ASHRAE Journal - January 2009 - (Page 32) Bin Weather Data OADB (°F) 117.5 112.5 107.5 102.5 97.5 92.5 87.5 82.5 77.5 72.5 67.5 62.5 57.5 52.5 47.5 42.5 37.5 32.5 27.5 MCWB (°F) 72 71 71 70 69 67 65 62 59 55 52 49 47 44 41 37 33 28 24 ECWT (°F) 80.1 78.9 78.6 77.5 76.3 74.3 72.3 69.5 66.6 62.9 59.5 57.0 55.0 55.0 55.0 55.0 55.0 55.0 55.0 Total Bin Chilled Water Hours Load (Tons) 2 30 184 353 473 628 680 963 827 711 638 872 791 677 486 249 165 25 6 4,045 3,864 3,612 3,538 3,297 3,009 2,686 2,457 2,062 1,745 1,721 1,721 1,721 400 400 400 400 400 400 Standard VSD Chiller Operating Cost Chiller Efficiency (kW/Ton) 0.589 0.583 0.580 0.579 0.572 0.499 0.439 0.380 0.351 0.277 0.231 0.227 0.229 0.229 0.229 0.229 0.229 0.229 0.229 Chiller Power (kW) 2,382 2253 2095 2048 1886 1502 1179 934 724 483 398 391 394 92 92 92 92 92 92 Chiller Energy (kWh) 4,765 67,580 385,428 723,073 892,110 943,021 801,680 899,105 598,495 343,713 253,697 340,741 311,813 62,013 44,518 22,808 15,114 2,290 550 Blended Electrical Use Rate ($/kWh) 0.073 0.073 0.073 0.073 0.073 0.073 0.073 0.067 0.067 0.067 0.067 0.067 0.067 0.067 0.067 0.059 0.059 0.059 0.059 Chiller Operating Cost $350 $4,960 $28,290 $53,074 $65,481 $69,218 $58,843 $59,790 $39,800 $22,857 $16,871 $22,659 $20,736 $4,124 $2,960 $1,337 $866 $134 $32 $472,402 Total Seasonal Chiller Operating Cost = Table 1: Chiller analysis. Bin Weather Data OADB (°F) 117.5 112.5 107.5 102.5 97.5 92.5 87.5 82.5 77.5 72.5 67.5 62.5 57.5 52.5 47.5 42.5 37.5 32.5 27.5 MCWB (°F) 72 71 71 70 69 67 65 62 59 55 52 49 47 44 41 37 33 28 24 ECWT (°F) 80.1 78.9 78.6 77.5 76.3 74.3 72.3 69.5 66.6 62.9 59.5 57.0 55.0 55.0 55.0 55.0 55.0 55.0 55.0 Bin Hours 2 30 184 353 473 628 680 963 827 711 638 872 791 677 486 249 165 25 6 Hot Water Heating Load (MBH) 6,928 6,894 6,826 6,836 6,773 6,681 6,565 6,497 6,333 7,341 9,544 11,757 13,975 16,193 18,382 20,538 22,678 24,780 26,853 Boiler Operating Cost Heating Input to 85% Efficient Boiler (MBH) 8,150 8,110 8,031 8,042 7,968 7,860 7,724 7,644 7,451 8,636 11,228 13,832 16,442 19,051 21,626 24,162 26,680 29,153 31,592 Natural Gas Consumption (MBtu) 16,300 243,313 1,477,668 2,838,890 3,768,978 4,936,189 5,252,094 7,361,210 6,161,693 6,140,161 7,163,693 12,061,629 13,005,318 12,897,586 10,510,446 6,016,329 4,402,271 728,835 189,553 Natural Gas Consumption Cost ($) $179 $2,676 $16,254 $31,228 $41,459 $54,298 $57,773 $80,973 $67,779 $67,542 $78,801 $132,678 $143,058 $141,873 $115,615 $66,180 $48,425 $8,017 $2,085 $1,156,894 Total Season Boiler Operating Cost = Table 2: Boiler analysis. 32 ASHRAE Journal ashrae.org January 2009 http://www.ashrae.org
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