Author Notes Table Snafu in Article
Staff -- Consulting-Specifying Engineer, 2/1/2002
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.
Editor's Note: We did indeed display the incorrect table for this January article, co-written by Mr. Peterson and Milton Meckler, P.E. Our apologies to the two authors, and to any readers who may have been confused by the mistake. The correct chiller algorithm output is shown at the right.
| 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 |
