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Heating Performance Analysis of the Heat Pump System for Agricultural Facilities using the Waste Heat of the Thermal Power Plant as Heat Source

발전소 폐열을 이용한 농업시설용 히트펌프시스템의 난방 성능 분석

Youn Koo Kang1
,
Suk Won Kang2
,
Yee Paek2
,
Young Hwa Kim2
,
Jae Kyung Jang2
,
Young Sun Ryou2*
강 연구1
,
강 석원2
,
백 이2
,
김 영화2
,
장 재경2
,
유 영선2*
1Protected Horticulture Research Institute, NIHHS, RDA, Haman 52054, Korea
2Division of Energy & Environmental Engineering, NIAS, RDA, Jeonju 54875, Korea
1농촌진흥청 국립원예특작과학원 시설원예연구소
2농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과
*Corresponding author: ysryou@korea.kr
30 November 2017. pp. 317-323
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Abstract

In this study, the heating performance and the energy saving effect of the heat pump system using hot waste water(waste heat) of the thermal power plant discharged from a thermal power plant to the sea were analyzed. The greenhouse area was 5,280m2 and scale of the heat pump system was 120 RT(Refrigeration Ton), which was divided into 30 RT, 40 RT and 50 RT. The heat pump system consisted of the roll type heat exchangers, hot waste water transfer pipes, heat pumps(30, 40, 50 RT), a heat storage tank and fan coil units. The roll type heat exchangers was made of PE(Poly Ethylene) pipes in consideration of low cost and durability against corrosion, because hot waste water(sea water) is highly corrosive. And the heating period was 5 months from October to February. During the heating performance test(12 hours), the inlet water temperature of evaporator was changed from 32°C to 26°C, and heat absorption of he evaporator was changed from 175 kW to 120 kW. The inlet water temperature of the condenser rose linearly from 15°C to 50°C, and the heat release of condenser was reduced by 40 kW from 200 kW to 160 kW. And the power consumption of the heat pump system increased from 30 kW to 42 kW. When the inlet water temperature of condenser was 15°C, the heating COP(Coefficient Of Performance) was over 7.0. When it was 30°C, it dropped to 5.0, and when it was above 40°C, it decreased to less than 4.0. It was analyzed that the reduction of heating energy cost was 87% when compared to the duty free diesel that the carbon dioxide emission reduction effect was 62% by recycling the waste heat of the thermal power plant as a heat source of the heat pump system.

Keywords
Heat pump
Hot waste water
Thermal power plant
Waste heat

쓰레기 소각장이나 산업체의 폐열을 농업에 활용한 사 례는 몇몇 있었다. 그러나 온배수를 농업에 활용한 사례 는 전무하였으며, 치어, 종패 등을 양식하는 수산업이 대부분이었다.

본 연구에서는 화력발전소의 온배수(폐열)를 열원으로 이용하는 120 RT 규모의 냉난방시스템을 제주특별자치도 서귀포시 안덕면 소재의 5,280m2 아열대 작물(망고) 재배 온실에 설치, 10월에서 다음해 2월까지 약 5개월 동안 난 방을 실시하여 난방에너지 비용 절감 효과 등 분석하였다. 난방에너지 비용 절감효과는 면세경유에 대하여 87%이였 으며, 또한 발전소의 온배수를 에너지원으로 재활용함으로 서 62%의 이산화탄소 배출 저감 효과를 얻었다.

본 연구를 계기로 2015년에 해수가 수열에너지 분야로 재생에너지에 포함되었다. 해수의 표층의 열을 히트펌프 를 사용하여 변환시켜 얻은 에너지라는 수열에너지 분야 의 기준과 범위를 볼 때, 이는 온배수가 재생에너지에 포함되었다고 말해도 과언이 아닐 것으로 사료된다. 그 이유는 온배수도 해수임에도 불구하고 온도가 일반 해수 보다 7~8°C 높아, 일반 해수를 히트펌프의 열원으로 이 용하는 것보다 온배수를 열원으로 이용했을 때 히트펌프 의 성능이 높기 때문이다. 또한 같은 해 농식품부의 폐 열 재이용 시설 지원 사업이 발표되어, 발전소 온배수뿐 만 아니라 산업체와 소각장의 폐열을 농업에 활용하면 지원을 받을 수 있게 되었다.

이 사업에 의하여 2015년 당진시, 하동군, 제주시, 곡성 군이 선정되었으며, 2016년 태안군, 서귀포시 등이 선정되 어, 2016년 말 곡성군과 제주시가 공사를 완료, 농업에 폐 열을 활용하고 있으며(제주시는 발전소, 곡성군은 산업체 폐열을 이용하고 있음), 기타 지역은 추진 중이다.

키워드
온실
난방
이산화탄소
응축기
증발기
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 26
  • No :4
  • Pages :317-323
  • Received Date : 2017-07-24
  • Revised Date : 2017-09-20
  • Accepted Date : 2017-09-28
  • DOI :https://doi.org/10.12791/KSBEC.2017.26.4.317
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