A sealed container? I'm not following the physics on this. I can only assume you're talking about evaporative cooling of some sort. This was not an open container.
No, you need to insulate the container from the ground. Then you have conductive and radiative heat gain and loss with the air. Works better on top of a hill, in the middle of a field, under a clear sky. The container has to have minimal thermal mass, and be a food conductor but that's it.
PS: An easy demo is a car roof with the windows open at night in a field.
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That means less than you would think as a container with the same setup and no meta material at night would also drop below ambient temperature.
A sealed container? I'm not following the physics on this. I can only assume you're talking about evaporative cooling of some sort. This was not an open container.
No, you need to insulate the container from the ground. Then you have conductive and radiative heat gain and loss with the air. Works better on top of a hill, in the middle of a field, under a clear sky. The container has to have minimal thermal mass, and be a food conductor but that's it.
PS: An easy demo is a car roof with the windows open at night in a field.
They did insulate the container from the ground.
Which is why I am saying this. The important thing at night is not delta from ambient temperate, but the delta with and without their covering.