1. An experimental and numerical study on pressure drop coefficient of ball valves
A. Ozdamar, K. Turgut Gursel, Y. Pekbey, B. Celikag

2. Author index v.8-04

3. Changes of business models in electricity distribution
P. Trygg, J. Toivonen, P. Järventausta

4. Development, design, and performance of a pv-ventilated greenhouse dryer
S. Janjai, V. Khamvongsa, B.K. Bala

5. Energy-water nexus an integrated modeling approach
Debborah M. Marsh, Deepak Sharma

6. List of reviewers v.8-04

7. Multi-objective optimal planning and operation of distribution system using genetic algorithm
A.A. Abou El-Ela, G.E.M. Aly, A.A.E. Shammah

8. Solar parabolic trough collector hot water system
A. Valan Arasu, T. Sornakumar

9. Studies on port injected hydrogen in a dual fuel d.i. diesel engine
N. Saravanan, G. Nagarajan, C. Dhanasekaran, K.M. Kalaiselvan, G. Sanjay

10. Wind energy cost and feasibility of a 2 mw wind power project
V.P. Khambalkar, S.R. Gadge, S.B. Dahatonde, M.U. Kale, D.S. Karale

11. Wind energy in sudan for water pumping in rural areas
Abdeen Mustafa Omer, Siddig Adam Omer