Slide 1

Law, C.L. and Mujumdar, A.S. Energy Efficiency and Energy Saving in Drying, in Dry-

ing of Foods, Vegetables and Fruits - Volume 1, Ed. Jangam, S.V., Law, C.L. and Mu-

jumdar, A.S., 2010 , ISBN - 978 -981-08-6759-1, Published in Singapore, pp. 151-164.

Chapter 7

Energy Efficiency and Energy Saving in Drying

Chung Lim Law^1 and A.S. Mujumdar^2

(^1) Department of Chemical and Environmental Engineering, The University of Nottingham, Malaysia
Campus
(^2) Mechanical Engineering Department & M3TC National University of Singapore, Singapore

Contents

7.1. INTRODUCTION .................................................................................................................... 147

7.2. WHY CONVENTIONAL DRYERS HAVE LOW ENERGY EFFICIENCY ...................... 147

7.2.1. Low contacting efficiency ........................................................................................................ 147

7.2.2. Energy loss resultant from discharging of exhaust gas .............................................. 148

7.2.3. Lack of heat insulation .............................................................................................................. 148

7.2.4. Improper drying strategy due to lack of understanding of drying science ........ 148

7.3. ENERGY EFFICIENCY ........................................................................................................... 149

7.4. METHODS TO IMPROVE ENERGY EFFICIENCY........................................................... 150

7.4.1. Heat Recovery .............................................................................................................................. 151

7.4.2. Use of Phase Change Material (PCM) .................................................................................. 152

7.4.3. Control of dryer ........................................................................................................................... 152

7.4.4. Development of mathematical modeling .......................................................................... 152

7.4.5. Drying strategy for energy savings ..................................................................................... 153

7.5. CONCLUSION.......................................................................................................................... 154

Law, C.L. and Mujumdar, A.S. Energy Efficiency and Energy Saving in Drying, in Drying of Foods,
Vegetables and Fruits - Volume 1, Ed. Jangam, S.V., Law, C.L. and Mujumdar, A.S., 2010, ISBN - 978 -
981 - 08 - 6759 - 1, Published in Singapore, pp. 1 45 - 158.