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Re: [TRNSYS-users] "reverse" tempering valve - using Type11b



Nick,

The Type953 tempering valve controller in the TESS Controllers Lib should be able to do this for you, no? It can be used in either heating mode or cooling mode. You may use with the diverters/mixers in the TESS Hydronics Lib to accomplish your task.

Cheers,

Matt



----- Original Message -----
From: "Nicholas LaHam" <ndlaham@gmail.com>
Sent: Thu, August 18, 2011 9:30
Subject: [TRNSYS-users] "reverse" tempering valve - using Type11b

Hey all,

 
I am trying to model something in TRNSYS that may already exist as! a component but I'm probably doing it the hard way. Any ideas are appreciated.

 
Basically I want to model a tempering valve that does the opposite of tempering. The tempering valve slows down the flowrate of a hot stream of water and adds the appropriate amount of cold water to be mixed in, based on a setpoint. What I am trying to do is this, I want to add the correct amount of HOT water from another source to heat up a COLD stream. Right now, I am basically using Type 11b in reverse to accomplish this by having the cold stream enter the valve, and have a tee piece mix in hot water. A "reverse" tempering valve if you will.

 
This seems to work, however I get the same warning at several timesteps "The inlet temperature and the heat source temperature have simultaneously exceeded the set point temperature. Gamma has been set to 0 (Mode 4) or 1 (Mode 5)"
!
 
This warning makes sense when the cold stream c oming in is already over the set point and no addition of hot water is needed. I am okay with this warning as I feel that it probably doesn't affect the simulation, but I just wanted to make sure.

 
Also I was wondering if anyone knows of a component that is built to do this, or another way to accomplish it in a more user friendly manner that makes more sense from an engineering standpoint?

 
Thank you,
Nick

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