How to calculate the energy consumption of air conditioning box fans separately according to operating periods?

The energy consumption of air conditioning box fans should be calculated separately according to actual periods such as production, low load, and standby, and the input power and operating time of the corresponding periods should be used. If the power changes with the speed and resistance, it is not appropriate to multiply the measured power once by the number of hours throughout the year, nor is it appropriate to use the motor nameplate power instead of the actual input.

Put the power and operating mode in the same table

It can record the start and end time of each segment, average or integrated power, air volume status and filter pressure difference. If the meter directly outputs the accumulated electricity, use the interval difference to check; if the calculation is based on trends, the sampling interval and missing data should be explained. When multiple fans share an electric meter, it is also necessary to confirm whether the electricity used by other equipment is mixed.

The time dimension should write the actual operating hours and switching records of each mode; the power dimension should write the actual input power or electricity under the same measurement boundary; the working condition dimension should write the speed, air volume, resistance and filter material status. The three items correspond to different statistical conditions, and you cannot give only one total power. Why can’t the annual energy consumption of air-conditioning boxes be estimated only based on rated power? Please refer toWhy can’t the annual energy consumption of air conditioning boxes be estimated based on rated power alone?。

The operating period should be divided according to actual status

The operating status of the fan may be different during production period, low load period, duty period and shutdown pressure maintenance period. The air volume may be high during production periods, the frequency may be reduced during low load periods, the minimum air volume may be maintained during duty periods, and the fans may operate intermittently during shutdown and pressure maintenance periods. The input power and operating time of each period should be recorded separately.

Changes in the proportion of new return air will affect the fan load, please refer toHow is the proportion of new return air to the air-conditioning box determined by project requirements? . For the impact of night duty air supply costs, please refer toWhat impact do chemical filters have on the cost of night duty air supply?。

Power data should come from actual operating points

The actual input power of the fan varies with the operating point, rotation speed and filter resistance. The nameplate power is the motor rating and is not equal to the actual consumption during operation. The input power should be measured under stable operating conditions, or verified by accumulating power on an electric meter. The power of variable frequency fans changes greatly at different speeds and cannot be linearly converted according to the rated power.

How to check the fan efficiency range, please refer toWhy should we check the efficiency range when selecting air-conditioning box fans? . For the driving conditions of DC fans, please refer toWhat driving conditions need to be matched when using a DC fan in an air-conditioning box? . For comparison between backward-inclined and forward-inclined fans, please refer toHow do the backward-inclined and forward-inclined fans compare when used in air conditioning boxes?。

Changes in filter resistance should be included in statistics

After the filter accumulates dust, the resistance increases, and the fan needs to increase the speed or increase the input power to maintain the air volume. If annual statistics are calculated based only on the initial resistance of new filter materials, the actual consumption may be underestimated. The range of change between initial resistance and final resistance should be included in period-by-period statistics.

How to configure filter classification, please refer toHow to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages? . What functional segments does internal resistance include? Please refer toWhat functional segments should be included in the internal resistance of the air conditioning box? . How to establish the fan pressure budget, please refer toHow is the total pressure of the air conditioning box fan determined by the internal resistance and external demand?。

Apportionment is required when multiple fans share an electric meter.

When multiple wind turbines share one electricity meter, the allocation method needs to be clearly defined. It can be allocated based on operating time, rated power ratio or measured power ratio, but the assumptions should be stated. If there is an independent electricity meter, the independent metering data will be used first. It should also be indicated whether the electricity used by auxiliary equipment such as control cabinets, actuators and sensors is included.

What equipment should be included in the air conditioning box energy consumption assessment? Please refer toWhat equipment electricity consumption should be included in the energy consumption assessment of air-conditioning boxes? . Multiple devices can be linked together to understandFFU computer group control system .Supporting method of

How to use statistical results to compare before and after optimization

For example, first compare the electricity per unit time under the same production shift and air volume requirements, and then evaluate whether the mode allocation has changed. If production time is reduced after optimization, changes in operating time should be distinguished from changes in equipment efficiency. Low rotational speed may not necessarily directly estimate annual energy savings based on the ideal cubic relationship. Actual control and system conditions require data support.

How to change the debugging sequence from stand-alone to system linkage, please refer toHow to change the debugging sequence of air conditioning box from stand-alone unit to system linkage? . For condition checks before starting the machine for the first time, please refer toWhat conditions need to be checked before the air conditioner is turned on for the first time? . Statistical records should be able to correspond to the equipment number, date and operating mode.

Aili industrial supporting equipment

Aili Industrial can coordinate and check the fan control and equipment side data, and the project party will keep time-sharing power and working condition records, making it easier to evaluate the transformation effect. Aili's industrial manufacturing end covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. The fan operating status, control interface and metering loop can be corresponded in the same set of supporting materials; non-standard configurations can retain time-sharing metering points and operation records.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andEFU equipment end fan filter unit verification; multiple equipment linkage can understandMatching method of FFU computer group control system ; terminal particle filtering can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. Specific energy consumption data, measurement methods and delivery scope still need to be verified based on corresponding configuration data and on-site working conditions. The actual effect is subject to on-site measurement and performance test results.

Submit project parameters:https://ailigy.com/contactus.html

Related questions and answers

Can the energy consumption of a fan be estimated by multiplying the rated power by the number of operating hours?
Not recommended. The actual input power changes with the working conditions, rotation speed and resistance, and should be calculated separately according to the operating period.

If multiple wind turbines share one electric meter, how should they be apportioned?
It can be allocated according to operating time, rated power proportion or measured power proportion, but the assumptions should be stated, and independent data should be used first when there is an independent electricity meter.

Can Aili Industrial help check fan energy consumption statistics?
The time-sharing statistical method can be checked in combination with the fan control configuration and metering loop. The specific data needs to be confirmed based on on-site metering and operation records.

Related articles

1. Why can’t the annual energy consumption of air conditioning boxes be estimated based on rated power alone?

2. What equipment electricity consumption should be included in the energy consumption assessment of air-conditioning boxes?

3. Why should we check the efficiency range when selecting air-conditioning box fans?

4. What functional segments should be included in the internal resistance of the air conditioning box?

Key points for selection and acceptance inspection