A method of assembling a refrigeration unit includes inserting a machine compartment assembly, including a base plate and a compressor coupled to the base plate, into a machine compartment of the refrigeration unit, mounting a control box of the refrigeration unit to a side panel, and coupling the side panel to the refrigeration unit, such that the side panel conceals a lateral side of the machine compartment and the control box is laterally-inboard of the side panel.

An apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system includes motorized valves on condenser coil inlets, a main compressor discharge motorized valve, a bypass pressure regulator valve in the main compressor piping, and check valves on the condenser outlets. The condenser inlet motorized valves provide precise control of gas feed to the condensers, so pressure can build without collapsing oil pressure. The condenser outlet contains check valves to prevent liquid backflow during coil isolation. The compressor discharge line contains a motorized valve for regulating discharge pressure at start-up. The motorized valve in the compressor discharge piping includes a bypass with a pressure regulator for precise regulation at minimum discharge pressure. Once discharge pressure rises above the setpoint, the condenser inlet solenoid coils open one at a time. The discharge pressure regulating motorized valve simultaneously regulates the discharge pressure until the condenser maintains discharge pressure.

The present invention provides a cold end heat exchanging device, which comprises: a cold end heat exchanging part which defines an inner cavity or pipeline for containing a refrigerant existing in both gas and liquid phases; and a plurality of refrigerant pipelines, each provided with: an evaporation section which is downwardly bent and extends in a vertical plane and has a closed tail end, and a connection section which is upwardly bent and extends from a starting end of the evaporation section and is connected to the inner cavity or pipeline; wherein the evaporation sections of at least some refrigerant pipelines are arranged in two vertical planes perpendicular to each other. The present invention further provides a semiconductor refrigerator having the cold end heat exchanging device. The cold dissipation efficiency of the cold end heat exchanging device and the energy efficiency of the semiconductor refrigerator are significantly improved.

A refrigeration system has: (a) a fluid tight circulation loop including a compressor, a condenser and an evaporator, the evaporator having at least three evaporator zones, each evaporator zone having an inlet port, the circulation loop being further configured to measure the condition of the refrigerant with a refrigerant condition sensor disposed within the evaporator upstream of the evaporator outlet port; and control the flow of refrigerant to the evaporator based upon the measured condition of the refrigerant within the evaporator, and (b) a controller for controlling the flow rate of refrigerant to the evaporator based upon the measured condition of the refrigerant within the evaporator upstream of the evaporator outlet port.

In one aspect, a refrigeration system is provided. The refrigeration system includes a compressor coupled to a variable frequency drive (VFD), a condenser, an evaporator, an oil separator, and an oil conditioning circuit. The oil conditioning circuit is thermally coupled to the VFD and configured to heat oil from the oil separator with heat produced by the VFD.

The present invention relates to an apparatus and a method for evaporating liquids containing potentially explosive impurities of lower volatility than the actual liquid compound. The set-up of the evaporator according to the invention allows its operation with complete evaporation of a liquid without formation of a liquid sump of not yet evaporated liquid.

A refrigerator may include a cabinet defining a low-temperature storage space and a machine chamber in which a compressor and a condenser are disposed; and an evaporator disposed in rear of the storage space, wherein air flows upwards along the evaporator and thus cools down to lower a temperature of the storage space. The evaporator may include a cooling pipe in and along which refrigerant flows; and a plurality of cooling fins surrounding an outer face of the cooling pipe. The cooling pipe may be constructed so that the refrigerant flows downward along and in the cooling pipe.

An absorption refrigeration and air conditioning device capable of controlling temperature and/or the humidity of enclosed spaces particularly useful in maritime applications and improving fuel economy of internal combustion engines is provided.

A refrigeration appliance includes an inner space, an evaporator assembly extending at a wall of the inner space, a retaining device including a base plate extending between the wall and the evaporator assembly, and protrusions protruding from the wall on a first and a second edge of the base plate. At least the protrusion protruding on the first edge includes an elastic clip that can be deflected out of a position in which it engages with a first outer section of the evaporator assembly into a position in which it releases the outer section. A method for mounting an evaporator assembly on a wall of an inner space of a refrigeration appliance is also provided.

A method of mitigating a freeze event in an HVAC system includes measuring a saturated suction temperature, receiving actual temperature value reflective of the measured saturated suction temperature, determining whether the actual temperature value is less than a first pre-determined minimum threshold temperature value, and responsive to a determination that the actual temperature value is less than the first pre-determined minimum threshold temperature value, initiating a timer to operate for a pre-determined time interval. Determining whether the actual temperature value is less than a second pre-determined minimum threshold temperature value. Responsive to a determination that the actual temperature value is less the second pre-determined minimum threshold temperature value, initiating the timer to operate for a modified time interval, determining whether the timer operating for the modified time interval has expired, and responsive to a determination that the timer has expired, modifying operation of a compressor.