태양광열 복합 시스템의 연구개발 동향 분석

김진희,이현주,양연원,김준태 대한건축학회지회연합회 2006 대한건축학회지회연합회 학술발표대회논문집 Vol.2 No.1

태양광열 복합 시스템은 건물에 필요한 열원과 전기를 동시에 생산하는 시스템이다. 이러한 시스템은 PV 패널 후면의 열을 제거하여 PV 모듈의 효율을 극대화하고 이 폐열을 이용하여 건물 난방에 이용하는 복합적인 기능을 수행하는 시스템으로 활용하는 것이 중요하다. 본 연구에서는 태양광과 태양열을 동시에 활용한 태양광열 복합시스템에 대해 알아보고, 이와 관련된 국내외 연구동향에 대해 살펴보았다. 따라서 국내에 태양광열 복합시스템을 건물난방에 적용하기 위한 기초 연구자료로 활용하고자 한다. Photovoltaic-solar thermal combined system produces electricity and thermal energy which are necessary to buildings. The system removes heat from the PV module that would help to raise the efficiency of the PV system's performance. It is useful to utilize the waste heat for building space heating as this multi-functional application of solar energy system will improve the viability of the system. This paper describes research and development trends of PV-solar thermal combined systems. It is believed that this analysis will provide valuable source of information about the PV-solar thermal combined system to apply into building space heating.

태양열 축열조가 없는 변유량 제어 방식의 지역난방용 태양열시스템 실증시험연구

백남춘(Baek Nam-Choon),신우철(Shin U-Chul),이진국(Lee Jin-Kook),유응상(Yoon Eung-Sang),윤석만(Yoon Suk-man) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.5

In this study, the design of the solar heating system for district heating as well as it's operating characteristics and the performance analysis was carried out. This solar district heating system was composed of two different types of solar collector circuit, flat plate and vacuum tube solar collector, in a system. This system supply constant temperature of hot water without solar buffer tank. For this, the proportional(variable flow rate) control was used. The experimental facility for this study was used the Bundang district solar heating system which was installed in the end of 2006. The operating characteristics and behaviour of each collector circuits are investigated especially for the system design and control. The yearly solar thermal efficiency is 47.5% on the basis of aperture area and 39.8% on the basis of gross area of collector. As a result this solar heating system without solar buffer tank and with proportional controller was testified a very effective and simplified system for district heating. It varied especially depend on the weather condition like as solar radiation and ambient temperature.

태양열 냉ㆍ난방 및 급탕 시스템 열성능

곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin),이호(Lee Ho) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-

This paper presents demonstration study results derived through field testing of a solar assisted cooling and heating system for the library of a cultural center building located in Gwangju, Korea. The area of demanded cooling and heating for building was about 350㎡. Solar hot water was delivered by means of a 200㎡ array of evacuated tubular solar collector (ETSC) to drive a single-effect (LiBr/H2O) absorption chiller of 10RT nominal cooling capacity. From March in 2008 to February in 2009, demonstration test were performed for solar cooling and heating system. After experiments and analysis, this study found that solar thermal system was 84% for the solar hot water supply and 12% for space heating and 4% for space cooling.

지역난방 적용 태양열시스템의 장기 열성능 분석

백남춘(Baek Nam-Choon),신우철(Shin U-Cheul) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4

This study analyzed by simulation using TRNSYS as well as by experiment on the solar district heating system installed for the first time for the district heating system in Bundang. Simulation analysis using TRNSYS focused on the thermal behavior and long-term thermal efficiency of solar system. Experiment carried out for the reliability of simulation system. This solar system where the circuits of two different collectors, flat plate and vacuum tube collector, are connected in series by a collector heat exchanger, and the collection characteristics of each circuit varies. Therefore, these differences must be considered for the system's control. This system uses variable flow rate control in order to obtain always setting temperature of hot water by solar system. Specifically, this is a system that heats returning district heating water (DHW) at approximately 60℃ using a solar collector without a storage tank, up to the setting temperature of approximately 85~95℃ To realize this, a flat plate collector and a vacuum tube collector are used as separate collector loops. The first heating is performed by a flat plate collector loop and the second by a vacuum tube collector loop. In a gross collector area basis, the mean system efficiency, for 4 years, of a flat plate collector is 33.4% and a vacuum tube collector is 41.2%. The yearly total collection energy is 2,342GJ and yearly collection energy per unit area (㎡) is 1.92GJ and 2.37GJ respectively for the flat plate vacuum tube collector. This result is very important on the share of each collector area in this type of solar district heating system.

온수 급탕 및 난방을 위한 히트 펌프 태양열 시스템의 성능 분석

손진국(Sohn Jin-Gug) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.5

This study aims to analyze the performance of solar thermal system with heat pump for domestic hot water and heat supply. There are four types of system. Systems are categorized based on the existence of a heat pump and the ways of controlling the working fluid circulating from the collector. Working fluid is controlled by either temperature level (categorized as system 1 and 2) or sequential flow (system 3 and 4). Heat balance of the system, the solar fraction, hot water and heating supply rates, and performance of heat pump are analyzed using TRNSYS and TESS component programs. Technical specifications of the main facilities are as follow; the area of the collector to 25 ㎡, the volumes of the main tank and the buffer tank to 0.5 ㎥ and 0.8 ㎥, respectively. Heating capacity of the heat pump in the heating mode is set to 30,000 kJ / hr. Hot water supply set 65 liters per person each day, total heat transfer coefficient of the building to 1,500 kJ / kg.K. Indoor temperature is kept steadily around 22℃. The results are as follows; 6 months average solar fraction of system 1 turns out to be 39%, which is 6.7% higher than system 2 without the heat pump, indicating a 25% increase of solar fraction compared to that of system 2. In addition, the solar fraction of system 1 is 2% higher than that of system 3. Hot water and heating supply rate of system 1 are 93% and 35%, respectively. Considering the heat balance of the system, higher heat efficiency, and solar fraction, as whole, it can be concluded that system 1 is the most suitable system for hot water and heat supply.

태양열 시설원예 난방시스템 장기실증 성능분석 연구

이상남(Lee, Sang-Nam),강용혁(Kang, Yong-Heack),유창균(Yu, Chang-Kyun),김진수(Kim, Jin-Soo) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.2

Objective of the research is to demonstrate solar thermal space and ground heating system which is integrated to a green-house culture facility for reducing healing cost, Increasing the value of product by environment control, and developing advanced culture technology by deploying solar thermal system. Field test for the demonstration was carried out in horticulture complex In Jeju Island. Medium scale solar hot water system was installed in a ground heating culture facility. Reliability and economic aspect of the system which was operated complementary with thermal storage and solar hot water generation were analyzed by investigating collector efficiency, operation performance, and control features. Short term day test on element performance and Long term test of the whole system were carried out. Optimum operating condition and its characteristics were closely Investigated by changing the control condition based on the temperature difference which Is the most important operating parameter For establishing more reliable and optimal design data regarding system scale and operation condition, continuous operation and monitoring on the system need to be further carried out. However, It is expected that, in high-insolation areas where large-scale ground storage is adaptable, solar system demonstrated in the research could be economically competitive and promisingly disseminate over various application areas.

태양열 시스템의 제어조건에 따른 난방 및 급탕 실증연구

곽희열(Kwak Hee-Youl),김정배(Kim Jeong-Bae),주홍진(Joo Hong-Jin),김종보(Kim Jong-Bo) 한국태양에너지학회 2006 한국태양에너지학회 논문집 Vol.26 No.4

This study describes thermal performance of heating and cooling demonstration system using ETSC(Evacuated tubular solar collector) installed at Seo-gu art center of Kwangju. For demonstration study, a reading room with about 350㎡ was heated and cooled using that system. The demonstration system was consisted of ETSCs, storage tank, hot water supply tank, subsidiary boiler, and subsidiary tank. From January to March in 2006, demonstration test were performed with 4 control mode to find the optimum control condition for solar thermal system. After experiments and analysis, this study found that solar thermal system of control mode IV was corresponded to 78% for the hot water supply and 49% for space heating.

태양열 냉ㆍ난방시스템의 열성능 분석

곽희열(Kwak Hee-Youl),신우철(Shin U-Cheul) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.4

The purpose of this study is to present the simulation results and an overview of the performance assessment of a solar heating & cooling system by means of the 200㎡ evacuated tube solar collector. The simulation was carried out using the thermal simulation code TRNSYS with new model of a single-effect LiBr/H₂O absorption chiller developed by this study. The calculation was performed for yearly long-term thermal performance and for two design factors: the solar hot water storage tank and the cold water storage tank. As a result, it was anticipated that the yearly mean system efficiency is 46.7% and the solar fraction for the heating, cooling and hot water supply are about 84.4 %, 41.7% and 72.4%, respectively.

지역난방 태양열시스템의 열성능 해석 프로그램 개발

백남춘(Baek Nam-Choon),신우철(Shin U-Cheul) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.6

In this study the thermal performance and economic analysis program of solar heating system for district heating was developed. This program, named SOLAN-DHS and based on TRNSYS, consisted of four modules like as user's interface for system input/output, library, and utilities and a calculating engine. SOLAN- DHS simplifies user's input data through the database of most system engineering data including weather data of 17 areas in Korea. Five different types of solar systems which can be applicable to district heating system were presented in this program. Due to the user-friendly layout, all design parameters can be changed quickly and easily for the influence on system efficiency. The reliability of SOLAN-DHS was finally verified by the experiments.

Study on the Operation of the Solar Heating System with Ground Source Heat Pump as a Back-up Device

김휘동(Kim, Hwidong),백남춘(Baek, Namchoon),이진국(Lee, Jinkook),신우철(Shin, Uchul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06

The study on the operation characteristics of solar space and water heating system with ground source heat pump (GSHP) as a back-up device was carried out. This system, called solar thermal and geothermal hybrid system (ST/G), was installed at Zero Energy Solar House II (KIER ZeSH-II) in Korea Institute of Energy Research. This ST/G hybrid system was developed to supply all thermal load in a house by renewable energy. The purpose of this study is to find out that this system is optimized and operated normally for the heating load of ZeSH-II. Experiment was continued for seven months, from October to April. The analysis was conducted as followings ; - the contribution of solar thermal system. - the appropriateness of GSHP as a back-up device. - the performance of solar thermal and ground source heat pump system respectively. - the adaptation of thermal peak load - the operation characteristics of hybrid system under different weather conditions. Finally the complementary measures for the system simplification was referred for the commercialization of this hybrid system.