation room |
-
2016
- 2016-11-04 CN CN201610977268.XA patent/CN106594965B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922781A (en) * | 2010-07-28 | 2010-12-22 | 重庆市同方科技发展有限公司 | Controlled environment temperature and humidity regulation based air conditioner energy saving control method and system |
| CN202853049U (en) * | 2012-10-24 | 2013-04-03 | 姚琛 | Air-conditioning system and enthalpy difference control system of tail end air-conditioner thereof |
| JP2014122740A (en) * | 2012-12-20 | 2014-07-03 | Shimizu Corp | Air conditioner and air conditioning system in operation room |
| CN103486693A (en) * | 2013-09-25 | 2014-01-01 | 广州大学 | Energy-saving control method for central air-conditioning chilled water system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106594965A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106594965B (en) | A kind of Fresh air handing control method and system based on air enthalpy | |
| CN104359195B (en) | Based on the central air-conditioning freezing water controling method that dynamic response end total load changes | |
| CN107314498A (en) | The efficiency on-line monitoring method and device of a kind of central air conditioner system | |
| WO2015135339A1 (en) | Water tower applied to central air-conditioner for water source heat pump | |
| CN108844195B (en) | Temperature and humidity set value control device and control method | |
| CN103486691A (en) | Refrigerant flow control method and device for multi-connected air conditioning system | |
| CN103574858A (en) | Outdoor return air preprocessing method of central air-conditioning system | |
| CN204730410U (en) | A kind of full working scope adaptive controller of combined air conditioning box | |
| CN203785130U (en) | Circulating water wet film humidification system | |
| CN102778006A (en) | Method and device for acquiring pressure parameter of multi-connected air-conditioning system | |
| CN109059187A (en) | Capillary network radiation air-conditioner anti-condensation method, apparatus, system and control equipment | |
| CN105115113B (en) | A kind of central air conditioner room efficiency optimization system | |
| CN203454321U (en) | Energy-saving type anti-condensation air-conditioning system with adjustable air volume | |
| CN101922783A (en) | Enthalpy control-based method and system for controlling energy conservation of air conditioner | |
| CN108644955B (en) | Space humidity control method of floor cooling composite replacement ventilation system | |
| CN110081578B (en) | Intelligent control heat exchanger with bypass pipeline and control method | |
| CN113970177B (en) | Fresh air intake control method and device, refrigeration system and air conditioner | |
| CN206755342U (en) | A kind of intelligent fresh air apparatus and system | |
| CN206583042U (en) | Fresh air handling units applied to the air enthalpy of hospital freeze water controller | |
| CN205137786U (en) | Building power -operated control and subitem measurement system | |
| CN204693698U (en) | Highly effective energy-conserving multi-stage heat and wet treatment aircondition | |
| CN113465157A (en) | Multi-parameter dynamic fresh air control system and method | |
| CN204176810U (en) | A kind of operating room resh air requirement intelligent power saving regulator control system | |
| CN201697266U (en) | Constant-temperature and constant-humidity controller capable of automatically adjusting ratio of primary return air to secondary return air | |
| CN107646548A (en) | A kind of control system and its control method based on edible mushroom greenhouse-environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |