[esp-r] on night ventilation

[武政 孝治]

Hi.

I have calculated the natural room temperature using night ventilation.
The size of a model is shown below. 
Height : 3m   Width : 4m   Depth : 5m
The air change rate of this model is 0.5 ac/h. 
The south window area used for ventilation is 3.5 m2 and the north window area is 1 m 2.
I attach the elevational view and sectional view of a model which were used for calculation. 

I calculated in the following procedures. 

(1)  I considered a three kinds model. 

A) The model which has not set up night ventilation.
B) The model which set up night ventilation.  
C) The model which  not be used it , although night  ventilation was set up.

I set up in the following procedures about B) and C).

(1) I chose network flow (menu) and defined Nodes, Components, and Connections. 
And Link nodes and zones was chosen. 

(2) I chose network flow from Controls. 
sensor details chose dry bulb temparature and flow actuator chose single flow connection. 

(3) I chose 1 day type by period data, and it defined B as follows. 
This my definition assumed that outdoor air temperature opened a window at 18 to 27 degrees at night. 

a 1 0.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 1.00 0.00
b 2 6.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 0.00 0.00
c 3 22.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 1.00 0.00

The definition of C) is shown below. 

a 1 0.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 0.00 0.00
b 2 6.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 0.00 0.00
c 3 22.00 outside ambient > low /default/mid/hi 18.00 22.00 27.00 0.00 0.00 0.00

(4) Annual natural room temperature was calculated. ( esp-r 11.11 GTK)

The room temperature graph in January and August is attached. 

*The followings are my questions. 
(a) The room temperature should become equal in January because the window is not opened , but it differs. 
The room temperature of B) and C) is equal, it differs from A). 

(b) I think that the room temperature of B in August  is right, there is an unusual value in the room temperature of C. 


Best regards,

Koji Takemasa ( Dr. eng. )

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