Helical Coil He[1]

Please download to get full document.

View again

of 4
4 views
DOC
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Document Description
helical coil heat exchanger
Document Share
Documents Related
Document Tags
Document Transcript
  HELICAL COIL HEAT EXCHANGER INTRODUCTION A heat exchanger  is a device used to transfer heat between a soid ob!ect and a fluid or between two or #ore $uids% The $uids #a& be se'arated b& a soid wato 'revent #i(in) or the& #a& be in direct contact% The cassic e(a#'e of a heat e(chan)er is found in an internal combustion engine     in which a circua*n) $uid +nown as engine coolant     $ows throu)h radiator   cois and air   $ows 'ast the cois which coos the cooant and heats the inco#in)  air  % Helical coil heat exchangers have been used in the nuclear industry as a method for exchanging heat in a sodium system for large liquid metal fast breeder reactors since the early 1970s, using an HCHE device invented by Charles E. oardman and !ohn H. ermer. #here are several sim$le methods for designing HCHE for all ty$es of manufacturing industries, such as using the %amachandra &.'atil (et al.) method from *ndia and the +cott +. Haraburda method from the nited +tates. HCHE wi be the best choice in case of foowin) cases, 1.#he main advantage of the HCHE, li-e that for the +HE, is its highly efficientuse of s$ace, es$ecially hen it/s limited and not enough straight $i$e can be laid..nder conditions of lo florates (or laminar flo), such that the ty$ical shellandtube exchangers have lo heattransfer coefficients and becominguneconomical.2.3hen there is lo $ressure in one of the fluids, usually from accumulated $ressure dro$s in other $rocess equi$ment. 405 6.3hen one of the fluids has com$onents in multi$le $hases (solids, liquids, and gases), hich tends to create mechanical $roblems during o$erations, such as  $lugging of smalldiameter tubes. Cleaning of helical coils for these multi$le$hasefluids can $rove to be more difficult than its shell and tube counter$art hoever the helical coil unit ould require cleaning less often GEO-ETR. O/ HELICAL COIL0  The sche#a*c dia)ra# shows di#ensiona and o'era*n) 'ara#eters of heica coi heat e(chan)er%  /i)12, 0che#a*c of she and heica coi 3% EX4ERI-ENTAL 4ROCEDUREThe sche#a*c dia)ra# of the e('eri#enta set u' is as shown in /i)%5% The e('eri#enta set u' consists of a she in which the heica coi co''er tube is 'aced throu)h which hot water is #ade to $ow with the he' of a centrifu)a 'u#'% To ensure #a(i#u# heat transfer the co''er heica coi is fu& i##ersed in the cod water $owin) throu)h the she the inet and outet are so 'aced as shown in /i)% 2%The she is we insuated so as to avoid the heat oss to the surroundin)% The #ain co#'onents in the set u' incude centrifu)a 'u#' hea*n) ee#ent cod water stora)e tan+ and hot water stora)e tan+% The heat e(chan)er which incudes the heica co''er tube and insuated she is 'erfect& seaed so as to avoid the ea+a)e of hot water $owin) throu)h tube and cod water $owin) throu)h she in a counter $ow #anner %The water in the stora)e tan+ is heated usin) a hea*n) ee#ent as the water reaches to a 'rescribed te#'erature% The centrifu)a 'u#' circuates the hot water throu)h the heica coi% The ba vaves are   used to contro the $ow rate of  hot and cod water% A caibrated rota#eter was used to #easure the she side cod water $ow rate whie for the tube side hot water $ow rate a caibrated vane t&'e $ow #eter is used and data was recorded usin) a data o))er s&ste#% The inet and outet te#'eratures of hot and cod water were recorded usin) caibrated L- 63 te#'erature sensor throu)h the data o))er s&ste#% 4ressure )au)es were used to #easure the 'ressure oss in the heica coi tube% The tube and she side ther#o1'h&sica 'ro'er*es of water were assessed at their #ean te#'eratures% A44LICATION0  The use of heica& coied e(chan)ers con*nues to increase%A''ica*ons incude i7uid hea*n)8cooin) stea# heaters va'or1i9ers cr&o)enic cooin) and vent condensin)% Listed beow are the detais for standard services in which heicae(chan)ers warrant considera*on%: 0a#'e Cooin): Ana&9er 4re1cooin): 0ea Cooers: Condensers: Cr&o)enic ;a'ori9ers: Co#'ressor Inter1 and A<er1Cooers: Genera A''ica*ons  . LI-ITATION0  There are ver& few i#ita*ons for the use of heica& coied heat e(chan)ers%Genera& a 'ressure i#it of 2= === 'si) covers the #a!orit& of a''ica*ons%Te#'erature i#its are deter#ined b&  construc*on #aterias as are the corrosion rates%0urface areas of 2 to >3= s7% <%are avaiabe and usin) units inseries or 'arae #a& e(tend this ran)esubstan*a&%% CONCLU0ION  The desi)n and ther#a evaua*on of stud& under considera*on is done and hasfoowin) concusions,2% The desi)n 'rocedure ado'ted )ives si9in) and ra*n) ana&sis of heica coi heat e(chan)er and resuts are found in )ood a)ree#ent with the e('eri#enta resuts%5% ?& increasin) #ass $ow rate of hot water the e@ec*veness increases at constant cod water #ass $ow rate% 6% hen #ass $ow rate of cod water is #aintained at ower vaue the e@ec*veness is #a(i#u# but when #ass $ow rates of cod water increases e@ec*veness decreases corres'ondin)&%B%The overa heat transfer coecient and Heat transfer rate increases with increase in #ass $ow rate of hot water% 3% Aso te#'erature of hot water at outet increases with increase in hot water $ow rate in the tube%
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks