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7.A. - Page 274 of 285 <br />2019 Nonresidential New Construction Reach Code Cost Effectiveness Study <br />Building Component <br />Measure Name <br />Measure Description <br />Notes <br />Include? <br />For small hotels, the ventilation requirement could be <br />met by various approaches, and the most common <br />ones are: <br />a. Exhaust only system, and ventilation is met by <br />infiltration or window operation. <br />b. Through a Z -duct that connects the zone AC <br />unit's intake to an outside air intake louver. <br />C. Centralized ventilation system (DOAS) <br />HVAC <br />Heat recovery ventilation <br />For the hotel, recover and transfer heat from exhausted <br />The prototype developed for the small hotel is using <br />N <br />air to ventilation air. <br />Type 2 above. The major consideration is that <br />currently, HRV + PTACs cannot be modeled at each <br />guest room, only at the rooftop system. Option 1 <br />would require the same type of HRV implementation <br />as Option 2. Option 3 may be pursuable, but would <br />require a significant redesign of the system, with <br />questionable impacts. Previous studies have found <br />heat recovery as cost effective in California only in <br />buildings with high loads or high air exchange rates, <br />given the relatively mild climate. <br />Require Economizers in Smaller <br />Lower the capacity trigger for air economizers. Previous <br />HVAC <br />studies have shown cost effectiveness for systems as low <br />y <br />Capacity Systems <br />as 3 tons. <br />Current T24 and 90.1 requirements limit VAV minimum <br />flow rates to no more than 20% of maximum flow. <br />Proposal based on ASHRAE Guideline 36 which includes <br />sequences that remove technical barriers that previously <br />HVAC <br />Reduce VAV minimum flow limit <br />existed. Also, most new DDC controllers are now capable <br />y <br />of lower limits. The new limit may be as low as the <br />required ventilation rate. A non -energy benefit of this <br />measure is a reduction in over -cooling, thus improving <br />comfort. <br />•• <br />2019-07-25 <br />526 <br />