Re: [EnergyPlus_Support] control sequnce

[Qianmin Zhang <zqianmin@xxxxxxxxx>]

Dr. Li,

Thermal tank connect a cooling tower(source side/condenser loop) and the chilled water loop(use side). (no chiller or compressor in the system)

In thermal storage:

1. setpoint temperature, which seems used to determine whether the source side flow(condenser loop) is requested or not, when the tank temperature rise.
2. Source side availability schedule name, which is used to control the flow too.

In condenser loop:

1. condenser operation scheme, which seems used to control the condenser loop.

I feel like all above objects will are used to define one thing....

my project has a interesting schedule, which is unoccupied during weekday, most likely, and has a big occupancy number in weekend. 

I'm going to use the model of single speed cooling tower run in the "free convection" regime to simulate the night sky cooling roof to produce condenser water and collect them in thermal storage in the night time, and use these chilled water from thermal tank in weekend day time. When I use the chilled water from thermal tank during daytime, there is no flow in my source side, no matter how high the temperature is in tank, since I only have the night sky roof cooling in my condenser loop. I wish I state my issue clear. 

Is there any other method to simulate night sky cooling roof than cooling tower? I know about 60% heat is removed by radiant, not convection in night sky cooling. Thanks  a lot.

Regards,

Qianmin

On Tue, Jul 26, 2011 at 10:20 AM, YuanLu Li <yli006@xxxxxxxxxxx> wrote:

 

What is the control sequence you are considering?
 
Charging and discharging time, of the storage tank?
 
I have not look at the example yet.

 Dr. Li  

 

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To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: zqianmin@xxxxxxxxx
Date: Mon, 25 Jul 2011 17:20:29 -0700
Subject: [EnergyPlus_Support] control sequnce

 

Hello,

Besides .svg file, is there any other source could help me study the control sequence of each hvac system? I am looking at the chilledwaterstorage-stratified.idf, and there are schedules or setpoints for condenser water loop, thermal storage, and source side of thermal storage. I'm confused the control sequence in this system now. Anyone could help me better understand its sequence? Thanks a lot. Is there any override? 

Regards,

Qianmin

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