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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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.