阅读说明：本技术 调控至少两个风扇的方法 (Method for regulating at least two fans ) 是由 A·费塞尔 S·施瓦布 W·埃伯勒 于 2018-07-12 设计创作，主要内容包括：本发明涉及用于调控包括一定数目的至少两个风扇(1)和/或风扇组的系统的调控装置和方法，用于生成定义的额定值V<Sub>G,Soll</Sub>和Δp<Sub>G,Soll</Sub>，其中，根据哪个额定值预设为固定，更改至少一个风扇(1)的运行点，使得其中至少一个风扇(1)处于最优运行点，从而提高系统效率η<Sub>G</Sub>。(The invention relates to a control device and a method for controlling a system comprising a number of at least two fans (1) and/or fan groups for generating a defined setpoint value V G,Soll And Δ p G,Soll Wherein the operating point of the at least one fan (1) is modified, depending on which setpoint value is predetermined as fixed, such that the at least one fan (1) is at an optimal operating point, thereby increasing the system efficiency η G 。)

1. Method for regulating a system comprising at least two fans (1) and/or fan groups of number n, for generatingIn which system the pressure increase Δ p is variable_G,SollDefined volume flow V_G,SollIs defined by a nominal value (V)_G,Soll，Δp_G,Soll) Or vice versa, comprising the steps of:

a) determining the operating state (1) of the fan;

b) determining the energy optimization potential of each fan (1);

c) comparing the operating conditions determined in step a) with the respective optimized operating conditions of the fans in step b) in order to obtain an optimization recommendation about the fan (1); and

d) correcting variable nominal values (V)_G,Soll，Δp_G,Soll) Wherein the efficiency η of the system is increased by changing the operating point of at least one fan (1) depending on which nominal value is preset as fixed, such that at least one of the fans (1) is at an energy-optimized or optimal operating point_G，

Wherein, in step a), determining the operating state of the fan (1) is performed as follows: at least the volume flow V and the rotational speed n of the individual fan (1) are determined, and the pressure increase Δ p of the fan (1) is determined as a function of the volume flow and the rotational speed_stPower consumption P and efficiency η_GPreferably they are kept in the engine electronics of several fans (1), and wherein

In step c) an optimization proposal for adjusting the operating state is determined, taking into account which fan (1) has the greatest power contribution to the ventilation of the system.

2. The method according to claim 1, characterized in that step d) is carried out as follows: a plurality of one or more fan groups or all fans (1) are brought to an energy-optimized or optimum operating point relative to an uncorrected operating point.

3. Method according to claim 1 or 2, characterized in that for defining the nominal value (V)_G,Soll，Δp_G,Soll) Lower increase in system efficiency η_GAnd one or more fans (1) are turned off.

4. Method according to claim 1, characterized in that the pressure increase Δ p of each fan (1)_stAnd the power consumption P is determined by its volume flow V and its rotational speed n.

5. Method according to any of the preceding claims, wherein for determining the optimization potential in step b) an optimized volume flow rate V is determined_optAnd optimized pressure increase Δ p_opt。

6. Method according to any of the preceding claims, wherein optimization suggestions are made in the form of adjusting the current operating state of one or more fans (1) based on comparing the operating states from step a) and step b), wherein

a. Defined as maintaining a constant volume flow V_G,SollIs based on an optimized pressure increase Δ p_optWhether greater or less than a determined pressure increase Δ p_stTo increase or decrease the pressure, or

b. Defined as maintaining a constant pressure p_G,SollIs based on an optimized volume flow V_optWhether it is greater or less than the determined volume flow V to increase or decrease the volume flow.

7. The method according to any of the preceding claims, wherein the power consumption P of each fan (1) is detected before and after the correction in step d) and it is determined whether the sum of all power consumption P of the fans (1) is reduced in response to the optimization step compared to the sum of all power consumption P determined previously.

8. The method according to claim 7, wherein if after the optimization step the sum of all power consumptions P is not reduced, then returning to the previously performed optimization step to make the adjustment.

9. Method according to claims 6 to 8, wherein the measures according to claims 6 to 8 are repeated periodically until a defined total efficiency or a correspondingly optimized total efficiency in the last cycle is reached, wherein these measures are terminated at the latest after a defined number of cycles.

10. A conditioning device (1) for performing the method according to any one of claims 1 to 9, wherein the conditioning device comprises:

a. the detection mechanism is used for measuring the volume flow of the single fan and all the fans;

b. determining an energy optimization potential V of each fan (1)_optAnd Δ p_st,optWherein the rotational speed n reaches a constant speed;

c. a comparator for comparing the determined operating state with the optimized operating state to obtain a specific optimization recommendation therefrom;

d. means for adjusting the variable ratings to increase the efficiency η of the system by changing the operating state of at least one fan (1) depending on which rating in the system is preset to be fixed so that at least one of the fans (1) is at an energy optimized or optimal operating point_G。

Technical Field

The invention relates to a control method for operating at least two or more fans in an energy-optimized or efficiency-optimized manner in order to generate specific operating states in a ventilation system.

Background

Using multiple fans or a fan group with several individual fans, generating a defined volume flow at a variable pressure increase or a defined pressure at a variable volume flow, which can be done under different operating conditions of the fans involved, all with different total energy requirements and therefore also different overall efficiencies.

When multiple fans or fan assemblies or combinations thereof are employed, in practice, it may be problematic to use these fans or fan assemblies in accordance with the ventilation task so that the system as a whole operates at an optimum or optimal overall energy demand or overall efficiency.

There is thus a need for a control method for a number of at least two fans which are controlled as a system relative to one another, i.e. a preset setpoint value (volume flow dV/dt, hereinafter referred to as V for short, or pressure increase Δ p) for at least one fan of the number of fans_sys) The overall energy requirements and overall efficiency of the system are optimized.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a control method and a control device for a plurality of fans and/or fan groups, by means of which energy optimization and efficiency improvement of the overall system can be achieved without additional constructional measures being required for the individual fans.

The solution of the invention to achieve the object is the combination of features according to claim 1 and according to claim 10.

The basic idea of the invention is that the concept of a control device and a control method for a plurality of fans is based on the fact that all fans of the system know their operating state and their respective energy optimization potential. On the basis of this, a regulating device regulates the air quantity distributed to the individual fans or the pressure supply in the system, so that the operation of the individual fans and the entire system is achieved with optimum efficiency.

Thus, according to the present invention there is provided a method for regulating the number n toMethod for a system with two fans and/or fan groups in which a defined nominal value for a defined volume flow is generated at a variable pressure increase or vice versa at variable volume flow and a fixed pressure increase, comprising the steps in which the pressure or pressure increase is a static pressure increase Δ p_st：

a) Determining the running state of the fan;

b) determining the energy optimization potential of each fan (preferably also saving optimization data);

c) comparing the operating state determined in step a) above with the respective optimized operating state of the fans in step b) in order to derive therefrom an optimization recommendation regarding the (at least one) fan; and

d) correcting for variable ratings (volume flow or boost) by altering the operating point or current operating state of at least one fan based on which preset rating is fixed and which rating is variable to bring at least one of the fans to an energy optimized or optimal operating point to increase the efficiency η of the system_G. In this case, the individual regulation of the fixed setpoint values remains unchanged.

In the sense of the present invention, an "energy-optimized state" refers to a state in which the fan has better efficiency after its operating state has been adjusted than before the adjustment, while the entire system is in an "energy-optimized state" in which the sum of the power consumptions of all fans is lower after the optimal adjustment than before the adjustment.

In this way, with the energy optimization potential determined in step b) above, it is possible to bring the specific operating state of a particular fan into an energy optimized state. For this purpose, these operating data can be used in the control method to switch the relevant fan to a specific operating condition.

Advantageously, step d) is carried out as follows: a majority of one or more fan sets or all fans are brought to an energy optimized or optimal operating point relative to an uncorrected operating point.

For this reason, it may be more advantageous to increase the system efficiency η at a defined fixed rating (volume flow or pressure increase)_GOfIn the method, one or more fans are completely shut off.

According to the invention, in step a) above, the determination of the operating state of the fan is carried out as follows: at least the volume flow V and the rotational speed n of the individual fans are determined and the pressure increase Δ p of the fans is determined or determined from the volume flow and the rotational speed_stPower consumption P and efficiency η_GThey are preferably kept in the engine electronics of several fans.

In this case, the pressure increase Δ p of each fan_stAnd the power consumption P is preferably determined by its volume flow V and its rotational speed n. Overall, the variable pressure increase Δ p is determined as a function f (V, n) f_stPower consumption P and efficiency η_GAnd can be used for the regulation and control method.

The method according to the invention is further preferably designed such that, for determining the optimization potential in step b) described above, an optimized volume flow V is determined_optAnd optimized pressure increase Δ p_opt。

More advantageously, the optimization proposal is made in the form of an adjustment of the current operating state of the fan or fans, based on a comparison of the operating states from step a) and step b), wherein,

defined as maintaining a constant volume flow V_G,SollIs based on an optimized pressure increase Δ p_optWhether greater or less than a determined pressure increase Δ p_stTo increase or decrease the pressure, or

Pressure Δ p defined as being kept constant_G,SollIs based on an optimized volume flow V_optWhether it is greater or less than the determined volume flow V to increase or decrease the volume flow.

In determining the optimization proposal, to adjust the operating state in step c), it should be considered which fan or fan group contributes most to the power ventilated by the system, wherein the power consumption P of each fan is determined before and after the correction in step d), respectively, and it is determined whether the sum of the total power consumption P of the fans decreases in response to the optimization step compared to the previously determined sum of the total power consumption P.

If the sum of the total power consumption P is not reduced after the optimization step, it is adjusted back to the previously performed optimization step.

These adjustment measures are repeated periodically until a defined total efficiency or a correspondingly optimized total efficiency in the last cycle is reached or the total efficiency is asymptotically approached, wherein the measures are terminated after a defined number of cycles or at a defined operating point.

Another aspect of the invention relates to a conditioning device for performing the above method, wherein the conditioning device comprises:

-detection means for determining the volumetric flow and the rotational speed n of at least a single fan and all fans;

-determining the energy optimization potential, such as V, of each fan_opt＝f(n)、Δp_ST,optConstant speed (speed n) can be achieved;

-a comparator for comparing the determined operating state with the optimized operating state in order to derive therefrom a specific optimization recommendation;

means for adjusting the variable nominal values (volume flow or pressure increase) to increase the efficiency η of the system by modifying the operating state of at least one of the fans depending on which nominal value in the system is preset as fixed, so that at least one of the fans is in an energy-optimized or optimal operating state_G。

In practice there are many different possibilities to design and develop the teachings of the invention advantageously. To this end, preferred embodiments of the invention are set forth in the dependent claims with reference to claim 1 and in the following with reference to the accompanying drawings. In connection with the description of the preferred embodiments of the invention with reference to the drawings, there is also set forth preferred embodiments and modifications of the present teachings in general.

Drawings

In the figure:

FIG. 1 illustrates a graph of power consumption P of an exemplary fan versus volumetric flow V and rotational speed n;

FIG. 2 illustrates an exemplary fan pressure increase Δ p_stGraph of (static pressure) versus volume flow V and rotational speed n;

FIG. 3 illustrates an exemplary fan efficiency η_stA graph relating volume flow V to rotational speed n;

FIG. 4 shows a graph of the optimum volumetric flow rate of the fan as a function of the rotational speed;

FIG. 5 shows the optimum static pressure Δ p of the fan_optA plot of variation with rotational speed;

FIG. 6 illustrates the optimal efficiency η of the fan_optA plot of variation with rotational speed;

FIG. 7 shows a comparison of two conditions of a fan at constant volumetric flow rate in a system in which static pressure is reduced to increase the supply pressure Δ p of the fan_stThereby improving the efficiency;

FIG. 8 shows a schematic diagram of a non-central fan system with a fan as the volumetric flow regulator;

FIG. 9 illustrates an example of variable pressure;

FIG. 10 shows three graphs of an embodiment of six fans connected in parallel in a fan net, but with different numbers of fans activated respectively; and

fig. 11 shows an example of a variable volume flow.

In the drawings, like reference numerals refer to like structural and/or functional features.

Detailed Description

The operating state is determined according to an embodiment of the method of the invention with reference to fig. 1 to 3. For this purpose, corresponding graphs are shown in fig. 1 to 3, in which the power consumption P or the voltage increase Δ P is represented_st(static pressure) and efficiency η_stAnd the relationship between the flow V and the speed n of an exemplary fan in the fan set. These variables n, V, P, Δ P_stAnd η_stRepresents a measurable operating state or a relevant value used in the regulation method.

Fig. 4 to 6 illustrate how the volume flow V is achieved_optAnd pressure increase Δ p_optAnd corresponding associated efficiency η_optWherein the measured rotational speed reaches a constant speed. FIG. 4 shows for this purpose m³Volume flow V in h_optIn a fan speed n, wherein the speed n is in the range of 0 to about 3200 revolutions per minute.

FIG. 5 shows static pressure Δ p_optFig. 6 shows efficiency η in% as a function of fan speed n_optIs plotted as a function of the fan speed n.

FIG. 7 shows a comparison of two conditions of a fan at constant volumetric flow rate in a system in which static pressure is reduced to increase the supply pressure Δ p of the fan_stThereby improving efficiency as shown in the right diagram.

A schematic of a non-central fan system with a fan as the volumetric flow regulator is shown in fig. 8. It is a ventilation system consisting of a central ventilation unit 10, comprising an air filter 11, a fan 1, two heating registers 13 and a cooling register 14 located therebetween, which are connected to a damper 16 via an air duct 15. The air duct 15 leads from the damper 16 to two air branch ducts 15a, 15b, in each of which a fan 1 with a damper 16 and an air-permeable mechanism 17 are arranged. Furthermore, a collector Δ p is provided_sys. The fan 1 is connected to the detection means 19 using control technology, wherein the system is configured as an exemplary volumetric flow control system, wherein the volumetric flow through the non-central fan 1 is variably controlled by the method in order to control the pressure in the system.

By means of the central ventilation unit 10, the system pressure of the non-central fans 1 can be adjusted according to optimization recommendations. This means that:

-Δp_st<Δp_opt: the central ventilation unit 10 will lower the collector Δ p_sysSo that a single fan 1 has to overcome a greater pressure, or

-Δp_st>Δp_opt: the central ventilation unit 10 increases the collector Δ p_sysThereby relieving the load of the individual fans 1 and generating less stress.

In a further embodiment, not shown, for example 6 fans are combined in a fan network when operated in parallel for applications with variable volume flow.

If the volume flow V is optimal on the left, i.e. the condition V < V_optPredominantly, this can be achieved by switching off the fan 1 concernedAnd (6) optimizing. In fig. 8, from top to bottom, the case is shown where first 6 fans 1 in the fan network are operated, then only 5 fans 1 are operated, and thereafter only 4 fans 1 are operated, and then the other fans 1 are turned off.

In the sense of the optimization proposal, the fans 1 remaining in the fan network each have to deliver more volume at the same system pressure (500 Pa in this case), but overall the optimum operating conditions are reached to establish a higher efficiency in the system.

At the operating point, the individual fans are all at 10000m at 500Pa³The volume flow V/h reaches the optimum operating state. In the case of parallel operation of 6, 5 or 4 fans, the operating point can reach 40000m at 500Pa³Volume flow V/h. The results are the following data:

total efficiency η based on static pressure increase of 6 fans_st56%, power 100% (P9846W);

total efficiency η based on static pressure increase of 5 active fans_st59%, power reduction-5% (P9374W); and

total efficiency η based on static pressure increase of 4 active fans_stPower is reduced by-10% (P8988W) at 62%.

In fig. 9 and 11 is shown the volume flow V in an example of a variable pressure or a variable volume flow at constant pressure for 6 or 4 fans respectively at constant volume flow_sysAnd pressure Δ p_sysThe relationship between them.

This solution represents an exemplary embodiment of the present invention in which the regulation method for the fans is based on the fact that the multiple fans in the fan network know their operating status and their respective energy optimization potential, on this basis, the air volume is distributed to each fan at a system pressure that remains constant, so that only four fans operating can produce η_st62% optimum efficiency.

＊＊＊＊＊