TECHNICAL FEATURE Equipment Integration * Are units interlocked with each other per the required sequence of operations in order to maintain adequate IEQ and building balance? * Are units serving the same space operating in such a way that prevents them from simultaneously heating and cooling? Remote Support * Can required system changes be implemented remotely in order to eliminate service visit costs? FIGURE 6 Space dry-bulb and dew-point temperatures over a period of approximately 18 hours. Data 80°F 75°F 70°F 65°F 60°F 55°F 50°F Alerts 2a 4a 6a 8a 10a 12p 2p 4p 6p 8p 10p Space (Temperature) Space Dew-Point (Temperature) Optimization of Standard Designs 65 65 35 68 ashrae.org FEBRUARY 2020 70 72 Temperature (°F) 74 50 45 40 35 76 Humidity Setpoint 68 A 70 72 Temperature (°F) 74 76 74 76 B 65 65 Humidity Setpoint 60 45 40 Cooling Setpoint Humidity Setpoint 50 35 68 70 72 Temperature (°F) C 74 76 55 50 45 40 35 Humidity Setpoint Humidity Setpoint 55 Humidity (Dew-Point °F) 60 68 Cooling Setpoint 40 Cooling Setpoint 45 55 Cooling Setpoint 50 Service and support groups benefit greatly from connected commissioning. Having remote access to systems' operating data greatly simplifies the troubleshooting process. For example, a qualified service technician or ASHRAE JOURNAL Humidity (Dew-Point °F) 55 Service and Support Group Benefits 26 60 Humidity Setpoint Humidity Setpoint 60 Humidity Setpoint * Are modulating units saving energy at part-load conditions? Figure 8 shows the performance of a DOAS unit during a three-month seasonal transition period (late February to early May). The unit displayed a relatively low average compressor speed, which is an indicator of the unit's ability to reduce energy consumption at part load conditions. Likewise, space conditions were within the setpoints the majority of the time. A high average compressor speed during off-peak seasons or poor space conditions could be indicators of system inefficiencies or HVAC design problems. Darker = More Time Spent at Space Condition Humidity (Dew-Point °F) Part-Load Performance FIGURE 7 Humidity and space temperature distribution for various applications. (A) restaurant dining area; (B) laboratory; (C) hotel corridor; and (D) elementary school. Humidity (Dew-Point °F) * Are units selected for prototypical designs oversized or undersized based on their historical performance? * Are energy recovery devices and associated equipment capacities sized appropriately? * Can standard building designs that use traditional RTUs benefit from switching to DOAS? 70 72 Temperature (°F) D engineer can remotely view the operating data of units and determine if unit settings are optimally set to provide the desired performance. In addition, these settings can be adjusted remotely, and the support team can view instant feedback of the results. This flow ofhttps://www.ashrae.org/