Hioki Power and Data Logger For HVAC Power Consumption Saving
♦ What is HVAC?
Figure 1.0 Air Conditioning System Components And Cycle
HVAC stands for Heating, Ventilation, and Air Conditioning system. It provides heating or cooling and ventilation services to residential and commercial buildings  for thermal control and comfort. This system applies the principles of thermodynamics, fluid mechanics, and heat transfer for its functionality. The HVAC system consumes power to enable the heat transfer process to take effect. This article focuses on the air conditioning system in particular.
Figure 2.0 Air Conditioning Impact On The Environment
♦ Air Conditioning System And Its Impact
A few factors are known to affect the power consumption of the air conditioner as follow :
1. Indoor air temperature
2. Outdoor air temperature
3. Thermal insulation of room
4. Air conditioner temperature setting
As there’s little or no control over the first three factors above, only the air conditioner temperature setting can help in power consumption saving. Hioki’s Clamp On Power Logger PW3360-21 is used to record the power consumption of a ceiling cassette air conditioner by different temperature settings and subsequently calculate the cost of electricity usage. At the same time, Hioki’s Wireless Voltage/Temp Logger LR8515 records the concurrent temperature readings during each setting period. The temperature settings are evaluated at the same location and period of the day over different days.
Figure 3.0 and Figure 4.0 show the integrated active power, and cumulative energy cost respectively on an hourly basis. The temperature setting of 22°C gives a consistent lower power consumption and cost compared to other temperature settings*.
Figure 3.0 Integrated Active Power By Time
Figure 4.0 Cumulative Energy Cost By Time Air Conditioner Power Consumption Saving
Figure 5.0 Temperature Data Log For Different Air Conditioner Temperature Setting
The temperature logging data (Figure 5.0) shows a steady temperature trend with low hour-to-hour fluctuations for the 22°C setting.
Figure 6.0 Estimated Annual Energy Consumption And Cost By Temperature Setting
Using this data, the estimated annual energy consumption and cost (Figure 6.0) is the lowest at the setting of 22°C*. This is a staggering 42% lower than the 20°C setting and 65% lower than the 24°C setting. The significant impact on energy cost shows the importance of finding the optimum temperature setting of an air conditioning system. Hence, Hioki’s Clamp On Power Logger PW3360-21 is a highly beneficial tool to determine the best temperature setting for the power consumption saving of a HVAC system.
Other than HVAC power consumption saving, the following can also be done at manufacturing facilities for energy saving efforts :
1. Lighting usage – Switch off lights when not in use or install an automated lighting system based on room occupancy or daylight availability
2. Turn off and run equipment only on-demand – Air compressor, in particular, can use up to 20% of power usage  which have significant cost impact
3. Shade windows – This reduces heat from the direct sun from entering the building and thus reducing the air-conditioning requirements
4. Replace existing lights with LED – LED lights, especially ENERGY Star rated products, use 75% less energy and last 25 times longer than incandescent lighting 
In summary, energy consumption saving helps energy cost reduction and reduces the global warming effect. HVAC best setting for maximum power consumption saving can be easily determined using Hioki’s Clamp On Power Logger PW3360-21 and Wireless Voltage/Temp Logger LR8515 for temperature monitoring.
♦ Also Available
Clamp on Power Logger PW3365: World’s first non-metallic contact power meter and energy logger
♦ Advanced Energy Analysis
For more advanced surveys of power quality, we recommend the HIOKI PQ3198 or the PQ3100.
*Disclaimer: The concluded 22°C temperature setting is based solely on our study of a ceiling cassette air conditioner and one compressor type in a commercial office. Readers should not misconstrue this value to represent the universal best temperature setting for air conditioner energy cost-saving purposes. The temperature ranges of 22°C to 25°C are known to give both comfort and cost-saving  . Kindly approach our sales representatives for more information on studying the power consumption at your facility using Hioki’s power logger and data logger.
♦ Download Product Catalogs Here
♦ For Full Application Note, Please Fill In Your Details Below and Check Your Mailbox