Ppt.hybrid ac


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Ppt.hybrid ac

  1. 1. <ul><li>EXPERIMENTAL STUDIES ON DESICCANT WHEEL BASED HYBRID AIR-CONDITIONING </li></ul><ul><li>A </li></ul><ul><li>M. TECH. PROJECT REPORT </li></ul><ul><li>BY </li></ul><ul><li>GANESH WARKHADE </li></ul><ul><li>(MT 2006609) </li></ul><ul><li>UNDER THE GUIDANCE OF </li></ul><ul><li>Dr. NEERAJ AGRAWAL </li></ul><ul><li>  </li></ul><ul><li>Dr. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE DEPARTMENT OF MECHANICAL ENGINEERING, </li></ul><ul><li>AUGUST,2010 </li></ul>
  2. 2. Overview of the project <ul><li>Introduction </li></ul><ul><li>Objective </li></ul><ul><li>Desiccant Dehumidification Process </li></ul><ul><li>Desiccant Cooling System </li></ul><ul><li>Desiccant Dehumidifier </li></ul><ul><li>Desiccants </li></ul><ul><li>Desiccant Cycle </li></ul><ul><li>Evaporative Cooling System </li></ul><ul><li>Design and Fabrication of the System </li></ul><ul><li>Results and Discussion </li></ul><ul><li>Conclusion </li></ul>
  3. 3. Introduction <ul><li>A conventional air conditioner consumes large amount of electrical energy especially in hot and humid climatic conditions due to high latent load which is decided by the outside humidity contents. </li></ul><ul><li>Desiccant wheel based hybrid air-conditioning system is one of the promising alternative to handle the high latent load efficiently where sensible and latent heat of air are being removed separately . </li></ul>
  4. 4. Objective <ul><li>The objective of the present work is to performance evaluation of a hybrid air-conditioning system employing an in-direct evaporative cooling approach for comfort air-conditioning applications. </li></ul>
  5. 5. Desiccant Dehumidification Process <ul><li>Process can be achieved by using a hygroscopic material, which absorbs or adsorbs the water vapor from the moisture. If this process is thermally isolated, then the enthalpy of air remains constant, as a result the temperature of air increases as its moisture content decrease. </li></ul><ul><li>The absorption of water by the hygroscopic material is an exothermic reaction. </li></ul>
  6. 6. Desiccant Cooling Systems <ul><li>Desiccant cooling consists in dehumidifying the incoming air stream by forcing it through a desiccant material and then drying the air to the desired indoor temperature. To make the system working continually, water vapor adsorbed/absorbed must be driven out of the desiccant material (regeneration) so that it can be dried enough to adsorb water vapor in the next cycle. therefore, comprises principally three components, namely the regeneration heat source, the dehumidifier (desiccant material), and the cooling unit. </li></ul>
  7. 8. The Desiccant Dehumidifier <ul><li>In the case, the desiccant is employed in its solid state, the desiccant dehumidifier is generally a slowly rotating desiccant wheel or a periodically regenerated adsorbent bed. </li></ul>
  8. 9. Desiccants   <ul><li>Any material that attracts and holds water vapor is a desiccant. Commercial desiccants attract and release a large amount of water vapor depending on moisture available in the environment they are exposed to. </li></ul><ul><li>The desiccant material converts the latent moisture load to a sensible heat load during the sorption process. In fact, the process releases heat in an amount somewhat greater than (~1.0 to 1.4 times) the heat of condensation. </li></ul>
  9. 10. <ul><li>The exact magnitude of the released energy, known as the heat of sorption, depends in great part upon the isotherm properties of the desiccant. </li></ul><ul><li>Desiccant isotherms are classified by Brunauer Type, with Types I to III representing the extremes in equilibrium relationships. </li></ul>
  10. 11. Desiccant cycle <ul><li>Desiccant Cycle 1 </li></ul><ul><li>Desiccant Cycle 2 </li></ul>
  11. 12. Evaporative Cooling <ul><li>When water is added to air, the temperature decreases. This is the principle used in what is called evaporative cooling. It may be direct or indirect type. </li></ul><ul><li>The indirect evaporative cooling consists in using another air stream cooled directly and evaporative (called secondary air) as the heat sink to cool the process air (called primary air) inside a heat exchanger, generally a plate heat exchanger (PHE). </li></ul>
  12. 13. Indirect Evaporative Cooling
  13. 14. Experimental test set up layout
  14. 15. The photo of the experimental setup
  15. 16. Experimental methodology <ul><li>A fully instrumented prototype desiccant wheel based hybrid air-conditioning system had been developed as shown in Fig. The system comprises split 1TR window AC’s cooling coil, indirect evaporative cooler and desiccant wheel which were combined judiciously by means of suitably designed duct. A separate test room of the size 12 feet X 12 feet X 8 feet was constructed with recirculation facility to carry out the experimentation. </li></ul>
  16. 17. Results and discussion <ul><li>Experiments were conducted for ventilation, mixed and recirculation cycle with varying the regeneration temperatures to 110 0 C, 120 0 C, 130 0 C and 140 0 C. Air was artificially humidified to check the effect of outside humidity. </li></ul>
  17. 18. Observation Table
  18. 19. 1. Effect of Latent Load ( ventilation cycle with 140 0 C regeneration )
  19. 20. Ventilation cycle with 130 0 C regeneration
  20. 21. 2. Power Consumption by the Hybrid System ( Tr = 140 0 C , Cycle = Vent.)
  21. 22. 3. Power Consumption by the Window AC only
  22. 23. 4.Effect of regeneration temperature on power consumption
  23. 24. 5. Effect of humidity on COP
  24. 25. 6. Static Pressure Drop
  25. 26. Conclusion <ul><li>Performance of the desiccant wheel based hybrid air conditioning system is evaluated and following conclusion can be made. </li></ul><ul><li>For a chosen regeneration temperature, hybrid air conditioning system is economical up to certain humidity level compare to window air-conditioner alone. </li></ul><ul><li>If the regeneration temperature increases, the loads gets completely separated, thereby performance of cooling coil improves a lot i.e. 70% to 80%. </li></ul><ul><li>Performance of cooling coil is significantly governed by latent load . </li></ul><ul><li>Hybrid air-conditioning can be a good option when the humidity level is high. </li></ul>
  26. 27. THANK YOU