Energy saving effect of VIG in refrigeration products

Refrigeration products is high energy consumption products,the energy used account for about 70% of total supermarket energy.In US,the food that require low temperature storage account 90% of total foods,to save the energy consumption of refrigerated display cases,beverage coolers is quite important.

Refrigerators using traditional insulated glass has high energy consumption

The refrigerated display cases usually use electrical heated glass doors or dual low-E triple glass units,with average U value between 1.3-2.8W/M2.K.Polyurethane panels are used around the glass door with U value 0.022-0.033W/M2.K,and thickness 50-70mm.So the transparent glass door is the weakest point of refrigerators ,outdoor heat transmit the glass and cause high working load of compressor,while vacuum insulating glass is new generation energy saving glass product can help decreasing the energy consumption of refrigerators.

Features of vacuum glass

Vacuum glass is insulated panels with vacuum space between glass panels,the vacuum isolate the transmittance of air convection and the sound,and the low-E coating decreased radiation transfer,so vacuum glass U value can reach 0.4-0.6W/M2.K.
The U value of the glass that are typically used in refrigeration products are listed in below tables:

As all refrigerators are used indoor,the energy transmitted the glass don’t include the solar direct transmittance,so U value is the most important factor that affect energy consumption.
Compared with normal 4-12-4 IGU, VIG U value is just 25% ,which means that VIG can save up to 75% energy.

Vacuum insulating glass now has high light transmittance and can help saving energy when applied in refrigerators

Tests about refrigeration products.

The tested refrigerator is SRL-CD2075 from Sanyo cold chain Co.,Ltd, size 608*849*1900mm,net 285L.The tests include 3 different kind glass -Normal IGU+ heating film (U=2.69) , dual low-E triple glass unit (U=1.23) and VIG (U=0.6).
The test will design different indoor temperature and environment temperature and record the energy consumption in 24 hours.
Below table shows the test results under condition that indoor temperature -16 ~-25℃:

Below table shows the test results under condition that indoor temperature -25 ~ -35℃:

Here are the conclusion:
1.When indoor temperature is -16 ~-25℃，compared with dual low-E triple glass units,VIG can save 660KW.h,and around 1000kw.h compared with normal insulated glass.
2.The lower temperature and bigger temperature difference between indoor and outdoor,the more obvious energy saving effect.

Test on compressor

Another test was conducted to test the VIG positive effect on compressors,and below table shows result:

VIG can save about 10% compressor working time and prolong refrigerator lifetime.

Conclusion

vacuum insulating glass is your great choice offering the best energy saving products

1.VIG can save the heat film used in refrigeration products, 1-2Kw.h/ 24h.
2.VIG can avoid the heat emerged by the heat film.
3.VIG can save about 17% total energy consumption compared with other glass products.
4.VIG can decrease the compressor working time and prolong refrigerator lifetime.
HaanGlas is your turnkey vacuum insulating glass manufacturer and supplier,kindly contact us if you want to use VIG in your next grneration energy saving refrigerators.