CN115235286A - Heat exchange frequency adjusting method and system - Google Patents
Heat exchange frequency adjusting method and system Download PDFInfo
- Publication number
- CN115235286A CN115235286A CN202210874799.1A CN202210874799A CN115235286A CN 115235286 A CN115235286 A CN 115235286A CN 202210874799 A CN202210874799 A CN 202210874799A CN 115235286 A CN115235286 A CN 115235286A
- Authority
- CN
- China
- Prior art keywords
- temperature
- outlet
- energy consumption
- inlet
- difference value
- 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.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a heat exchange frequency adjusting method and system, and relates to the technical field of heat exchange. The adjusting method is used for adjusting the heat exchange system; the adjusting heat exchange system comprises a cooling water pump, a cooling tower and a heat exchanger; a first outlet of the heat exchanger is connected with a cooling water pump; the inlet of the heat exchanger is connected with a cooling tower; communicating with air at a second outlet of the heat exchanger; the adjusting method comprises the steps of acquiring sampling data; calculating to obtain a first temperature difference value, a second temperature difference value and a third temperature difference value; when the third temperature difference value is in a set range, calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower; then determining a target temperature of the first outlet and a target temperature of the inlet; respectively controlling a cooling water pump and a cooling tower to carry out frequency regulation according to the target temperatures of the first outlet and the first inlet by adopting a PID algorithm; the invention can automatically adjust the frequency, realize the timely adjustment of the frequency and simultaneously reduce the energy consumption.
Description
Technical Field
The invention relates to the technical field of heat exchange, in particular to a heat exchange frequency adjusting method and system.
Background
The plate heat exchanger is a high-efficiency heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes. Thin rectangular channels are formed between the various plates through which heat is exchanged. In a central air conditioning system of an electronic factory, a plate type heat exchanger is often designed and installed. In winter, because the external environment temperature is lower, the cooling water is often used as a cold source, and the plate heat exchanger is used for heat exchange, so that the cooling of a demand area is realized. In general, a "cold side" device has a cooling water pump and a cooling tower. The cooling circulating water in the pipeline is conveyed into the heat exchanger by the cooling water pump, and after heat exchange, the circulating water is conveyed to the cooling tower for heat dissipation and then flows back to the pipeline, so that one cooling circulation is completed. The flow rate and the temperature of the cooling circulating water can generate corresponding influence on the heat exchange effect of the heat exchanger, so that the cooling circulating water needs to be properly adjusted according to the cold quantity requirement of the use side.
The frequency adjusting method of the cooling water pump and the cooling tower corresponding to the prior art comprises the following steps:
1. and (3) fixed frequency adjustment: the operator sets the running frequency of the cooling water pump and the cooling tower manually according to the demand condition and by combining personal experience.
2. Target temperature regulation: the frequency of the cooling water pump is automatically adjusted (a frequency increment value is calculated by adopting an increment type PID algorithm, and then a frequency set value is calculated by combining the current operating frequency) according to the outlet temperature of the cooling water (the temperature of the cooling circulating water flowing out of the heat exchanger) and a corresponding target value (the target value is manually set); the cooling tower frequency is automatically adjusted (frequency increment value is calculated by incremental PID algorithm and then frequency set value is calculated in conjunction with current operating frequency) based on the cooling water inlet temperature (the temperature at which the cooling circulating water flows into the heat exchanger, which can be considered equal to the temperature at which the circulating water flows out of the cooling tower) and its corresponding target value (which is set manually). PID means that regulation control is performed.
However, the method has the following problems in the practical application process:
1. and (3) fixed frequency adjustment: since the frequency setting depends on the personal experience of the operator, this method is not suitable for most application environments; when the cold quantity demand of the use side is changed, the frequency adjustment cannot be carried out in time (when the cold quantity demand of the use side is reduced, a cooling water pump and a cooling tower consume more electric energy, and when the cold quantity demand of the use side is increased, the cold supply of the use side cannot reach the standard possibly).
2. Target temperature regulation: because the method focuses on the outlet temperature and the inlet temperature of the cooling circulating water and corresponding target values thereof, the method cannot accurately carry out corresponding change adjustment according to the cold quantity requirement of a use side; when the cold demand of the 'use side' is changed, the corresponding target values of the outlet temperature and the inlet temperature of the cooling water need to be adjusted manually (and the setting of the target values also depends on personal experience); because the cooling water pump and the cooling tower adopt respective independent temperature target values for adjustment, the coordinated control of the cooling water pump and the cooling tower cannot be realized, and the energy consumption of corresponding equipment may be increased.
Disclosure of Invention
The invention aims to provide a heat exchange frequency adjusting method and a heat exchange frequency adjusting system, which are used for automatically adjusting the frequency, realizing the timely adjustment of the frequency and reducing the energy consumption.
In order to achieve the purpose, the invention provides the following scheme:
a heat exchange frequency adjustment method for adjusting a heat exchange system; the adjusting heat exchange system comprises a cooling water pump, a cooling tower and a heat exchanger; the outlet of the cooling tower is connected with the inlet of the heat exchanger; the first outlet of the heat exchanger is connected with the inlet of the cooling tower through the cooling water pump; a second outlet of the heat exchanger is communicated with the outside;
the adjusting method comprises the following steps:
acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data comprises a temperature of an inlet of the heat exchanger, a temperature of a first outlet, and a temperature of a second outlet;
calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet;
when the third temperature difference value is in a set range, calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower;
determining a target temperature of the first outlet and a target temperature of the inlet according to the energy consumption increment of the cooling water pump, the energy consumption increment of the cooling tower, the temperature of the first outlet, the temperature of the inlet and the third temperature difference value;
controlling the cooling water pump to adjust the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
Optionally, the adjusting method further comprises: prior to the acquiring the sample data, further comprising:
judging whether the operation time length of the heat exchange adjusting system is greater than a set steady state period or not;
if the operation duration of the heat exchange system is longer than the set steady state period, acquiring the temperature of an inlet of the heat exchanger at the current moment and the temperature of a first outlet of the heat exchanger at the current moment, and executing a primary adjusting process;
when the adjusting time length of the preliminary adjusting process is longer than the set adjusting period, executing the step of acquiring sampling data;
the preliminary adjustment process is as follows:
and controlling the cooling water pump to adjust the frequency of the cooling water pump according to the temperature of the first outlet at the current moment and controlling the cooling tower to adjust the frequency of the cooling tower according to the temperature of the inlet at the current moment by adopting a PID algorithm.
Optionally, when the third temperature difference value is within a set range, correspondingly calculating an energy consumption increment according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump, and the energy consumption of the cooling tower, specifically:
ΔT 1 ＝T 2 -T 3
ΔT 3 ＝T 3 -T 4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 Is the set temperature of the second outlet, T 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
Optionally, the determining the target temperature of the first outlet and the target temperature of the inlet according to the energy consumption increment of the cooling water pump, the energy consumption increment of the cooling tower, the temperature of the first outlet, the temperature of the inlet, and the third temperature difference value specifically includes:
if the energy consumption increment of the cooling water pump is smaller than or equal to that of the cooling tower, adding the temperature of the first outlet and the third temperature difference value to obtain a target temperature of the first outlet, and taking the temperature of the inlet as the target temperature of the inlet;
and if the energy consumption increment of the cooling water pump is larger than that of the cooling tower, taking the temperature of the first outlet as the target temperature of the first outlet, and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet.
A heat exchange frequency adjustment system for implementing the heat exchange frequency adjustment method of any one of the above;
the conditioning system comprises:
the sampling data acquisition module is used for acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data comprises a temperature of an inlet of the heat exchanger, a temperature of a first outlet, and a temperature of a second outlet;
the temperature difference value calculating module is used for calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet;
the energy consumption increment calculating module is used for calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower when the third temperature difference value is in a set range;
a target temperature determination module, configured to determine a target temperature of the first outlet and a target temperature of the inlet according to an energy consumption increment of the cooling water pump, an energy consumption increment of the cooling tower, a temperature of the first outlet, a temperature of the inlet, and the third temperature difference value;
the frequency regulation control module is used for controlling the cooling water pump to regulate the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
Optionally, the adjustment system further comprises:
the first judgment module is used for judging whether the operation time length of the heat exchange regulation system is longer than a set steady-state period;
a preliminary adjusting module, configured to, if the operation duration of the heat exchange system is longer than a set steady-state period, obtain a temperature of an inlet of the heat exchanger at the current time and a temperature of a first outlet of the heat exchanger at the current time, and execute a "frequency adjustment preliminary control module";
the second judgment module is used for executing the sampling data acquisition module when the adjusting time length of the frequency adjusting preliminary control module is greater than a set adjusting period;
and the frequency regulation primary control module is used for controlling the cooling water pump to regulate the frequency of the cooling water pump according to the temperature of the first outlet at the current moment by adopting a PID algorithm and controlling the cooling tower to regulate the frequency of the cooling tower according to the temperature of the inlet at the current moment.
Optionally, the energy consumption increment calculation module specifically includes:
ΔT 1 ＝T 2 -T 3
ΔT 2 ＝T 3 -T 4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 For a set temperature of the second outlet, T 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
Optionally, the target temperature determining module specifically includes:
a first target value determining submodule, configured to add the temperature of the first outlet to the third temperature difference value to obtain a target temperature of the first outlet if the energy consumption increment of the cooling water pump is smaller than or equal to the energy consumption increment of the cooling tower; taking the temperature of the inlet as a target temperature of the inlet;
and the second target value determining submodule is used for taking the temperature of the first outlet as the target temperature of the first outlet if the energy consumption increment of the cooling water pump is larger than that of the cooling tower, and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the method comprises the steps of obtaining sampling data, and then calculating a first temperature difference value, a second temperature difference value and a third temperature difference value according to the sampling data; when the third temperature difference value is in a set range, correspondingly calculating the energy consumption increment; then determining the target temperatures corresponding to the cooling water pump and the cooling tower; respectively controlling the cooling water pump and the cooling tower to carry out frequency regulation according to the target temperatures corresponding to the cooling water pump and the cooling tower by adopting a PID algorithm; because the frequency is adjusted according to the target temperature determined by the energy consumption increment, and the energy consumption increment is obtained by calculating according to the acquired sampling data, the frequency can be automatically adjusted in time according to the actual sampling data, so that the energy consumption is in a balanced state, namely, the energy consumption is not increased any more in the adjusting process through the automatic adjustment of the frequency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for adjusting heat exchange frequency according to an embodiment of the present invention;
fig. 2 is a structural diagram of a heat exchange frequency adjustment system according to an embodiment of the present invention.
Description of the symbols:
the device comprises a sampling data acquisition module-1, a temperature difference value calculation module-2, an energy consumption increment calculation module-3, a target temperature determination module-4 and a frequency regulation control module-5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide a heat exchange frequency adjusting method and a heat exchange frequency adjusting system, which are used for automatically adjusting the frequency, realizing the timely adjustment of the frequency and reducing the energy consumption.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example 1
The embodiment provides a heat exchange frequency adjusting method, which is used for adjusting a heat exchange system; the adjusting heat exchange system comprises a cooling water pump, a cooling tower and a heat exchanger; the outlet of the cooling tower is connected with the inlet of the heat exchanger; a first outlet of the heat exchanger is connected with an inlet of the cooling tower through a cooling water pump; and the second outlet of the heat exchanger is communicated with the outside.
As shown in fig. 1, the adjusting method includes:
step 100: acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data includes a temperature of the inlet of the heat exchanger, a temperature of the first outlet, and a temperature of the second outlet.
Step 200: calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; and calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet.
Step 300: and when the third temperature difference value is in the set range, calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower.
The specific calculation process is as follows:
ΔT 1 ＝T 2 -T 3
ΔT 2 ＝T 3 -T 4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 Is the set temperature of the second outlet, T 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
Step 400: and determining the target temperature of the first outlet and the target temperature of the inlet according to the energy consumption increment of the cooling water pump, the energy consumption increment of the cooling tower, the temperature of the first outlet, the temperature of the inlet and the third temperature difference value.
Specifically, if the energy consumption increment of the cooling water pump is smaller than or equal to the energy consumption increment of the cooling tower, the temperature of the first outlet is added to the third temperature difference value to obtain the target temperature of the first outlet, and the temperature of the inlet is used as the target temperature of the inlet.
And if the energy consumption increment of the cooling water pump is larger than that of the cooling tower, taking the temperature of the first outlet as the target temperature of the first outlet, and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet.
Step 500: controlling a cooling water pump to adjust the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
Specifically, the adjusting method further includes: before step 100, further comprising:
and judging whether the operation time of the heat exchange system is longer than a set steady-state period.
And if the operation duration of the heat exchange system is adjusted to be longer than the set steady-state period, acquiring the temperature of the inlet of the heat exchanger at the current moment and the temperature of the first outlet of the heat exchanger at the current moment, and executing a primary adjustment process.
When the adjusting time length of the preliminary adjusting process is longer than the set adjusting period, executing the step of acquiring the sampling data, namely executing the step 100: sample data is acquired.
The primary adjustment process is as follows:
and controlling a cooling water pump to adjust the frequency of the cooling water pump according to the temperature of the first outlet at the current moment and controlling a cooling tower to adjust the frequency of the cooling tower according to the temperature of the inlet at the current moment by adopting a PID algorithm.
Example 2
As shown in fig. 2, an embodiment of the present invention provides a heat exchange frequency adjustment system, which is used to implement the heat exchange frequency adjustment method in any one of embodiments 1.
The conditioning system includes: the device comprises a sampling data acquisition module 1, a temperature difference value calculation module 2, an energy consumption increment calculation module 3, a target temperature determination module 4 and a frequency regulation control module 5.
The sampling data acquisition module 1 is used for acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data includes a temperature of the inlet of the heat exchanger, a temperature of the first outlet, and a temperature of the second outlet.
The temperature difference value calculating module 2 is used for calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; and calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet.
And the energy consumption increment calculating module 3 is used for calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower when the third temperature difference value is within the set range.
The energy consumption increment calculation module 3 specifically comprises:
ΔT 1 ＝T 2 -T 3
ΔT 2 ＝T 3 -T4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 For a set temperature of the second outlet, T 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
And the target temperature determination module 4 is used for determining the target temperature of the first outlet and the target temperature of the inlet according to the energy consumption increment of the cooling water pump, the energy consumption increment of the cooling tower, the temperature of the first outlet, the temperature of the inlet and the third temperature difference value.
Specifically, the target temperature determination module 4 includes: a first target value determination submodule and a second target value determination submodule.
A first target value determining submodule, configured to add the temperature of the first outlet to the third temperature difference value to obtain a target temperature of the first outlet if the energy consumption increment of the cooling water pump is smaller than or equal to the energy consumption increment of the cooling tower; taking the temperature of the inlet as a target temperature of the inlet;
and the second target value determining submodule is used for taking the temperature of the first outlet as the target temperature of the first outlet if the energy consumption increment of the cooling water pump is larger than that of the cooling tower, and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet.
The frequency regulation control module 5 is used for controlling the cooling water pump to regulate the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
Specifically, the adjustment system further comprises: the device comprises a first judgment module, a second judgment module, a preliminary adjustment module and a preliminary frequency adjustment control module.
And the first judgment module is used for judging whether the operation time length of the heat exchange system is adjusted to be greater than the set steady-state period.
And the preliminary adjusting module is used for acquiring the temperature of the inlet of the heat exchanger at the current moment and the temperature of the first outlet of the heat exchanger at the current moment and executing the frequency adjusting preliminary control module if the operation duration of the heat exchange system is adjusted to be longer than the set steady-state period.
And the second judgment module is used for executing the 'sampling data acquisition module' when the adjusting time length of the frequency adjusting preliminary control module is greater than the set adjusting period.
And the frequency regulation primary control module is used for controlling the cooling water pump to regulate the frequency of the cooling water pump according to the temperature of the first outlet at the current moment and controlling the cooling tower to regulate the frequency of the cooling tower according to the temperature of the inlet at the current moment by adopting a PID algorithm.
In practical application, the specific implementation flow of the invention is as follows:
1. heat exchanger object: obtaining T of a second outlet temperature from the subject 1 Temperature T of the first outlet 2 And the temperature T of the inlet 3 。
2. An external environment object: obtaining air wet bulb temperature T from the subject 4 。
3. Cooling tower object: acquiring the operating frequency and the energy consumption of the cooling tower from the object; the object receives a frequency setting instruction to realize the control of the operating frequency of the cooling tower.
4. Cooling tower incremental PID object: the object is to use the temperature T of the inlet 3 Mesh of importTarget temperature T 3 object And calculating parameters such as the current operating frequency of the cooling tower, and the like, thereby obtaining a frequency set value of the cooling tower.
5. Cooling water pump object: acquiring the operating frequency and the energy consumption increment of the cooling water pump from the object; the object receives a frequency setting instruction to realize the control of the operating frequency of the cooling water pump.
6. Incremental PID objects of cooling water pump: temperature T of the object using the first outlet 2 Target temperature T of first outlet 2 object And calculating parameters such as the current operating frequency of the cooling water pump, so as to obtain a frequency set value of the cooling water pump.
The specific implementation steps are as follows:
step 1: the parameters preset manually comprise: set temperature T of the second outlet 0 (set according to process requirements on the use side, i.e. the second outlet), steady state period t Steady state Adjusting the period t Regulating 。
Step 2: starting the steady-state timing t of the system, and when the timing t is more than or equal to t Steady state And entering step 3, otherwise, continuing to count time.
And step 3: calculating the cooling water temperature difference, namely the first temperature difference delta T 1 Approaching the temperature difference, i.e. the second temperature difference Δ T 2 Target temperature T of the first outlet 2 object Target temperature T of the inlet 3 object Then, step 4 is entered.
ΔT 1 ＝T 2 -T 3 ；
ΔT 2 ＝T 3 -T 4 ；
T 2 object ＝T 2 ；
T 3 object ＝T 3 ；
And 4, step 4: will T 2 objects Sent to the cooling water pump incremental PID object, T 3 object Sent to the cooling tower incremental PID object and then proceeds to step 5.
And 5: starting to adjust the timing t, when the timing t is more than or equal to t Regulating Step 6 is entered, otherwise, the timing is continued.
Step 6: calculating Delta T 1 、ΔT 2 Then, the process proceeds to step 7.
And 7: calculating a third temperature difference value delta T 3 。
If Δ T 3 Less than or equal to-0.5 or delta T 3 And (5) if the value is more than or equal to 0.5, entering the step 8, otherwise, entering the step 5.
ΔT 3 ＝T 0 -T 1 。
And 8: the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower are added, and then the step 9 is carried out.
Wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 Is the energy consumption of the cooling tower.
And step 9: if Δ P 1 ≤ΔP 2 Then calculating the target temperature T of the first outlet 2 object And target temperature T of the inlet 3 object Then returns to step 4, otherwise step 10 is entered.
T 2 object ＝T 2 +ΔT 3 ；
T 3 object ＝T 3 。
Step 10: calculating a target temperature T of the first outlet 2 object And target temperature T of the inlet 3 object And finally returning to the step 4.
T 2 object ＝T 2 ；
T 3 object ＝T 3 +ΔT 3 。
The problems solved by the invention are as follows:
1. the temperature of the second outlet is sampled and a corresponding target value, namely the target temperature, is established, so that the change of the cold quantity requirement of the second outlet can be correctly tracked.
2. The temperature of the first outlet, the temperature of the inlet and the temperature of the air wet bulb are sampled, so that the cooling water temperature difference, namely a first temperature difference value, and the approach temperature difference, namely a second temperature difference value (the temperature of the inlet minus the temperature of the air wet bulb) are calculated, and data are provided for subsequent calculation.
3. And (4) sampling energy consumption data of the cooling water pump and the cooling tower, namely sampling energy consumption, and providing data for subsequent calculation.
4. When the cold quantity demand of the second outlet is increased, the energy consumption increment corresponding to the frequency of the cooling water pump and the frequency of the cooling tower which are independently increased is calculated according to the current running condition, and then the target temperatures of the first outlet and the inlet are calculated according to the condition that the energy consumption increment is small, so that the frequency of the cooling water pump and the cooling tower are adjusted.
5. When the cold quantity requirement of the second outlet is reduced, the energy consumption reduction amount corresponding to the frequency of the cooling water pump and the frequency of the cooling tower which are independently reduced is calculated according to the current running condition, and then the target temperatures of the first outlet and the inlet are calculated according to the condition that the energy consumption reduction amount is large, so that the frequency of the cooling water pump and the cooling tower are adjusted.
The invention has the advantages that:
1. the automatic adjustment process reduces the degree of participation of the staff and the degree of dependence on personal experience.
2. The cold quantity demand according to the second export carries out automatically regulated, has ensured cold quantity supply.
3. And the equipment is subjected to optimized combination control, so that the running energy consumption of the equipment is reduced.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (8)
1. A heat exchange frequency regulation method is characterized in that the regulation method is used for regulating a heat exchange system;
the adjusting heat exchange system comprises a cooling water pump, a cooling tower and a heat exchanger; the outlet of the cooling tower is connected with the inlet of the heat exchanger; the first outlet of the heat exchanger is connected with the inlet of the cooling tower through the cooling water pump; a second outlet of the heat exchanger is communicated with the outside;
the adjusting method comprises the following steps:
acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data comprises a temperature of an inlet of the heat exchanger, a temperature of a first outlet, and a temperature of a second outlet;
calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet;
when the third temperature difference value is in a set range, calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower;
determining a target temperature of the first outlet and a target temperature of the inlet according to the energy consumption increment of the cooling water pump, the energy consumption increment of the cooling tower, the temperature of the first outlet, the temperature of the inlet and the third temperature difference value;
controlling the cooling water pump to adjust the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
2. The heat exchange frequency adjustment method according to claim 1, characterized in that the adjustment method further comprises: before the acquiring of the sampling data, the method further comprises:
judging whether the operation time length of the heat exchange adjusting system is greater than a set steady state period or not;
if the operation duration of the heat exchange system is longer than the set steady state period, acquiring the temperature of an inlet of the heat exchanger at the current moment and the temperature of a first outlet of the heat exchanger at the current moment, and executing a primary adjusting process;
when the adjusting time length of the preliminary adjusting process is longer than the set adjusting period, executing the step of acquiring sampling data;
the preliminary adjustment process is as follows:
and controlling the cooling water pump to adjust the frequency of the cooling water pump according to the temperature of the first outlet at the current moment and controlling the cooling tower to adjust the frequency of the cooling tower according to the temperature of the inlet at the current moment by adopting a PID algorithm.
3. The method according to claim 1, wherein when the third temperature difference value is within a set range, correspondingly calculating an energy consumption increment according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump, and the energy consumption of the cooling tower, specifically:
ΔT 1 ＝T 2 -T 3
ΔT 2 ＝T 3 -T 4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference value, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 Is the set temperature, T, of the second outlet 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
4. The method according to claim 1, wherein the determining the target temperature of the first outlet and the target temperature of the inlet according to the increment of the energy consumption of the cooling water pump, the increment of the energy consumption of the cooling tower, the temperature of the first outlet, the temperature of the inlet, and the third temperature difference value specifically comprises:
if the energy consumption increment of the cooling water pump is smaller than or equal to the energy consumption increment of the cooling tower, adding the temperature of the first outlet and the third temperature difference value to obtain the target temperature of the first outlet, and taking the temperature of the inlet as the target temperature of the inlet;
and if the energy consumption increment of the cooling water pump is larger than that of the cooling tower, taking the temperature of the first outlet as the target temperature of the first outlet, and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet.
5. A heat exchange frequency adjustment system, characterized in that the adjustment system is used for implementing the heat exchange frequency adjustment method of any one of claims 1 to 4;
the conditioning system comprises:
the sampling data acquisition module is used for acquiring sampling data; the sampling data includes: the air wet bulb temperature, the energy consumption of a cooling water pump, the energy consumption of a cooling tower and the temperature data of a heat exchanger; the temperature data comprises a temperature of an inlet of the heat exchanger, a temperature of a first outlet, and a temperature of a second outlet;
the temperature difference value calculating module is used for calculating to obtain a first temperature difference value according to the temperature of the first outlet and the temperature of the inlet; calculating to obtain a second temperature difference value according to the temperature of the inlet and the temperature of the air wet bulb; calculating to obtain a third temperature difference value according to the temperature of the second outlet and the set temperature of the second outlet;
the energy consumption increment calculating module is used for calculating the energy consumption increment of the cooling water pump and the energy consumption increment of the cooling tower according to the first temperature difference value, the second temperature difference value, the third temperature difference value, the energy consumption of the cooling water pump and the energy consumption of the cooling tower when the third temperature difference value is in a set range;
a target temperature determination module, configured to determine a target temperature of the first outlet and a target temperature of the inlet according to an energy consumption increment of the cooling water pump, an energy consumption increment of the cooling tower, a temperature of the first outlet, a temperature of the inlet, and the third temperature difference value;
the frequency regulation control module is used for controlling the cooling water pump to regulate the frequency of the cooling water pump by adopting a PID algorithm according to the target temperature of the first outlet; and controlling the cooling tower to adjust the frequency of the cooling tower according to the target temperature of the inlet.
6. The heat exchange frequency adjustment system of claim 5, further comprising:
the first judgment module is used for judging whether the operation time length of the heat exchange regulation system is greater than a set steady-state period or not;
the preliminary adjusting module is used for acquiring the temperature of an inlet of the heat exchanger at the current moment and the temperature of a first outlet of the heat exchanger at the current moment and executing the preliminary frequency adjusting control module if the operation duration of the heat exchange adjusting system is longer than a set steady state period;
the second judgment module is used for executing the sampling data acquisition module when the adjusting time length of the frequency adjusting preliminary control module is greater than a set adjusting period;
and the frequency regulation primary control module is used for controlling the cooling water pump to regulate the frequency of the cooling water pump according to the temperature of the first outlet at the current moment by adopting a PID algorithm and controlling the cooling tower to regulate the frequency of the cooling tower according to the temperature of the inlet at the current moment.
7. The heat exchange frequency adjustment system according to claim 5, wherein the energy consumption increment calculation module specifically is:
ΔT 1 ＝T 2 -T 3
ΔT 2 ＝T 3 -T 4
ΔT 3 ＝T 0 -T 1 ；
wherein, Δ P 1 For incremental energy consumption of cooling water pumps, P 1 For cooling water pump energy consumption, Δ P 2 For incremental energy consumption of cooling towers, P 2 For cooling tower energy consumption, Δ T 1 Is the first temperature difference, Δ T 2 Is the second temperature difference value, Δ T 3 Is the third temperature difference value, T 0 For a set temperature of the second outlet, T 1 Is the temperature of the second outlet, T 2 Is the temperature of the first outlet, T 3 Is the temperature of the inlet, T 4 Is the air wet bulb temperature.
8. The heat exchange frequency adjustment system according to claim 5, wherein the target temperature determination module specifically comprises:
a first target value determining submodule, configured to add the temperature of the first outlet to the third temperature difference value to obtain a target temperature of the first outlet if the energy consumption increment of the cooling water pump is smaller than or equal to the energy consumption increment of the cooling tower; taking the temperature of the inlet as a target temperature of the inlet;
and the second target value determination submodule is used for taking the temperature of the first outlet as the target temperature of the first outlet and adding the temperature of the inlet and the third temperature difference value to obtain the target temperature of the inlet if the energy consumption increment of the cooling water pump is larger than that of the cooling tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210874799.1A CN115235286B (en) | 2022-07-25 | 2022-07-25 | Heat exchange frequency adjusting method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210874799.1A CN115235286B (en) | 2022-07-25 | 2022-07-25 | Heat exchange frequency adjusting method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115235286A true CN115235286A (en) | 2022-10-25 |
| CN115235286B CN115235286B (en) | 2023-04-04 |
Family
ID=83676193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210874799.1A Active CN115235286B (en) | 2022-07-25 | 2022-07-25 | Heat exchange frequency adjusting method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115235286B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485254A (en) * | 2022-02-18 | 2022-05-13 | 佳木斯大学 | Uniform heat exchange control method for aircraft equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150377535A1 (en) * | 2013-04-08 | 2015-12-31 | Fuji Electric Co., Ltd. | Control apparatus for cooling system |
| CN107806695A (en) * | 2016-08-29 | 2018-03-16 | 广东迪奥技术有限公司 | The energy-saving control device and its control method of a kind of air conditioning cooling water system |
| CN112377996A (en) * | 2020-11-18 | 2021-02-19 | 厦门烟草工业有限责任公司 | Air conditioning system and control method thereof |
| CN112665132A (en) * | 2020-12-24 | 2021-04-16 | 珠海格力电器股份有限公司 | Air conditioning system, energy-saving control method and device for cooling side of air conditioning system and controller |
| CN114440409A (en) * | 2022-01-11 | 2022-05-06 | 华设设计集团股份有限公司 | Self-adaptive energy-saving control method for central air-conditioning system |
-
2022
- 2022-07-25 CN CN202210874799.1A patent/CN115235286B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150377535A1 (en) * | 2013-04-08 | 2015-12-31 | Fuji Electric Co., Ltd. | Control apparatus for cooling system |
| CN107806695A (en) * | 2016-08-29 | 2018-03-16 | 广东迪奥技术有限公司 | The energy-saving control device and its control method of a kind of air conditioning cooling water system |
| CN112377996A (en) * | 2020-11-18 | 2021-02-19 | 厦门烟草工业有限责任公司 | Air conditioning system and control method thereof |
| CN112665132A (en) * | 2020-12-24 | 2021-04-16 | 珠海格力电器股份有限公司 | Air conditioning system, energy-saving control method and device for cooling side of air conditioning system and controller |
| CN114440409A (en) * | 2022-01-11 | 2022-05-06 | 华设设计集团股份有限公司 | Self-adaptive energy-saving control method for central air-conditioning system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485254A (en) * | 2022-02-18 | 2022-05-13 | 佳木斯大学 | Uniform heat exchange control method for aircraft equipment |
| CN114485254B (en) * | 2022-02-18 | 2023-10-10 | 佳木斯大学 | Uniform heat exchange control method for aircraft equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115235286B (en) | 2023-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104359195B (en) | Based on the central air-conditioning freezing water controling method that dynamic response end total load changes | |
| CN108662735B (en) | Energy-saving optimization control system and method for terminal equipment of central air-conditioning system | |
| CN112899726A (en) | Water electrolysis hydrogen production system and control method thereof | |
| CN206360877U (en) | A kind of optimal control for energy saving system of variable frequency pump parallel running | |
| JP2007315695A (en) | Cold and hot water control method for cold and heat source machine, and air conditioning system using it | |
| CN115235286B (en) | Heat exchange frequency adjusting method and system | |
| CN204719557U (en) | A kind of cooling control system of temperature control device | |
| CN104534917A (en) | Energy-saving control device and method for closed cooling circulation system | |
| CN104315683A (en) | Fuzzy PID (proportion integration differentiation) -based water-cooled air conditioner regulation and control method | |
| CN109654887B (en) | Circulating water cooling system and automatic control method thereof | |
| CN110736129A (en) | Intelligent balance regulation and control system and method for urban heat supply pipe networks | |
| CN113701321A (en) | Energy-saving frequency conversion control method for central air-conditioning water pump | |
| CN113809440B (en) | Control method and system for coolant flow of liquid-cooled power battery and automobile | |
| CN112594775A (en) | Control method for air source heat supply backwater temperature | |
| CN204880702U (en) | Air -source heat bump water heater of intelligent regulation temperature | |
| CN108334124A (en) | Equipment Water temperature control device and control method | |
| CN107559946B (en) | Secondary pump controller of heat exchange station | |
| CN104914891A (en) | Cooling control system for temperature control device | |
| CN109945443A (en) | Concentrate the energy-saving control method and system of energy supply | |
| CN112050536B (en) | Constant-temperature cooling water circulation supply system and circulation supply method | |
| CN209655821U (en) | A kind of circulating water cooling system | |
| CN113865018A (en) | Method and system for regulating and controlling power of main unit of water-cooling central air conditioner | |
| CN114517930A (en) | Heat supply regulation method and device of heat supply network heat exchange station integrating mechanism and data | |
| CN220355607U (en) | Temperature control system and air conditioner | |
| CN220338600U (en) | Temperature control system and air conditioner |
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 |