[TRNSYS-users] Type743’s power coefficients parameter setting

[吴伟伟v v]

Dear all,        In the type743’s document, there is an equation743.1 about P, which is power drawn the pump, as following:P=a0+a1(m/mrated)+ a2(m/mrated)2+ a3(m/mrated)3+………..In the type743’s parameter setting, parameter number 5 is set to“number of power coefficients”,if I input “3”then the parameter number6、7 、8 is as following：power coefficient-1power coefficient-2power coefficient-3And the explanation about the coefficient is “The value of the polynomial multiplier for the relationship between normalized pump power and normalized pump flow rate”.My question is:1)whether a1、a2 a3 is correspond to power coefficient-1、power coefficient-2 and power coefficient-3 respectively? if yes, how to set the value a0? or i just need fitting an equation that a0 is zero?2)If not ,what is the right relationship between them?In addition, I referred to an example named “pumps with flow rate known” in Tess models of TRNSYS software, the type743’s parameter 5 is set to 3, and the parameter6 and 7 (power coefficient-1、power coefficient-2) are  both  0, while parameter 8 is set to 1. The similar situation setting could be found in other types such as TYPE510’s power coefficient.Thank
you very much help me out of this issue.
With best regards
Yours sinscerelyWeiwei
Chongqing university

 
Thank you very much help me out of this issue.  		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20151116/10446127/attachment-0003.htm>