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be obtained from the local meteorological data. Design indoor temperature ti is usually set as 18 °C in China. The heating load characteristic curve during the heating period in Figure 2 shows that the relative heating load is initially constant for 5 days and then decreases nearly linearly with the increase in duration. Energies 2020, 13, 6256 5 of 19 Figure 2. A typical characteristic curve of heating load. Figure 2. A typical characteristic curve of heating load. Figure 2, also known as the heating load duration graph, shows the variation characteristic of the heFatiignugrelo2a,daolsfothkenohweantinasgtnhetwheoartkindgetleoramdidneudrabtiyonthgerdaipffhe,reshnot woustdthoeorvatermiatpioenractuhraeradcuterraitsitoincso.f Tthheethimeaetiingtelrovaadl of the heattiingnloetawdodrukrdaetitoenrmgirnaepdhbryepthresdeniftfsertehnetwouhtodloeohretaetminpgepraetruiored,daunradtitohnes. abTshceistsiamsetairnttaenrvdaelnodfthimeehoeaftihneghleoatdindgulroatdiodnugrraatipohnrgerparpehseinstnsotthtehewahcotlueahlheaetaitninggpsetrairotda,nadndentdhe tiambes,cbisusattshtaertimanedoefnddutriamtieonofothreahceartaininghloeadtindgurloataidonwghriacphhdiespneontdtsheonactthueaoluhtedaotionrgtsetmarptearnadtuerne.d Tthiemien,ibtiualt tihmeetiomfethoef adbusrcaitsisoancforreascpeorntadins thoetahtienlgowloeasdtwouhtidchoodretpeemnpdesroantutrhee, aonudtdeoaocrhtetimpeeorfatuhree. abTshceisisnaitcioarlrteimspeonodfsthteoabnsociustsdaocorrtremsppoenrdatsutroe.thEeaclohwoeusttdouotrdtoeomrptermatpuereatlausrtes,faonrdaepaecrhiotdimoeftoimf teh.e Waibthsctihsseaincocreraesepoindthsetoduanraotiuotnd,otohretceomrrpeesrpaotundrei.nEgaocuhtoduotodrotoemr tpemerapteurraetugreadlausatsllfyoirnacrpeearsieosd, soof tihmee. hWeatitinhgthloeaidngcreaadsueailnlytdhecdreuarsaetsi.on, the corresponding outdoor temperature gradually increases, so the Ihneadtidnigtilona,dfogrrathdeuianllityiadlepcerreiaosdeso.f time, the time period in which the relative heating load curve remainInspaadrdalilteiolnto,tfhoreathbescinssitaialxpisereiopdresoefntismthe,ethimeetiwmheepnetrhioedacitnuawlhouicthdotohretreemlapteivraetuhreeatiisnlgowloeard thcaunrvtheereomutadinosorpdareaslilgenl toemthpeearabtsucriess.aTahxisistirmeperreespenretsetnhtestihmeenwumhebnerthoef dacatyusaflooruwtdhoicohr theme hpeartaitnugre effiselcotwisenrothtagnuathraenotuetedo,owrhdiecshigisnutesmuaplleyra5tudraey.sTihnisCthiminear.eAptrethseisntsimthee, tnhuemhbeeartionfgdlaoyasdfroerawcheischththee mhaexaitminugmefdfescitgins hneoattignugalroaandteaendd, wrehmicahinissuunscuhalnlyge5dd. ays in China. At this time, the heating load reaches the maximum design heating load and remains unchanged. 2.3. Load Characteristic of Absorption Heat Pump in Heating Supply System 2.3.1. Model of Heating Network Regulation In the actual operation of the heating network, the temperature or the flow rate of the supply and return water can be adjusted to meet the demands of the client. The water temperature control method, which is widely used in China, can be used to control the supply and return water temperature of the heating network and meet the heating load, while the water flow remains constant. As the heating load mainly depends on heat consumers, the temperature of the supply and return water of the secondary heating network must be determined first to adjust the temperature of the supply and return water of the primary heating network. Under this temperature adjustment method, the supply and return water temperature of the secondary heating network can be calculated by Equations (5) and (6), respectively [27]. t =t +0.5(t′ +t′ −2t)Q 1 +0.5(t′ −t′ )Q , (5) soi sosiih1+b sosih t =t +0.5(t′ +t′ −2t)Q 1 −0.5(t′ −t′ )Q , (6) sii sosiih1+b sosih where t′so and t′si are the design supply and return water temperature of the secondary heating network, respectively, and b represents the index for the radiator.PDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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