"TITLE","AUTHORS","SUBJECT","SUBJECT_RELATED","DESCRIPTION","PUBLISHER","AVAILABILITY","RESEARCH_ORG","SPONSORING_ORG","PUBLICATION_COUNTRY","PUBLICATION_DATE","CONTRIBUTING_ORGS","LANGUAGE","RESOURCE_TYPE","TYPE_QUALIFIER","JOURNAL_ISSUE","JOURNAL_VOLUME","RELATION","COVERAGE","FORMAT","IDENTIFIER","REPORT_NUMBER","DOE_CONTRACT_NUMBER","OTHER_IDENTIFIER","DOI","RIGHTS","ENTRY_DATE","OSTI_IDENTIFIER","PURL_URL" "Development of Direct Contact Heat Exchangers for solar energy utilization (III)","Kang, Y H; Jeon, M S; Yoon, H K; Kwak, H Y; Lee, N H; Yoon, J H; Yoo, C K; Lim, S H; Chun, W G; Won, S H; Kim, J B; Kim, N J [Korea Institute of Energy Research, Taejon (Korea, Republic of)]","32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; DIRECT CONTACT HEAT EXCHANGERS; HEAT TRANSFER FLUIDS; SOLAR THERMAL CONVERSION; FLUID FLOW; WORKING FLUIDS; WATER; HYDROCARBONS; BUILDINGS; SOLAR HEATING SYSTEMS; ENERGY EFFICIENCY; 320106; BUILDING EQUIPMENT","","The Direct Contact Heat Exchanger(DCHX) has been widely studied in the chemical industry for many years due to its inherent simplicity as a counter-current device for heat and mass transfer. The use of a Direct Contact Heat Exchanger, if properly applied, will allow several benefits. Primarily these include the elimination of the cost of a closed heat exhanger and the ability to operate with much lower temperature differences. Systems using Direct Contact Heat Exchangers are quite similar to Systems using indirect heat exchangers in many respects. In these systems, the DCHX unit can be combined with the thermal storage unit, or alternatively, it can be used separately from the storage unit, much like an external (to storage) closed heat exchanger system. Hence, either the DCHX system or the closed heat exchanger system can operate with the same number of pumps/loops. Some flow directions may be different between the two types of systems, depending upon the fluids used in the DCHX system. This is because the DCHX generally relies upon the force of gravity ot accomplish the fluid flow within the device. In the present work, the spray column type of direct contact heat exchangers are studied extensively to harness the solar energy for spaced heating. To carry out the flow analysis of working fluid in the spray column, numerical simulations are carried out extensively with the axi-symetric 2-dimensional two fluid model. In the simulation results, operation conditions have to be controlled to have a wide injection area, injection hole and small flow rate in the injection part to obtain uniform velocity distribution for maximum heat transfer in the main part of spray column. Some of the major considerations that are involved in the design of heat exchangers in this study are that; working fluid is a hydrocarbon (such as Texaterm) or water which is either lighter or heavier than storage medium.","KIER,Taejon (Korea, Republic of)","OSTI; NTIS (US Sales Only)","No corporate text available (Country unknown/Code not available)","","Korea, Republic of","1994-10-01","","Korean","Technical Report","","","","Other Information: PBD: Oct 1994","","Medium: X; Size: 131 p.","ON: DE95744270","KE-93005S","","Other: ON: DE95744270; TRN: KR9400142","https://doi.org/","","2008-02-12","10116149",""