Re: Question about Differential Controller (type 2)

["KCR" <Rauch-Muenster@xxxxxxxxxxx>]

Hello,

first of all I remark that I do not know the differential controller with
four PARAMETERS and four INPUTS. But with some old paper-copies from release
April 1981 I suggest that there has been unfortunately happened a change of
the two output values of the unit 50 type 4: Output 1 is the temperature to the 
heat source (the temperature of the lowerst segment; cold side) and Output 4 is 
the temperature to the load (the temperature of the most upper segment; hot 
side). This change in conjunction with the selected PARAMETERS will 
substantially 'confuse' the mathematical algorithm which belongs to this 
component.
Kind regards
Christian


Jong, M.J.M. schrieb:
> Dear TRNSYS users,
>
> At this moment I am busy with simulating a house with a solar collector on
> it. The heat of the collector will be stored in a tank. To control the flow
> through the collector I use the differential controller (type 2 in TRNSYS).
> When the outlet temperature of the collector >10 0C than the temperature in
> the top of the tank there will run a flow throug the collector. When the
> outlet temperature < 2 0C than the temperature in the top of the tank, than
> the pump will be switched off. 
>
> I defined the controller, the pump, the ducts and the collector as you can
> read below.
> (Unit 50 is Stratified fluid storage tank (type 4)
>
> UNIT 40 TYPE 1 COLLECTOR VOOR WARM TAPWATER
> PARAMETERS 14
> 1  1 Oppcol Swarmte 1 77 0.56 18 0.0612 -1 4.19 1  0.0087 0.0963
>
> INPUTS 10
> 46,1 42,2 0,0 14,2 14,7 11,16 DIFHOR 0,0 13,16 0,0
> 3.5  0    0   0    0    0     0      0.2 0     35
>
> UNIT 41 TYPE 2 PUMP CONTROLLER POMP VOOR TANK WARM TAPWATER
> PARAMETERS 4
> 7 10 2  60
>
> INPUTS 4
> 40,4 50,3 40,4 41,1
> 5    20   5    0
>
> UNIT 42 TYPE 3 PUMP VOOR TANK WARM TAPWATER
> PARAMETERS 4
> Debiet 4.19 Ppompcol  0.3
>
> INPUTS 3
> 45,1 0,0    41,1
> 10.0 Debcol 0.0
>
> UNIT 43 TYPE 31 Leiding van collector naar warmtewisselaar voor tapwater
> PARAMETERS 6
> 0.038 30  6.3 1000.0  4.19 10.0
>
> INPUTS 3
> 40,4 42,2 30,15
> 0    0    5
>
> UNIT 45 TYPE 5 HEAT EXCHANGER TUSSEN COLLECTOR EN TANK VOOR WARM TAPWATER
> PARAMETERS 4
> 2 129600 SWARMTE 4.19
>
> INPUTS 4
> 43,1 42,2 48,1 42,2
> 0    0    0    0
>
> UNIT 46 TYPE 31 Leiding van warmtewisselaar tapwater naar collector
> PARAMETERS 6
> 0.038 30  6.3  1000.0  4.19 10.0
>
> INPUTS 3
> 42,1 42,2 30,15
> 0    0    5
>
> When I look at the flow through the collector, the outlettemperature of the
> collector and the temperature in the top of the tank, I see that there will
> be a flow when the outlet temperature of the collector << 10 0C than the
> temperature in the tank. Sometime when the temperature difference is >> 10
> 0C there is no flow.
>
> Does anybody know what to do to get the right control strategie ? 
>
> With kind regards,
>
>
>
> Maurice Jong.
>
> =====================================================================
>
> Maurice Jong
> ECN - Energy Research Foundation      Department: Wind, Group DEGO
> P.O. box 1    1755 ZG  Petten              Country:   The Netherlands
> Telephone:    (+31) 224 564938             Fax:       (+31) 224 563214
> E-mail: jong@ecn.nl
> Internet:http://home.soneraplaza.nl/mw/prive/mjmjong/
>
> =====================================================================
>