Chilled and hot water system and pipe design

That is a very broad subject - you would be best served to obtain some books, such as:

http://www.ashrae.org/publications/page/1280

Thank you and i agree that it is a vast subject.

I am aware of heat load calculation and duct designing but i want to know procedure involved in design, sizing of the chw and hot water pipe (Main and branch piping) and selection of chiller and pump motors (Complete chilled and hot water system)

Your advise would be a great help.

Thank you

Here is a good, free book for the fundamentals of pumps/piping:

http://www.lightmypump.com/pump_book.htm

Check some of the pump manufacturers that specialize in supplying the parts. Bell & Gossett, Taco, Grundfos and others have web pages and catalogs dedicated to proper design of chilled and hot water systems. This service is provided so engineers do not mis-apply their product and make the equipment look bad. They will also provide free software to qualified designers to aid in design.