| 主权项 |
1. A method of controlling the air flow of an HVAC system for a multi-story building having a lobby level with an occupant entrance and one or more additional levels above and/or below the lobby level, the HVAC system including a heating and air conditioning system for supplying conditioned air to the building, and a return air path for removing air from the building, the return air path including a recirculate output for delivering return air to the conditioning system, and a relief output for exhausting return air to the atmosphere surrounding the building, the method comprising:
a. measuring a pressure differential between the building air and atmosphere air at a sensor location, b. computing a desired pressure differential between the building air and atmosphere air at the sensor location, based upon a height difference between the sensor location and the lobby level, and a computed stack effect pressure that is expected to develop at the sensor location on the building when a desired pressure difference is present at the lobby level for a current inside and outside air temperature in the absence of mechanical action, and c. controlling the return air path to pressurize the air in the sensor location to produce the desired pressure differential between the building air and atmosphere air at the sensor location. |
