• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.8
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• pp.803-809
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• 2012

It is necessary to predict the heating load in order to determine the optimal scheduling control of district heating systems. Heating loads are affected by many complex parameters, and therefore, it is necessary to develop an efficient, flexible, and easy to use prediction method for the heating load. In this study, simple specifications included in a building design document and the estimated temperature and humidity are used to predict the heating load on the next day. To validate the performance of the proposed method, heating load data measured from a benchmark district heating system are compared with the predicted results. The predicted outdoor temperature and humidity show a variation trend that agrees with the measured data. The predicted heating loads show good agreement with the measured hourly, daily, and monthly loads. During the heating period, the monthly load error was estimated to be 4.68%.

• Journal of Energy Engineering
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• v.25 no.3
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• pp.130-135
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• 2016

The thermal performance of amorphous steel fibers mixed floor heating system was evaluated. Analysis of results, depending on the hot water supply temperature changes, the average temperature of the bottom of the hot water supply temperature is an amorphous steel fiber floor heating system is about 2~4% higher. The average temperature of the floor surface to 1.5m air amorphous steel fiber system is 1~2% higher. The amount of heat supplied to indoor air (1.5m) from the bottom surface of amorphous steel fiber floor heating system is about 7~8% higher

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.182-185
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• 2015

IT 기술분야에서 IOT(Internet of Things) 는 현재 주목받는 기술 중 하나로서 여려 IT 분야에서 연구활동이 이루어지고 있는 추세이며 이로 인해 IT 기기 뿐만 아니라 일반 기기들과도 연결이 되어 빠른 시일 내에 사물인터넷 시대가 여릴 것으로 예측되고 있다. 본 논문에서는 이런 추세에 맞추어 스마트 홈네트워크 시스템에서는 가정내의 난방시스템에 대한 모니터링 및 자동온도측정 센서를 활용하여 적정온도 혹은 사용자의 활동 여부 등을 파악하여 설정된 온도보다 낮거나 높을 시에 자동으로 실내온도를 변경하고 나아가 원하는 가정내의 일부 부분만을 난방 할 수 있도록 자동화하는 방법에 대한 시스템 설계를 제안하고자 한다.

• The Magazine for Energy Service Companies
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• s.26
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• pp.26-27
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• 2004

당장 눈앞의 이익보다는 롯데기공이라는 기업의 브랜드 가치제고를 위하여 홍보에 주력하고 있습니다. 신규수요가 줄고 노후보일러 개체수요가 늘고 있는 현황에서 개별난방 뿐만 아니라 최적의 에너지시스템을 구축해주는 ESCO가 될 겁니다.

• Korean Chemical Engineering Research
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• v.50 no.3
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• pp.479-491
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• 2012

In this paper we performed evaluation of the economics of a district heating system (DHS) consisting of energy suppliers and consumers, heat generation and storage facilities and power transmission lines in the capital region, as well as identification of optimal operating conditions. The optimization problem is formulated as a mixed integer linear programming (MILP) problem where the objective is to minimize the overall operating cost of DHS while satisfying heat demand during 1 week and operating limits on DHS facilities. This paper also propose a new forecasting model of the system marginal price (SMP) using past data on power supply and demand as well as past cost data. In the optimization, both the forecasted SMP and actual SMP are used and the results are analyzed. The salient feature of the proposed approach is that it exhibits excellent predicting performance to give improved energy efficiency in the integrated DHS.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.55-56
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• 2006

냉매 충전량과 이차유체의 입구조건은 $CO_2$용 열펌프시스템의 성능실험에서 중요한 제어변수이다. 따라서, 열펌프사이클의 적용과 난방성능 향상을 위해 제어변수의 특성을 조사하는 것이 필요하다. 본 논문에서, $CO_2$용 열펌프 사이클의 성능 실험은 여러 가지 냉매 충전량에서 이차유체 입구조건에 변화를 주어 수행 되었다. 실험결과, 난방COP는 냉매 충전량이 증가함에 따라 1158g의 냉매 충전량에서 최대가 되었다가 감소하는 경향이 나타나며, 이는 COP가 최대가 되는 냉매충전량이 존재함을 나타낸다. 또한, 난방성능은 가스쿨러내 이차유체의 질량유량의 증가에 따라 증가하였다. 가스냉각기내 2차유체의 입구은도가 $10^{\circ}C$에서 $40^{\circ}C$로 증가하면, 난방용량, 압축일량, 토출압력은 각각 -8.57%, -35.89%, 32.78%로 변화했으며, 증발기 2차유체의 입구 온도가 감소하였을 때 난방COP는 감소하는 경향을 보였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.3
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• pp.698-701
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• 2017

The district heating system supports currently 1.3 million of houses in South Korea, and it is composed of two main parts: provision and distribution. For the provision part, Korea District Heating Corporation supervises the system with proper devices and experts, whereas for the distribution parts, there is no main supervision system and it depends highly on experts although it is very difficult to find the proper experts. In this paper, we consider IoT based remote management system for district heating distribution to properly supervise heating distribution by experts and/or programs remotely.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.5
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• pp.623-628
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• 2015

As the current heating control of the greenhouse is located in specifically designed place, there is an inevitable difference in degrees depending on the latitude in it. Even though it is necessary to maintain the proper temperature in the greenhouse producing vegetables and fruit plants, the difference between ups and downs in the facilities results in the increasing energy consumption to both warm and cool down the facilities. The newest heating method, automatic control system of vertical agitation heater, which manipulates the inner air circulation efficiently, is suggested in this paper. The proposed system utilizes both the upper temperature and the lower temperature, and controls the air circulation fan and heating independently, so that maximizes the efficiency of heating with the minimum energy and implements predictable planning of farm products.

• Solar Energy
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• v.17 no.1
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• pp.3-15
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• 1997

The goal of this paper is to measure and compare the performance of solar heat pump for school classroom heating. To accomplish the goal, solar heat pump with alumium roll bond type evaporator and indoor heat exchanger(condenser) was built and fully instrumented with thermocouples and pressure transducers etc. The test results showed that the COP and capacity of R-134a($CF_3CH_2F$) were higher than those of R-12($CF_2Cl_2$). The solar heat pump system for room heating was designed to show the best efficiency that the room temperature make $18{\sim}20^{\circ}C\;and\;23{\sim}25^{\circ}C$ in Seoul during November, December, and January.

• Journal of Energy Engineering
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• v.26 no.3
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• pp.113-122
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• 2017

The district heating system, which is the main axis of Korea's collective energy business, contributes to the national benefit and safety with the economical heat energy supply system.However, due to the uncertainty of management subjects and the shortage of professional technical personnel, there are many problems such as deterioration of thermal efficiency and unfairness of the price of the apartment houses. In this paper, we propose the monitoring points necessary for the efficiency and fault management of the district heating customer-side. And we propose a standard reference model to standardize it. We propose a technical methodology to improve the service quality and energy efficiency of the district heating facilities by applying IoT sensor technology, real-time monitoring and integrated management system.