[TRNSYS-users] Low temperatures using evacuated tube solar collector (type 71)

[ahmad abbasian via TRNSYS-users]

Hello

I'm simulating a solar assisted heating system. I have used type 71 (evacuated tube collector) for my model. The tested flow ate is 0.014kgr/S.m2 and the area is 2m2 so the flow rate is set to 0.028 kgr/S. The other parameters are based on the two attached tables. I'm wondering that the outlet water temperature is low which seems to be unacceptable. I think that the water outlet temperature can be reach to around 100 C in such collector, but the maximum temperature here is 40 C ! following is the inlet and outlet temperatures to collector. pump is controlled using a differential controller to be turned on whenever the outlet temperature is 5 C more than the inlet temperature. What is wrong with my simulation?





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Ahmad abbasianzadeh
Solar energy Researcher
Harrisburg, Pensylvania



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