Re:[EnergyPlus_Support] Re: How to model the primary/secondary pump system

[韩星 <foolishstar@xxxxxxx>]

Thanks Jean, I also saw your reply in the DB forum.

However, I didn't find the water tank object. I cannot figure out the schematic flow of the primary/secondary pump system using a water tank either.

Dr. Li, can you give us a hand?

At 2011-10-25 12:34:34,"Jean marais" <jeannieboef@xxxxxxxxx> wrote:

 

Excellent question. I would also love to know, especially if primary and secondary loops have different temperatures. E.g. it's common to feed 50degC water from a secondary loop into a radiant system, but 80 degC water to the AHU heating coil.

Dr. Li proposed to use the water tank object. I've not looked at it. If it has 4 ports, and a temperature setpoint set lower than the primary loop, I would hope that the two connections to the primary loop will only circulate to maintain this setpoint. In theory I can see this working. In practice, I've not tried it or investigated, but it's on my to-do list.

The last time I had this problem, I figured to send the AHU coil water at 40 degC, and blindly hoped that it would extract the required energy by simply increasing the coil surface area (tube length) indefinately large.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, º«�� <foolishstar@...> wrote:
>
> According to the requirement of 90.1, chilled-water systems with a cooling capacity of 300 tons or more shall be modeled as primary/secondary systems with variable-speed driveds on the secondary pumping loop.
> I wonder how to model the primary/secondary system in E+. Is there any example file?
> Thanks!
>

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, º«�� <foolishstar@...> wrote:
>
> According to the requirement of 90.1, chilled-water systems with a cooling capacity of 300 tons or more shall be modeled as primary/secondary systems with variable-speed driveds on the secondary pumping loop.
> I wonder how to model the primary/secondary system in E+. Is there any example file?
> Thanks!
>

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