며칠뒤면 kimin87   15-01-23 12:42 글이 안써져셔 댓글로 질문드립니다... 죄송합니다. 다름이 아니라 Shell and Tube 열교환기에서 Tube Side에는 HP steam을 사용합니다. 이때 전단 Desuperheater를 통해 과포화된 증기가 포화증기로 바뀌어 들어가는 경우에 혹시 Desuperheater에서 스팀을 효과적으로 감소(?)시키지 못해 과포화 증기(배관의 길이를 고려한 살짝 높은 정도 이상으로)가 열교환기로 유입된다면 어떻게 될까요? 그냥 효율이 떨어진다 말고 좀 디테일하게 설명을 들을 수 있을까요? 추가 질문입니다. 열교환기의 크기 (전열면적)이 넓을수록 Steam 사용량이 적어질 것이라는 것은 생각해 볼 수 있겠는데요. 혹시 전열면적을 계속적으로 키우면 어느순간 더이상 효율이 좋아지지 않는 점이 나올 수 있을 것 같은데... 일반적인 Q=UA LMTD식으로 계산할때 Q와 총괄 열전달 계수 U가 고정된 상태에서 A가 커짐에 따라 LMTD가 작아지는 식으로 구하게되면.. 안될 것 같은데 그 Limit를 알 수 있는 방법이 있나요? 그라고 열교환기라 함은 두 유체를 간접적으로 (혹은 직접적으로) 접촉시켜 두개의 열을 교환시키는 것인데.. 혹시 두 유체의 온도가 같아 질 수 (Tube Out and Shell Out)있나요?? 관련 식이나 이론을 찾아보는데.. 인터넷에서는 굉장히 찾기 어렵습니다.. 대학 다닐때는 도서관에서 열교환기관련 서적을 찾으면 잔뜩 나와서 그것좀 뒤져보면 궁금한 점을 다 찾았는데... 회사에서는 그게 쉽지 않네요.. 추천 서적좀 부탁드립니다.. 항상 감사합니다. 큰 도움 받고있습니다. 글이 안써져셔 댓글로 질문드립니다... 죄송합니다. 다름이 아니라 Shell and Tube 열교환기에서 Tube Side에는 HP steam을 사용합니다. 이때 전단 Desuperheater를 통해 과포화된 증기가 포화증기로 바뀌어 들어가는 경우에 혹시 Desuperheater에서 스팀을 효과적으로 감소(?)시키지 못해 과포화 증기(배관의 길이를 고려한 살짝 높은 정도 이상으로)가 열교환기로 유입된다면 어떻게 될까요? 그냥 효율이 떨어진다 말고 좀 디테일하게 설명을 들을 수 있을까요? 추가 질문입니다. 열교환기의 크기 (전열면적)이 넓을수록 Steam 사용량이 적어질 것이라는 것은 생각해 볼 수 있겠는데요. 혹시 전열면적을 계속적으로 키우면 어느순간 더이상 효율이 좋아지지 않는 점이 나올 수 있을 것 같은데... 일반적인 Q=UA LMTD식으로 계산할때 Q와 총괄 열전달 계수 U가 고정된 상태에서 A가 커짐에 따라 LMTD가 작아지는 식으로 구하게되면.. 안될 것 같은데 그 Limit를 알 수 있는 방법이 있나요? 그라고 열교환기라 함은 두 유체를 간접적으로 (혹은 직접적으로) 접촉시켜 두개의 열을 교환시키는 것인데.. 혹시 두 유체의 온도가 같아 질 수 (Tube Out and Shell Out)있나요?? 관련 식이나 이론을 찾아보는데.. 인터넷에서는 굉장히 찾기 어렵습니다.. 대학 다닐때는 도서관에서 열교환기관련 서적을 찾으면 잔뜩 나와서 그것좀 뒤져보면 궁금한 점을 다 찾았는데... 회사에서는 그게 쉽지 않네요.. 추천 서적좀 부탁드립니다.. 항상 감사합니다. 큰 도움 받고있습니다.

스테파노 Stefano   15-01-23 21:13 (0) 첫 게시판 글이 써지지 않는 이유는 아마 Internet Explorer가 아닌 다른 브라우저에서 접속하여 이곳에 들어왔을 때 일어나는 현상이 아닌가 판단하고 있습니다.  혹시 구글 크롬을 사용하는 것은 아닌지? (00) 질문시 내용별로 번호를 매겨두면 답변이 용이할 것이므로 다음부터 그리해 보도록 하세요. (1) "과포화 증기".. 라는 표현을 쓰고 있는데 내용을 들여다 보면 "과열증기"가 맞습니다.  과열증기를 사용하면 열교환기 입구에서의 열전달계수가 떨어져서 열교환기의 성능이 나오지 않을 수가 있습니다.  결과적으로 효율이 떨어지는 셈이 되지요.  전열계수가 이 떨어지는 이유는 Gas와 Vapor의 열전달 계수의 차이입니다.  공기나 질소 등과 같은 기체의 열전달계수는 수증기가 바로 응축하고 있을 때의 열전달계수의 약 1/100 ~1/200 정도로 아주 큰 차이를 보입니다.  과열증기는 스팀에 미응축가스인 공기가 들어가는 효과를 나타내기 때문에 전열계수가 크게 떨어지는 것이지요.  겨울철 래디에타에 공기가 들어있다며 열방사가 잘 안되는 현상이 나타나는데 내부에 들어있는 공기를 빼주면 스팀이 잘 응축되면서 열방사가 잘되는 효과와 완전히 일치하는 현상입니다.  결국, 전열계수가 떨어지면 열교환기의 성능이 제대로 안나오기 때문에 효율이 떨어지게 됩니다. (2) 열부하Q가 고정되어 있는 상태에서 U도 고정된 다면 전열면적과 LMTD는 반비례의 관계가 성립합니다.  Q/U=A*LMTD......(1)  이를 말로 설명하면 LMTD가 크면 필요한 면적이 줄어들고 작으면 늘어나고... 공자의 말씀입니다.  Limit는 A* LMTD값이 항상 Q/U에 접근한다는 것입니다.  LMTD가 0에 접근하면 면적은 늘어나는데 무한 면적이 늘게되어 유량이 되면 실제로 U값이 제대로 나오지 않을 수가 있습니다.  이 점을 찾기는 어려운 일이겠으나 하여간 U값이 떨어지는 점은 나타날 것입니다.  (3)입출구에서의 고온측과 저온측의 온도차를 Approach라고 하는데 완전 Counter Flow인 경우 고온측의 출구온도가 저온측의 출구온도보다 낮아질 수 있습니다.  질문에서는 Parallel Flow일 때 고온측과 저온측의 온도가 같아질 수 없는가에 관한 질문인데 이에  대한 답은 전열면적이 무한하지 않으면 "절대로 같아질 수 없다"가 정답입니다.  Shell & Tube 열교환기에서 Parallel Flow의 일반적인 Approach 한도는 3도가 한계수치로 봅니다.  (Plate & Frame 열교환기에서는 2도정도로 추정하는데 이에대한 지식을 알고 계신분이 추가답글을 올려주세요. ) (4) 직장에 책이 없다니.... 문제가 있으면 개선해야하지요.  책을 구해다 비치해 두고 함께 나누어 보면 되지 않을까요? 열교환기 서적은 인터넷에서 쉽게 구할 수 있습니다.  헌책도 팔고 있지요.  그러나 우리나라에서는 책방에서조차 열교환기 관련 서적을 구하기 힘듭니다.  헌책을 여러권 선택하여 어느정도 금액(150불?)을 초과하면 우송료가 무료입니다.  여러분야의 책을 몇권 더 선택해서 구입해 보세요.  운좋게 노벨수상자가 보았던 책이 걸려들 수도 있지 않을까요?    http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Heat+Exchanger+Design+Handbook&rh=i%3Aaps%2Ck%3AHeat+Exchanger+Design+Handbook (0) 첫 게시판 글이 써지지 않는 이유는 아마 Internet Explorer가 아닌 다른 브라우저에서 접속하여 이곳에 들어왔을 때 일어나는 현상이 아닌가 판단하고 있습니다. 혹시 구글 크롬을 사용하는 것은 아닌지? (00) 질문시 내용별로 번호를 매겨두면 답변이 용이할 것이므로 다음부터 그리해 보도록 하세요. (1) "과포화 증기".. 라는 표현을 쓰고 있는데 내용을 들여다 보면 "과열증기"가 맞습니다. 과열증기를 사용하면 열교환기 입구에서의 열전달계수가 떨어져서 열교환기의 성능이 나오지 않을 수가 있습니다. 결과적으로 효율이 떨어지는 셈이 되지요. 전열계수가 이 떨어지는 이유는 Gas와 Vapor의 열전달 계수의 차이입니다. 공기나 질소 등과 같은 기체의 열전달계수는 수증기가 바로 응축하고 있을 때의 열전달계수의 약 1/100 ~1/200 정도로 아주 큰 차이를 보입니다. 과열증기는 스팀에 미응축가스인 공기가 들어가는 효과를 나타내기 때문에 전열계수가 크게 떨어지는 것이지요. 겨울철 래디에타에 공기가 들어있다며 열방사가 잘 안되는 현상이 나타나는데 내부에 들어있는 공기를 빼주면 스팀이 잘 응축되면서 열방사가 잘되는 효과와 완전히 일치하는 현상입니다. 결국, 전열계수가 떨어지면 열교환기의 성능이 제대로 안나오기 때문에 효율이 떨어지게 됩니다. (2) 열부하Q가 고정되어 있는 상태에서 U도 고정된 다면 전열면적과 LMTD는 반비례의 관계가 성립합니다. Q/U=A*LMTD......(1) 이를 말로 설명하면 LMTD가 크면 필요한 면적이 줄어들고 작으면 늘어나고... 공자의 말씀입니다. Limit는 A* LMTD값이 항상 Q/U에 접근한다는 것입니다. LMTD가 0에 접근하면 면적은 늘어나는데 무한 면적이 늘게되어 유량이 되면 실제로 U값이 제대로 나오지 않을 수가 있습니다. 이 점을 찾기는 어려운 일이겠으나 하여간 U값이 떨어지는 점은 나타날 것입니다. (3)입출구에서의 고온측과 저온측의 온도차를 Approach라고 하는데 완전 Counter Flow인 경우 고온측의 출구온도가 저온측의 출구온도보다 낮아질 수 있습니다. 질문에서는 Parallel Flow일 때 고온측과 저온측의 온도가 같아질 수 없는가에 관한 질문인데 이에 대한 답은 전열면적이 무한하지 않으면 "절대로 같아질 수 없다"가 정답입니다. Shell & Tube 열교환기에서 Parallel Flow의 일반적인 Approach 한도는 3도가 한계수치로 봅니다. (Plate & Frame 열교환기에서는 2도정도로 추정하는데 이에대한 지식을 알고 계신분이 추가답글을 올려주세요. ) (4) 직장에 책이 없다니.... 문제가 있으면 개선해야하지요. 책을 구해다 비치해 두고 함께 나누어 보면 되지 않을까요? 열교환기 서적은 인터넷에서 쉽게 구할 수 있습니다. 헌책도 팔고 있지요. 그러나 우리나라에서는 책방에서조차 열교환기 관련 서적을 구하기 힘듭니다. 헌책을 여러권 선택하여 어느정도 금액(150불?)을 초과하면 우송료가 무료입니다. 여러분야의 책을 몇권 더 선택해서 구입해 보세요. 운좋게 노벨수상자가 보았던 책이 걸려들 수도 있지 않을까요? http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Heat+Exchanger+Design+Handbook&rh=i%3Aaps%2Ck%3AHeat+Exchanger+Design+Handbook

며칠뒤면 kimin87   15-01-29 03:32 답변 감사드립니다. 답변에 대한 질문이 있어 질문드립니다. (3)에서 완전 Counter flow라는 것은 무엇을 의미하는 것 입니까? 공장에서 흔히 사용하는 Shell & Tube 타입의 열 교환기는 Parallel flow인건가요? 일반적으로는 Shell & Tube 타입 내부에서 두 flow가 얽혀 Counter flow로 접촉하는 것 아닌가요? 추가적으로 여쭙고 싶은 것이 Q=U A LMTD의 식을 Counter flow에 적용할 때.. 혹시 Hot Outlet이 Cold Outlet보다 온도가 낮아진다면 식이 어떻게 되는지 알고싶습니다. 혹 온도가 같아 LMTD가 0이 된다면 식이 어떻게 되는 것이죠? 항상 감사드립니다. 답변 감사드립니다. 답변에 대한 질문이 있어 질문드립니다. (3)에서 완전 Counter flow라는 것은 무엇을 의미하는 것 입니까? 공장에서 흔히 사용하는 Shell & Tube 타입의 열 교환기는 Parallel flow인건가요? 일반적으로는 Shell & Tube 타입 내부에서 두 flow가 얽혀 Counter flow로 접촉하는 것 아닌가요? 추가적으로 여쭙고 싶은 것이 Q=U A LMTD의 식을 Counter flow에 적용할 때.. 혹시 Hot Outlet이 Cold Outlet보다 온도가 낮아진다면 식이 어떻게 되는지 알고싶습니다. 혹 온도가 같아 LMTD가 0이 된다면 식이 어떻게 되는 것이죠? 항상 감사드립니다.

스테파노 Stefano   15-02-01 06:35 (1) Counter Flow는 Parallel  Flow와 대칭되는 말입니다.  Shell & Tube에서 Counter Flow가 되려면 Tube Side나 Shell Side 모두 1개의 Pass로 되어 있고 서로 마주 보는 방향에서 흐르도록 만들어진 열교환기가 되어야 합니다.  서로 마주보는 흐름방향이라면 두사람이 다리를 건널때 서로 반대방향에서 건너가는 방식이 Counter Flow 방향이고 둘이서 한쪽에서 다른 쪽으로 나란히 가는 방향은  Parallel Flow 방향입니다.    (2) Counter Flow인 경우 Hot Outlet이 Cold Outlet보다 온도가 낮아질 수도 있기 때문에  Q=U A LMTD를 계산할 때 열교환기의 양 끝에서 온도차로부터 LMTD를 계사하면 됩니다.  이쪽 끝 온도차와 다른 똑 끝 온도차가 같을 경우 LMTD로 계산할 수 없으며 단순 평균값으로 계산하면 됩니다. (1) Counter Flow는 Parallel Flow와 대칭되는 말입니다. Shell & Tube에서 Counter Flow가 되려면 Tube Side나 Shell Side 모두 1개의 Pass로 되어 있고 서로 마주 보는 방향에서 흐르도록 만들어진 열교환기가 되어야 합니다. 서로 마주보는 흐름방향이라면 두사람이 다리를 건널때 서로 반대방향에서 건너가는 방식이 Counter Flow 방향이고 둘이서 한쪽에서 다른 쪽으로 나란히 가는 방향은 Parallel Flow 방향입니다. (2) Counter Flow인 경우 Hot Outlet이 Cold Outlet보다 온도가 낮아질 수도 있기 때문에 Q=U A LMTD를 계산할 때 열교환기의 양 끝에서 온도차로부터 LMTD를 계사하면 됩니다. 이쪽 끝 온도차와 다른 똑 끝 온도차가 같을 경우 LMTD로 계산할 수 없으며 단순 평균값으로 계산하면 됩니다.

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