Residential Heat Exchanger for Heat Transfer from Well Water to Tap Water; Potential
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1 Residential Heat Exchanger for Heat Transfer from Well Water to Tap Water; Potential Energy Saving Project Proposal MANE 6980 Engineering Project By: Carmen Chan Dated: September 29 th, 2011
2 Abstract Size and compare the efficiency of: Shell and tube (forced convection) Plate and frame (forced convection) Cooling coil (free convection) Select a heat exchanger that is most suitable for residential usage to transfer heat from well water to tap water in the winter for energy cost savings. Energy cost could be saved up to $33 per month per person.
3 Shell and Tube Consists of large vessel (shell) and bundle of tubes inside. One fluid enters the shell side and the other enters the tube side. Heat transfer takes place on the surface of the tube. Baffles are used to increase heat transfer efficiency by directing the flow into the tube bundle.
4 Plate and Frame Made of series of plates, which is pressed to form troughs where the fluid travels. Rubber gaskets cemented around the edge to seal from fluid leakage. Fluid flows through alternate plates. Provides large heat transfer area. Operate under medium or low pressure fluid. Rubber gasket
5 Cooling Coil A series of tubes placed inside or outside a tank to control the fluid temperature. Heat transfer depends on free or natural convection Occurs when there is a temperature different within the fluid The higher temperature (lower density) raises to the top and lower temperature (denser) sinks to the bottom.
6 Problem Description Most electric water heaters is only 33% efficiency. Average person uses 152 gal of water per day. Assuming 76 gal will be heated from 32 F to140 F kwh ~$78 per month. Using heat exchanger, tap water could be heated from 32 F to 55 F before entering the water heater 8.49 kwh ~$33 per month energy saving per person. Three types of heat exchanger will be sized and compared to heat tap water using well water
7 Methodology HTRI Incrementally calculates and predicts heat transfer, velocity profile, and pressure drop Mode User specify HTRI calculates Rating Geometry Heat transfer coefficient Simulation Design process condition Geometry partial process condition Partial geometry Partial process condition Choose which geometry shall be calculated by HTRI compare the calculated heat load to specified one Performance Filled in the missing process condition to have an optimized heat exchanger Heat load Reports missing geometry Select the best available design
8 References a) Average Water Use Per Person Per Day. 15 April Data360.org. 18 September < b) Shell and Tube Heat Exchanger. 13 September Shell and Tube Heat Exchanger Wikipedia, the free encyclopedia. 23 September < c) U-tube Heat Exchanger. 5 June File:U-tube heat exchanger.png Wikipedia, free encyclopedia. 23 September < d) Straight-tube heat exchanger 1-pass. 28 May File:Straight-tube heat exchanger 1- pass.png Wikipedia, the free encyclopedia. 23 September < e) Straight-tube heat exchanger 2-pass. 28 May File:Straight-tube heat exchanger 2- pass.png Wikipedia, the free encyclopedia. 23 September < f) Plate Heat Exchanger. 11 September Plate Heat Exchanger Wikipedia, the free encyclopedia. 24 September < g) Plate Frame. 26 April File:Plate frame 1.svg Wikipedia, the free encyclopedia. 24 September < h) Plate Frame. 28 July File:Plate frame 2.png Wikipedia, the free encyclopedia. 24 September < i) Water Density Calculator. 25 September < j) Electric Hot Water Heater. Household Energy Use. 25 September < k) HTRI Heat Transfer Research, Inc HTRI. 18 September <
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