Re: [TRNSYS-users] Values energy gain (Heat)

[David BRADLEY <d.bradley@tess-inc.com>]

Oswaldo,
 There are many reasons why the simulation and the measured data are not matching. Of course it is important to make sure that the parameters of Type74 match the parameters of the actual system. Keep in mind that Type109 reads "average" water data that is supposedly compiled over a long period of time. Much the the data available for Type109 (and the much preferred Type15) is modeled and not measured at all. If you have measured data for the site then you can use a combination of Type9 and Type16 to read and process the data then pass it to type74.
Kind regards,
 David


On 8/9/2011 21:24, Oswaldo Hidalgo Barrientos wrote:

Dear all

I am simulating a couple of Type weather Type109-TMY2 (CO-Bogota El dorado) and a Type74 (CPC Collector)...the values of "useful energy gain" of CPC Collector in one day standard of simulation are between 9am:1248kJ/hr (2738HP), 3pm:656.4kJ/hr(1674HP) with max at 1:30pm:2184kJ/hr(4422HP). 

My problem is the next: I have operating a real parabolic solar collector and it give me a "useful energy gain" average value of 1HP or 740W, as your can look, the different between real practic values and the trnsys values is so much. I think that can be because  the units simulation are in hours, example: kJ/hr,. but really I dont understand this condition.

If in the simulation studio I add a new equation where it divides useful enegy gain in 3600seconds, the new values are 9am:0.76HP, 3pm:0.465, 1:30pm:1,23HP this values are so similar at reality.

My question is, how could I do to that the values of simulation be as reality values without use the equation on the simulation studio? or what is the correct way to simulated this couple?

best regards

Oswaldo Hidalgo.

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