A training manual in conducting a workshop in the design, construction, operation, maintenance and repair of hydrams
 Session 13: Inter-relationships within the hydram (11-15 hours)
 Handout 13A: Exercises: Determining the effect of:
 Exercise 1: h:H ratio on efficiency Exercise 2: Frequency on the maximum delivery head to drive head ratio Exercise 3: Frequency on efficiency, quantity of water entering the hydram and quantity of water delivered Exercise 4: Volume of air in the accumulator on efficiency Exercise 5: Drive pipe length on efficiency Exercise 6: Drive pipe diameter on efficiency Exercise 7: The snifter on efficiency Exercise 8: Effect of the drive material on efficiency

### Exercise 1: h:H ratio on efficiency

TASK: DETERMINE THE EFFECT THE h:H RATIO HAS ON EFFICIENCY

Variables: efficiency (n), water delivered (q), water used (Q), time of experiment, water wasted (Qw)

Constants: Drive head (H),frequency (f), volume of air in the accumulator

Range: 2:1 to 20:1

PROCEDURE:

1. Install a hydram to a drive head.

2. Accurately measure the drive head.

3. Attach and set an adjustable pressure relief valve and a pressure gauge to the discharge.

4. Start the hydram.

5. Open the snifter in order to fill the accumulator with air and then close the snifter for the duration of the experiment.

6. Calculate the impulse valve frequency.

7. Simultaneously measure the time of the experiment, water delivered (q) and water wasted (Qw)

8. Calculate the efficiency (n).

9. Repeat the experiment making sure to keep the drive head, frequency and the volume of air in the accumulator the same and change the delivery head in order to develop a new h:H ratio.

TASK: DETERMINE THE EFFECT THE h:H RATIO HAS ON EFFICIENCY

 Experiment # h:H ratio H h Qw q Q f s w t n Notes

The effect of the delivery head to drive head ratio on efficiency