• Title/Summary/Keyword: Unutilized heat

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Effect Analysis on Self-supporting Energy of Newtown Sewage Treatment Facility for Low-carbon Green City (저탄소 녹색도시 조성을 위한 신도시 하수처리시설의 에너지 자립 효과 분석)

  • Ahn, Soo-Jeung;Hyun, Kyoung-Hak;Kim, Jong-Yeob;Choung, Youn-Kyoo
    • Journal of Korean Society of Water and Wastewater
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    • v.24 no.6
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    • pp.683-690
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    • 2010
  • Renewable and unutilized energy (biogas power generation, wind power, solar, small hydro-power, sewage heat source, etc.) seems to be suitable to install for the sewage treatment facilities. There are 357 sewage treatment plants in 2007. 17 plants among these have been operating for self-supporting energy by using solar power, small hydro-power and biogas in 2008. Newly built sewage treatment plant of 96,000 $m^3$/day for a newtown is expected to get up to energy consumption of 10 GWh/yr. If solar energy, small hydro-power and biogas-equipments were applied to the new treatment plant, self-supporting energy of the new sewage treatment plant will get up to 56.1%. As a results, about 2,379ton $CO_2$/yr $CO_2$ emission reduction can be expected by using renewable energy. These efforts for self-supporting energy will lead sewage treatment plant to new energy recycle center.

LCC Analysis of a Heat Pump System Using River Water (하천수 열원 이용 열펌프 시스템의 LCC 분석)

  • Han, Sang-Soo;Park, Cha-Sik;Kim, Yong-Chan
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1424-1428
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    • 2009
  • The performance of a heat pump using river water as a heat source was compared with that of a conventional air-conditioner for cooling and a boiler system for heating. The heat pump system using river water considered the 1-stage cycle for cooling and the 2-stage cycle for heating. The COPs of the river water source heat pump were $0.5{\sim}1.1$ higher than those of the conventional system in the cooling season. The LCC of the river water source heat pump system was lower 13.5% and 32.4% than that of the conventional system I and II. In addition, when the initial cost ratios of the river water source heat pump system to the conventional system I and II were less than 1.2 and 1.4, respectively, an acceptable payback was found to be less than 5 years.

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A Study on Optimum Application of Unutilized Energies in the Jeju Environment Facility (제주지역 환경시설지구의 미활용 에너지 최적 활용방안에 관한 연구)

  • Kang, B.C.;Park, Y.C.
    • Journal of Power System Engineering
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    • v.11 no.3
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    • pp.9-15
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    • 2007
  • This paper provides a methodology for the optimization of waste heat usage in Jeju Province. The incineration plant was considered as heat source and the food garbage plant and the youth hostel were selected as heat sink of this study. The distribution of the reusing energy in incineration plant is decide by load analysis and numerical calculation of the operational methodology. The main objective of this study is on the reduction of the fuel costs and reuse of waste heat. As the results, the efficiency of the incineration plant and two heat sink, the food garbage plant and the youth hostel, are improved and economical suggestions are proposed through the optimization analysis.

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Study on Utilizing Resources in Ecopolis - Evaluation of Energy floors of Sewage for Enhanced energy system of residence - (생태도시에서의 자원활용에 관한 연구 - 주택 에너지 시스템 개선을 위한 하수 에너지흐름 분석 -)

  • 정용현
    • Journal of Environmental Science International
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    • v.12 no.9
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    • pp.911-919
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    • 2003
  • When the city water was heated for the optimum use of unused energy, the energy flows and losses were calculated and evaluated to improve the value of heated water systems at dwelling side. To obtain this purpose, it was simulated on heat flows under two conditions like with heat pumps or not and calculated the energy sayings. Furthermore, recycling water system was suggested for enhancing the value of heated water system. From this results, the energy flows without heat pumps showed that it was 3-4 percents of heat losses from pipes, 62 percents of energy savings from hot water uses and 34 percents of unutilized heat. When the heated water system adopt the recycling water system at dwelling side, it was improved 12 percents of total energy sayings.

A Study on the Factors Affecting the Performance of Plastic Plate Heat Exchanger (플라스틱 판형 열교환기의 성능에 영향을 미치는 인자에 관한 연구)

  • Yoo Seong-Yeon;Chung Min-Ho;Lee Yong-Moon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.9
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    • pp.839-848
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    • 2005
  • Plastic plate heat exchangers have many advantages over the conventional heat exchangers such as aluminum plate heat exchangers, rotary wheel heat exchangers and heat pipe heat exchangers which have been used for ventilation heat recovery in the air-conditioning systems. In the present study, pressure drop and heat transfer characteristics of plastic plate heat exchangers are investigated for various design parameters and operating conditions which affect the performance of the plastic plate heat exchangers. In flat plate type heat exchanger, material thickness and channel height of heat exchanger are considered, and corrugate size and heat transfer area are considered in case of corrugate type heat exchanger. Pressure drop and effectiveness of the corrugate type heat exchanger increase as the corrugate size decreases.

An Experimental Study on the Performance of Plastic Plate Heat Exchanger (플라스틱 판형 열교환기의 성능에 관한 실험적 연구)

  • Yoo Seong Yeon;Chung Min Ho;Kim Ki Hyung;Lee Je Myo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.117-124
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    • 2005
  • Aluminum plate heat exchanger, rotary wheel heat exchanger, and heat pipe heat exchanger have been used (or ventilation heat recovery in the air-conditioning system. The purpose of this research is to develop high efficiency plastic plate heat exchanger which can substitute aluminum plate heat exchanger. Because thermal conductivity of plastic is quite small compared to that of aluminum, various heat transfer enhancement techniques are applied in the design of plastic plates. Five types of heat exchanger model are designed and manufactured, which are plate type, plate-fin type, turbulent promoter type, corrugate type, and dimple type. Thermal performance and pressure loss of each heat exchangers are measured in various operating conditions, and compared each other. Test results show that heat transfer performance of corrugate type, turbulent promoter type, and dimple type are increases about $43\%$, $14\%$, and $33\%$ at the equivalent fan power compared to those of plate type, respectively. On the other hand, the heat transfer performance of plate-fin type decreases $9\%$ because fins can not play their own role.

A Study on the Factors Affecting the Performance of Paper Heat Exchanger for Exhaust Heat Recovery (배기열 회수용 종이 열교환기의 성능에 영향을 미치는 인자에 관한 연구)

  • Chung Min-Ho;Yoo Seong-Yeon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.10
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    • pp.956-964
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    • 2005
  • In order to control indoor air quality and save energy, it is needed to install a suitable ventilation system equipped with heat exchanger for heat recovery The purpose of this research is to find the factors affecting the performance of paper heat exchanger for exhaust heat recovery, which can be applied directly to the conventional ventilation unit, air-purifier, and air-conditioning system. In this study, thermal performance and pressure loss of the paper heat exchanger are measured and compared at various operating conditions. The effectiveness of sensible, latent and total heat at the face velocity of 0.75 m/s are $77\%,\;47\%\;and\;57\%$ in the cooling condition and $77\%,\;59\%,\;and\;\%$ in the heating condition, respectively. The effectiveness for sensible heat is only affected by velocity. On the other hand, the effectiveness for latent heat is affected. by temperature and relative humidity.

A Characteristics Simulation of Heat Pump System for Sewage Water as a Heat Source (하수열원 열펌프 시스템의 성능 시뮬레이션)

  • Park, Il-Hwan;Chang, Ki-Chang;Lee, Young-Soo;Yoon, Hyung-Kee;Baek, Young-Jeen
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.4
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    • pp.280-286
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    • 2008
  • In this study, characteristics simulation of heat pump system is investigated for heating and cooling using sewage water as a heat source. A simulation program for preestimate operation characteristics of heat pump system is developed. The performance of this system is resolved by several variables and the characteristics which is based on actual air and sewage temperature data. The simulation results agree well with the experimental values of COP. In the analysis of system characteristics, the COP is changed between $3\sim5$ in winter season for heating load, $4\sim6$ in summer season for cooling load. As the results of Life Cycle Cost analysis over a 15 year life cycle, the energy cost could be reduced by 250 million won if a heat pump system was used instead of a conventional boiler and an absorbtion refrigerator on the office building.

Feasibility study on district heating Magok area by sewage water heat source (마곡지구 하수열에너지이용 타당성 검토)

  • Lee, Young-Soo
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.357-362
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    • 2009
  • As a unutilized energy, treated sewage water locates widespread near urban areas. From the previous survey, the sewage water is reported to hold energy potential up to 36,000 Tcal/year, which was 2.1% of the total domestic energy consumption and 9.7% of the energy usage in the household and business sector in 2006. Temperature of the sewage water differs locally, but its range is observed in a range of $20{\sim}25^{\circ}C$ in summer and $8{\sim}13^{\circ}C$ in winter. Since the temperature range of the sewage water has a better seasonal distribution about $5{\sim}10^{\circ}C$ compared to ambient air, it is a promising heat sink for summer or heat source for winter. The sewage water is also a high quality heat source from its abundant quantity and uniform temperature. Considering the ambient temperature of Korea is very low in winter, a heat pump system using the sewage water can be an alternative to prevent problems of capacity deficiency and frost formation.

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Evaluation of Water Temperature Difference Energy of the Raw Water from Paldang Water Intake Station (수도권 팔당취수장 원수 이용 온도차에너지 부존량 조사)

  • Cho, Yong;Park, Jin-Hoon;Kim, Youngjoon;Park, Tae Jin
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.170.2-170.2
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    • 2010
  • The amount of the heating and cooling energy of water source heat pump using the raw water from the Paldang water intake station is investigated in the study. The Han river water is conveyed in the large-size shallowly buried pipe. Averaged water temperature at the position, 27 km from the Paldang water intake station, is increased by $1.11^{\circ}C$ due to the geothermal energy transfer under the ground, therefore the raw water has more thermal energy than the river water. To estimate of the thermal energy for the raw water, it is assumed that the water source heat pump is used for the heating and cooling ventilation. When $5.0^{\circ}C$ temperature difference energy of the raw water is used in the heat pump system all the year except for the January and February in which $3.0^{\circ}C$ temperature difference energy is used. It is predicted that total 5,766.3 Tcal could be used in the metropolitan area a year, which is about 3.0% of the river water unutilized energy resources.

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