A method of minimizing components of a heating, ventilation, and air conditioning (HVAC) system from malfunctioning, the method includes measuring, by an accelerometer associated with at least one component of the HVAC system, vibration of the at least one component and receiving, by a controller, actual vibration data reflective of the measured vibration. The method further includes determining, using the controller, whether the actual vibration data is greater than pre-defined acceptable baseline vibration data by more than a pre-defined acceptable amount and responsive to a positive determination in the determining step, adding, by the controller, as a deadband frequency, an operational frequency of the at least one component corresponding to the actual vibration data.

The present disclosure concerns a device and a method for chiller station management for providing chilled water to a load (30), a computer storage medium and a chiller station. The method for chiller station management includes: determining whether a chiller (10) with a low load exists in a chiller station and determining whether to allow to shut down one chiller (10) in the chiller station, when a certain chiller (10) in the chiller station transmits a surge risk signal; if yes, shutting down one chiller (10) in the chiller station to increase loads of other chillers (10); and if no, raising a chiller (10) outlet water temperature in the chiller station and/or lowering a cooling tower (20) outlet water temperature in the chiller station. The device and method for chiller station management according to the present disclosure provide a surge protection at a chiller station level, thereby effectively avoiding occurrence of surge in the chiller, and improving the efficiency and operation stability of the chiller station.

There is disclosed a refrigeration system comprising a refrigeration circuit that includes a compressor, a condenser, an expansion valve and an evaporator. A condenser fan of the refrigeration system is configured to operate, under the control of a controller, at a condenser fan speed that is set based on a current refrigeration demand on the system.

A cooling device comprises a storehouse having an opening, a door to open and close the opening, and a cooling unit to cool the interior of the storehouse. The cooling unit has a compressor, a condenser, a blower device to blow air to the condenser and the compressor, and a frame pipe. The frame pipe is disposed near the opening and refrigerant, that has been discharged from the compressor but has not reached the condenser, flows therein. The amount of air flow from the blower device is reduced as the interior temperature, which is the temperature inside the storehouse, gets lower or as the elapsed time, which is the time from when the compressor starts operation, becomes longer. The reduction of air flow from the blower device includes stopping the air flow from the blower device.

An exemplary compressor system includes a compressor having a fluid inlet and a fluid outlet. An isolation valve connects the fluid outlet of the compressor to a condenser. A controller is communicatively coupled to the isolation valve and the compressor. The controller includes a memory storing instructions configured to cause the controller to detect one of a surge event and a surge event precursor and restrict an opening in the isolation valve in response.

A CO2 refrigeration system can include a condenser, multiple fans, and a controller. The condenser can be configured to cool CO2 and the multiple fans can be configured to affect cooling operations of the condenser. The controller may be configured to obtain a temperature value of CO2 output by the condenser. The controller may be configured to determine if the condenser is operating properly using the temperature value of the CO2. The controller may be configured to obtain values of input current and input voltage provided to the multiple fans. The controller can determine a number of in-operational or faulty fans of the multiple fans using, at least in part, the values of the input current and the input voltage and a model that relates input current to input voltage for known numbers of in-operational or faulty fans.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, a secondary condenser, a modulating valve, and an alternate condenser. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a dehumidified airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the modulating valve. The modulating valve directs the flow of refrigerant to the primary condenser and to the alternate condenser. The alternate condenser receives a portion of the flow of refrigerant for heat rejection, where the primary condenser receives the remaining portion of the flow of refrigerant.

In various implementations, a heat exchanger system may include one or more flow paths. At least one of the flow paths may be associated with more than one pass and/or fluid flow through the flow path may be restricted. A setting of the heat exchanger system may include associations between flow path(s) and/or pass(es). A setting for the heat exchanger system may be determined, and the heat exchanger system may be allowed to operate in the determined setting, in some implementations.

A vapor compression system includes a first conduit fluidly coupling a liquid collection portion of a condenser and an evaporator, where the first conduit is configured to direct a first flow of refrigerant from the condenser to a first inlet of the evaporator and a second conduit fluidly coupling the liquid collection portion of the condenser and the evaporator, where the second conduit is configured to direct a second flow of refrigerant from the condenser to a second inlet of the evaporator via gravitational force, and where the first inlet is disposed above the second inlet relative to a vertical dimension of the evaporator.

A system and method for positioning a slider of a reversing valve. A method includes receiving a command for operating a reversing valve in a first mode, a second mode or a third mode. The reversing valve comprises a first tube, a second tube, a third tube, and a fourth tube. The method further describes determining a tonnage profile for refrigerant to flow in the reversing valve. The method further describes communicating the command and the tonnage profile to a stepper motor and linearly moving a lead screw based on the command and the tonnage profile to position a slider on the second tube and the third tube in the second mode and the third mode or on the third tube and the fourth tube in the first mode.