On 2021-09-01 11:29, Ali Shahrouzian via TRNSYS-users wrote:
I want to simulate a solar collector loop whose collector outlet temperature is equal to or greater than an arbitrary quantity. It goes without saying some components (Type 539 and 538) just set the outlet temperature to an arbitrary set-point temperature. In other words, the outlet temperature always equals a value no higher than that.
Simply set the flow rate to zero. Your collector will always then return the maximum possible temperature. Of course this is unreasonable in practice as there is no flow - but then so is the idea of having your collector be as hot as possible. The hotter the collector the worse the performance. The best thing you can do is have your collector operate at the lowest possible temperature that still meets the need of your load. And that is exactly what Type 538 and Type 539 do. If you need your load to be met at a collector temperature of 80 C then you simply put in 80 C and the collector will deliver that temperature, if it can, with as much flow as it can. If it can't meet the temperature then it won't run. If it is flow constrained then it will operate at the maximum flow and the outlet temperature will rise above the setpoint.
Jeff -- Jeff W. Thornton President Thermal Energy System Specialists LLC 3 N. Pinckney Street, Suite 202 Madison WI 53703 USA (608) 274-2577 www.tess-inc.com