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Re: [TRNSYS-users] Tank losses in general and Type4
Dear Michael Diekerhof.
I suppose that you already have a transys model with at least: solar collector, solar field pump with control sistem, tank storage, auxiliary source and a variable demand.
To study the possitive effect of increasing the size of the system you can use constant design ratios for the equipments and increase the annual demand.
I use at least three important ratios.
1) RAD (Ratio Area Demand) which is the area of solar collector divided by the annual demand. (m2 / (MWh/a)) {ex 0,5}
2) RFA (Ratio Flow Area) which is solar field flow divided by the solar field area ((m3/h)/m2) {ex.0,020}
3) RVA (Ratio Volume Area) which is the volume of the seasonal storage divided by the size of the solar field (m3/m2). {ex. 2}
Keep these three ratios constant and change the annual demand. Sistems with different size will be simulated and an increase of efficiency in the seasonal storage will be seen.
Greetings,
Mateo de Guadalfajara
2013/1/13 Michael Diekerhof
<Michael.diekerhof@web.de>
Dear all,
I´m working with Type 4 to simulate a stratified storage tank.
I have a question due to my results. If the storage volume (liters) increases of course the absolute tank losses (Wh) are getting higher as well. But how can i show that the relative value decreases if the storage tank gets bigger? The literature says, that the relative tank losses decrease with a higher tank volume since the relation of volume to surface increases.
But even if I compare the "tank losses" to the "energy from heat source", the relative value gets higher with a bigger storage tank.
I am very thankful for any suggestions to answer this question.
Best,
Michael
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