Abstract
The paper contains a simplified energy and exergy analysis of pumps and pipelines system integrated with Thermal Energy Storage (TES). The analysis was performed for a combined heat and power plant (CHP) supplying heat to the District Heating System (DHS). The energy and exergy efficiency for the Block Part of the Siekierki CHP Plant in Warsaw was estimated. CHP Plant Siekierki is the largest CHP plant in Poland and the second largest in Europe. The energy and exergy analysis was executed for the three different values of ambient temperature. It is according to operation of the plant in different seasons: winter season (the lowest ambient temperature Tex = −20 °C, i.e., design point conditions), the intermediate season (average ambient temperature Tex = 1 °C), and summer (average ambient temperature Tex = 15 °C). The presented results of the analysis make it possible to identify the places of the greatest exergy destruction in the pumps and pipelines system with TES, and thus give the opportunity to take necessary improvement actions. Detailed results of the energy-exergy analysis show that both the energy consumption and the rate of exergy destruction in relation to the operation of the pumps and pipelines system of the CHP plant with TES for the tank charging and discharging processes are low.
Highlights
Nowadays, heat production for heating or domestic hot water is carried out in various ways
Heat can be produced on a large scale, e.g., for a whole city [15,16,17,18,19]
The thermodynamic parameters of the water at seven points of the system for block numbers 7, 9, and 10 were calculated on the basis of operational data of the combined heat and power plant (CHP) plant collected during the discharging process of the Thermal Energy Storage (TES) (1—before RP pumps, 2—after RP pumps and before XA heat exchanger, 3—after XA and before XB heat exchangers, 4—after XB heat exchanger and before SP pumps, 5—after SP pumps, 6—cold side of TES after DP pump, 7—cold side of TES before DP pump)
Summary
Heat production for heating or domestic hot water is carried out in various ways. This technology can improve the operational conditions of district heating systems This results, inter alia, in a reduction of heat and electricity production costs, reduction of emission of pollutants to the atmosphere, and increasing energy security for consumers [29,30]. Energies 2020, 13, x FOR PEER REVIEW of the water at seven points of the system for block numbers 7, 9, and 10 were calculated on the basis of operational data of the CHP plant collected during the charging process of the TES (1—before RP pumps, 2—after RP pumps and before XA heat exchanger, 3—after XA and before XB heat exchangers, 4—after XB heat exchanger and before SP pumps, 5—after SP pumps, 6—cold side of TES before control valve, 7—cold side of TES after control valve). The power of the pumps RP and SP and heating capacities of the heat exchangers XA and XB were calculated from the same Equations (1)–(4) as for operation of the plant without TES and for vaFriFgiiouguruesre3e.x3Pt.erPerrsnesasuslruaersierdstideaimgargparmearmafotfruotrrhetesh:eBTlBoelxcok=csk−Ps2aP0rat°roCtfo,CfTHCexHP=Pp1lpa°lnCatn,StaiSenikdeikeTirekerxik=(io1(po5epr°eaCrtaiotinonwwithitohuotuTtETSE)S. )
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