how to simulate a fan and pad cooling system for greenhouse in trnsys?

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Dear All I'm simulating a greenhouse using multizone building. Fan and pad is a conventional system in greenhouse. In this method, one of the greenhouse walls is replaced with a wet pad. On the other side there are fans. In order to simulate this method , I need to define we pad as awall in the building. Also the air fans on the other side should be considered. Could anyone guide me how to model it? Inline image 1