earticle

영어

The thermal performance of surface water heat exchanger(SWHE) has been significantly influenced the system efficiency in the surface water source chiller(SWSC) and the heat pump system. In general, it is insufficiency because the material of submersible tube in SWHE such as the high density poly ethylene(HDPE) has low thermal conductivity as well as the tube have thicker HDPE. For the U value increasing in SWHE, 15A STS corrugated tube(CT, STS 0.25㎜), and 15A epoxy coating stainless steel corrugated tube(EPCT, STS 0.25㎜, epoxy coating 0.15㎜ for anti corrosion) apply to SWHE in SWSC system in this study. U value of CT, EPCT in SWHE will higher than the traditional HDPE tube because CT and EPCT consist of high thermal conductivity material such as STS, the thickness of epoxy coating layer is very tinny(0.15㎜), and the convection heat transfer rate of inner/outer layer is higher than the traditional HDPE tube. The purpose of this study is the verification of thermal performances about CT, EPCT in SWHE through the comparison of U values of two tubes and the traditional HDPE tube. U values of two tubes were experimentally obtained by the small SWSC system(1HP), the water chambers in the laboratory. U value of the traditional HDPE tube was obtained by the existing research. This study show that U values of CT(15A), EPCT(15A), the traditional HDPE tube(15A) were 35.657, 32.653, 7.101(W/K) per meter in the summer condition, respectively. As a result, if SWHE consist of the epoxy coating STS corrugated tube, the thermal performance will increase in the SWSC system. There is require that the additional experiment about the big diameter EPCT such as 25~32A apply to SWHE for the real building.

한국어

수중 열교환기의 성능은 수열원냉동기 및 히트펌프 효율에 큰 영향을 준다. 일반적으로 내식성과 관련하여 두껍고 열전도도가 낮은 고밀도폴리에틸렌(HDPE) 배관이 수중 열교환기에 적용됨에 따라 열성능이 충분치 못한 실정이다. 본 연구는 수중열교환기의 내식성을 확보하면서도 열교환 성능을 개선하기 위하여 에폭시도장 STS주름관을 제안하였다. 본 연구는 제안배관의 에너지성능 검증을 위하여 제안배관과 STS주름관 나관의 열관류율을 측정하였다. 15A 제안배관, 15A STS주름관, 16A HDPE배관의 열관류율은 35.657, 32.653, 7.101(W/K)로 각각 나타났다. 수중 열교환배관에 본 연구 제안배관을 적용할 경우 수열원냉동시스템의 에너지성능을 증진시킬 수 있을 것으로 본다. 향후 제안배관의 실제 적용에 관한 연구가 더 필요할 것으로 생각된다.