• Title/Summary/Keyword: Heating cost

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The Comparison of Maintenance Cost and Residents′Consciousness of Remodeling by Rental Apartment Types (임대아파트 유형별 유지관리비와 거주자의 리모델링 의식비교)

  • 박민용;장승재
    • Journal of the Korean housing association
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    • v.14 no.4
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    • pp.69-76
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    • 2003
  • Considering the present development situation of rental apartment since 1982, the supply of rental housing for low-income dwellers has contributed a amount of quantities, but has been deficient qualities in housing policy. To propose the device of remodeling for low-income dwellers in deteriorated apartment, this study investigated the characteristics of maintenance cost and the residents'consciousness of remodeling by rental apartment types. The results of this study were as follows; The annual maintenance cost of permanent rental apartment was 14,249 won/$\textrm{m}^2$$.$yr, that of fifty years period rental apartment was 13,372 won/$\textrm{m}^2$$.$yr. In the case of remodeling in deteriorated heating system, the principal decision factor of choice was showed “economics” as priority. Residents in rental apartment preferred remodeling to reconstruction, and unit heating system to central heating system.

Study of Energy Cost for Performing Flush-out in Newly Constructed Multi-residential Buildings during Winter Season (겨울철 신축 공동주택의 플러쉬아웃 시행 시 난방비용에 관한 연구)

  • Lee, Ki Yong;Kim, Kee Han;Park, Jun-Seok
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.28 no.3
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    • pp.110-114
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    • 2016
  • Newly constructed multi-residential buildings with more than 500 households should be flushed out indoor contaminants using a mechanical ventilation system or large fans after the completion of construction and prior to occupancy by the Heath-friendly Housing Construction Standards since 2014. In addition, the standard recommends to maintain indoor temperature over $16^{\circ}C$ and relative humidity below 60% while performing the flush-out. However, it is difficult to maintain these recommended indoor conditions, especially during winter season because additional energy cost is needed for space heating. Therefore, in this study, additional energy cost including heating and ventilation energy cost in multi-residential household for flush-out during winter season was estimated using building energy simulation program called EnergyPlus. Additional energy cost according to various conditions for performing flush-out (such as performance period, ventilation rate, and heating set-point temperature) was analyzed. Based on the results of the energy simulation, the energy cost was estimated to be ranged from 14,625 to 29,452\/household in Incheon city and from 3,521 to 26,268\/household in Gwangju City. There was no significant change in energy cost according to the performing terms of flush-out between Incheon and Gwangju City.

Energy Consumption Characteristics and Evaluation of Thermal Insulation Performance in Accordance with Built Year of Apartment Complex (공동주택의 준공연도에 따른 단열성능 평가 및 에너지소비 특성에 관한 연구)

  • Choi, Doo Sung;Lee, Myung Eun;Chun, Hung Chan
    • KIEAE Journal
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    • v.14 no.3
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    • pp.79-86
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    • 2014
  • Studies have shown that the thermal performance of buildings changes depending on the year of construction completion. It leads to increased energy consumption of buildings and significant financial burden on users. Thus, this study has calculated the thermal insulation performance of 86 apartments quantitatively, using temperature difference ratio and sensible heat flux. Also, energy consumption characteristics depending on the year of construction completion and thermal insulation performance were analyzed by comparatively analyzing the results of insulation performance evaluation and heating costs. The analysis results are as follows. As for thermal insulation performance, it was around 70% lower in the apartments completed before 1985, compared to apartments completed after 2010. As for heating costs, the apartments with the highest heating cost incurred 1.5 higher heating cost than the apartment with the lowest heating cost. In terms of the insulation performance evaluation, the difference was 2.5-fold.

Reheating of Semi-Solid Material Using Multi-Capacity Induction Heating System (다출력 유도 가열 시스템에 의한 반용융 소재의 재가열)

  • 정홍규
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03b
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    • pp.199-202
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    • 1999
  • Many processing times for fabricating complex shaped parts by near net shape process such as thixoforming or semi-solid forming, are required due to the time for die design, induction heating and forming process. Therefore, for the thixoforming process, multi-capacity induction heating process is very important due to the reduction of the processing time and cost. It is indispensable to adopt a power-time heating pattern which manages to conciliate complete eutectic melting at the core with limited overheating at the periphery. The total reheating time is thus dependent on billet diameter; in inches$(pm20%)$. Typically, high frequency is used for the rapid reheating of the billet to the eutectic temperature range and low frequency for the remelting of the desired fraction of liquid and for the radial homogeneization of the liquid fraction. So in this study, the multi-capacity induction heating conditions of ALTHIX 86s alloy to reduce the processing time and cost would be proposed. The suitability of multi-capacity induction heating conditions would be verified through the comparison to Garat's data.

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Optimizing the Life Cycle Cost of a Solar Water Heating System in an Office Building Through Simulation (사무소건물 태양열급탕시스템의 LCC 최적화 시뮬레이션)

  • Ko, Myeong-Jin;Choi, Doo-Sung;Chang, Jae-D.;Kim, Yong-Shik
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.12
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    • pp.859-866
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    • 2010
  • This study examined the economics of a solar water heating system for an office building using life cycle cost (LCC) optimization simulations. The numerical simulations were conducted with TRNSYS and GenOpt employing the Hooke-Jeeves algorithm. The solar collector area, slope, mass flow rate per collector area and storage tank volume were selected as the main design parameters of the solar water heating system. The LCC optimization simulations of the system were carried out for cases where water temperature was $60^{\circ}C$ and $50^{\circ}C$. The results showed that for water temperature at $60^{\circ}C$ and $50^{\circ}C$ the collector area could be decreased by 17% and 28%, storage tank volume could be decreased by 49% and 54%, and mass flow rate per collector area increased by 5% and 9% respectively compared to a non-optimized system. The LCC of the system was reduced by 4% for $60^{\circ}C$ and 7% for $50^{\circ}C$. The initial installation cost of the system was reduced by 24% for $60^{\circ}C$ and 34% for $50^{\circ}C$. However, the operating cost of the system increased by 16% for $60^{\circ}C$ and 36% for $50^{\circ}C$ compared to a traditional solar water heating system.

Effects of Minimizing the Heating Space on Energy Saving and Hot Pepper(Capsicum annuum L.) Growth in the Plastic Greenhouse (온실 난방공간 최소화가 에너지 절감 및 고추 생육에 미치는 영향)

  • Tae Young Kim;Young Hoe Woo;Ill Hwan Cho;Young Sam Kwon;Si Young Lee;Han Ik Jang
    • Journal of Bio-Environment Control
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    • v.10 no.4
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    • pp.213-218
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    • 2001
  • In 2000, domestic protected cultivation area was about 52,189 ha including 13,621 ha of heating greenhouses. Recently, heating cost accounts for 25 to 30% of total production cost which has been increased due to the rise of oil price, while the heating cost was about 15% in other advanced countries. To reduce the heating energy cost, the study of minimizing the heating space of greenhouse have been conducted from 1998 to 1999. The system was developed to control the heating space according to crop growth by moving horizontal curtain up and down. Installation of the heating space-control curtain in greenhouse decreased heating capacity to 264 m$^3$compared to 661.5 m$^3$in the traditional curtain, and consumpted fuel was saved about 56% point in semiforcing culture and 28% point in retarding culture of pepper. In addition, uniform distribution of air temperature and relative humidity in greenhouse environment resulted in earlier flowering and higher yields in hot pepper.

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Study on Energy Performance And Economic Evaluation of Windows System with Built-in Type Blinds (블라인드 내장형 창호시스템의 에너지 성능 및 경제성 평가에 관한 연구)

  • Joe, Won-Hwa;Lim, Nam-Gi
    • Journal of the Korea Institute of Building Construction
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    • v.10 no.2
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    • pp.97-104
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    • 2010
  • This study evaluated the energy efficiency of a windows system using built-in blinds, with regard to their insulation performance and their blocking of solar radiation. The study took advantage of the "Physibel Voltra" program as a physical simulation of heat transfer. To simulate the "Physibel Voltra" program, I practiced a mock-up test to determine heating quality and translation condition. I analyzed the propensity to annual energy consumption, the annual quantity of heat transfer, and the annual cooling and heating cost through a computer simulation for one general household in an apartment building. In the test, it was found that compared to a general windows system, a windows system with built-in blinds reduced the annual heat transfer by 10% in cooling states and by 11% in heating states when the blind was up. When the blind was down, the windows system with built-in blinds reduced the annual heat transfer by 25% in cooling states and 30% in heating states. When a windows system with built-in blinds is compared with a general windows system, the quantity of cooling and heating loads is reduced by 283.3kw in cooling states and 76.3kw in heating states. This leads to a reduction in the required cooling and heating energy of 359.6kw per house. It is thus judged that the use of a windows system with built-in blinds is advantageous in terms of reducing greenhouse gas emissions, because the annual TOE (tons of oil equivalent) per house is reduced by 0.078TOE, while $tCO_2$ is reduced by $0.16tCO_2$. In addition, compared with a general windows system, the cost of cooling and heating loads in the system reduces the annual cooling cost by 100,000won, and the annual heating cost by 50,000won. Ultimately, this means that cooling and heating loads are cut by 150,000won per year.

Cooling and Heating Energy Performance and Cost Analysis of Vertical Closed-loop Geothermal Heat Pump Coupled with Heat Storage Tank Compared to Conventional HVAC System (일반공조 시스템 대비 축열조와 연동된 수직밀폐형 지열히트펌프의 냉난방 에너지 성능 및 경제성 분석)

  • Kim, Min-Ji;Do, Sung-Lok;Choi, Jong-Min;Lee, Kwang Ho
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.11
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    • pp.81-87
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    • 2018
  • Among various types of geothermal heat pump systems, Vertical Closed-Loop Geothermal Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, the performance of VGSHP system coupled with heat storage tank was evaluated, by analyzing operational behavior of heat storage tank, the variations of heat pump energy performance due to the connection with heat storage tank, part load ratios characteristics of heat pump and the corresponding energy cost, compared to chiller and boiler based conventional system. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 18% for cooling and about 73% for heating, and annual heating/cooling energy cost reduction of 43,000,000 KRW ($ 39,000), compared to the conventional air conditioning system. In addition, after considering both energy cost and initial investment cost including equipment, installation and auxiliary device expenses, payback period of approximately 11.8 years was required.

Application study of heat storage type GSHP system in Apartment building with central cooling and heating facilities using life cycle cost analysis (LCC 분석을 이용한 중앙공급식 공동주택의 수축열식 지열원 히트펌프시스템의 적용연구)

  • Lee, Sang-Hoon;Park, Jong-Woo;Cho, Sung-Hwan
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1497-1502
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    • 2009
  • The present study has been conducted economic analysis of heat storage type ground source heat pump system(HSGSHP) and normal ground source heat pump (GSHP) and central boiler system with individual air conditioning facility which are installed at the same building in the shared an apartment house. Cost items, such as initial construction cost, annual energy cost and maintenance cost of each system are considered to analyze life cycle cost (LCC) and simple payback period (SPP) with initial cost different are compared. The initial cost is a rule to the Government basic unit cost of production. LCC applied present value method is used to assess economical profit of both of them. Variables used to LCC analysis are prices escalation rate and interest rate mean values of during latest 10 years. The LCC result shows that HSGSHP (1,351,000,000won) is more profitable than central boiler system with individual air conditioning facility by 86.7% initial cost. And SPP appeared 8.0 year overcome the different initial cost by different annual energy cost.

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PRELIMINARY DESIGN AND ECONOMICS CONSIDERATION OF P-NEW-CITY DISTRICT HEATING MAIN PIPES AND PUMPIG STATION (Flowra를 이용한 P신도시 지역난방 주 배관망 및 펌프장 예비 설계 및 경제성 검토)

  • Kim, Jin-Kwon
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.127-128
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    • 2010
  • As P-new-city is planned and constructed, district eating utilizing an existing near-by power plant's waste heat is considered as an economic and environment friendly way of providing heating to the new city. Many pipeline diameters and pumping station location and capacity were assumed, investigated and optimized, to satisfy the customers' heat demand considering common district heating pipe-network design and construction practice, and also and construction, pumping station land price and construction and the pumping energy cost during lifetime of DH systems.

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