ASHRAE Journal - March 2009 - (Page 27) Photo 5: Second phase heat r ecovery b ypass with temper ature measurement. 1,600,000 1,400,000 1,200,000 1,000,000 kWh 800,000 600,000 400,000 200,000 0 Projected Consumption With No Modifications Projected Consumption With Modifications Actual Consumption (Heating Degree Day Adjusted) 10 11 12 1 2 3 4 Month 5 6 7 8 9 Figure 2: Electrical and natural gas consumption. Comparison between the actual consumption and pr jected with current occupancy o rates (if none of the measures were installed). cooling mode, is controlled to maintain CO2 concentration at required levels. Each zone has a thermostat tied into the DDC, which ensures that thermal comfort is as good as what it was before the measures were implemented. Innovation The heat recovery unit that transfers heat from the exhaust air to the fresh air, supplied by FAU-1, consists of an innovative technology (patent pending). It is a thermosiphon heat exchanger that uses an environment-friendly refrigerant. Thermosiphon heat exchangers, a type of heat recovery unit, were rarely seen on the market. However, modifications were carried out according to the design.3 The modifications increase the effectiveness and decrease the cost of the thermosiphon rendering it more feasible. March 2009 www.info.hotims.com/23933-8 ASHRAE Journal 27 http://www.connfab.com/ash.html http://www.connfab.com/ash.html http://www.info.hotims.com/23933-8
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