CN108151207B - Rapid adjusting method for hydraulic balance of chilled water pipe network of central air conditioner - Google Patents

Rapid adjusting method for hydraulic balance of chilled water pipe network of central air conditioner Download PDF

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CN108151207B
CN108151207B CN201711405454.7A CN201711405454A CN108151207B CN 108151207 B CN108151207 B CN 108151207B CN 201711405454 A CN201711405454 A CN 201711405454A CN 108151207 B CN108151207 B CN 108151207B
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water supply
flow
supply loop
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chilled water
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谢笑坤
王珏
孙多斌
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Liaoning Technical University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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Abstract

The invention provides a quick adjustment method for hydraulic balance of a chilled water pipe network of a central air conditioner, and relates to the technical field of chilled water systems of central air conditioners. The method comprises the steps of firstly, collecting initial flow of each water supply loop on a water distributor of a chilled water system, and calculating the detuning amount of each loop; then regulating the flow of a certain water supply loop to reach a design value, recording the flow change of each loop under the working condition, recovering the flow of the loop to an initial value, and sequentially carrying out the same operation on other loops to obtain a flow influence coupling matrix; and finally, calculating the flow regulating quantity required by the loop to reach balance, and regulating the flow of each loop to ensure that the system reaches hydraulic balance. The method for rapidly adjusting the hydraulic balance of the chilled water pipe network of the central air conditioner greatly improves the efficiency of adjusting the hydraulic balance of the chilled water pipe network, solves the problems of uneven indoor cold and heat and energy waste caused by hydraulic imbalance of the chilled water pipe network of the central air conditioner, and simultaneously overcomes the defects of time consumption and labor consumption of the conventional adjusting method.

Description

Rapid adjusting method for hydraulic balance of chilled water pipe network of central air conditioner
Technical Field
The invention relates to the technical field of a chilled water system of a central air conditioner, in particular to a method for quickly adjusting hydraulic balance of a chilled water pipe network of the central air conditioner.
Background
The chilled water system of the central air conditioner of the current large-scale public building is large in scale generally, the pipeline is complex, and due to a series of problems generated in the design construction stage and the later operation stage, the hydraulic imbalance phenomenon generally exists in the system. The hydraulic imbalance of the chilled water system can cause the flow distribution of each loop and terminal equipment of the system to not reach the designed value, and directly causes the phenomenon of uneven cold and heat generated in each air conditioning area. To solve this problem, the pump head is usually increased blindly to meet the flow of the most unfavorable loop, but this causes a greater energy consumption for transportation.
The chilled water system is a complex pipe network system, coupling exists among loops, and the flow of the loops is often influenced by the change of the flow of a loop, so that a plurality of factors need to be considered in the adjustment work; meanwhile, because the unknown factors on the site are too many, the characteristics of elements such as a water pump, a valve and the like have certain correlation with the hydraulic characteristics of a pipe network, and therefore the implementation is very difficult. The commonly used hydraulic balance adjusting methods at present comprise a proportion adjusting method, a compensation method and a temperature adjusting method, and the methods usually take longer time, are complicated in operation process and have higher requirements on equipment. And the property personnel can perform coarse adjustment on the system by experience, but if the loops of the pipe network are too many, the coupling condition among the loops is very complex, and the purpose of adjustment is difficult to achieve without theoretical calculation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a quick adjusting method for hydraulic balance of a chilled water pipe network of a central air conditioner, which solves the problems of uneven indoor cold and heat and energy waste caused by hydraulic imbalance of the chilled water pipe network of the central air conditioner.
A quick adjustment method for hydraulic balance of a chilled water pipe network of a central air conditioner comprises the following steps:
step 1, for a chilled water system with b water supply loops, acquiring initial flow G ═ G of each water supply loop on a water separator when the chilled water system runs under actual working conditions by using an ultrasonic flowmeter1，G2，…，Gb]TWherein G isiThe initial flow of the ith water supply loop is 1, 2 … and b when the ith water supply loop operates under the actual working condition; the flow of each water supply loop when the chilled water system is in design condition operation is
Figure BDA0001520254680000011
Wherein the content of the first and second substances,
Figure BDA0001520254680000012
for the flow rate of the ith water supply loop in the design working condition operation, the detuning amount of each water supply loop is delta G ═ delta G1，ΔG2，…，ΔGb]TWherein, in the step (A),
Figure BDA0001520254680000013
the amount of detuning for the ith water supply loop;
step 2, adjusting the first water supply loopFrom the flow rate of the design condition to the flow rate of the design condition operation
Figure BDA0001520254680000014
Monitoring and recording the flow G 'of each water supply loop under the working condition after the system is stabilized'11、G′12、…、G′1bThe flow rate of each water supply loop is influenced by the first water supply loop to generate a flow rate variable quantity delta G11、ΔG12、…、ΔG1bWherein, Δ G1i＝G′1i-GiThe flow variation generated for the ith water supply loop influenced by the first water supply loop; after the variable quantity of the flow of each water supply loop is recorded, the flow of the first water supply loop is restored to G1；
And 3, sequentially adjusting the flow of other water supply loops to the flow when the water supply loops operate under the designed working condition according to the method in the step 2, monitoring and recording the flow of each water supply loop under the working condition after the system is stabilized, obtaining the flow variation of each water supply loop on other water supply loops due to the flow variation, and further obtaining a flow influence coupling matrix between the water supply loops on the water separator, wherein the flow influence coupling matrix is shown as the following formula:
Figure BDA0001520254680000021
step 4, calculating the flow to be regulated when each water supply loop reaches the design flow according to the flow influence coupling matrix among the water supply loops on the water separator and the detuning amount of each water supply loop, as shown in the following formula:
Figure BDA0001520254680000022
wherein the content of the first and second substances,
Figure BDA0001520254680000023
the flow rate required to be adjusted when the flow rate reaches the design flow rate for the ith water supply loop;
step 5, calculating according to the step 4 to obtain the requirement when each water supply loop reaches the design flowThe flow to be regulated is monitored by an ultrasonic flowmeter, and the flow of each loop is regulated to a transition flow in turn
Figure BDA0001520254680000024
Wherein the content of the first and second substances,
Figure BDA0001520254680000025
the transitional flow for the ith water supply loop; and when all the water supply loops of the water separator of the chilled water system are regulated, the chilled water system reaches the balance required by design, and the debugging is finished.
According to the technical scheme, the invention has the beneficial effects that: according to the method for quickly adjusting the hydraulic balance of the chilled water pipe network of the central air conditioner, under the condition that the misadjustment amount of each water supply loop of the chilled water system is relatively small, only one ultrasonic flowmeter is needed in the whole adjusting process, the flow of each water supply loop is adjusted in a flow monitoring mode to enable the chilled water system to achieve the hydraulic balance, the impedance and the valve characteristic of each water supply loop do not need to be identified, and the operation is easy. Meanwhile, the transition flow can balance the system by adjusting each water supply loop once without considering the coupling characteristic of the system in the adjusting process, thereby greatly improving the efficiency of the hydraulic balance adjustment of the chilled water pipe network, solving the problems of uneven indoor cooling and heating and energy waste caused by hydraulic imbalance of the chilled water pipe network of the central air conditioner and simultaneously improving the defects of time consumption and labor consumption of the existing adjusting method.
Drawings
FIG. 1 is a schematic diagram of a loop distribution structure of a chilled water system of a central air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for rapidly adjusting hydraulic balance of a chilled water pipe network of a central air conditioner according to an embodiment of the present invention.
Wherein: 1. a water supply loop; 2. a user; 3. and adjusting the valve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In this embodiment, taking a central air-conditioning chilled water system of an office building as shown in fig. 1 as an example, the method for rapidly adjusting the hydraulic balance of a chilled water pipe network of a central air-conditioning provided by the invention is used to adjust the flow of each loop of the chilled water system of the central air-conditioning, so as to solve the problems of uneven indoor cooling and heating and energy waste caused by hydraulic imbalance of the chilled water pipe network of the central air-conditioning.
The water separator of the central air-conditioning chilled water system shown in fig. 1 has b water supply loops 1, and each water supply loop comprises a regulating valve 3 capable of regulating the flow and a plurality of end users. The multiple end users contained in each water supply loop are equivalent to one user 2, and the designed flow rate of each water supply loop is the sum of the designed flow rates of all the users in the loop.
A method for rapidly adjusting the hydraulic balance of a chilled water pipe network of a central air conditioner is shown in figure 2 and comprises the following steps:
step 1, for a chilled water system with b water supply loops, acquiring initial flow G ═ G of each water supply loop on a water separator when the chilled water system runs under actual working conditions by using an ultrasonic flowmeter1，G2，…，Gb]TWherein G isiThe initial flow of the ith water supply loop is 1, 2 … and b when the ith water supply loop operates under the actual working condition; the flow of each water supply loop when the chilled water system is in design condition operation is
Figure BDA0001520254680000031
Wherein the content of the first and second substances,
Figure BDA0001520254680000032
for the flow rate of the ith water supply loop in the design working condition operation, the detuning amount of each water supply loop is delta G ═ delta G1，ΔG2，…，ΔGb]TWherein, in the step (A),
Figure BDA0001520254680000033
the amount of detuning for the ith water supply loop;
in this embodiment, the central air-conditioning chilled water system of the office building has 5 water supply loops, the design flow of each water supply loop is 40t/h, the flow in each water supply loop of the chilled water system is adjusted by a valve on the water separator, and data acquisition is performed on the initial flow of each water supply loop when the water supply loops operate in an actual working condition by using an ultrasonic flowmeter, as shown in table 1.
TABLE 1 initial flow rates for the Water supply circuits
Figure BDA0001520254680000034
Step 2, adjusting the flow of the first water supply loop to the flow G when the design working condition operates* 1Monitoring and recording the flow G 'of each water supply loop under the working condition after the system is stabilized'11、G′12、…、G′1bThe flow rate of each water supply loop is influenced by the first water supply loop to generate a flow rate variable quantity delta G11、ΔG12、…、ΔG1bWherein, Δ G1i＝G′1i-GiThe flow variation generated for the ith water supply loop influenced by the first water supply loop; after the variable quantity of the flow of each water supply loop is recorded, the flow of the first water supply loop is restored to G1；
And 3, sequentially adjusting the flow of other water supply loops to the flow when the water supply loops operate under the designed working condition according to the method in the step 2, monitoring and recording the flow of each water supply loop under the working condition after the system is stabilized, obtaining the flow variation of each water supply loop on other water supply loops due to the flow variation, and further obtaining a flow influence coupling matrix between the water supply loops on the water separator, wherein the flow influence coupling matrix is shown as the following formula:
Figure BDA0001520254680000041
step 4, calculating the flow to be regulated when each water supply loop reaches the design flow according to the flow influence coupling matrix among the water supply loops on the water separator and the detuning amount of each water supply loop, as shown in the following formula:
Figure BDA0001520254680000042
wherein the content of the first and second substances,
Figure BDA0001520254680000043
the flow rate required to be adjusted when the flow rate reaches the design flow rate for the ith water supply loop;
and 5, monitoring the flow rate which needs to be adjusted when each water supply loop reaches the designed flow rate according to the calculation in the step 4 by using an ultrasonic flowmeter, and sequentially adjusting the flow rate of each loop to a transition flow rate G '([ G')1、G″2、…、G″b]TWherein, in the step (A),
Figure BDA0001520254680000044
the transitional flow for the ith water supply loop; and when all the water supply loops of the water separator of the chilled water system are regulated, the chilled water system reaches the balance required by design, and the debugging is finished.
In this embodiment, the flow rate and the imbalance rate of each water supply loop after one round of debugging are shown in table 2. It can be seen that the hydraulic imbalance of each water supply loop is effectively improved, and the flow rate can not completely reach the designed value, but can meet the precision required by the engineering field.
TABLE 2 flow after commissioning of the Water supply circuits
Figure BDA0001520254680000045
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.

Claims (1)

1. A quick adjustment method for hydraulic balance of a chilled water pipe network of a central air conditioner is characterized by comprising the following steps: the method comprises the following steps:
step 1, for a chilled water system with b water supply loops, acquiring initial flow G ═ G of each water supply loop on a water separator when the chilled water system runs under actual working conditions by using an ultrasonic flowmeter1,G2,…,Gb]TWherein G isiThe initial flow of the ith water supply loop is 1, 2 … and b when the ith water supply loop operates under the actual working condition; the flow of each water supply loop when the chilled water system is in design condition operation is
Figure FDA0001520254670000011
Wherein the content of the first and second substances,
Figure FDA0001520254670000012
for the flow of the ith water supply loop in the design working condition operation, the misadjustment amount of each water supply loop is delta G [. DELTA.G ]1,△G2,…,△Gb]TWherein, in the step (A),
Figure FDA0001520254670000013
the amount of detuning for the ith water supply loop;
step 2, adjusting the flow of the first water supply loop to the flow G when the design working condition operates* 1Monitoring and recording the flow G 'of each water supply loop under the working condition after the system is stabilized'11、G′12、…、G′1bThe flow rate of each water supply loop is influenced by the first water supply loop to generate a flow rate variable quantity delta G11、△G12、…、△G1bWherein, Δ G1i＝G′1i-GiThe flow variation generated for the ith water supply loop influenced by the first water supply loop; after the variable quantity of the flow of each water supply loop is recorded, the flow of the first water supply loop is restored to G1；
And 3, sequentially adjusting the flow of other water supply loops to the flow when the water supply loops operate under the designed working condition according to the method in the step 2, monitoring and recording the flow of each water supply loop under the working condition after the system is stabilized, obtaining the flow variation of each water supply loop on other water supply loops due to the flow variation, and further obtaining a flow influence coupling matrix between the water supply loops on the water separator, wherein the flow influence coupling matrix is shown as the following formula:
Figure FDA0001520254670000014
step 4, calculating the flow to be regulated when each water supply loop reaches the design flow according to the flow influence coupling matrix among the water supply loops on the water separator and the detuning amount of each water supply loop, as shown in the following formula:
Figure FDA0001520254670000015
wherein the content of the first and second substances,
Figure FDA0001520254670000016
the flow rate required to be adjusted when the flow rate reaches the design flow rate for the ith water supply loop;
and 5, monitoring the flow rate which needs to be adjusted when each water supply loop reaches the designed flow rate according to the calculation in the step 4 by using an ultrasonic flowmeter, and sequentially adjusting the flow rate of each loop to a transition flow rate G '([ G')1、G″2、…、G″b]TWherein, in the step (A),
Figure FDA0001520254670000017
the transitional flow for the ith water supply loop; and when all the water supply loops of the water separator of the chilled water system are regulated, the chilled water system reaches the balance required by design, and the debugging is finished.
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CN111125938B (en) * 2020-01-15 2021-07-16 华南理工大学 Suboptimal algorithm-based optimization design method for large central air-conditioning chilled water pipe network
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Publication number Priority date Publication date Assignee Title
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CN103383706A (en) * 2012-05-29 2013-11-06 广东工业大学 Construction method of heating ventilation air conditioning hot and cold water pipe network space topological structure
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