How to design a Spiral Heat Exchanger?

It is better you leave this difficult calculations to experts, especially if you do not know proper values for parameters like h and U. unless if you are a student............then I recommend you to get "some help" from Holman book "Heat Transfer", chapter - 10 section: "Compact Heat Exchangers.

I've done the design part of this exchanger & might share the general approach on linkedin also so that others can take it's advantage.

There are many suppliers of spirals HTX - why would you want to design one? Alfa Laval, GEA, there are quite a few.
Same goes for plate heat exchangers.

@Varsha Gupta. Please do share your design approach. We all can learn something.

Yes Varsha your sharing might help us learn something new. Please do share.

I have worked on design of several heat exchangers and firmly believe that standard design available is for shell & tube heat exchangers. We are also working with a person whose full time activity is design of heat exchangers and we had also this question to him and he had replied that the optimum design can be done by manufacturers.Please update me if you find anything on the subject

Please share for every bodies benefit / comments.

Yeah, surely I'll do it by these weekends only.

Yesterday I had written that Spiral Heat exchanger design is possible only by manufacturer. However in Perry's handbook, there is a reference that P.E.Minton of Union Carbide had given the design of Spiral Heat Exchanger in Chemical Engineering in 1970. This article is easily available on Internet and I have downloaded it.
I thank you for broadening my view and making me more open. I find that the more and more you know, you start finding that there is a lot-lot more to be known.