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

When evaluating the energy consumption of air-conditioning boxes, the statistical boundaries should first be defined, at least distinguishing between direct electricity consumption by the unit and external energy sources such as cold water and hot water. Fans, electric heating, electric humidification and control accessories may belong to the unit's electricity consumption; cold stations, pumps and external heat sources need to have separate calibers and cannot be mixed into an unspecified range of numbers.

Create an inventory by how energy enters your device

Mark the meter or metering location for each component and identify if it shares a circuit with other equipment. The heat change of the water coil can be calculated based on the flow rate and temperature difference, but it is not the actual power consumption of the cooling station, and the two cannot be directly equated. When comparing two configurations, verify that heating, humidification, and external cooling and heating sources are all within the same boundaries.

Direct electricity consumption includes fans, drives, electric heating, electric humidification and actual accessories; cooling and heating consumption includes energy input from the water side or other cooling and heat carrying media; shared energy includes shared cold stations, pumps, etc. calculated according to the agreed method. The three types of energy enter the equipment in different ways, and the statistical calibers should also be separated. How to calculate fan power consumption by time period, please refer toHow to calculate the energy consumption of air conditioning box fans separately according to operating periods?。

Don’t just look at the nameplate power when using a fan.

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. To evaluate the power consumption of the fan, the power data under actual air volume should be used, or the accumulated power of the electric meter should be used to check. Check the efficiency range when selecting a fan, please refer toWhy should we check the efficiency range when selecting air-conditioning box fans? ;Why the annual energy consumption cannot be estimated only based on the rated power? Please refer toWhy can’t the annual energy consumption of air conditioning boxes be estimated based on rated power only?。

The regulation characteristics of DC fans under partial load are different from those of AC fans. The input conditions of electric heating and electric humidification will also affect the total electricity consumption. If the unit has both electric heating and hot water coils, they should be measured separately to avoid comparing different energy sources together. 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?。

Electric heating and electric humidification should be listed separately

Electric heating and electric humidification belong to the direct use of electricity by the unit, with large power and input according to the working conditions. The evaluation should record the enablement period, control method and actual inputs rather than the rated power multiplied by the number of hours throughout the year. Preheating, heating and reheating have different tasks and input conditions. Please refer toWhat problems do air conditioning box preheating, heating and reheating solve respectively? . How to choose between hot water heating and electric heating, please refer toHow to choose between hot water heating and electric heating for air conditioning boxes?。

Humidification methods also affect electricity consumption. The energy consumption and maintenance methods of electrode type and electric heating humidifiers are different. Please refer toWhat is the difference between electrode type and electric heating humidifiers used in air conditioning boxes? . If humidification is provided by an external steam source, it is an external energy source and should be counted separately from electric humidification.

Control accessories and auxiliary equipment should also be included

The power consumption of control cabinets, actuators, sensors and communication modules is usually small, but should not be completely ignored in a refined assessment. When multiple units share a control cabinet, the allocation method needs to be clearly defined. If the unit is equipped with a frequency converter, electric heating or other auxiliary equipment, it should also be noted in the list.

It is easy to miss the metering of auxiliary equipment, especially components scattered in different distribution circuits. Before the assessment, the power distribution system diagram should be checked to confirm the purpose and ownership of each circuit.

How to make energy saving comparisons explainable

First ensure that the operating tasks, weather and usage periods are comparable, and then explain the measurement accuracy, missing data and allocation assumptions. If only the fan circuit is measured, the conclusion should be limited to the change in power consumption of the fan and should not be expanded to the energy saving rate of the entire clean system. Unconditional energy saving percentages should not be given without a baseline and continuous recording.

When energy-saving renovation involves both filtration and air conditioning, the boundaries must be clearly stated. Please refer toCan the chemical filter modification be done together with the energy-saving modification of the air conditioning box? andWhy can’t the annual energy consumption of air conditioning boxes be estimated based on rated power only? . When comparing options, equipment investment, input power, maintenance and replacement costs should be placed within the same service level.

Aili industrial supporting equipment

Aili Industrial can provide equipment-side verification data around wind turbines and control configurations; the project side first clarifies the measurement boundaries, which helps compare solutions to verifiable data. 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 power circuits of fans, electric heating, electric humidification and control accessories can be corresponded in the same set of supporting materials, which facilitates project measurement by circuit.

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 understandSupporting method of FFU computer group control system ; when it comes to gaseous pollution control, we can communicate separatelyChemical filter solutions; terminal particle filtration can be combined withHEPA/ULPA filter confirmed. 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 assessment of air-conditioning boxes only include the power consumption of the fans?
It can be used as a special assessment of the wind turbine, but the conclusion should be limited to the scope of the wind turbine. If you want to look at the energy consumption of the entire machine, you also need to include electric heating, electric humidification, control accessories and external cold and heat sources.

Can the cooling capacity of the cold water coil be directly used as electricity consumption?
cannot. Cooling capacity is the water side energy input. The actual power consumption of the cooling station also depends on the unit efficiency, pump consumption and operating conditions. The two need to be calculated separately or allocated according to an agreed method.

Can Aili Industrial help sort out the boundaries of energy consumption measurement?
The power consumption items on the equipment side can be sorted out based on the unit configuration and power distribution circuit. The specific measurement plan needs to be confirmed based on project conditions and on-site power distribution.

Related articles

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

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

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

4. Can the chemical filter modification be done together with the energy-saving modification of the air conditioning box?

Key points for selection and acceptance inspection