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Development of Direct Contact Heat Exchangers for solar energy utilization (III)

Technical Report:

Abstract

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  More>>
Authors:
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 [1] 
  1. Korea Institute of Energy Research, Taejon (Korea, Republic of)
Publication Date:
Oct 01, 1994
Product Type:
Technical Report
Report Number:
KE-93005S
Reference Number:
SCA: 320106; PA: KR-94:000142; EDB-95:036013; SN: 95001335458
Resource Relation:
Other Information: PBD: Oct 1994
Subject:
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
OSTI ID:
10116149
Research Organizations:
No corporate text available (Country unknown/Code not available)
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Other: ON: DE95744270; TRN: KR9400142
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
KR
Size:
131 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

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, and Kim, N J. Development of Direct Contact Heat Exchangers for solar energy utilization (III). Korea, Republic of: N. p., 1994. Web.
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. Development of Direct Contact Heat Exchangers for solar energy utilization (III). Korea, Republic of.
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, and Kim, N J. 1994. "Development of Direct Contact Heat Exchangers for solar energy utilization (III)." Korea, Republic of.
@misc{etde_10116149,
title = {Development of Direct Contact Heat Exchangers for solar energy utilization (III)}
author = {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, and Kim, N J}
abstractNote = {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.}
place = {Korea, Republic of}
year = {1994}
month = {Oct}
}