CN110411507B - Method and system for measuring and correcting optimal spraying efficiency of wet film humidification - Google Patents
Method and system for measuring and correcting optimal spraying efficiency of wet film humidification Download PDFInfo
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Abstract
The invention relates to a method and a system for measuring and correcting optimal spraying efficiency of wet film humidification, which are used for acquiring the wind speed v of outdoor air entering a wet film, the parameters of the outdoor air entering the wet film and the spraying water quantity Q, and calculating to obtain the optimal spraying efficiency ŋ0(ii) a Wherein the wet film parameter comprises the thickness d of the wet film; the parameters of the outdoor air inlet wet film comprise a dry bulb temperature Tg and relative humidity, and a wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity; according to formula ŋ0The best spray efficiency was calculated as (= (θ/v) × (Tg-Ts) × d ×.q. Compared with the prior art, the accurate optimal spraying efficiency ŋ can be obtained under the condition of comprehensively considering the wind speed v, the wet film thickness d and the correction coefficient theta0。
Description
Technical Field
The invention relates to the field of wet film humidification and cooling, in particular to a method and a system for measuring and correcting optimal spraying efficiency of wet film humidification.
Background
The increasingly strong energy conservation and emission reduction and green environmental protection requirements worldwide put forward higher requirements on the construction and operation of data centers with the largest energy consumption as the IT industry. The reduction of PUE values in data centers has become a primary appeal for owners and design builders.
For a traditional compressor refrigeration mode, the power consumption of the compressor is generally large, so that the energy consumption of the whole machine room air conditioner is very high, and the maintenance cost of the machine room is greatly increased. And the natural cold source is used for radiating heat for the machine room, so that the energy consumption of the machine room is reduced, and the whole PUE and CLF are lower.
Generally adopt evaporative cooling device (wet film humidification heat sink) through outdoor cold source (air) direct and water contact, utilize the heat of water absorption outdoor air, lead to the phase change of water, can better reduce the temperature of outdoor air, take away the heat of computer lab, do not have the influence to the environment moreover, water belongs to the environmental protection working medium, and the CLF of general computer lab can accomplish about 0.1.
Therefore, the efficient and energy-saving data center is a great inevitable trend for the development of the data center industry in the future, and it has become urgent to continuously and effectively reduce the operation cost of the data center. Therefore, the temperature of outdoor air is reduced more efficiently for direct evaporation cooling, and the heat of the machine room is taken away through a natural cold source, so that the whole energy consumption of the IT machine room system is very important.
The existing evaporative cooling device for reducing the indoor temperature of the machine room by adopting a natural cold source in the machine room generally adopts a humidifying film to spray and humidify and then exchange heat with outdoor air, so that the temperature of the outdoor air is reduced, and then the heat exchange with the indoor air of the machine room is carried out, so that cold quantity is provided for the indoor air of the machine room.
In the humidification cooling process, in order to improve wet film humidification cooling spray efficiency, need refer to best spray efficiency and compare, however, prior art best spray efficiency is otherwise obtained through the experiment, and the compliance is low, otherwise only obtains according to outdoor air temperature and spray volume measurement, and the best spray efficiency accuracy that obtains is low.
Disclosure of Invention
The invention provides a method and a system for measuring the optimal spraying efficiency of wet film humidification, which have the characteristic of obtaining more accurate optimal spraying efficiency.
The invention also provides a correction method for the optimal spraying efficiency of wet film humidification, and particularly has the characteristic of more accurately correcting the optimal spraying efficiency.
The invention also provides a wet film humidifying and cooling method and a device, which have the characteristics of reducing water consumption and improving wet film humidifying efficiency.
The invention also provides a computer storage medium having features facilitating implementation of any of the above methods.
A method for measuring the optimal spray efficiency of wet film includes collecting outdoor airCalculating the wind speed v of the humidity inlet film, the parameters of the outdoor air humidity inlet film and the spraying water quantity Q to obtain the optimal spraying efficiency ŋ0；
Wherein the wet film parameter comprises the thickness d of the wet film; the parameters of the outdoor air inlet wet film comprise a dry bulb temperature Tg and relative humidity, and a wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity; according to the formula
ŋ0=（θ/v） * (Tg-Ts) * d * Q
Calculating to obtain the optimal spraying efficiency;
theta is a correction coefficient of wet film humidification and cooling, and is obtained by looking up a table according to a corresponding relation between wind speed v and wet film thickness d, wherein the unit of the wind speed v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3In units of temperature,/s;
the method for obtaining the correction coefficient theta comprises the steps of changing the spraying water quantity Q according to the dry bulb temperature Tg and the wet bulb temperature Ts acquired in real time under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through multiple experiments, and then obtaining the optimal spraying efficiency according to a formula ŋ0And (d) = (theta/v) (Tg-Ts) × d × Q is reversely deduced to obtain a correction coefficient theta, finally obtaining a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range, and obtaining the correction coefficient theta according to the lookup table.
By adopting the technical scheme, the air speed parameter, the wet film parameter and the correction coefficient of outdoor air are introduced to obtain the optimal economic spraying efficiency, and the more accurate optimal spraying efficiency ŋ can be obtained under the condition of comprehensively considering the air speed v, the wet film thickness d and the correction coefficient theta0。
A correction method for the optimal spraying efficiency of wet film humidification comprises the steps of obtaining the optimal spraying efficiency in real time according to the measuring method and correcting.
A wet film humidification optimal spraying efficiency measuring system comprises,
the parameter acquisition module comprises a parameter acquisition module and a parameter acquisition module,
the outdoor air wind speed acquisition unit comprises an outdoor air wind speed acquisition unit and a wind speed control unit, wherein the outdoor air wind speed acquisition unit is used for acquiring the wind speed v of the outdoor air entering the wet film;
the wet film parameter acquisition unit comprises a wet film thickness acquisition unit and a wet film parameter acquisition unit, wherein the wet film thickness acquisition unit acquires the thickness d of a wet film;
the outdoor air inlet wet film parameter acquisition unit comprises a dry bulb temperature Tg and relative humidity acquisition unit, wherein the dry bulb temperature Tg and the relative humidity acquisition unit are used for acquiring the dry bulb temperature Tg and the relative humidity before the outdoor air enters the wet film;
the water spraying quantity acquisition unit comprises a water spraying quantity acquisition unit and a water spraying quantity acquisition unit, wherein the water spraying quantity acquisition unit is used for acquiring a water spraying quantity Q;
the correction coefficient acquisition unit is used for searching and obtaining a correction coefficient theta according to the acquired wind speed v and the acquired wet film thickness d and the correction coefficient lookup table;
a computing module comprising, in combination,
the wet bulb temperature calculation unit comprises a wet bulb temperature Ts obtained according to the dry bulb temperature Tg and the relative humidity;
optimum spray efficiency calculating unit according to formula ŋ0The optimal spray efficiency ŋ is calculated by = (theta/v) (Tg-Ts) × d × Q0；
And the correction coefficient lookup table calculation module is used for storing a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range.
Wherein the unit of the velocity v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3In units of temperature,/s; the method for obtaining the correction coefficient lookup table comprises the steps of changing the spraying water quantity Q according to the dry bulb temperature Tg and the wet bulb temperature Ts acquired in real time under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through multiple experiments, and then obtaining the optimal spraying efficiency according to a formula ŋ0And (d) = (theta/v) (Tg-Ts) × d × Q is reversely deduced to obtain a correction coefficient theta, and finally, a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range is obtained.
The wet film humidifying and cooling method provided by the invention comprises the steps of collecting the parameters of outdoor air entering the wet film and the temperature T of the outdoor air exiting the wet film; the parameters of the outdoor air humidity inlet film comprise dry bulb temperature Tg and relative humidity, wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity, and the wet bulb temperature Ts is obtained according to a formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ;
real-time judgment of the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; if the actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spraying amount to be increased; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount or stop spraying;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency is obtained by measurement and correction based on the optimal spraying efficiency measurement method.
The method also comprises the steps of spraying and humidifying the wet film in different areas, and calculating to obtain the actual spraying efficiency ŋ of each area of the wet filmi(ii) a ŋ real-time judging actual spraying efficiency of each subarea area of wet film1、ŋ2、……、ŋnAnd optimum spray efficiency ŋ0Relationship between the actual spray efficiency ŋiAt the optimum spray efficiency of ŋ0Within the error threshold range, maintaining the current spraying amount of the corresponding area; if a certain actual spray efficiency ŋiLess than optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spray amount of the corresponding area to be increased; if a certain actual spray efficiency ŋiGreater than optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount of the corresponding area or stop the spraying of the corresponding area; wherein i and n are both natural numbers,
n is 2 or more corresponding to the number of each divisional area of the wet film.
The method further comprises the steps of obtaining the optimal spraying efficiency corresponding to each subarea region by adopting the measuring method according to the thickness of each subarea region of the wet film, and comparing and judging according to the actual spraying efficiency of each subarea region and the corresponding optimal spraying efficiency when comparing and judging.
The error threshold range is greater than 0.95 ŋ0Less than 1.05 ŋ0。
The wet film humidifying and cooling device comprises a water tank, a water pump, a wet film and a spray header, wherein the wet film and the spray header are arranged in an evaporation chamber;
the system also comprises a flow control valve, an anemometer, a first temperature and humidity sensor and a second temperature and humidity sensor; the flow control valve is arranged on a pipeline communicated with the spray header and is used for controlling the water yield of the spray header; the anemoscope is arranged outside the evaporation chamber and is used for measuring the wind speed of outdoor air entering the wet film; the first temperature and humidity sensor is arranged outside the evaporation chamber and used for measuring the temperature and the relative humidity of outdoor air before the outdoor air enters the wet film; the second temperature and humidity sensor is arranged in the evaporation chamber, and is used for measuring the temperature and humidity of the outdoor air humidity outlet film at the outlet of the outdoor air humidity outlet chamber;
also comprises an actual spraying water amount control system, which comprises,
ŋ calculation module of spraying efficiency according to formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ; wherein T is the temperature of the outdoor air out of the wet film, Tg is the dry bulb temperature, and Ts is the wet bulb temperature;
a spray efficiency comparison and flow valve control module for judging the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; if the actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0Controlling the flow control valve to increase the spraying amount if the error threshold value is the lowest value; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0Controlling the flow control valve to reduce the spraying amount or stop spraying when the error threshold value is the highest value;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency is obtained by measurement and correction based on the optimal spraying efficiency measurement method.
The wet film partition is n partition areas, spray header groups are respectively and correspondingly arranged one by one, and the spray header groups are n in total, and each spray header group at least comprises one spray header; the second temperature and humidity sensor comprises n subarea areas which correspond to the wet film subareas one by one;
the water distributor is arranged on a water outlet pipeline of the water tank, n distribution pipelines are arranged at the water outlet end in a distribution manner, and the n distribution pipelines are in one-to-one correspondence with the n spray header groups; the flow control valves are arranged on the n shunt pipelines in a one-to-one correspondence manner; n is a natural number greater than or equal to 2;
and the spraying water quantity control system respectively calculates the actual spraying efficiency of each wet film subarea, compares each actual spraying efficiency with the optimal spraying efficiency, and then respectively controls the flow control valve corresponding to each wet film subarea according to the comparison control method of the control module.
According to the thickness of each subarea region of the wet film, the optimal spraying efficiency corresponding to each subarea region is obtained by adopting the measuring method, and when the comparison and judgment are carried out, the comparison and judgment are carried out according to the actual spraying efficiency of each subarea region and the corresponding optimal spraying efficiency.
Said n is equal to 3.
According to the present invention there is provided a computer storage medium storing a computer program capable of being loaded by a processor and performing any of the methods described above.
In summary, compared with the prior art, the invention can obtain more accurate and optimal spraying efficiency ŋ under the condition of comprehensively considering the wind speed v, the wet film thickness d and the correction coefficient theta0。
Drawings
FIG. 1 is a graph showing the development curve of spraying efficiency with spraying amount;
FIG. 2 is a schematic structural diagram of a wet film humidifying and cooling device according to one embodiment of the present invention;
reference numerals: 1-water tank, 2-water pump, 3-preceding water pump ball valve, 4-back water pump ball valve, 5-check valve, 6-water shunt, 7-1 branch flow pipe way, 8-2 branch flow pipe way, 9-3 branch flow pipe way, 10-1 district flow control valve, 11-2 district flow control valve, 12-3 district flow control valve, 13-anemoscope, 14-first temperature and humidity sensor, 15-first shower head, 16-second shower head, 17-third shower head, 18-1 district wet film, 19-1 district second temperature and humidity sensor, 20-2 district wet film, 21-2 district second temperature and humidity sensor, 22-3 district wet film, 23-3 district second temperature and humidity sensor.
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. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Any feature disclosed in this specification (including any accompanying drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
As an implementation mode of the invention, the method for measuring the optimal spraying efficiency of the wet film humidification comprises the steps of collecting the wind speed v of outdoor air entering the wet film, the parameters of the outdoor air entering the wet film and the spraying water quantity Q, and calculating to obtain the optimal spraying efficiency ŋ0；
Wherein the wet film parameter comprises the thickness d of the wet film; the parameters of the outdoor air inlet wet film comprise a dry bulb temperature Tg and relative humidity, and a wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity; according to the formula
ŋ0=（θ/v） * (Tg-Ts) * d * Q
Calculating to obtain the optimal spraying efficiency;
theta is a correction coefficient of wet film humidification and cooling, and is obtained by looking up a table according to a corresponding relation between wind speed v and wet film thickness d, wherein the unit of the wind speed v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3The unit of temperature is DEG C, and only a numerical value is taken for calculation in the calculation process;
the method for obtaining the correction coefficient theta comprises the steps of changing the spraying water quantity Q according to the real-time collected dry-bulb temperature Tg and wet-bulb temperature Ts under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through a plurality of experiments and then obtaining the optimal spraying efficiency according to a formula ŋ as shown in figure 10=（θ/v) (Tg-Ts) (d) Q is reversely deduced to obtain a correction coefficient theta, finally, a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range is obtained, and the correction coefficient theta is obtained according to the lookup table.
As shown in fig. 1, in the OB stage, it is explained that the efficiency does not change much after the spraying amount is increased. Point a is the best economic efficiency correspondence point. The common experimental environment can select 25 ℃ of outdoor air and 50% of humidity; or 38 ℃ and 25% of humidity, or 15 ℃ and 80% of humidity.
When the temperature difference between the dry bulb and the wet bulb is 15 ℃, the wet film is made of paper, the thickness of the material is 100mm =0.1m, the wind speed is 2.5m/s, and the water amount is 1.5m3In this case, the value of theta is about 0.25; the best economic spraying efficiency is generally about 0.65.
When the temperature difference between the dry bulb and the wet bulb is 12 ℃, the wet film is a stainless steel wet film, the material thickness is 300mm =0.3m, the wind speed is 2.5m/s, and the water amount is 1.5m3Theta is about 0.44 at the moment; the optimal economic spraying efficiency is generally about 0.95.
By adopting the technical scheme, the air speed parameter, the wet film parameter and the correction coefficient of outdoor air are introduced to obtain the optimal economic spraying efficiency, and the more accurate optimal spraying efficiency ŋ can be obtained under the condition of comprehensively considering the air speed v, the wet film thickness d and the correction coefficient theta0。
Example 2
As an embodiment of the present invention, a method for correcting an optimal spraying efficiency in wet film humidification includes acquiring an optimal spraying efficiency in real time and correcting the optimal spraying efficiency according to the measurement method of example 1.
Example 3
As an embodiment of the invention, the optimal spraying efficiency measuring system for wet film humidification comprises,
the parameter acquisition module comprises a parameter acquisition module and a parameter acquisition module,
the outdoor air wind speed acquisition unit comprises an outdoor air wind speed acquisition unit and a wind speed control unit, wherein the outdoor air wind speed acquisition unit is used for acquiring the wind speed v of the outdoor air entering the wet film;
the wet film parameter acquisition unit acquires the thickness d of the wet film (the thickness of the wet film does not change much in a short time and can be a stored fixed value and can be directly acquired, and if the thickness of the wet film needs to be corrected, the fixed value is corrected manually in real time);
the outdoor air inlet wet film parameter acquisition unit comprises a dry bulb temperature Tg and relative humidity acquisition unit, wherein the dry bulb temperature Tg and the relative humidity acquisition unit are used for acquiring the dry bulb temperature Tg and the relative humidity before the outdoor air enters the wet film;
the water spraying quantity acquisition unit comprises a water spraying quantity acquisition unit and a water spraying quantity acquisition unit, wherein the water spraying quantity acquisition unit is used for acquiring a water spraying quantity Q;
the correction coefficient acquisition unit is used for searching and obtaining a correction coefficient theta according to the acquired wind speed v and the acquired wet film thickness d and the correction coefficient lookup table;
a computing module comprising, in combination,
the wet bulb temperature calculation unit comprises a wet bulb temperature Ts obtained according to the dry bulb temperature Tg and the relative humidity;
optimum spray efficiency calculating unit according to formula ŋ0The optimal spray efficiency ŋ is calculated by = (theta/v) (Tg-Ts) × d × Q0；
The correction coefficient lookup table calculation module is used for storing a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range;
wherein the unit of the velocity v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3In units of temperature,/s; the method for obtaining the correction coefficient lookup table comprises the steps of changing the spraying water quantity Q according to the dry bulb temperature Tg and the wet bulb temperature Ts acquired in real time under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through multiple experiments, and then obtaining the optimal spraying efficiency according to a formula ŋ0And (d) = (theta/v) (Tg-Ts) × d × Q is reversely deduced to obtain a correction coefficient theta, and finally, a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range is obtained.
Example 4
As an embodiment of the invention, the wet film humidifying and cooling method comprises the steps of collecting parameters of outdoor air entering a wet film and the temperature T of the outdoor air exiting the wet film; the parameters of the outdoor air humidity inlet film comprise dry bulb temperature Tg and relative humidity, wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity, and the wet bulb temperature Ts is obtained according to a formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ;
real-time judgment of the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; if the actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spraying amount to be increased; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount or stop spraying;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency is obtained by measurement and correction based on the optimal spraying efficiency measurement method in the embodiment 1.
In the embodiment, the real-time actual spraying efficiency ŋ is obtained by real-time calculation according to the calculation parameters collected in real time. The calculation parameters comprise parameters before outdoor air enters the wet film, including dry bulb temperature Tg and wet bulb temperature Ts, and the wet bulb temperature Ts can not be directly acquired and needs to be obtained according to the dry bulb temperature Tg and relative humidity, so that the wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and relative humidity, wherein the wet bulb temperature Ts obtained according to the dry bulb temperature Tg and relative humidity is used as a calculation method in the prior art and is not elaborated herein. The calculated parameters also included the temperature T of the outdoor air out of the wet film, and then the actual spray efficiency ŋ was calculated according to the formula T = Tg- ŋ (Tg-Ts).
For the determination process, in the present embodiment, the determination process is not limited, and it may be determined whether the actual spraying efficiency ŋ is the optimal spraying efficiency ŋ or not0If not, judging other conditions; or whether the actual spraying efficiency ŋ is less than the optimal spraying efficiency ŋ can be judged firstly0If not, judging other conditions; or whether the actual spraying efficiency ŋ is greater than the optimal spraying efficiency ŋ can be judged firstly0If not, judging other conditions; the subsequent judgment process is the same.
In the embodiment, the same spraying amount is not adopted for the parameters of the different outdoor air humidity inlet membranes to humidify the humidity membranes, but the spraying amount is adjusted in real time according to the change of the actual spraying efficiency ŋ caused by the dry bulb temperature Tg and the wet bulb temperature Ts of the different outdoor air humidity inlet membranes, so that the power consumption and the water consumption of the water pump are reduced under the condition of the optimal spraying efficiency.
Through this concrete embodiment, gather the parameter that outdoor air got into wet membrane, adopt the different volume of spraying to wet membrane humidification to the parameter that different outdoor air got into wet membrane, can carry out the maximum cooling to outdoor air, when providing sufficient cold volume for computer lab indoor air, reduce water pump consumption and water consumption to improve wet membrane humidification efficiency, reach the purpose of water conservation and economize on electricity.
Example 5
As a specific implementation manner of the present invention, on the basis of embodiment 4, the method further includes, humidifying the wet film by spraying in the sub-regions, and calculating to obtain the actual spraying efficiency ŋ of each sub-region of the wet filmi(ii) a ŋ real-time judging actual spraying efficiency of each subarea area of wet film1、ŋ2、……、ŋnAnd optimum spray efficiency ŋ0Relationship between the actual spray efficiency ŋiAt the optimum spray efficiency of ŋ0Within the error threshold range, maintaining the current spraying amount of the corresponding area; if a certain actual spray efficiency ŋiLess than optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spray amount of the corresponding area to be increased; if a certain actual spray efficiency ŋiGreater than optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount of the corresponding area or stop the spraying of the corresponding area; wherein i and n are both natural numbers,
n is 2 or more corresponding to the number of each divisional area of the wet film.
The problems of uneven material and the like caused by long-term use of the wet film result in different water storage capacities of the wet film after humidification at different positions, thereby resulting in humidification effectThe rate is low. In this embodiment, the wet film is humidified by spraying in different regions, and the actual spraying efficiency ŋ of each region is calculated and judgediAnd optimum spray efficiency ŋ0The relation between, and then the convenient volume that sprays to further the different positions of wet film is controlled to can control different volumes that spray to the different positions humidification back retaining capacity of wet film, improve humidification efficiency, make full use of nature cold source reduces the PUE and the WUE of computer lab.
Example 6
As a specific implementation manner of the present invention, on the basis of the embodiment 4 or 5, the method further includes obtaining the optimal spraying efficiency corresponding to each partition area by using the measuring method of the embodiment 1 according to the thickness of each partition area of the wet film, and comparing and judging according to the actual spraying efficiency of each partition area and the corresponding optimal spraying efficiency when comparing and judging.
Example 7
As a mode of embodiment of the present invention, on the basis of one of embodiments 4 to 6, the error threshold range is greater than 0.95 ŋ0Less than 1.05 ŋ0. The error range may be set to be greater than 0.95 ŋ0Less than 1.05 ŋ0Or other ranges, may be set according to actual needs.
Example 8
A wet film humidifying and cooling device comprises a water tank 1, a water pump 2, a wet film and a spray header, wherein the wet film and the spray header are arranged in an evaporation chamber;
the system also comprises a flow control valve, an anemometer 13, a first temperature and humidity sensor 14 and a second temperature and humidity sensor; the flow control valve is arranged on a pipeline communicated with the spray header and is used for controlling the water yield of the spray header; the anemoscope 13 is arranged outside the evaporation chamber and is used for measuring the wind speed of outdoor air entering the wet film; the first temperature and humidity sensor 14 is arranged outside the evaporation chamber and is used for measuring the temperature and the relative humidity of outdoor air before the outdoor air enters the wet film; the second temperature and humidity sensor is arranged in the evaporation chamber, and is used for measuring the temperature and humidity of the outdoor air humidity outlet film at the outlet of the outdoor air humidity outlet chamber;
also comprises an actual spraying water amount control system, which comprises,
ŋ calculation module of spraying efficiency according to formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ; wherein T is the temperature of the outdoor air out of the wet film, Tg is the dry bulb temperature, and Ts is the wet bulb temperature;
a spray efficiency comparison and flow valve control module for judging the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; if the actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0Controlling the flow control valve to increase the spraying amount if the error threshold value is the lowest value; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0Controlling the flow control valve to reduce the spraying amount or stop spraying when the error threshold value is the highest value;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency is obtained by measurement and correction based on the optimal spraying efficiency measurement method in the embodiment 1.
In the embodiment shown in fig. 2, the water pump further comprises a front water pump ball valve 3 in front of the water outlet direction of the water pump 2, a rear water pump ball valve 4 in the rear of the water outlet direction, and a check valve 5 arranged on the main water outlet pipeline and behind the rear water pump ball valve 4.
In the wet film humidifying and cooling device of the embodiment, the wet film is humidified by not adopting the same spraying amount for different parameters of the outdoor air inlet wet film, but the spraying amount is adjusted in real time according to the change of the actual spraying efficiency ŋ caused by the dry bulb temperature Tg and the wet bulb temperature Ts of different outdoor air inlet wet films, so that the power consumption and the water consumption of the water pump are reduced under the condition of the optimal spraying efficiency, and the purposes of saving water and electricity are achieved.
Example 9
As a specific implementation manner of the present invention, on the basis of example 8, the wet film is divided into n divisional areas, each of which has n shower head groups corresponding to each other, and each shower head group includes at least one shower head; the second temperature and humidity sensor comprises n subarea areas which correspond to the wet film subareas one by one;
the water distributor is characterized by further comprising a water distributor 6 arranged on a water outlet pipeline of the water tank 1, wherein n distribution pipelines are arranged at the water outlet end in a distribution mode and correspond to the n spray header groups one by one; the flow control valves are arranged on the n shunt pipelines in a one-to-one correspondence manner; n is a natural number greater than or equal to 2;
and the spraying water quantity control system respectively calculates the actual spraying efficiency of each wet film subarea, compares each actual spraying efficiency with the optimal spraying efficiency, and then respectively controls the flow control valve corresponding to each wet film subarea according to the comparison control method of the control module.
In the embodiment shown in fig. 2, n =3, the wet film partitions are the 1-region wet film 18, the 2-region wet film 20, and the 3-region wet film 22, each partition corresponds to one shower head group, each shower head group includes at least one shower head, in the embodiment shown in fig. 1, each shower head group includes two shower heads, and in specific implementation, the number of the shower heads included in each shower head group may be set according to the uniformity of the shower. As shown in fig. 1, the wet film 18 in the 1-zone corresponds to two first spray headers 15, the wet film 20 in the 2-zone corresponds to two second spray headers 16, and the wet film 22 in the 3-zone corresponds to a third spray header 17; the 1-region wet film 18 corresponds to a 1-region second temperature and humidity sensor 19, the 2-region wet film 20 corresponds to a 2-region second temperature and humidity sensor 21, and the 3-region wet film 22 corresponds to a 3-region second temperature and humidity sensor 23.
In the embodiment shown in fig. 2, the water diverter 6 is disposed behind the one-way valve in the water outlet direction, and the water outlet end is provided with 3 diversion pipes, namely, a 1-division diversion pipe 7 corresponding to the 1-division jet head set, a 2-division diversion pipe 8 corresponding to the 2-division jet head set, and a 3-division diversion pipe 9 corresponding to the 3-division jet head set. Wherein, the 1-zone flow control valve 10 is arranged on the 1-zone flow dividing pipeline 7, the 2-zone flow control valve 11 is arranged on the 2-zone flow dividing pipeline 8, and the 3-zone flow control valve 12 is arranged on the 3-zone flow dividing pipeline.
As shown in figure 2, the whole figure has 1 set of water system, spray water is humidified by a wet film and then returns to a water tank after exchanging heat with outdoor air, and the spray water is recycled. After the partition, the spraying system of the device has 7 operation modes: namely, the 1 region, the 2 region and the 3 region can be independently operated; the area 1, the area 2 and the area 3 can be combined and operated simultaneously; zone 1, zone 2 and zone 3 may also be operated in combination. In fig. 2, the water flow divider 6 may be divided into a 1-division flow pipeline, a 2-division flow pipeline, and a 3-division flow pipeline at the same time, or may be divided into a 1-division flow pipeline, a 2-division flow pipeline, and a 3-division flow pipeline separately, or may be divided into a 1-division flow pipeline, a 2-division flow pipeline, and a 3-division flow pipeline arbitrarily; the flow control valves 10 in the area 1, the flow control valves 11 in the area 2 and the flow control valves in the area 3 can control different opening degrees to supply water for the flow dividing pipelines in the area 1, the flow dividing pipelines in the area 2 and the flow dividing pipelines in the area 3.
In this embodiment, carry out subregion and spray the humidification to the wet film, can control different volume that sprays to the retaining capacity difference after the different positions humidification of wet film, improve humidification efficiency, make full use of nature cold source reduces the PUE and the WUE of computer lab.
Example 10
As a specific embodiment of the present invention, based on example 7 or 8, the best spraying efficiency corresponding to each partition region is obtained by the measuring method of example 1 according to the thickness of each partition region of the wet film, and when comparing and judging, the actual spraying efficiency of each partition region is compared and judged with the corresponding best spraying efficiency.
Example 11
As an embodiment of the present invention, there is provided a computer storage medium storing a computer program capable of being loaded by a processor and executing the method according to any one of embodiments 1 to 2 and 4 to 7, so as to implement the method.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The method for measuring the optimal spraying efficiency of wet film humidification comprises the step of collecting outdoorCalculating the wind speed v of the air inlet wet film, the wet film parameter, the outdoor air inlet wet film parameter and the spraying water quantity Q to obtain the optimal spraying efficiency ŋ0；
Wherein the wet film parameter comprises the thickness d of the wet film; the parameters of the outdoor air inlet wet film comprise a dry bulb temperature Tg and relative humidity, and a wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity; according to the formula
ŋ0=（θ/v） * (Tg-Ts) * d * Q
Calculating to obtain the optimal spraying efficiency;
theta is a correction coefficient of wet film humidification and cooling, and is obtained by looking up a table according to a corresponding relation between wind speed v and wet film thickness d, wherein the unit of the wind speed v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3In units of temperature,/s;
the method for obtaining the correction coefficient theta comprises the steps of changing the spraying water quantity Q according to the dry bulb temperature Tg and the wet bulb temperature Ts acquired in real time under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through multiple experiments, and then obtaining the optimal spraying efficiency according to a formula ŋ0And (d) = (theta/v) (Tg-Ts) × d × Q is reversely deduced to obtain a correction coefficient theta, finally obtaining a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range, and obtaining the correction coefficient theta according to the lookup table.
2. The method for correcting the optimal spraying efficiency of wet film humidification comprises the step of obtaining the optimal spraying efficiency in real time and correcting according to the method for measuring the optimal spraying efficiency as claimed in claim 1.
3. The optimal spraying efficiency measuring system for wet film humidification is characterized by comprising,
the parameter acquisition module comprises a parameter acquisition module and a parameter acquisition module,
the outdoor air wind speed acquisition unit comprises an outdoor air wind speed acquisition unit and a wind speed control unit, wherein the outdoor air wind speed acquisition unit is used for acquiring the wind speed v of the outdoor air entering the wet film;
the wet film parameter acquisition unit comprises a wet film thickness acquisition unit and a wet film parameter acquisition unit, wherein the wet film thickness acquisition unit acquires the thickness d of a wet film;
the outdoor air inlet wet film parameter acquisition unit comprises a dry bulb temperature Tg and relative humidity acquisition unit, wherein the dry bulb temperature Tg and the relative humidity acquisition unit are used for acquiring the dry bulb temperature Tg and the relative humidity before the outdoor air enters the wet film;
the water spraying quantity acquisition unit comprises a water spraying quantity acquisition unit and a water spraying quantity acquisition unit, wherein the water spraying quantity acquisition unit is used for acquiring a water spraying quantity Q;
the correction coefficient acquisition unit is used for searching and obtaining a correction coefficient theta according to the acquired wind speed v and the acquired wet film thickness d and the correction coefficient lookup table;
a computing module comprising, in combination,
the wet bulb temperature calculation unit comprises a wet bulb temperature Ts obtained according to the dry bulb temperature Tg and the relative humidity;
optimum spray efficiency calculating unit according to formula ŋ0The optimal spray efficiency ŋ is calculated by = (theta/v) (Tg-Ts) × d × Q0；
The correction coefficient lookup table calculation module is used for storing a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range;
wherein the unit of the velocity v is m/s, the unit of the thickness d is m, and the unit of the spraying water quantity Q is m3In units of temperature,/s; the method for obtaining the correction coefficient lookup table comprises the steps of changing the spraying water quantity Q according to the dry bulb temperature Tg and the wet bulb temperature Ts acquired in real time under the condition of a certain wet film thickness d and wind speed v, obtaining the optimal spraying efficiency through multiple experiments, and then obtaining the optimal spraying efficiency according to a formula ŋ0And (d) = (theta/v) (Tg-Ts) × d × Q is reversely deduced to obtain a correction coefficient theta, and finally, a corresponding correction coefficient theta lookup table in a certain wet film thickness range and a certain wind speed range is obtained.
4. The wet film humidifying and cooling method comprises the steps of collecting parameters of outdoor air entering a wet film and the temperature T of the outdoor air exiting the wet film; the parameters of the outdoor air humidity inlet film comprise dry bulb temperature Tg and relative humidity, wet bulb temperature Ts is obtained according to the dry bulb temperature Tg and the relative humidity, and the wet bulb temperature Ts is obtained according to a formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ;
real-time judgment of the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; such as fruitThe actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spraying amount to be increased; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount or stop spraying;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency measurement method according to claim 1 is obtained by measurement and correction.
5. The wet film humidifying and cooling method as claimed in claim 4, further comprising spraying and humidifying the wet film in different regions, and calculating ŋ actual spraying efficiency of each region of the wet filmi(ii) a ŋ real-time judging actual spraying efficiency of each subarea area of wet film1、ŋ2、……、ŋnAnd optimum spray efficiency ŋ0Relationship between the actual spray efficiency ŋiAt the optimum spray efficiency of ŋ0Within the error threshold range, maintaining the current spraying amount of the corresponding area; if a certain actual spray efficiency ŋiLess than optimum spray efficiency ŋ0The lowest value of the error threshold value is used for controlling the spray amount of the corresponding area to be increased; if a certain actual spray efficiency ŋiGreater than optimum spray efficiency ŋ0The maximum value of the error threshold value is controlled to reduce the spraying amount of the corresponding area or stop the spraying of the corresponding area; wherein i and n are both natural numbers,
n is 2 or more corresponding to the number of each divisional area of the wet film.
6. The wet film humidifying and cooling method according to claim 5, further comprising obtaining the optimal spraying efficiency corresponding to each partition area by the optimal spraying efficiency measuring method according to claim 1 according to the thickness of each partition area of the wet film, and comparing and judging according to the actual spraying efficiency of each partition area and the corresponding optimal spraying efficiency when comparing and judging.
7. The wet film humidifying and cooling device comprises a water tank (1), a water pump (2), a wet film and a spray header, wherein the wet film and the spray header are arranged in an evaporation chamber; it is characterized in that the preparation method is characterized in that,
the system also comprises a flow control valve, an anemometer (13), a first temperature and humidity sensor (14) and a second temperature and humidity sensor; the flow control valve is arranged on a pipeline communicated with the spray header and is used for controlling the water yield of the spray header; the anemoscope (13) is arranged outside the evaporation chamber and is used for measuring the wind speed of outdoor air entering the wet film; the first temperature and humidity sensor (14) is arranged outside the evaporation chamber and used for measuring the temperature and the relative humidity of outdoor air before entering the wet film; the second temperature and humidity sensor is arranged in the evaporation chamber, and is used for measuring the temperature and humidity of the outdoor air humidity outlet film at the outlet of the outdoor air humidity outlet chamber;
also comprises an actual spraying water amount control system, which comprises,
ŋ calculation module of spraying efficiency according to formula
T=Tg- ŋ（Tg-Ts）
Calculating to obtain the actual spraying efficiency ŋ; wherein T is the temperature of the outdoor air out of the wet film, Tg is the dry bulb temperature, and Ts is the wet bulb temperature;
a spray efficiency comparison and flow valve control module for judging the actual spray efficiency ŋ and the optimal spray efficiency ŋ0If the actual spray efficiency ŋ is at the optimum spray efficiency ŋ0Within the error threshold range, maintaining the current spraying amount; if the actual spray efficiency ŋ is less than the optimum spray efficiency ŋ0Controlling the flow control valve to increase the spraying amount if the error threshold value is the lowest value; if the actual spray efficiency ŋ is greater than the optimum spray efficiency ŋ0Controlling the flow control valve to reduce the spraying amount or stop spraying when the error threshold value is the highest value;
wherein the optimal spray efficiency ŋ0The optimal spraying efficiency measurement method according to claim 1 is obtained by measurement and correction.
8. The wet film humidifying and cooling device as claimed in claim 7, wherein the wet film is divided into n divisional areas, each of which is provided with a group of showerheads in one-to-one correspondence, wherein each group of showerheads comprises at least one showerhead; the second temperature and humidity sensor comprises n subarea areas which correspond to the wet film subareas one by one;
the water distributor is arranged on a water outlet pipeline of the water tank, n distribution pipelines are arranged at the water outlet end in a distribution manner, and the n distribution pipelines are in one-to-one correspondence with the n spray header groups; the flow control valves are arranged on the n shunt pipelines in a one-to-one correspondence manner; n is a natural number greater than or equal to 2;
and the spraying water quantity control system respectively calculates the actual spraying efficiency of each wet film subarea, compares each actual spraying efficiency with the optimal spraying efficiency, and then respectively controls the flow control valve corresponding to each wet film subarea according to the comparison control method of the control module.
9. The wet film humidifying and cooling device according to claim 8, wherein the optimal spraying efficiency corresponding to each partition region is obtained by the optimal spraying efficiency measuring method according to claim 1 according to the thickness of each partition region of the wet film, and when the comparison is judged, the comparison is carried out according to the actual spraying efficiency of each partition region and the corresponding optimal spraying efficiency.
10. Computer storage medium, characterized in that a computer program is stored which can be loaded by a processor and which executes the method of any of claims 1 to 2 and 4 to 6.
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