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Old   April 3, 2010, 05:19
Question Door opening and closing
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Rana
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Hi all,

I need to simulate the door opening and closing for a freezer box, and have no idea of how to do it.

can anyone help me to solve the problem.

thanks in advance.
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Old   April 4, 2010, 02:58
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Hongjin Wang
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will your model be a steady/ an unsteady one ?
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Old   April 7, 2010, 02:06
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it will be an unsteady one
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Old   April 7, 2010, 03:52
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Hongjin Wang
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Hi, would you tell me more details about the aim of your study? Do you wanna study the influnce of close-open numbers in a certain period on system energy consumption, or something others?

regards,
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Old   May 3, 2010, 04:50
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Hi,

First let me apologize for my late reply.

yes, i want to study the influence of temperature distribution and heat transfer to surrounding when the door is opened based on number of times, lets say for 5 min for every hour and for the rest it's in closed condition.
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Old   May 3, 2010, 08:09
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sorry, I did not see this letter till now. I have an idea. It works like this : since you mainly focus on the effect of environment, you might treat the refrigeration simply as a cube-profile heat source in a large space. Every face of this cube has a different heat rejection rate. I suspect the door could be treated as heat sink rather than a heat source when it opens. Since the door open will play a role on the COP of the refrigeration, I thought the panerlization caused by door open should be considered in the model as while. And detailed data of this panerlization can be gained by test a real frigeration in one door-open-close-till-steady process. And you can write this data as a profile or a UDF to control the heat production rate of the cube in your model. And set up your model as an unsteady one with a time dependent heat source. But here is another thing: the above model suspect that the effect of each open can be added to the others algebracially and your UDF will include some condition sentences.
Still I am not quite sure will this model works because I did not try it. but I hope it is helpful.

Regards,
HJ Wang
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