1 / 20

DESIGN AND PERFORMANCE EVALUATION OF AN EVAPORATIVE HEAT EXCHANGER

DESIGN AND PERFORMANCE EVALUATION OF AN EVAPORATIVE HEAT EXCHANGER. A.O. MURITALA, S.O. OBAYOPO, S.K. FASHOGBON, O.T. POPOOLA * , S.A ADIO Department of Mechanical Engineering, Obafemi Awolowo University, Ile-Ife , Nigeria.

laksha
Download Presentation

DESIGN AND PERFORMANCE EVALUATION OF AN EVAPORATIVE HEAT EXCHANGER

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DESIGN AND PERFORMANCE EVALUATION OF AN EVAPORATIVE HEAT EXCHANGER A.O. MURITALA, S.O. OBAYOPO, S.K. FASHOGBON, O.T. POPOOLA*, S.A ADIO Department of Mechanical Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria. International Conference on Innovations in Engineering and Technology (IET 2011) UNIVERSITY OF LAGOS, FACAULTY OF ENGINEERING, AKOKA, LAGOS, Nigeria

  2. INTRODUCTION

  3. Evaporative Cooling • The increased air filtration qualities • Simplified operation and maintenance • Lower costs • Lower energy usage • Less greenhouse gas • No CFC's or HFC's

  4. Evaporative Cooler • Cabinet • Reservoir Tank • Pad • Blower • Electric Motor • Pump Fig 1: Schematic diagram of an evaporative cooler

  5. Objective • To design and construct an evaporative cooler. • To evaluate the performance of the cooler.

  6. DESIGN

  7. General Reduction in the discomfort index by 90% Required fan power is linearly dependent on the floor area to be cooled. Building heat balance (EC sizing) SOLAR HEAT + HEAT FROM EQUIPMENT & PEOPLE = HEAT REMOVED BY EAC

  8. Cabinet Reservoir Tank • Galvanized iron sheet • 50x55x70 cm3 • One sided Cabinet Reservoir Tank • Inlet • Outlet • (50 x 55 x 23) cm3

  9. Evaporative Pads • Aluminum fins • 35 x 47 x 10 cm3 Blower

  10. Electric Motor • half-horse power connected by a direct drive • 2 speed motor • 220 V Pump • re-circulating surface pump • 0.5 horse power • Water pump screen

  11. Plate 1: The evaporative cooler housing cabinet Plate 2: The designed evaporative cooler

  12. EVALUATION

  13. Monitored Parameter • Room size 305 x 254 x 203 cm³ • Outside air temperature • Evaporative cooler inlet air temperature and humidity • Evaporative cooler outlet air temperatures and humidity • Water temperature in the evaporative cooler reservoir • Evaporative pad surface temperature • Air speeds & mass flow rate

  14. RESULTS Table 1: Dry and Wet Bulb Temperature, Humidity Ratio humidity gain and Saturation Effectiveness

  15. Saturation Effectiveness & External Dry-Bulb Temperature • increase in saturation effectiveness as the external db temp increases • evaporative cooler is more efficient at higher outside air db temp

  16. Saturation Effectiveness & Humidity Gain • The saturation effectiveness increased as the humidity gain increases

  17. Humidity Gain & External Dry Bulb Temperature • increased gain in humidity ratio at higher external db temp Fig 4.3: Humidity gain as a function of external dry bulb temperature

  18. CONCLUSION • The saturation effectiveness of pad determined from the experimental result falls between the ranges of 70-83.3%. • the pad employed for the construction of the cooler is efficient and reliable. • The designed evaporative coolers can maintain cooled spaces at temperatures below ambient air temperatures. • The performances of the evaporative cooler were significantly affected by weather conditions. • The overall cooled room temperature depression from ambient air temperature reached up to 11 0C, and ambient air temperatures varied between 22–33 0C.

  19. Thank You !!!!

More Related