• KEPCO Journal on Electric Power and Energy
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• 제8권2호
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• pp.69-72
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• 2022

This paper actually investigates the load on major large-scale buildings in the downtown area, examines the economic feasibility of installing PV and ESS in a microgrid target building, and evaluates whether an electric vehicle capable of V2G through two buildings is effective as an economical analysis program (HOMER) was analyzed using. It is economical to install a mixture of ESS rather than using the whole PV, and it is shown that if there is an electric vehicle using the V2G function of EV, there is an economic effect to replace the PV. So that Incentives and policies are needed to replace a large area of PV and utilize the existing parking lot to lead EV as a resource of the microgrid. Currently, P2X technology that stores power as ESS or converts it to other energy to control when surplus renewable energy occurs in large-capacity solar power plants and wind farms, etc. This is being applied, and efforts are being made to maintain the stability of the system through the management of surplus power, such as replacing thermal energy through a heat pump. Due to the increase in electric vehicles, which were recognized only as a means of transportation, technologies for using electric vehicles are developing. Accordingly, existing gas stations do not only supply traditional chemical fuels, but electricity, and super stations that also produce electricity have appeared. Super Station is a new concept power plant that can produce and store electricity using solar power, ESS, V2G, and P2G. To take advantage of this, research on an urban microgrid that forms an independent system by tying a large building and several buildings together and supplies power through a super station around the microgrid is in full swing.

• Journal of Advanced Marine Engineering and Technology
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• 제41권1호
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• pp.99-104
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• 2017

본 연구는 태양일사에 의하여 가열되는 온실상단에 고온의 태양잉여열을 축열조에 축열한 후 이를 이용하여 온실을 난방하는 히트펌프시스템의 실증연구에 관한 것으로 히트펌프시스템은 축열조를 구비하고, 각종 열교환을 위한 판형열교환기, 팬코일유닛 그리고 부가적인 에너지원으로 태양일사를 직접 집열할 수 있는 태양집열기로 구성되어 있다. 히트펌프시스템은 R410a냉매를 사용하며 일반적인 히트펌프시스템과 마찬가지로 외기열원만으로도 운전될 수 있으며, 온실내부의 설정온도에 따른 제어로직에 따라 외부조작없이 온실상단열의 축열운전, 외기공기에 의한 외기열원 및 축열조의 온수를 히트펌프의 작동 없이 난방하는 다수의 운전방식이 자동적으로 운전되도록 하였다. 개발된 축열식 히트펌프의 현장평가 성능실험을 위하여 제주시 조천리에 있는 $100m^2$ 크기의 온실에 설치하고 10월부터 12월까지 운전하였다. 실증연구 실험을 수행한 결과로써 외기열원을 이용하여 난방 할 경우 난방열량은 19.9 kW의 용량을 얻을 수 있었으며, 온실상단의 잉여열에 의하여 축열조의 온수로 히트펌프운전 없이 직접 난방 할 경우에 난방열량은 21.4 kW로 외기난방과 비슷한 난방용량을 나타내는 것을 알 수 있었다.