The heating load of a building at winter design conditions is 3 600 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial dual fuel (gas- and oil-fired) hot water boilers provided in Table 6.4, select a boiler that can efficiently meet this load based on the
a. MBH output rating
b. I = B = R net rating

Table 6.4

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MBH 770 1155 1540 1925 2310 2695 3080 3573 3970 4367 4764 5161 5558 5955 6352 6749 7146 Input kW 2628 3942 5256 6570 7884 9198 10 512 12 195 13 550 14 905 16 260 17 614 18 969 20 324 21 679 23 034 24 389 MBH 612 918 1224 1530 1836 2142 2448 2754 3060 3366 3672 3978 4284 4590 4896 5202 5508 Output kW 2089 3133 4178 5222 6266 7311 8355 9399 10 444 11 488 12 533 13 577 14 621 15 666 16 710 17 754 18 799 I=B=R Net Rating MBH kW 532 798 1064 1330 1596 1862 2129 2395 2661 2927 3193 3459 3724 3991 4257 4523 4790 1816 2724 3631 4539 5447 6355 7266 8174 9082 9990 10 898 11 806 12 710 13 621 14 529 15 437 16 348