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Hello, I am trying to simulate a solar cooling system using type 71 (evacuated tube collectors), type 107 (absorption chiller) and type 51b (cooling tower) in order to cool a 100m2 building (type 56) in Athens. I also use a storage tank (type 60c). I have two problems running the program, so i would be thankful for any help/ advice. 1) I use the external file given at the example data files for type 107 and i wonder if it is possible to change the range of the inlet hot water temperature since the given one is too short and the values are too high (108C-116C). I noticed that the model doesn't work properly when using temperatures out of the range given in the data file. If this is not possible is there any other that i can use? 2)The main problem of my simulation is to keep the temperature in the tank at the above range. I tried to use the tank's auxiliary heater but the energy required is too high and it also remains the same regardless the total collectors' area. In addition when i use a smaller tank (in order to achieve higher temperatures) i get the following error: "A convergence problem was encountered. Modification of the tolerances control card may cure the problem" and also too many warning messages: ''The inputs to the listed units have not converged at this time step. The values at the last iteration will be used and the simulation will proceed. Reported information: UNITS: 13 17 26 27 12". Thanks in advance, Nikoleta Get news, entertainment and everything you care about at Live.com. Check it out! |