Thermal retention technology in vacuum flask and how to choose the good heat keeping bottle
People want to keep water in vacuum flask hot for a long time, about a whole day or half a day to serve enough hot water for a certain number of people. Therefore, manufacturers want to apply good thermal retention technology to satisfy this demand. They tried to design the long heat keeping bottle by reducing 3 heat loss ways including convection, conduction and radiation. We will go ahead to learn more about this issue.
Heat loss mechanism in nature
In nature, a body can also gain or lose heat through mechanisms of heat exchange: convection, conduction and radiation. Conduction transfers heat from one object to another through physical contact. Convection transfers heat to air or water. Radiation transfers heat via infrared radiation.
Thermal transfer appears in nature
Generally, we can easily find that a cup of hot water become cooler after a short time of standing still. It releases heat mainly via convection, heat exchange with ambient. If we cover the cup with a closed lid, the heat reduction is more slowly because we prevent the convection.
In another case with solid object, if we touch the hot metal surface in a certain time, our hand also raises it temperature. This is called heat conduction through physical contact directly.
And when we near a flame with no touch, we can feel the heat and our body will increase after a certain time. This is called thermal radiation. A better example that we face daily, sun transfer heat to our earth via sun light radiation. The daily temperature is higher than the evening one, and the heat on equator is always higher than the two poles because the sun radiation in the equator much more than the other regions.
Thermal retention technology in vacuum flask
Vacuum flask is one of the method that human want to keep food and beverage hot longer, especially in winter. Heat loss in vacuum flask also appears in three ways: conduction, convection and radiation. In order to keep hot, we must restrain the heat loss via these heat transfer ways.
Manufacturers use closed lids to cover mouth of vacuum flask to reduce thermal convection. They plate silver layer on the surface of glass bottles to increase the heat radiation inside the glass bottles to decrease the heat loss to outwards. And they design a vacuum flask with thermal isolated case like plastic to restrain heat conduction.
Thermal transfer appears in vacuum flask
Any vacuum flask which satisfies these heat retention technology is surely the high quality item. And such flask can keep hot for about 10-12 hours, 6-8oC reducing after that time.
Recommended vacuum flask with good thermal retention technology
Among various water bottles in the market, we can choose the good one if we learn by heart these tips as below.
The vacuum flask made by prestige manufacturers. These producers surely own the good thermal retention technology to make the high quality vacuum flask with long-time heat keeping. We may care about Thermos, Tiger, Rang Dong, Hydro Flask, Stanley, etc.
Recommended thermal retention travel flask for camping
Suggested item in Rang Dong’s collection with best thermal retention technology
The declared specification on product label should show that the heat keeping time may vary from 8 hours to 12 hours. And the temperature left after such time may 6-8oC lose.
We should try to twist the lid to see how closed it can attach to the flask body if we care the travel bottle. For the tea pot, coffee pot, air pot or big size vacuum flask with spout to take out of water, we may try the operation of the spout. It should drain water firmly with an enough small flux.
A good thermal retention technology applied in double walled insulated air pot
And finally, of course we should care the warranty time of the manufactures. A good warranty service enables us to return the products with any damage within 6 months to 12 months commencing purchase date.
We hope the above sharing can help you to study more the thermal retention technology in water bottle and then you can buy the good item for your right purpose.
Should you have any questions or request a quotation of Rang Dong products, please send us an email to: export@rangdong.com.vn.
Websites: en.rangdong.com.vn and vacuumflask.rangdong.com.vn.
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