Re: [TRNSYS-users] Type 666 Chiller Queries

[Jean Marais <jeannieboef@gmail.com>]

Wow. You stated these questions so well that I can only think that you did so already knowing the answeres.
1. You can't. You need a comprehensive data set from your chiller supplier, specifying a matrix of COPs at different water temperatures on supply and return side as well as condenser supply and return side.
2. This will be clear in the data set. It is very possible.
3. There is no mathematical thermal corrolation. It is chiller dependant. It is a different data set.
4. Yes. You'll need data at all the points where your chiller may operate at. For example if you don't have data for the chiller performance at less than 20% of full rated capacity, then the simulation will issue a warning when your chiller model is required to output results at these conditions (most chillers will turn off below 20% demand).
5. Correct.
I stand corrected on any points.

On 15 February 2013 10:36, #YEO KEAT KEE# <YEOK0031@e.ntu.edu.sg> wrote:

Dear Fellow Trnsys Users

 

I am a new user to Trnsys and is modeling a water cooled chiller system using type 666 as the chiller.  

 

I understand that if I want to model a specific chiller model in the system, I will have to make changes to the chiller performance data file and the part load performance data file.

 

In the chiller performance data file, I see that there the capacity ratio and the COP ratio being defined as 1 at 7C Outlet CHWT 30C INLET CWT.

 

1.       If I only have the performance data of the chiller at  6.7C Outlet CHWT 29.4C INLET CWT, how can I make use of this data to input it into the chiller performance data file?

 

2.       Must the capacity ratio and the COP ratio being defined as 1 at 7C Outlet CHWT 30C INLET CWT, or can it be defined as 1 at other  Outlet CHWT and Inlet CWT ?

 

3.       How does the part load ratio data of the chiller relate to the different Capacity Ratio and COP ratio ?

 

4.       In the parameter tab of the type 666 chiller, it is stated that “The capacity of the machine at its rated condition (typically 30 C (85 F) inlet cooling water temperature and 7 C (44 F) chilled water set point temperature)The data file associated with this model should be consistent with this rating conditions.” . Does it mean that I have to include the chiller performance at 7C chilled water set point and 30C inlet cooling water temperature in the chiller performance data file ?

 

5.       In the chiller performance data file, it is observed that the chiller capacity ratio can be more than 1.  Does this means that the chiller current capacity is higher than the rated capacity?

 

Can anyone kindly advice on the above mentioned queries ?

 

Thank You !

 

Best Regards

KK Yeo

 

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