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Appl. Sci. 2020, 10, 8341 4 of 17 which is transferred to ambient air for satisfying the cooling users need. The gaseous CO2 is then condensed in CS, and the liquid CO2 is fed to the LST for application in the next cycle. 2.1. CCHP Model For the compressor and turbine, isentropic efficiency is provided to represent their actual performance [24]: ηC = (his,e,C − hi,C) (1) (he,C − hi,C) ηT= (hi,T−he,T) (2) (hi,T − his,e,T) Enthalpy at the exit state is acquired through the property association f by using the REFPROP software [39]: his,e = f(sie,e,pe) (3) where sis,e equals to the inlet entropy during isentropic compression/expansion processes. The power is calculated by: W.=m. (h−h) (4) C CO2 e,C i,C W.=m. (h−h) (5) T CO2 i,T e,T For heat exchangers, the properties of supercritical CO2 can largely change in a small temperature band. Therefore, the heat exchanger can be discretized many small sections that each of them can be considered with constant properties [26]. The discretization is completed by splitting the total enthalpy variation of hot fluid into several equal parts. The heat transfer and mass flow rate of water or air for each section n are respectively calculated by: Q. =m. n water or air (h water or air,n+1 −h water or air,n Q. =m. h −h (6) ) (7) n CO2 CO2 ,n+1 CO2 ,n m. The HST and LST are presumed to be completely insulated and the inlet and outlet conditions water or air = n=1 (hwater or air,N+1 − hwater or air,1) (8) N. Qn have no difference [36]: Isenthalpic process is assumed through the throttle valve: he,HST = hi,HST, he,LST = hi,LST (9) he,TV = hi,TV (10) The heat transfer rate of CS is written as [24]: Q. =m. (h −h )=m. (h −h ) (11) CS CO2 hot,i hot,e CO2 cold,e cold,i 2.2. Conventional Exergy Analysis There is absence of chemical reactions in the developed CCHP system and the total exergy can be thus expressed as [32]: E. =m.e=m.h−h−τs−s (12) jjj00j0PDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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