International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169 Volume: 2 Issue: 4 850 – 853 _______________________________________________________________________________________________ 850 IJRITCC | April 2014, Available @ http://www.ijritcc.org _______________________________________________________________________________________ Improve the Performance of Heat Exchanger: Twisted Tape Insert With Metallic Wiry Sponge Maheshkumar J.Patel 1 , K.S.Parmar 2 , U. R. Soni 3 1. M.E.Student, Sardar Patel institute of technology, Gujarat, India. Email id: maheshjpatel6490@gmail.com 2. M.E.Student, Sardar Patel institute of technology, Gujarat, India. 3. PhD Student, PAHER, Udaipur, Rajasthan, India soniur@gmail.com Abstract-- Enhancing heat transfer surface are used in many engineering applications such as heat exchanger, air conditioning, chemical reactor and refrigeration systems, hence many techniques have been investigated on enhancement of heat transfer. One of the most important techniques used are passive heat transfer technique. These techniques when adopted in Heat exchanger proved that the overall thermal performance was improved significantly. This experiment works taken by researchers on this Augmentation Technique such as Twisted Tape. So, Researchers tried to increase the effective surface area Contact with fluid to increases the heat transfer rate in the heat exchanger. We work on Double tube type Heat Exchanger and fabricate the Experimental setup & make Comparative Study with twisted tape Flat Type Rectangular section, Simply Twisted Tape and Twisted Tape insert with Wiry Metallic Sponge. From this experiment it has been observed that the twisted tape insert with metallic wiry sponge gives more heat transfer as compared to the plain tube and twisted tape insert in the counter flow heat exchanger. Also very small difference of friction factor has been observed between twisted tape and twisted tape with sponge inserts at higher Reynolds number. Keywords: Double pipe heat exchanger, Augmentation techniques, twisted tape, sponge. __________________________________________________*****_________________________________________________ INTRODUCTION Heat exchangers are devices that can be used to transfer heat from a fluid stream (liquid or gas) to another fluid at different temperatures. Heat Exchanger is a device in which the exchange of energy takes place between two fluids at different temperature. A heat exchanger utilizes the fact that, where ever there is a temperature difference, flow of energy occurs. So, That Heat will Flow from higher Temperature heat reservoir to the Lower Temperature heat Reservoir. The flowing fluids provide the necessary temperature difference and thus force the energy to flow between them. Heat exchangers are used in different processes ranging from conversion, utilization & recovery of thermal energy in various industrial, commercial & domestic applications. These include power production, process, chemical and food industries, electronics, environmental engineering, and waste heat recovery, manufacturing industries and air conditioning, refrigeration and space applications. Examples of heat exchangers that can be found in all homes are heating radiators, the coils on your refrigerator and room air conditioner and the hot water tank. Augmentation Techniques of Heat Transfer: Twisted Tape Insert The augmentation techniques of heat transfer are widely applied to improving the performance of heat exchangers in chemical industries and air conditioning systems to reduce the size and costs of the heat exchangers, these techniques are classified as active and passive techniques. The active techniques require external forces, e.g. electric field, surface vibration or Jet impingement. The passive techniques require special surface geometries or swirl/vortex flow devices. Many of experimental works on heat transfer augmentation using twisted tape as swirl/vortex flow devices have been reported in the literature. LITERATURE REVIEW Bodius Salam et al. [1] experimental investigation was carried for measuring tube side heat transfer coefficient of water for turbulent flow in a circular tube fitted with twisted tape insert of 5.3 twist ratio. Watcharin Noothong et al. [2] influences of the twisted tape insert of twist ratio 5 and 7 on heat transfer and flow friction characteristics in a concentric double pipe heat exchanger have been studied experimentally. Veeresh fuskele et al. [3] does investigation on the double pipe heat exchanger with new kind of insert called twisted wire mesh. They make experimental set up with copper pipes and use twisted tape wire mesh of twist ratio 5.0 and 7.0. A. rahul Kumar et al. [4] do experimental analysis of heat transfer augmentation by using twisted tapes of different twist ratio as flow arrangement inside the tubes. Maughal Ahmed Ali Baig et al. [5] perform twisted tapes with holes and with baffle plates are carried out to find the suitable design for the heat transfer augmentation. Prof. Naresh B. Dhamane et al. [6] presents an experimental study of heat transfer and friction characteristics in turbulent flow generated by a helical strip inserts with regularly spaced cut passages, placed inside a circular pipe across the test section. The experiments were conducted for water flow rates in the range of Re 5000 to Re 30000. Aim of this paper is to improve the heat transfer rate of double pipe heat exchanger by insert twisted tape with metallic wiry sponge. It