Abstract:
A coolant pipe (3, 23) extends on the evaporator plate (1) of a roll bond evaporator. Said coolant pipe (3, 23) has a first connection point (2, 19) on an edge of the evaporator plate (1) and a constriction (4) that adjoins the connection point (2, 19). A section of the coolant pipe (3, 23) extending across the constriction (4) is delimited by branches (6, 7, 22, 24) on both sides. The evaporator plate (1) has a second connection point (8, 20) which is separate from the first connection point (2, 19).
Abstract:
A compression machine includes a refrigerant condenser, an expansion device, a refrigerant evaporator, a first compressor and a second compressor. Each compressor is arranged to receive lower pressure refrigerant vapor from the evaporator and to deliver higher pressure vapor to the condenser independently of the other compressor. The first compressor operates when the compression machine is operating in a first duty mode, for example a water-cooling mode. The second compressor operates when the compression machine is operating in a second duty mode, for example one of a water-heating mode or a brine cooling. The first compressor is selected for optimal performance in the first duty only and the second compressor is selected for optimal performance in the second duty mode only.
Abstract:
A hot gas defrost process is disclosed for defrosting an evaporator of a refrigeration system. In an exemplary embodiment, the hot gas defrost process includes the step of flooding at least one evaporator to be defrosted with liquid refrigerant prior to supplying a hot refrigerant vapor to the liquid flooded evaporator. In an exemplary embodiment, the hot gas process includes the step of suctioning down the refrigeration pressure within the evaporator upon termination of the supplying of the hot refrigerant vapor to the evaporator being defrosted.
Abstract:
A refrigeration system (20A) comprises an evaporator (27), a two-stage compressor (32) for compressing a refrigerant, a second compressor (34) for compressing the refrigerant, a heat rejecting heat exchanger (24) for cooling the refrigerant, a first economizer circuit (25A), and a second economizer circuit (25B). The first economizer circuit (25A) is configured to inject refrigerant into an interstage port (48) of the two-stage compressor (32). The second economizer circuit (25B) is connected to the second compressor (34).
Abstract:
An apparatus for refrigeration system control includes a plurality of circuits, each circuit having at least one refrigeration case and an electronic evaporator pressure regulator in communication with each circuit. Each electronic evaporator pressure regulator controls a temperature of one of the circuits. A sensor in communication with each circuit measures a parameter from the circuit. A controller associated with each electronic evaporator pressure regulator controls the respective electronic evaporator pressure regulator based upon measured parameters from each of the circuits.
Abstract:
A system has a number of parallel flowpath segments between a compressor and an evaporator. One or more valves selectively block and unblock at least one of the segments to provide capacity control.
Abstract:
A system includes a plurality of distributed refrigeration units respectively coupled to discrete refrigeration circuits. Each refrigeration unit may include a variable compressor, a fixed compressor, a condensing unit, and a controller. The controller compares an operating condition of the refrigeration unit to a refrigeration circuit set point to select a compressor staging capable of achieving the refrigeration circuit set point.
Abstract:
A method of monitoring the food product and refrigeration system performance of a remote location (14) includes a management center (12) in communication with a remote location through a communication network (16). The management center (12) receives performance information of the refrigeration system at the remote location (14) and employs software modules (22) to analyze the performance information, diagnose system conditions, and provide alarms for food safety issues, refrigeration system component failure, and indicate maintenance conditions.
Abstract:
A system (10) is provided for monitoring the food product of a remote food product retailer (14) . The system includes a manageme nt center (12) in commucation with the remote food product retailer (14) via a communication network (18). The communication network (18) is accessible via a user interface (24) that may be located at any of the management center(12), the remote location (14) or some other location. The management center (12) gathers food product temperature information and uses that inforamtion to determine whether hte shelved food product is within acceptable food safety and quality limits. If the food product exceeds these limits, an alarm is sounded at either the management center (12) and a remote location(14).The user interface (24) is operable to monitor t he status of the food product via a selection of screens and remotely respond to the alarms.
Abstract:
A freezer (1) comprising a plurality of utilization−side heat exchangers (41, 45, 51) such as for air conditioning and refrigeration·freezing purposes, a 4−way switching valve (3C) and a plurality of check valves (7) disposed on the suction side of a compression mechanism (2D, 2E) composed of three compressors (2A, 2B, 2C) so as to switch the operating state, wherein the compressors (2A, 2B, 2C) used on the air conditioning side and on the refrigeration·freezing side are respectively limited in number to two at a maximum, thereby simplifying the circuit arrangement with the check valves (7) on the suction side of the compression mechanism (2D, 2E) reduced in number to one or two, thus preventing the generation of sound due to chattering in the check valves (7) and also preventing a decrease in performance due to a pressure loss on the suction side.