[TRNSYS-users] CSHPSS - Is a seasonal storage really THAT usefull ??

[REBILLARD, Clement (Stagiaire CRPE)]

Dear users,

 

I am currently modelling and simulating CSHPSS with TRNSys and i built 2 models (see attached pics for hydraulic schemes) : 

1. A plant like the one in Friedrichshafen, with a water tank as seasonal storage (no DUCT storage).

2. The same but without the Seasonal storage (only Collectors - Buffer - Distribution Net).

 

For general info :

Seasonal storage : Type342

Buffer Tank : Type534

Demand : 1100 MWh/year

Collectors : 2200 m²

Seasonal : 4400 m3

Buffer : 100 m3

Mass Flow Rates in Collectors : 18 kg/hr/m²

Net Temperatures (depart/return) : 70/40 °C

I searched the Litterature and found that these values are quite OK for a CSHPSS. Should you think some of them are Over/Under-estimated, please let me know.

 

Solar fractions obtained for the 3rd year of use are the following :

1. 42.2 %

2. 32.7 %

I stop the simulations after the 3rd year because at that time, i observe a stationary behaviour. 

 

As visual results, I can clearly see that case 1. offers more Fs in winter months, so the seasonal behaviour is met when expected. However, considering the high price of a Seasonal Storage, and seeing such a poor gain in Fs for the whole year, I now wonder if a seasonal storage is that usefull ...

 

Have anyone ever asked himself the same question and experienced the same results ?

 

Many thanks,

 

Clement Rebillard,

For Veolia Environment

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