A method of controlling a Heating, Ventilating and Air Conditioning (HVAC) system including a fluid transportation network that includes one or more network sections, each network section being connected to a fluid transportation circuit through respective supply lines and return lines, each network section including plural parallel zones, includes arranging a pressure regulating device in the supply lines and/or respective return lines of the network sections, arranging flow regulating devices in the zones of the network sections, measuring a remote differential pressure of the fluid in a first zone of the plurality of zones of each of the network sections, and controlling, by a controller, the pressure regulating devices of each network section to maintain the measured remote differential pressure within a specified differential pressure range.

An air system includes an enclosure. A compressor, a first energy exchange device, an expansion device, and a second energy exchange device are each positioned in or along the enclosure and connected in a closed refrigerant loop. A first inlet receives air being psychrometrically controlled in the enclosure from a first source. A first outlet removes the psychrometrically controlled air from the enclosure. A second inlet receives air being non-psychrometrically controlled in the enclosure from a second source. A second outlet removes the non-psychrometrically controlled air from the enclosure. A third energy exchange device positioned in or along the enclosure exchanges energy between the psychrometrically controlled air and the non-psychrometrically controlled air. The enclosure is adapted for insertion through an opening having opposed parallel sides having a dimension of 36 inches or less.

A cooling system including a ventilator that exchanges atmosphere between parts of a building that are at differing heights. The ventilator includes an outer conduit that extends from an upper end thereof downward to a lower end thereof. An inner conduit extends substantially the entire length of the outer conduit. Both the outer and inner conduits are open at their respective upper ends and lower ends. Temperatures of atmosphere both surrounding and within the outer conduit and the inner conduit induce an exchange of atmosphere between the ventilator and surrounding atmosphere.

The air flow of an HVAC system for a multi-story building B is controlled by optimizing the pressure setpoint at the return air plenum PL-1 used for removing or recirculate air from the building, by measuring a pressure differential between the building B air and atmosphere A air at a sensor location P-2, computing a desired pressure differential between the building B air and atmosphere A air, based upon a computed stack effect pressure that is expected to develop at the sensor location on the building for the current inside and outside air temperature in the absence of mechanical action, and controlling the return air fan and damper D-1 to pressurize the air in at the sensor location to produce the desired pressure differential between the building B air and atmosphere A air at the sensor P-2 location. Air pressure is also controlled between specific rooms and adjacent rooms by control of the conditioned air or return air paths connected thereto.

An apparatus includes a processor and a blower drive. The processor receives an altitude and a first blower coefficient. The processor determines a second blower coefficient based on the first blower coefficient and the altitude. The blower drive receives the second blower coefficient and adjusts at least one of a speed and a torque of a motor based on the second blower coefficient.

An object is to provide a refrigeration cycle apparatus that does not cause unevenness of capacity among branch units and a failure in controlling a refrigerant circuit. At least one of branch units is a first branch unit having a minimum pressure loss in distribution of refrigerant in a high-pressure refrigerant pipe between a heat source unit and the branch units, and at least another one of the branch units is a second branch unit having a maximum pressure loss in distribution of refrigerant in the high-pressure refrigerant pipe between the heat source unit and the branch units. An opening degree of an expansion device is controlled in such a manner that a differential pressure between a refrigerant pressure detected by a high-pressure detecting device of the first branch unit and a refrigerant pressure detected by an intermediate-pressure detecting device is greater than or equal to a set value PHM.

A heating and cooling system for use in high-rise residential and commercial buildings may include a condensing unit having dimensions no greater than 12 inches deep by 40 inches wide by 20 inches tall and a fan coil unit coupled to the condensing unit via refrigeration tubing. The fan coil unit may have dimensions of no greater than 14 inches deep by 43 inches wide by 11 inches tall. The condensing unit may include a condenser water connection, a refrigeration tubing connection, a compressor, and a heat exchanger. The fan coil unit may include a filter rack configured to hold a MERV 13 filter, two in-line high-pressure fans, and at least one access panel on a bottom surface of the fan coil unit.

An HVAC controller may be programmed to initiate a delta T test in response to a request received from a user. The user may initiate the delta T test at the HVAC controller or via a remote device. In some cases, the HVAC controller may be configured to automatically execute a delta T test for each valid equipment stage combination of the HVAC system without receiving further input from the user and to determine both a run time and a stabilized delta T parameter value for each equipment stage combination. The HVAC controller may also record the delta T parameter value and run time for each test in the memory of the HVAC controller. The HVAC controller may be further configured to notify the user when testing for each/all equipment stage combination is complete.

An integrated air conditioning and elevator system of a building is provided. The system includes an air handling unit having a variable speed fan, a first elevator shaft configured to span a plurality of floors in the building, and a plurality of first dedicated variable speed fans located within the first elevator shaft, wherein one of the plurality of first variable speed fans is located at each of the plurality of floors and configured to fluidly connect the first elevator shaft with the respective floor of the plurality of floors. The variable speed fan of the air handling unit is configured to convey air to or from the first elevator shaft and each of the plurality of first variable speed fans is configured to convey air between the respective floor of the plurality of floors and the first elevator shaft.

Determining building weather profile parameters, and correcting an estimated altitude of a receiver using the building weather profile parameters. Systems and methods for estimating an altitude of a receiver using building weather profile parameters may identify one or more weather profile parameters for a building, determine an initial estimate of a receiver's altitude at a floor inside the building, and use the initial estimate and the identified weather profile parameters to determine a corrected estimate of the receiver's altitude at the floor.