Reading over "Playing the Smart Hand" (Jan. 2001, p. 42), I noticed that Table 3, Chiller Algorithm Output, was not the latest one that I had sent with my article revision.The electric chiller calculation that was shown on the table in the magazine was missing the kilowatt/ton in the formula.Kent W.
Reading over “Playing the Smart Hand” (Jan. 2001, p. 42), I noticed that Table 3, Chiller Algorithm Output, was not the latest one that I had sent with my article revision.
The electric chiller calculation that was shown on the table in the magazine was missing the kilowatt/ton in the formula.
Kent W. Peterson, P.E., Chief Mechanical Engineer and Principal, P2S Engineering, Long Beach, Calif.
Chiller Algorithm Output
| Example 1 | Example 2 | Example 3 | ||||
| Gas ($/therm) | $ 0.35 | $ 0.35 | $ 0.35 | |||
| Electric ($/kWh) | $ 0.05 | $ 0.12 | $ 0.18 | |||
| Plant Load (Tons) | Best Chiller Combination | Cost/Ton-Hr | Best Chiller Combination | Cost/Ton-Hr | Best Chiller Combination | Cost/Ton-Hr |
| 400 | 2 | $0.031 | 1 | $0.066 | 1 | $0.075 |
| 500 | 2 | $0.029 | 1 | $0.057 | 1 | $0.065 |
| 600 | 2 | $0.028 | 2 | $0.068 | 3 | $0.089 |
| 700 | 2 | $0.028 | 2 | $0.068 | 3 | $0.082 |
| 800 | 2 | $0.028 | 3 | $0.066 | 3 | $0.075 |
| 900 | 2 | $0.029 | 3 | $0.061 | 3 | $0.069 |
| 1,000 | 5 | $0.029 | 3 | $0.057 | 3 | $0.065 |
| 1,100 | 5 | $0.029 | 4 | $0.068 | 4 | $0.094 |
| 1,200 | 5 | $0.028 | 4 | $0.067 | 4 | $0.093 |
| 1,300 | 5 | $0.028 | 4 | $0.066 | 4 | $0.092 |
| 1,400 | 5 | $0.028 | 4 | $0.067 | 6 | $0.092 |
| 1,500 | 5 | $0.028 | 6 | $0.068 | 6 | $0.090 |
| 1,600 | 5 | $0.028 | 6 | $0.067 | 6 | $0.088 |
| 1,700 | 5 | $0.028 | 6 | $0.066 | 6 | $0.087 |
| 1,800 | 5 | $0.029 | 6 | $0.065 | 6 | $0.086 |
| 1,900 | 5 | $0.030 | 6 | $0.065 | 6 | $0.087 |
| 2,000 | 5 | $0.031 | 6 | $0.066 | 6 | $0.088 |
