[TRNSYS-users] Questions about VENTILATION Type & HVAC components

[Chou Shen <csz59@mst.edu>]

Mr. David BRADLEY,

Thanks for your information in details about Type 56. It provides me some key points of Type 56. Now I have some other questions
on it. There seems to be too many words here, and I am sorry to take you too much time to read this. 


1. As you mentioned in the first simulation with Type 56----to get a basic idea
of how much energy the building will consume, use the VENTILATION Type with
outside air and use the COOLING Type to define set up temperature. I set the
VENTILATION Type with the conditioned air (temperature 16C), I think the
cooling load will change, but the results don't change significantly (<10%).
Also in the VENTILATION Type, I wonder the air change rate refers to the fresh
air or the mixed air (flow of fresh + return air) if the VENTILATION is set up
as outside.

2. In the file of BALANCE summary, the BAL_ENERGY is supposed to be zero,
according to the Manual. However my results indicate that this item is up to 10^6
kJ, and it doesn't equal to the sum of the other items. And there is not too much details about it on the manual.

3. I try to use Type 53 + Type 52 as the AC components of the Type 56, But when
I run the model, an error occurs, which says,

TRNSYS Message 350: Unable to open the file associated with an ASSIGNED logical unit number. Please check the statement and make sure that the file exists at the specified location. Reported information: Logical Unite=36, FileName=.

I am confused about this message, because it doesn't mention which part is wrong and the Manual doesn't help me too much. If I can read some examples including these components I think I could figure out how to use them correctly. Would you give me some tips about this error? To make it more straightforward, the connections are illustrated by the figure and table as following:

1	Type 53	TO	Type 52
	Evaporator outlet temperature		Inlet water temperature
	Evaporator outlet flow rate		Flow rate of water
2	Type 52	TO	Type 56
	Outlet air temperature		Coolair (VENTILATION Type input)
	Outlet air RH		CoolRH (VENTILATION Type input)
3	Type 52	TO	Equation Airchange
	Air flow rate		cool_air_rate
4	Equation Airchange	TO	Type 56
	cool_air_change		Coolairchange (VENTILATION Type input)
5	Type 56	TO	Equation M
	SQCOOL		Cool_demand
6	Equation M	TO	Type 53
	evaporate_flow_rate		Evaporator flow rate

Thank you for reading this message.

Merry Christmas!

-- 
Chou Shen
Graduate Research Assistant
Department of Civil, Architectural & Environmental Engineering
Missouri University of Science and Technology