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강연구(Kang, Youn-Ku),유영선(Ryou, Young-Sun),김영화(Kim, Young-Hwa),성문석(Sung, Moon-Seok),김종구(Kim, Jong-Koo),장재경(Jang, Jae-Kyoung),이형모(Lee, Hyoung-Mo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The districts of underground geologic structure in Jeju island where underground air is distributed are lava cave, pyroclastic, open joint, and crushing zone. Such districts are identified to secure an enough airflow when air ventilation layer is to secure 25-35m in depth. In Jeju, Ground air is used for heating greenhouse and fertilizing natural CO₂ gas by suppling directly into greenhouse. But the heating method by suppling ground air into greenhouse directly bring about several problem. The occurrence of disease of the crops by high humidity is worried because the underground air which becomes discharge from underground air layer has over 90% relative humidity. The underground air is inadequate in heating for crops which need high temperature heating such as mangos, Hallbong and mandarin orange because the temperature of it is 15{sim}18?C. Also There is worry where the ventilation loss becomes larger because the air pressure inside greenhouse is high by supplying underground air directly. In this study the heat pump system using underground air as heat source was developed and heating performance of the system was analysed. Heating COP of the system was 2.5~5.0 and rejecting heat into greenhouse and extracting heat from underground air were 40,000~27,000 kcal/h, 30,000~18,000 kcal/h respectively.
수평형 지열히트펌프 시스템의 시설원예 냉난방 실증 효과
유영선(Ryou, Young-Sun),강연구(Kang, Youn-Ku),김영중(Kim, Young-Jung),강금춘(Kang, Keun-Chun) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Geothermal heat pump systems use the earth as a heat source in heating mode and a heat sink in cooling mode. These systems can be used for heating or cooling systems in farm facilities such as greenhouses for protected horticulture, cattle sheds, mushroom house and etc. A horizontal type means that a geothermal heat exchanger is laid in the trench buried in 1.2 to 1.8 m depth. Because a horizontal type has advantages of low installation, operation and maintenance costs compared to a vertical type, it is easy to be adopted to agriculture. In this study, to heat and cool farm facilities and obtain basic data for practical application of horizontal geothermal heat pump system in agriculture, a horizontal geothermal heat pump system of 10 RT was installed in greenhouse. Heating and cooling performance of this system was estimated. The horizontal geothermal heat pump used in this study had heating COP of 4.57 at soil temperature of 14?C with depth of 1.75m and heating COP of 3.75 at soil temperature of 7?C with the same depth. The cooling COP was 2.7 at ground temperature at 1.75m depth of 25.5?C and 2.0 at the temperature of 33.5?C.
문종필,이성현,권진경,강연구,유영선,이수장,Moon, Jong-Pil,Lee, Sung-Hyoun,Kwon, Jin-Kyung,Kang, Youn-Ku,Ryou, Young-Sun,Lee, Su-Jang 한국농공학회 2011 한국농공학회논문집 Vol.53 No.6
In order to heat greenhouse nearby river channel, riverbank filtration water source heat pump was developed for getting plenty of heat flux from geothermal energy. Recharging well, thermal storage tank with separating insulation plate and filtering tank for eliminating iron, manganese were mainly developed for making the coefficient of performance (COP) of heat pump higher. Heating system using riverbank filtration water source heat pump was installed at a paprika greenhouse in the Jinju region where a single fold of vinyl cover and 2 layers of horizontal thermal curtain were installed as a part of temperature keeping and heat insulation with a greenhouse area of 3,185 $m^2$. 320,000 kcal/h was supplied for performing a site application tests. A greenhouse heating test was performed from Feb. 1, 2011 to Apr. 30, 2011. As the result of that, COPh of the heat pump was measured in the range of 4.0~4.5, while COPS of the system was represented as 2.9~3.3. COP measured of the heat pump was very good and well responded to indoor heating temperature of the environment control system of a greenhouse.
화력발전소의 온배수를 열원으로 이용하는 시설원예 난방용 히트펌프 시스템의 열교환기 설계기준 설정
유영선(Young Sun Ryou),강연구(Youn Ku Kang),장재경(Jae Kyung Jang),김영화(Young Hwa Kim),김종구(Jong Goo Kim),강금춘(Geum Chun Kang) (사)한국생물환경조절학회 2012 생물환경조절학회지 Vol.21 No.4
본 연구에서는 화력발전소에서 온배수의 형태로 배출되는 폐열을 히트펌프의 열원으로 이용하여 온실의 난방에 활용할 수 있는 히트펌프 시스템을 설계 제작하였으며, 난방 성능을 분석하여 PE 파이프 열교환기의 설계기준을 제시하고자 하였다. PE 파이프 열교환기의 내경은 20㎜, 두께는 2㎜였으며, Roll의 직경은 1,000㎜로 하였다. 연구결과 PE파이프 열교환기의 적정 길이는 1.0RT당 75m로 설계하는 것이 바람직할 것으로 판단되었으며, 이때 히트펌프시스템의 난방성능계수(COPh)는 3.8로 나타났다. This study was carried out in order to determine the optimum length of a roll type PE pipe heat exchanger employed in the water-to-water heat pump system using the waste heat of the heated effluent flowed out from thermal power generation plants as a heat source. And the heat pump system of 30 RT for an experimental test was designed and manufactured. And also PE pipes were employed to recover the waste heat from the heated effluent. The inside diameter of PE pipe heat exchanger was 20 ㎜, the thickness was 2 ㎜ and the diameter of a roll was 1,000 ㎜. And from the results of this study, we found that the optimum length of PE pipe heat exchanger was 75 m per the heat pump capacity of 1.0 RT (3.51 ㎾) and then the heating COP of heat pump system was 3.8.
김승희 ( Seoung Hee Kim ),강연구 ( Youn Ku Kang ),문종필 ( Jong Pil Moon ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
여름철 온실 창을 개방하여도 시설 내부 온도가 35°C 이상으로 상승되어 작물 생육이 나빠질 뿐만 아니라 품질이 저하되어 작물 생산이 곤란하다. 이와 같은 고온기에 작물재배를 위하여 원예시설의 냉방 수요가 지속적으로 증가하고 있으나, 냉방기나 히트펌프 등과 같은 공조시설을 사용하여 시설 내부의 온도를 낮추기에는 냉방 비용이 커져 생산비용이 증가하게 된다. 따라서 간접냉방 방식의 하나인 포그 시설을 이용하게 되면 생산비용 면에서나 냉방효과 면에서도 유리하여 농가에서 선호하고 있다. 그러나 포그는 온도하강 효과는 좋으나 과하게 사용하면 온실 내부가 과습되어 더 이상 온도강하가 일어나지 않으며 심하면 작물에 병해 발생을 유도하게 된다. 이에 본 연구에서는 포그 분무장치와 온실 내 습도를 배출하기 위해 강제환기장치인 유동팬과 배기팬을 연동시킬 수 있도록 제어기를 제작하여 냉방효과를 높이고자 하였다. 단동 온실에서 시험결과, 외기 온도가 약 33°C에서도 포그 냉방하지 않고 차광 50%한 대조온실에서 내부 온도는 40°C를 넘는 것으로 측정되었으며, 포그 냉방을 하는 경우 온실 내부 온도가 외기 온도와 같은 수준으로 떨어지는 것으로 나타났다. 연동 온실에서 한낮(12:00~15:00) 동안 외기습도가 55% 이상이었던 날(2018.8.28.)에 포그 냉방한 시험구에서 외기보다 높은 것으로 측정되어 습도가 높게 되면 냉방효과가 떨어지는 것으로 나타났고, 외기습도가 높지 않은 날에 있어서는 포그 냉방 시 온실 내부 온도는 외기 온도의 수준으로 낮아지는 것으로 나타났다.