CN210107618U - Cooling water system - Google Patents
Cooling water system Download PDFInfo
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- CN210107618U CN210107618U CN201920914754.6U CN201920914754U CN210107618U CN 210107618 U CN210107618 U CN 210107618U CN 201920914754 U CN201920914754 U CN 201920914754U CN 210107618 U CN210107618 U CN 210107618U
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Abstract
The utility model discloses a cooling water system, including a plurality of refrigerating unit, cooling water return circuit, the parallelly connected cooling water pump that sets up on the cooling water return circuit of a plurality of, parallelly connected cooling water branch road of setting on the cooling water return circuit, parallelly connected a plurality of cooling tower of setting on the cooling water branch road, be equipped with the fan in the cooling tower, wherein the cooling water return circuit includes inlet manifold and return manifold, and the cooling water branch road includes inlet branch pipe and return branch pipe, its characterized in that: still be equipped with cooling system balance control ware be equipped with the house steward flow balance valve that is used for controlling the total volume of intaking on the water inlet manifold, at each be equipped with the branch pipe flow balance valve that is used for controlling cooling tower inflow flow respectively on the water inlet branch pipe, cooling system balance control ware is used for receiving the real-time flow data of house steward flow balance valve and branch pipe flow balance valve, and controls the cooling tower is opened and is shut down and the aperture of fan rotational speed and branch pipe flow balance valve. The utility model discloses system hydraulic balance, the operation is energy-conserving stable.
Description
Technical Field
The utility model relates to a cooling water balance regulation and control technique especially relates to a variable flow cooling water system water balance regulation and control technique.
Background
The common central air-conditioning system comprises a plurality of refrigerating units, a plurality of circulating water pumps and a plurality of cooling towers, wherein the refrigerating units provide chilled water for supplying a fan coil for heat exchange, the circulating water pumps drive cooling water to circulate between the refrigerating units and the cooling towers, the cooling water exchanges heat with air in the cooling towers, and the cooled cooling water is sent to the refrigerating units for cooling through the circulating water pumps. The central air-conditioning system is provided with a cooling water system, and the main purpose of the cooling water system is to exchange heat between the heat of the condenser and the atmosphere to obtain low-temperature water for the central air-conditioning unit to operate. The cooling water temperature has a great influence on the energy consumption of the central air-conditioning system, and according to data provided by various mainstream air-conditioning manufacturers, the energy consumption of the host can be increased by 3-5% when the cooling water temperature is increased by 1%, and the energy consumption of the host can be reduced by 3-5% when the cooling water temperature is decreased by 1%. Therefore, the improvement of the heat exchange capacity of the cooling tower in the cooling water system has great influence on the energy conservation of the whole system.
The cooling water system of a common central air conditioning system is composed of the following forms:
1. a plurality of circulating water pipelines are directly established by adopting a single refrigerating unit and a single circulating water pump corresponding to a single cooling tower. The mode can respectively adjust the water quantity of the single circulating water pipeline, and can also add frequency conversion control of the cooling tower. However, in this way, when a certain device fails, the interchangeability is poor, the large heat dissipation area of the cooling tower group cannot be utilized for heat exchange, the efficient energy-saving mode with small water volume and large temperature difference cannot be realized, and no help is provided for the energy saving of the whole air conditioning system. In addition, although the cooling tower can adopt variable frequency control, the circulating water pipeline can only realize individual adjustment, so that the control range of low rotating speed during variable frequency is small, the noise is large, and the energy-saving effect of multi-low-frequency operation cannot be realized.
2. The cooling water system is arranged in a mode of supplying water in the same process, namely, the distances from the circulating water pump to the water supply ports of the cooling towers are basically the same, the water supply pressure is the same, and the cooling water supply pipeline needs to be changed from the original two-pipe design into the three-pipe design. The reason for adopting this kind of mode is because there is the precedence order in the different cooling towers that connect on the pipeline, can lead to the front and back water resistance different, and the actual inflow also has very big influence, and the cooling tower water flow that is close to the water pump end is great, appears overflowing the situation, and the dish cooling water of broadcasting can produce the overflow when too much, leads to directly getting into the circulation without cooling heat dissipation, and the cooling tower who keeps away from the water pump end has the undercurrent phenomenon, and the radiating efficiency receives the influence. By adopting the same-process water supply mode, the same water supply pressure of different cooling towers can be effectively realized, thereby avoiding the situations of over-flow or under-flow. However, the addition of one tube has the following disadvantages: because central air conditioning unit and circulating water pump set up in the basement more, and the cooling tower sets up in the outdoor of circulation of air more, and the pipeline distance is far away, increases the pipeline and must lead to equipment investment cost and construction cost to increase by a wide margin, and adds the pipeline and can increase valve equipment simultaneously, and cooling water system's resistance also correspondingly increases, and the circulating water pump also need increase the lift, and long-term operation energy consumption also correspondingly increases.
Therefore, in order to improve the efficiency of the cooling system and obtain the maximum energy saving effect, the flow rate of the cooling water circulation circuit is controlled as required.
Aiming at the problems, when the constant-flow central air-conditioning cooling system is debugged, the valve of the cooling water system is manually adjusted by the experience of an old master, so that the relative hydraulic distribution is uniform. However, the debugging is based on the debugging of all water pumps under the conditions of full opening and full load, the low flow condition is realized in most of the time when the system is actually operated, the flow rate of circulating water is changed at any time due to the coincidence of the central air conditioning unit, and the initial debugging does not have too many functions and effects in the daily application of the system.
Disclosure of Invention
The utility model aims at providing a simple structure, construction convenience just are convenient for adjust the balanced cooling water system of system.
The technical solution of the utility model is that: a cooling water system comprises a plurality of refrigerating units, a cooling water loop, a plurality of cooling water pumps arranged on the cooling water loop in parallel, a cooling water branch arranged on the cooling water loop in parallel, a plurality of cooling towers arranged on the cooling water branch in parallel, wherein a fan is arranged in each cooling tower, wherein the cooling water loop comprises a water inlet main pipe and a water return main pipe, the cooling water branch comprises a water inlet branch pipe and a water return branch pipe, and a cooling system balance controller is also arranged, the cooling system comprises a water inlet main pipe, a water inlet branch pipe, a cooling system balance controller and a fan, wherein the water inlet main pipe is provided with a main pipe flow balance valve used for controlling the total water inlet amount, each water inlet branch pipe is provided with a branch pipe flow balance valve used for controlling the water inlet flow of the cooling tower, the cooling system balance controller is used for receiving real-time flow data of the main pipe flow balance valve and the branch pipe flow balance valves and controlling the opening of the cooling tower, the rotating speed of the fan and the opening of the branch pipe flow balance valves.
The main pipe flow balance valve is arranged on the water inlet main pipe, the total water inlet amount entering the cooling tower can be detected and controlled, the water flow of the system is controlled and adjusted on the whole, the branch pipe flow balance valve is arranged on the water inlet branch pipe, the water inlet amount of each cooling tower can be independently controlled, the cooling system balance controller determines the actual water inlet amount of each cooling tower according to the working state of each cooling tower on the basis of receiving the total water inlet amount of the water inlet main pipe, the water amount entering each cooling tower is adjusted by adjusting the opening degree of the corresponding branch pipe flow balance valve, when the total water amount is reduced, the total water amount can be reasonably distributed to the started partial cooling towers by stopping the partial cooling towers and controlling the water inlet amount actually entering the cooling towers according to the distribution flow value, so that the whole water system is balanced and controlled, and the over-current or under-current condition caused by water imbalance is avoided, the cooling water supply with low flow and large temperature difference is realized, the energy-saving effect is realized to the maximum extent, the construction is also convenient, the project cost is saved, the installation flow is simplified, and the quick modification on the existing cooling tower foundation is facilitated.
And a temperature sensor for detecting the return water temperature is respectively arranged on each return water branch pipe, and signals are output to the cooling system balance controller. The temperature sensor is used for detecting the return water temperature so as to find out the cooling tower with fault or reduced heat exchange capacity in time, and the energy-saving efficiency of the system is guaranteed.
The utility model has the advantages that: the hydraulic balance of the system can be realized, the operation is more stable, the cooling tower can realize controllable heat exchange in the working range, the temperature and the flow of cooling water are ensured to be constant, the energy conservation to the maximum extent is favorably realized, the construction is convenient, the manufacturing cost is low, the transformation and the modification are easy, and the economic effect of long-term operation is higher.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
1. the system comprises a refrigerating unit, 2, a cooling water pump, 3, a cooling tower, 4, a main pipe flow balance valve, 5, a branch pipe flow balance valve, 6, a branch pipe flow sensor, 7, a main pipe flow sensor, 8, a temperature sensor, 9, a cooling system balance controller, 10, a cooling water pump variable frequency controller, 11, a water inlet main pipe, 12, a water return main pipe, 13, a water inlet branch pipe, 14 and a water return branch pipe.
Detailed Description
Example (b):
referring to fig. 1, a cooling water system comprises a plurality of refrigerating units 1, a cooling water loop, a plurality of cooling water pumps 2 arranged on the cooling water loop in parallel, a cooling water branch arranged on the cooling water loop in parallel, a plurality of cooling towers 3 arranged on the cooling water branch in parallel, a fan arranged in each cooling tower 3, wherein the cooling water loop comprises a water inlet main pipe 11 and a water return main pipe 12, the cooling water branch comprises a water inlet branch pipe 13 and a water return branch pipe 14, a cooling system balance controller 9 and a cooling water pump variable frequency controller 10 are also arranged, a main pipe flow balance valve 4 for controlling the total amount of inlet water is arranged on the water inlet main pipe 11, a branch pipe flow balance valve 5 for controlling the inlet flow of the cooling tower 3 is respectively arranged on each water inlet branch pipe 13, a temperature sensor 8 for detecting the temperature of return water is respectively arranged on each water return branch pipe 12, and signals are output to the cooling system balance controller 9 and the cooling water pump variable frequency controller 10, and the cooling system balance controller 9 is used for receiving data output by the temperature sensor 8 and real-time flow data of the main pipe flow balance valve 4 and the branch pipe flow balance valve 5, and controlling the start and stop of the cooling tower 3, the rotating speed of the fan and the opening of the branch pipe flow balance valve 5. And the cooling water pump frequency conversion controller 10 is used for receiving the backwater temperature data of the temperature sensor 8 and controlling the start, stop and frequency conversion of the cooling water pump 2.
The main pipe flow balance valve 4 is arranged on the water inlet main pipe 11, the total water inlet amount entering the cooling towers 3 can be detected and controlled, the water flow of the system is controlled and adjusted on the whole, the branch pipe flow balance valve 5 is arranged on the water inlet branch pipe 13, the water inlet amount of each cooling tower 3 can be independently controlled, the cooling system balance controller 10 determines the actual water inlet amount of each cooling tower 3 according to the working state of each cooling tower 3 on the basis of receiving the total water inlet amount of the water inlet main pipe, the water amount entering each cooling tower 3 is adjusted by adjusting the opening degree of the corresponding branch pipe flow balance valve 5, when the total water amount is reduced, the whole water system can be balanced and controlled by stopping part of the cooling towers 3 and reasonably distributing the total water amount to the started part of the cooling towers 3 and controlling the actual water inlet amount entering the cooling towers 3 according to the distribution flow value, the cooling tower has the advantages that the over-flow or under-flow condition caused by unbalanced hydraulic power is avoided, the cooling water supply with low flow and large temperature difference is realized, the energy-saving effect is realized to the maximum extent, the construction is also convenient, the project cost is saved, the installation flow is simplified, and the quick modification on the basis of the existing cooling tower is facilitated.
A control method of a cooling water system comprises the following steps which are executed simultaneously or sequentially:
①, detecting the total water inlet flow parameter in the water inlet main pipe 11, determining the number of the cooling towers 3 which are started according to the minimum water inlet flow value of each cooling tower 3, wherein the minimum water inlet flow value of each cooling tower 3 is determined by multiplying the standard flow of the cooling tower 3 by a variable flow coefficient, the number of the cooling towers 3 which are started is determined by dividing the total water inlet flow by the minimum water inlet flow value of each cooling tower 3 and taking an integer, and assuming that the cooling tower 3 can not sleep uniformly when the standard flow is 30%, the variable flow coefficient is 30%, the total water inlet flow of the system divided by the standard flow of the cooling tower multiplied by 30% is N, and taking the integer of N as the number of the cooling towers which are started.
②, detecting the water inlet flow in each water inlet branch pipe 13, adjusting the opening of the branch pipe flow balance valve 5 according to the maximum water inlet flow value of each cooling tower 3, controlling the actual flow of the water inlet branch pipe to be less than or equal to the maximum water inlet flow value of the cooling tower, and limiting the flow of the cooling tower 3.
③, detecting the total water inflow rate in the water inlet main pipe 11 and the number of the cooling towers 3 in the starting state in real time, determining the average water inflow rate of each cooling tower 3 in the starting state, wherein the total cooling water flow divided by the number of the starting machines N is the average water inflow rate, and outputting the average water inflow rate as a real-time flow set value to each branch pipe flow balance valve 5 for adjusting the opening degree of each branch pipe flow balance valve 5;
④, detecting the water inlet flow in the water inlet branch pipe where the cooling tower is positioned in the shutdown state in real time, and outputting a maintenance alarm when the detected water inlet flow is more than 0;
⑤, detecting the real-time backwater temperature in each backwater branch pipe, comparing the real-time backwater temperature with the backwater temperature set value of each backwater branch pipe, and outputting a maintenance alarm corresponding to the backwater branch pipe when the real-time backwater temperature exceeds the set value by 0.3 ℃.
The total water inlet flow of the water inlet main pipe is determined so as to conveniently confirm the starting number of the cooling towers, and under the condition that the total water inlet flow is less than the sum of the water inlet flows of all the cooling towers, part of the cooling towers are stopped, so that the heat exchange capacity of the cooling towers can be fully exerted, and the reduction of the energy consumption of the whole cooling tower is facilitated; the water inlet flow of the water inlet branch pipe is detected, so that the actual water inlet can be controlled according to the designed water inlet amount of the cooling tower, and the uneven water inlet caused by the long and short pipe distance is avoided; according to the total water quantity and the number of the cooling towers which are started up, the average water inlet flow of each cooling tower in the running state is determined, the actual water inlet quantity is controlled through the branch pipe flow balance valve, the cooling towers which are started up can be fully ensured to run in the optimal running state, and the water supply balance of cooling water is realized; the total cooling water amount ijnx is monitored, the started cooling tower is determined according to the total water amount, and the started cooling tower is ensured to work in the optimal running state, so that the hydraulic balance is ensured on the whole, the running is more stable, and the energy conservation is realized to the maximum extent.
Through the branch pipe 13 flow of intaking that detects cooling tower 3 under the stall state, when the flow that detects is not equal to 0, explain this stall state cooling tower 3 breaks down, lead to intaking to take place, conveniently discover the cooling tower that breaks down, avoid not passing through radiating directly getting into in the cooling water return water pipeline of intaking, ensure holistic energy-conserving effect.
Through detecting the return water temperature of the return water branch pipe 14, the cooling tower with faults or reduced heat exchange capacity is found in time, the situation that inlet water which is not subjected to heat dissipation directly enters a cooling water return pipe is avoided, and the overall energy-saving effect is ensured.
For verifying the beneficial effects of the utility model, following explains through actual project transformation result:
four 250m hotels are adopted in the famous hotel project of a country in Guangzhou Zengcheng3The transverse flow cooling tower of/h is a hotel project with common scale. When the system is initially debugged, the balance debugging of the cooling water system is carried out according to 100% of flow, the opening degree of a water inlet valve of each cooling tower is adjusted, the water storage height of a water spreading disc of each cooling tower is 52-56mm, the water quantity of each cooling tower is determined to be basically balanced, and the water distribution of the cooling water is uniform.
Before transformation: the air conditioner is characterized in that a conventional energy-saving operation mode is adopted, only 2 air-conditioning hosts are started, the cooling water pump performs frequency conversion adjustment according to the temperature difference of inlet and outlet water of cooling water, when the cooling water pump performs frequency conversion operation for 2 air-conditioning hosts, the frequency is 40-42Hz, and the total flow of the cooling water is 426m3And h, starting 4 cooling towers, performing heat exchange by using the large heat dissipation area of the cooling towers, wherein the heights of water sowing disks of the 4 cooling towers are 46mm, 22mm, 18mm and 36mm respectively when the outdoor wet bulb temperature is 26.3 ℃ and the water inlet temperature is 32.1 ℃, and the water outlet temperatures of the cooling towers are 28.1 ℃, 28.5 ℃ and 28.2 ℃.
After transformation: adopt the utility model discloses the method carries out water balance transformation to water system, and same air conditioner host computer starts 2, and when 2, the frequency of cooling water pump frequency conversion operation was at 45Hz, and the cooling water total flow was 452m3And h, 4 cooling towers run, the heights of the water sowing trays of the 4 cooling towers are 34mm, 27mm, 26mm and 33mm respectively when the outdoor wet bulb temperature is 26.2 ℃ and the water inlet temperature is 32 ℃, the water outlet temperature of the cooling towers is stable and is 27.6 ℃, and the water supply balance of the cooling towers is basically realized.
Comparing two groups of data before and after modification shows that: when the cooling water before modification is in variable-flow operation, water supply balance is not realized, so that insufficient heat exchange is caused, the average water temperature is 28.3 ℃, after modification, the system realizes water balance, the heat exchange is uniform, the average water temperature is 27.6 ℃, the average water temperature is reduced by 0.7 ℃ compared with the average water temperature before modification, and the overall energy consumption of the air conditioning unit before modification is higher than that of the air conditioning unit after modification by more than 2 percent through statistical calculation. Adopt the utility model discloses a behind the calculation scheme, can effectively realize the water balance, reduce whole energy consumption, can effectively reduce use cost under the permanent use.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.
Claims (2)
1. The utility model provides a cooling water system, includes a plurality of refrigerating unit, cooling water return circuit, the parallelly connected cooling water pump that sets up on the cooling water return circuit of a plurality of, parallelly connected cooling water branch road that sets up on the cooling water return circuit, parallelly connected a plurality of cooling tower that sets up on the cooling water branch road, is equipped with the fan in the cooling tower, and wherein the cooling water return circuit includes inlet manifold and return manifold, and the cooling water branch road includes inlet branch pipe and return branch pipe, its characterized in that: still be equipped with cooling system balance control ware be equipped with the house steward flow balance valve that is used for controlling the total volume of intaking on the water inlet manifold, at each be equipped with the branch pipe flow balance valve that is used for controlling cooling tower inflow flow respectively on the water inlet branch pipe, cooling system balance control ware is used for receiving the real-time flow data of house steward flow balance valve and branch pipe flow balance valve, and controls the cooling tower is opened and is shut down and the aperture of fan rotational speed and branch pipe flow balance valve.
2. A cooling water system according to claim 1, characterized in that: and a temperature sensor for detecting the return water temperature is respectively arranged on each return water branch pipe, and signals are output to the cooling system balance controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920914754.6U CN210107618U (en) | 2019-06-17 | 2019-06-17 | Cooling water system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920914754.6U CN210107618U (en) | 2019-06-17 | 2019-06-17 | Cooling water system |
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| CN210107618U true CN210107618U (en) | 2020-02-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118405A (en) * | 2019-06-17 | 2019-08-13 | 广东新菱空调科技有限公司 | A kind of cooling water system and its control method |
| CN114623636A (en) * | 2022-05-17 | 2022-06-14 | 中国空气动力研究与发展中心高速空气动力研究所 | Circulating water system for classified regulation of cooling water temperature |
-
2019
- 2019-06-17 CN CN201920914754.6U patent/CN210107618U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118405A (en) * | 2019-06-17 | 2019-08-13 | 广东新菱空调科技有限公司 | A kind of cooling water system and its control method |
| CN110118405B (en) * | 2019-06-17 | 2024-08-20 | 广东新菱空调科技有限公司 | Cooling water system and control method thereof |
| CN114623636A (en) * | 2022-05-17 | 2022-06-14 | 中国空气动力研究与发展中心高速空气动力研究所 | Circulating water system for classified regulation of cooling water temperature |
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