INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY
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1 INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY A PATH FOR HORIZING YOUR INNOVATIVE WORK EXPERIMENTAL INVESTIGATION OF HELICAL COIL AND STRAIGHT TUBE HEAT EXCHANGER 1. Ph. D Scholar, Department of Mechanical Engineering 2. Prof. & HOD, Department of Mechanical Engineering SPECIAL ISSUE FOR NATIONAL LEVEL CONFERENCE "Technology Enabling Modernization of Rural India (TMRI- 2018) PRAVIN GAVADE 1, DR. NEERAJ KUMAR 2 Accepted Date: 19/03/2018; Published Date: 01/04/2018 Abstract: Heat exchangers are one of the key engineering apparatus used for transmitting heat from one liquid to another. Heat exchangers are commonly used in several types of application such as power plants, nuclear reactors, and refrigeration and air-conditioning systems, mechanical engineering. Helical coil structure is very effective for heat exchangers because they have a large heat transfer area in a small space, with great heat transfer coefficients validate to straight tube heat exchanger. The improved heat transfer coefficients are due to the curvature of the coil, which leads centrifugal forces to act on the fluid, which generates secondary flow. This paper emphasis on the Experimental investigation of helical coil heat exchanger and its study is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient for both parallel flow and counter flow arrangement. Keywords: Helical Coil, Overall Heat Transfer Coefficient, Straight Tube, Effectiveness Etc. Corresponding Author: PRAVIN GAVADE PAPER-QR CODE Access Online On: How to Cite This Article: 224
2 INTRODUCTION A heat exchanger is known for transferring thermal energy among two or more liquids, at diverse temperatures and in thermal contact. Also the performance of the heat exchanger being enhanced, the heat transfer improvement enables the size of the heat exchanger to be significantly decreased. Helical coil heat exchangers are widely found in many industrial applications. The helically coiled tubes have advantage over straight tubes when working in heat transfer applications. In the coiled tube, the flow adjustment is due to centrifugal forces. The centrifugal forces are acting on the moving fluid due to the curvature ratio of the helical coil leads to the growth of Secondary flow which creates turbulence heat transfer rate increases. The amount of the centrifugal force depends upon axial velocity of flowing liquid and radius of curvature of the helical coil. HELICAL COIL GEOMETRY The diagram expresses different factors of the helical coil. Where, d= tube diameter, D= shell diameter, Rc = coil radius, b=helical coil pitch. Figure 1: Shell and helical coil heat exchanger. The material of helical coil tube is soft copper. The real helical coil is shown as below: Figure 2: Helical coil tube. 225
3 Factors of heat exchangers The different factors essential for heat exchanger are formulated beneath Sr. No. Dimensional factors Dimensions (mm) 1 Shell outside diameter [Do] Shell inside diameter [Di] Shell Thickness Outside tube diameter [do] Inside tube diameter [di] Tube thickness 0.40 EXPERIMENTAL METHOD AND FABRICATION A. Experimental Structure Figure 3 Experimental Structure Above figure demonstrates helical coil and straight coil heat exchanger. The set-up is heat transferring system in which a hot water flowing inside the tube-side is cooled by cold water flowing of outside tube. The key parts of the cycle are helical coiled tube heat exchanger, pump, storage tank, and heater. The heat exchangers contain a copper coiled tube and protected shell. The dimensions of the heat exchangers are given in Table. Electric heater is used to heat the water in storage tank. The hot water is permitted to pass through copper tubes by using 226
4 pump. Flow rate of hot water and cold water is controlled by valve. The inlet and outlet temperatures of hot and cold water were noted by using thermocouples in the inlet and outlet tubes. Also, all the pipes and connections between the temperature measuring stations and heat exchanger are duly insulated. o Constituents The different constituents required for Setup are listed below as per specification: 1. Helical coil tube: Material Copper Copper tube length 2 m Quantity 1 no. 2. Heater Specifications: Power Watt Voltage V AC/50 Hz 3. Pump: Pump Specification Power 18Watt Head m Speed rpm Discharge - LPH Volt - 220V 4. Thermocouples: For temperature of range 0 to 1200 degree Celsius. For quick response and ease of reading we used this thermometer. HELICAL COIL DESIGN The study of the helical coil heat exchanger is carried by following procedure: Step 1: Coil length (L) =π DC N Dc= m N=6.7 On Exchanging, L = 2 m Step 2: Curvature Ratio 227
5 δ= = Step 3: Pitch Ratio γ = = Step 4: Heat transfer rate: Q = mcp [ T] Where, Q = Heat transfer rate (kj s) m = mass flow rate of water (kg s) cp=specific heat of water ( J kgk) T= Temperature Difference [ ] Step 5. Logarithmic mean temp difference: = Where, Parallel flow: Counter flow: Tco are temperature differences = Inlet temperature of hot Water = Outlet temp of hot water = Inlet temperature of cold Water = Outlet temperature of cold water Step 6: Overall heat transfer coefficient: U = 228
6 Where, U = Overall heat transfer coefficient (W/m 2 ) Q = Heat transfer rate ( ) F = friction factor (1) A = Area of helical coil ( ) = LMTD ( ) Step 7: Effectiveness: Where, Effectiveness RESULT TABLE Result Tables for Helical coil heat exchanger in constant flow rate Helical coil heat exchanger (Constant mass flow rate in parallel flow): Sr. No Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) Helical coil heat exchanger (Constant mass flow rate in counter flow): Sr. No. Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) Result Tables for Straight tube heat exchanger in constant flow rate Straight tube heat exchanger [For constant mass flow rate in parallel flow] 229
7 Sr. No. Temp ( ) (kg/s) Q (KJ/S) U (W/m 2 ) Straight tube heat exchanger [For constant mass flow rate in counter flow] Sr. No. Temp ( ) (kg/s) Q (KJ/S) U (W/m 2 ) Result Tables for Helical coil heat exchanger for varying mass flow rate Helical coil heat exchanger: (varying mass flow rate in parallel flow) Sr. No. Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) Helical coil heat exchanger: (Varying mass flow rate in counter flow) Sr. No. Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) Result Tables for Straight tube heat exchanger in varying flow rate Straight tube heat exchanger for varying mass flow rate in parallel flow 230
8 Sr. No. Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) Straight tube heat exchanger for varying mass flow rate in counter flow Sr. No. Temp( ) (kg/s) Q (KJ/S) U (W/m 2 ) GRAPHS o Varying mass flow rate: Variation of Mass flow rate vs. Temperature drop Variation of heat transfer rate vs. mass flow rate 231
9 Variation of heat transfer coefficient vs mass flow rate Variation of effectiveness vs. mass flow rate o Constant mass flow rate: Temperature Vs. Overall Heat Transfer 232
10 Temperature Vs. Effectiveness: Temperature Vs heat transfer rate CONCLUSION The helical pipe has the greater surface so the time period of fluid contact with surface is greater which results into improved heat transfer compared to that of straight pipe. Effectiveness is greater in counter flow arrangement for both helical and straight heat exchangers compare to parallel flow arrangement. When temperature increases there is a slow rise in the heat transfer rate in both straight tube and helical coil but it is extreme in helical coil. Also effectiveness increases by temperature increases and decreases when mass flow rate is increased. The temperature drop for helical coiled tube is higher than the straight tube. From this experimental investigation for same space and volume in industry the helical heat exchangers are more efficient than normal straight heat exchangers. REFERENCE 1. N. D. Shirgire (2014), Comparative Study and Analysis between Helical Coil and Straight Tube Heat Exchanger International Journal of Engineering Research & Technology (IJERT) Vol 4 Issue Pramod S. Purandare, Mandar M. Lele, Rajkumar Gupta (2012), Parametric Analysis of Helical Coil Heat Exchanger International Journal of Engineering Research & Technology (IJERT) Vol. 1 Issue
11 3. B. ChinnaAnkanna, B. Sidda Reddy (2014), Performance Analysis of Fabricated Helical Coil Heat Exchanger International Journal of Engineering Research, Volume No.3 Issue No: Special 1, pp: Mr. Dhiraj D. Shinde (2015), Experimental Study of Heat Transfer Parameters using internal threaded pipe fitted with inserts of different materials International Journal of Engineering Research & Technology (IJERT) Vol. 1 Issue MadhuriTayde (dec2014), Heat Transfer Analysis of a Helically Coiled Heat Exchange International Journal of Engineering Research & Technology (IJERT) Vol 4 Issue Namrata D. Ranaware (2015), A Review on Comparison between Shell and Tube Heat Exchanger and Helical Coil Heat Exchanger International Journal of Engineering Research & Technology (IJERT vol 2 Issue 2). 7. Swapnil Ahire (2015), Fabrication and Analysis of Counter Flow Helical Coil Heat Exchanger International Journal of Engineering Research & Technology (IJERT) Vol Shiva Kumara (2013), Numerical Analysis of a Helical Coiled Heat Exchanger using CFD International Journal of Engineering Research & Technology (IJERT) vol
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