Is the heat preservation and cold preservation time of the stainless steel vacuum flask the same?

The editor has popularized the common sense that stainless steel vacuum flasks can keep both heat and cold for a long time, but in recent days, I have received many domestic and foreign friends who are puzzled about the ability of stainless steel vacuum flasks to keep cold.Here, the editor reiterated that the vacuum flask not only keeps high temperature, but also keeps low temperature.

The principle of heat preservation is completed by the double-layer vacuum structure of the water cup.The interlayer space between the outer shell of the stainless steel vacuum flask and the inner container forms a vacuum state, which plays the role of unable to conduct temperature, so the barrier is not only heat but also cold.

On the market, the packaging of some brands of thermos cups will clearly indicate the duration of heat preservation and the duration of cold preservation.Some water cups keep the heat and cold for the same length of time, but there are also many differences.Then some friends will ask, since they are all heat preservation, why is there a difference between heat preservation and cold preservation? Why can't the duration of heat preservation and cold preservation be the same?

Generally, the heat retention time of a vacuum flask is lower than the cold retention time, but there are also the oppositeThis is mainly caused by the difference between the heat decay time of the hot water and the increase time of the heat absorption of the cold water, and it is also determined by the workmanship quality of the vacuuming process of the stainless steel water cup.

The editor has made some attempts, but it cannot be used as a scientific statistical basis. Perhaps there are some accidental factors, and there may also be some coincidences.If there are friends who have done thorough statistics and data analysis, welcome to give more confirmed correct answers.

In the test done by the editor, if we set a standard value A for the vacuum in the stainless steel double-layer water cup, it is lower than the vacuum value of A, and the heat preservation effect is worse than the cold preservation effect, and it is higher than the vacuum value of A The heat preservation effect is better than the cold preservation effect.At the A value, the heat retention time is basically the same as the cold retention time.

At the same time, the water temperature when the water is filled is also affected by the heat preservation and cold preservation performance.Usually the hot water value is relatively fixed, usually at 96°C, but the cold water is not too large.The cold preservation effect of water at minus 5°C and minus 10°C in a vacuum flask will also be quite different.

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