A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a building includes a monitoring device installed at the building, a monitoring server located remotely from the building, and a review server. The monitoring device measures an aggregate current supplied to components of the HVAC system and transmits current data based on the measured aggregate current. The monitoring server receives the transmitted current data and, based on the received current data, assesses whether failures have occurred in first and second components of the HVAC components. The monitoring server generates a first advisory in response to determining that the failure has occurred in the first component. The review server provides the first advisory to a technician for review and, in response to the technician verifying that the failure has occurred, transmits a first alert.

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Hvac system remote monitoring and diagnosis

A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a residence includes a monitoring device installed at the residence and a server located remotely from the residence. The monitoring device measures an aggregate current supplied to a plurality of components of the HVAC system and transmits current data based on the measured aggregate current. The server receives the transmitted current data and, based on the received current, assesses whether a failure has occurred in a first component of the plurality of components of the HVAC system and assesses whether a failure has occurred in a second component of the plurality of components of the HVAC system.

Residential solutions hvac monitoring and diagnosis

An environmental control system for conditioning air in a vehicle compartment, such as an aircraft cabin. Cool expanded higher-pressure air from a turbine is mixed with recirculated warmer, lower pressure air from the compartment. The air is mixed and recirculated by a jet pump which includes an inlet section, an outlet section, a diffuser section and a mixing section. The mixing section includes a plurality of separate mixing chambers. The diffuser section includes diffusers for receiving mixed gases from each of the mixing chambers. The outlet section receives the mixed gases which are then conveyed to the compartment. The inlet section includes for each of the mixing chambers, a primary nozzle for introducing the higher-pressure air into a respective mixing chamber, and a secondary nozzle for introducing the lower pressure air to a respective mixing chamber.

Environmental control system

A method and apparatus for controllable distribution of power from a turbine of a gas turbine engine between two rotatable loads of the gas turbine engine, comprises transferring a shaft power of the turbine to the respective rotatable loads using differential gearing operatively coupled with the turbine and the rotatable loads, respectively; and controlling the power transfer using machines operatively coupled with the respective rotatable loads, operable as a generator or a motor for selectively taking power from one of the rotatable loads to drive the other of the rotatable loads, or the reverse.

Differential geared turbine engine with torque modulation capability

A microprocessor-based air conditioning/refrigeration control system (76) adapted for use with a variable speed compressor (12) measures acceleration (N1) of the compressor and the temperature (T2) or pressure (P2) of the refrigerant exiting therefrom, determines the rate of change of the temperature or pressure of the refrigerant, and decreases acceleration of the compressor if the rate of change of the temperature or pressure of the working fluid indicates surging of the compressor. Superheat (T1, P1) of the refrigerant is maintained at a first predefined level while the compressor is operating at constant speed (N1) and is increased to a second, higher predefined level while the compressor is accelerating. The system is able to diagnose deterioration of the compressor by measuring and comparing power input (V,A) to the compressor and rate of change of temperature (T2) or pressure (P2) of the refrigerant at the compressor between initial and subsequent periods, and differentiate between deterioration of a drive component or a pressurizing component of the compressor.

Control system for an air conditioning/refrigeration system

A variable speed drive motor system is disclosed. The motor system is particularly suitable for use as a drive system for a centrifugal compressor in a refrigeration system. The motor system includes an AC auxiliary motor/generator with inverter control. The motor/generator is interconnected through a transmission system to a main motor to drive an output drive shaft at varying speeds. Preferably, the interconnecting transmission system is an epicyclic gear system.

Variable speed drive motor system with inverter control

A microcomputer system and method for controlling the capacity of a refrigeration system are disclosed. The microcomputer system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. The microcomputer system processes these input signals to generate a control signal which is a step function of the temperature difference between a desired set point temperature and the sensed temperature of a heat transfer fluid cooled by operation of the refrigeration system. The width of each step of the step function is directly proportional to a selected capacity control response factor. By selecting different capacity control response factors, capacity control of the refrigeration system is tailored to meet specific job requirements of a particular job application for the refrigeration system.

Microcomputer system for controlling the capacity of a refrigeration system

A vaned diffuser for a centrifugal compressor has provision for selectively adjusting the pitch of the vanes in order to accommodate variable load conditions. Each of the vanes is rotatable about a pivot pin near its leading edge and is engaged with an actuation member near its trailing edge. The actuation members are attached to a common ring which can be selectively rotated to move to the vanes in unison. The ring is supported by rollers at its outer periphery and is positioned at the outer periphery of a diffuser wall such that there is no forward facing step projecting into the flow stream.

Rotating vane diffuser for a centrifugal compressor

A labyrinth seal (62) is provided to isolate the transmission chamber (30) from a balance piston (59) of a centrifugal com­pressor, the labyrinth seal (62) being pressurized with re­frigerant vapor from the motor chamber, which vapor is at a pressure slightly above that in the transmission, to thereby minimize the efficiency losses that would otherwise occur from leakage of the vapor into the transmission and to the compressor suction (60).

Balance piston and seal arrangement

A protective capacity control system and method for controlling the capacity of a refrigeration system are disclosed. The protective capacity control system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. These input signals are processed to generate a control signal which is a step function, preferably having two steps, of the temperature difference between a desired set point temperature and the sensed temperature of a heat transfer fluid cooled by operation of the refrigeration system. The capacity of the refrigeration system is reduced at a first effective overall rate to provide capacity control which will reduce hunting by the capacity control system when the sensed temperature of the heat transfer fluid cooled by operation of the refrigeration system is less than a lower limit of a selected temperature deadband relative to the desired set point temperature. The capacity of the refrigeration system is reduced at a second effective overall rate, greater than the first effective overall rate, when the sensed temperature of the heat transfer fluid cooled by operation of the refrigeration system is less than a second, predetermined temperature limit which is less than the lower limit of the selected temperature deadband relative to the set point temperature to prevent freezing of the heat transfer fluid cooled by operation of the refrigeration system.

Zinsmeyer Thomas M

Papers

Variable speed drive motor system with inverter control

Microcomputer system for controlling the capacity of a refrigeration system

Rotating vane diffuser for a centrifugal compressor

Balance piston and seal arrangement

Protective capacity control system for a refrigeration system