A refrigeration system for a temperature-controlled storage device includes a refrigeration circuit that circulates a refrigerant, a separate cooling circuit that circulates a coolant, and a controller. The refrigeration circuit includes a compressor, a condenser, an expansion device, and an evaporator. The cooling circuit includes a pump, a control valve, and a heat removing device in fluid communication with the condenser via the coolant. The controller is operatively coupled to the control valve and configured to identify a coolant temperature differential setpoint, monitor a temperature of the coolant provided to the condenser by the cooling circuit, calculate a coolant temperature differential based on the temperature of the coolant provided to the condenser, and operate the control valve to modulate a flow of the coolant through the condenser to drive the coolant temperature differential to the coolant temperature differential setpoint.

A vapor compression system that includes a reheat coil that heats a supply air stream flowing across the reheat coil with a refrigerant. A fan forces an environmental air flow across a condenser to remove energy from the refrigerant. A controller adjusts a speed of the fan to control a flow of the refrigerant through the reheat coil.

A heating, ventilation, and/or air conditioning (HVAC) unit includes a refrigerant circuit including a reheat coil and a condenser system, a first valve disposed along the refrigerant circuit and configured to modulate refrigerant flow to the reheat coil and to the condenser system, and a second valve disposed along the refrigerant circuit downstream of the first valve relative to a direction of the refrigerant flow through the refrigerant circuit. The condenser system includes a first condenser coil and a second condenser coil, and the second valve is configured to be actuated to control refrigerant flow to the second condenser coil.

A Variable Refrigerant Flow (VRF) dehumidification system. The system has at least one condenser module in fluid communication with one or more indoor air handlers. At least one evaporator coil is in fluid communication with the indoor air handlers and at least one reheat/reclaim coil. The evaporator and reheat/reclaim coils are also in communication with the condenser module. A plurality of electronic expansion valves (EEVs) are in fluid communication with the indoor air handlers. A plurality of sensors is disposed in the system and are in communication with at least one VRF dehumidification system controller. In one embodiment, a logic is stored in a non-transitory computer readable medium that, when executed by one or more processors, causes the VRF dehumidification system to monitor the data input from the plurality of sensors and regulates the capacity of the VRF dehumidification system needed to maintain a set dew point parameter.

An air-cooled chiller (100) includes a compressor (12); a cooler (14); a heat recovery heat exchanger (16), wherein the heat recovery heat exchanger is connected between an output of (12b) the compressor and an input header (20) of an air heat exchanger (60). A solenoid valve (30) is located in an input header (20) of the air heat exchanger to divide the input header into a first portion (20a) and a second portion (20b). A controller (32) is configured to control the solenoid valve (30). A second valve (34) is located in the output header (36) to divide the output header into a first portion (36a) and a second portion (36b). There is also provided a method of operating the air-cooled chiller and a method of retrofitting an existing serial-concept air cooled chiller, to provide the present air-cooled chiller.

A controller, a water source heat pump and a computer useable medium are disclosed herein. In one embodiment the controller includes: (1) an interface configured to receive operating data and monitoring data from the water source heat pump and transmit control signals to components of thereof and (2) a processor configured to respond to the operating data or the monitoring data by operating at least one motor-operated valve of the water source heat pump via a control signal.

Embodiments for fault diagnosis and analysis of refrigeration condenser systems by a processor. An energy usage anomaly is detected in a condenser by comparing an energy usage profile of the condenser against a knowledge domain of energy usage standards and energy usage standards anomalies.

A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.

A CO.sub.2 based refrigeration system and a method of operating the CO.sub.2 based refrigeration system. The system includes a condenser configured to transfer heat from a CO.sub.2 refrigerant of the refrigeration system to an air stream. The system also includes an indirect evaporative cooler arranged to cool an ambient air stream without changing its moisture content and to supply the cooled ambient air to the condenser to facilitate the transfer of heat from the CO.sub.2 refrigerant.

A heating, ventilation, and/or air conditioning (HVAC) system includes a condenser section and a plurality of panels configured to abut one another in a common plane to form a divider panel assembly. Each panel of the plurality of panels is sequentially insertable into and removable from the condenser section.