Q80. If the HHV is known as part of a general energy management system, but not sampled on a routine basis, may Tier 1 be used?
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If the HHV is not sampled at the minimum frequency required for Tier 2, as part of your routine operations, Tier 1 may be used if your units are

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250 mmBtu/hr and the fuel is listed in Table C-1. However, if HHV data are obtained at the minimum required frequency, then either Tier 2 must be used, or you may opt to use Tier 3 or 4. (See, ยงยง98.33(b)(1), and 98.34(a))

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