These are DOE2.1E questions
Outdoor Air (OA) Control :
The Supply Air (SA) of a VAVS can vary due to varying envelope, lights and receptacle loads but the occupancy load can be fixed. So the minimum OA quantity must be fixed for VAVS based on peak zone occupancies or by user override. So how would you vary the OA quantity based on occupancy (using CO2 Sensors in Return Air) independently of the VAV Supply Air quantity?
Under-Floor Air Supply :
How can underfloor air supply be simulated in DOE2.1E? Since the space above 7 feet does not have to be maintained at 75 in summer or 72 in winter, the weighted average temp of the two layers (below and above 7 feet) can be used. How would you adjust the temp of the space above 7 feet be when the outdoor air temp varies from 0 to 100?
Section 6.1.3.3 (Ventilation Effectiveness Ev) in ASHRAE Std 62 says that the ventilation rates in the tables can be reduced depending on the effectiveness of the air supply, return and exhaust systems. The effectiveness of ventilation with under-floor supply is better than ceiling supply. What is the procedure for reducing the ventilation rate for under-floor supply relative to ceiling supply?
Hotel/Apartment HVAC :
An apartment in a high-rise building can be served simultaneously, using different operating profiles, by fan-coil units, outside air supply systems, toilet, kitchen and dryer exhausts and transfer make-up air from the corridor. There can be heat recovery between one or more of these separate exhaust systems and the outdoor air system.
An direct OA system to the space is not possible since, in DOE2.1E, the space can only be served by one system (FCU in this case). So the OA to the rooms is transferred from the 100% OA system serving the corridor. At the moment we find the weghted average (fraction) of all the exhaust systems and transfer OA from the Corridor's 100% OA System. Is there another way for modelling apartments and hotel rooms with DOE2.1E?
Varkie Thomas
Skidmore, Owings & Merrill
224 S. Michigan Ave.
Chicago, IL 60604
Tel: 312-360-4467 (direct)
Fax: 312-360-4545
Email: varkie.thomas@xxxxxxx
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