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Energies 2020, 13, x FOR PEER REVIEW 3 of 25 Energies 2020, 13, 6576 3 of 24 these disadvantages of the stratified tank, but according to the knowledge of the authors, they have not been deeply analyzed in the literature, probably because the concept of variable volume is sctormatmifioednltyanasks,obcuiattaecdcotordoipnegntotatnhkesk.nowledgeoftheauthors,theyhavenotbeendeeplyanalyzedin the liItner[a3t1u]r,ea, psyrosbteamblyembepclaouysiengthae tcaonnkcewpithofvvaarriaiabblele-wvoatluerm-veoilsucmoemwmaosndlyesaisgsnoecdiataenddtopotpimenizteadnktos. minimIniz[3e1t]h,easeynsetregmyecmonpsluomyipntgioantawnhkilweisthatvisafyrianbglet-hweaitnesrt-avnotlaunmeeouwsaDsHdeWsigdneemdandofpatimseitzeodf2to0 mdwineilmlinizgest.hTeheenseyrgstyecmonussuems aptHioPnswpheciliealslaytiasdfyaipntgetdhfeoirntshtaenptarondeouuctsiDonHoWf DdeHmWan[d3o1f],aasevtaorfi2a0bdlew-welalitnegrs-. TvhoelusmysetesmtourasgeseataHnPksapnedciallyheadtarpetceodveforyr tuhneiptr(oHdRuUct)ioinoofrDdeHrWto[3m1a],xaimviazreiatbhle-wsyasterm-vogluombael setfofircaiegnectya.nk and a heat recovery unit (HRU) in order to maximize the system global efficiency. In this research, the inflfluence derived from the way in which the water is stored is going to be ◦ analyzed for energy recovery applications, considering a water heat source temperature of 30 °C which could correspond to an ULTDH network or waste heat from grey water applications. In order to do that, the stratifified tank, which is the most extended solution nowadays, is compared with the variable volume tank proposed in [31]. To this purpose, both cases have been simulated and their energy performancefromtthepoiinttooffvvieiewooffththeesysystsetmemhhasasbebenenanaanlaylzyezde.dT.hTehaenanlyasliyssinstienntdensdtos tcomcopmarpearbeobthotchacseaseusnudnedretrhtehesasmameecocnonddititoinosn.s.FuFrutrhtehremrmoroer,ei,ninoordrdeerrttooiidenttiiffythelocationsof energy deeggrraaddaatitoionn, ,ananddbebtetettreurnudnedrsetrasntadntdhethresureltsualntsdaqnudanqtuifayntthifeyutsheefuulnsesfus lonfetshseoefnethrgeyesnteorgedy isntobroedthitnanbkosth, atnaneknse,rgany aenderegxyeragnydceoxmerpgayricsomn apnaarilsyosnisaonfabloytshisToEfSbopthtioTnEsS, boapsteiodnosn, b[3a2se],dhoans b[3e2en], phearsfobremenedp.erFfionramlleyd, a. Fwinaaylltyo, bauwildayatvoabriuaibldleavvoalurimabeletavnokluinmcelotsaendk rienalclsoyssetdemresawl silylsbtempsrowpiollsebde. Tphroepfionsaeldp.uTrhpeofsienaolfpthuerpoasperofisthtoecpoanpcelurdisetwohcoatnicsluthdebwehstaTtEisSthopetbioenstfTorESaboopotisotnerfHorPasbyostoesmterwHitPh esynsetregmy rwecitohvenryerfgroymreacolovwerytefmropmeratluorwe wteamteprehraetautrseowuracte.r heat source. Inorrdeerrtotoprpersesnetnthtitshwisowrko,rthke,athrteicalertiiscolergiasnoizregdanaiszfeodlloawssf:oFlliorwst,sa:Fdiersctr,ipatidoenscorfitphteioanaolfyztehde caansaelsyzthedemcaosdeseltchreamteodteolsctrueadtyedthteomstaundyththeecmonadnitdiotnhseincowndhitcihonthseinsywstheimchswtheresycsotmempsarwederies pcoremsepnatred.iTshperne,sethneterdes.uTlhtsense,cthtieonrepsurelstsensetsctihoenrpesruesltesnotsbtahienreedsufolrtseoabchtasinimedulfaotrioenacahndsimacuolamtipoanriasnodn amcomngpathriesmon. aLmatoenrgonth,eamp.rLoaptoesraolnin, aoprdroerpotosabluinildoradverartioablueilvdoaluvmareiatabnlekvionluamcleostaendksyinstaemcloasned fisynsatlelmy tahnedmfaininalclyonthcleumsioains coofntchleuswionrks oafrethperewseonrkteadr.eFpinreaslelyn,taend.AFpinpaelnlyd,iaxnAAwpipthenadnixenAerwgiythanadn exnergyanadlyesxiesrogfybaontahlytasniskosfhbaosthbeteankinschluasdbedeewnhinichlucdoeudldwheilcphtcoulndhereslptatnodufnrodmersthtaenqdufarloimtattihve pqouianlittoatfivieepwotihnet oqfuvainetwitatthiveeqoubatnatintaetdivresoubltasionfedthreepsualptesro. f the paper. 2. System Description 2. System Description This section describes the analyzed systems, in order to do that, it is divided in four parts: In the This section describes the analyzed systems, in order to do that, it is divided in four parts: In the first one, the systems under study are presented. In the second one, the models used to simulate first one, the systems under study are presented. In the second one, the models used to simulate these these systems and their corresponding components are described, and finally, in the last two sections, systems and their corresponding components are described, and finally, in the last two sections, the the selected performance parameters and the employed simulation matrix are introduced. selected performance parameters and the employed simulation matrix are introduced. 2.1. Cases Analyzed 2.1. Cases Analyzed Figure 1a presents the general layout of the conventional solution, HP coupled with TES and HRU, Figure 1a presents the general layout of the conventional solution, HP coupled with TES and with a stratified storage tank, whereas Figure 1b presents the system with the variable-water-volume HRU, with a stratified storage tank, whereas Figure 1b presents the system with the variable-water- TES system proposed in [31]. volume TES system proposed in [31]. Figure 1. Illlusttrattiion off the two Thermal Energy Storage Tank cases compared: (a) System with stratifified tank and (b) System with variable water volume tank..PDF Image | Thermal Energy Storage Strategy Booster Heat Pump Low Temp
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