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2023-08-05 12:55:46 -0500 | received badge | ● Popular Question (source) |
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2016-09-20 18:37:08 -0500 | commented answer | Energy Plus Control Fan Pressure Thank you Archmage for the info. In that case, if changing the Fan Pressure Rise only changes the Fan Electric Power and Temperature Rise in the system, is there some other way to actually control or change the end static pressure, or pressure rise across the fan? Or some way to specify what the current fan speed should be? Or any method that will allow control of the fan in some fashion? |
2016-09-20 14:23:04 -0500 | received badge | ● Student (source) |
2016-09-20 14:14:49 -0500 | asked a question | Energy Plus Control Fan Pressure Howdy, I am trying to simulate an HVAC system in a building on which the the discharge air temperature and the end static pressure are the primary control setpoints. I started with the HVACTemplate:System:VAV object and have been working with the expanded idf. I have figured out how to control the discharge air temperature by using an EMS actuator on the AHU SUPPLY FAN OUTLET:System Node Setpoint:Temperature Setpoint and have been able to verify tracking of the setpoint with the Energy+ outputs. However, for the pressure setpoint I have tried to use an EMS actuator on AHU SUPPLY FAN:Fan:Fan Pressure Rise. I know there is the AHU SUPPLY FAN OUTLET:System Node Setpoint:Mass Flow Rate Setpoint, but I am not interested in controlling the mass flow rate. I wish to control the end static pressure of the AHU. I'm writing an external value to this actuator, but when viewing the results in the .csv file, I see no difference in pressures from the AHU MIXED AIR OUTLET:System Node Pressure to the AHU COOLING COIL OUTLET:System Node Pressure to the AHU SUPPLY FAN OUTLET:System Node Pressure. The values across all 3 are equal. I would like to verify that the fan pressure rise I am specifying is actually occurring. Are there other values I should be looking at? Is there another way to control the end static pressure of an AHU in Energy+? Thank you for your help! |