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Re: [TRNSYS-users] Type 107: Absorption chiller data file: How do I calculate the fraction of capacity?

Leon,
I believe that fraction of capacity is the currently available capacity (due to non-design inlet temperatures, flow rates, ambient conditions, etc.) divided by the machine's rated capacity (at design conditions) and that the fraction of design load is the current load on the machine divided by its rated load.
The idea in all this is that the performance is based on two things: 1. the capacity and required energy input are a function of the inlet conditions as compared to design input conditions. 2. the required energy input (but NOT the capacity) depends on how much of the design load the machine currently has to meet. 
Best,
 David


On 5/10/2012 17:54, Leon Becker wrote:

Dear TRNSYS User,

for a research project I'm trying to simulate a hot water fired absorption chiller with TRNSYS 16. I thought I could create a datafile representing the performance of the Yazaki WFC-SC5 using the type 107 in the TRNSYS library.
After reading the Mathematical references and the existing threads I still don't understand the difference between fraction of design load and fraction of capacity. As far as I understand, the values I need to calculate for the data file are:

fraction of design load=capacity/rated capacity
fraction of design energy input= (required heat/ratedheat input) *fraction of design load
fraction of capacity=???

Please correct me, if I'm wrong. Moreover, I still don't get how to really calculate the fraction of capacity.

It would be a great help if someone could explain me the missing equation.

Does anyone have another idea how to simulate an absorption chiller with TRNSYS?

Thanks a lot.
Best regards,

Leon Becker
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