In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.

An evaporator system includes an evaporator chamber 28 having one or more heat exchanger tubes 4 passing therethrough for transmitting a fluid to be cooled through the evaporator chamber 28; and a refrigerant separator configured to separate a two-phase refrigerant into refrigerant vapour and liquid refrigerant, and having a first outlet 32 for the separated vapour refrigerant and a second outlet 30 for the separated liquid refrigerant; the first outlet 32 is arranged for supplying the vapour refrigerant into the evaporator chamber 28 at a location above at least some of the heat exchanger tubes 4, and the second outlet 30 is arranged for supplying the liquid refrigerant into the evaporator chamber 28 at a location below at least some of the heat exchanger tubes 4.

A heat exchanger includes: a gas-refrigerant pipe; a header connected to the gas-refrigerant pipe; and heat transfer tubes connected to the header. The header includes: a first plate member; and a second plate member that is stacked on the first plate member in a plate-thickness direction. The first plate member includes a first opening that constitutes an internal space of the header. The second plate member includes a second opening that, together with the first opening, constitutes the internal space of the header. The internal space of the header communicates with the heat transfer tubes. A first direction is perpendicular to both the plate-thickness direction and a direction in which the heat transfer tubes are arranged. A width of a part of the first opening in the first direction is different from a width of the second opening in the first direction.

A refrigeration unit having an evaporator tube, a heater tube in a spaced relationship with the evaporator tube, a wire that couples the evaporator tube to the heater tube, and a bracket having a first panel configured to contact the heater tube and a second panel that defines a recess configured to receive the heater tube therein.

Disclosed is an evaporator header insert, including: a header insert body that extends along a body center axis between body inlet and outlet ends, a center passage located within the header insert body, the center passage extending from the body inlet end to the body outlet end along the body center axis, the center passage surface defining: a center passage inlet portion at the body inlet end; a center passage outlet portion, at the body outlet end, that defines a body nozzle portion on the body center axis, wherein the body nozzle portion has a convergent-divergent shape so that the body nozzle portion has a convergent segment, a divergent segment and a neck segment therebetween; and a conical tip member, fixed to the body outlet end and disposed at least partially within the divergent segment of the body nozzle portion so that a conical outlet passage is formed therebetween.

A refrigeration cabinet includes a freezing compartment, a first evaporator and a second evaporator. The freezing compartment includes a freezing compartment door, and the first evaporator and the second evaporator are both equipped in the freezing compartment. The first evaporator is turned off and a second evaporator is working while the freezing compartment door is opened.

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.

An evaporator coil system includes a segmented evaporator coil. The segmented evaporator coil includes a primary segment and a secondary segment. A first plurality of evaporator circuit lines are fluidly coupled to the primary segment and a second plurality of evaporator circuit lines are fluidly coupled to the secondary segment. A suction line includes a first connection fluidly coupled to the primary segment and a second connection fluidly coupled to the secondary segment. A valve is arranged in fluid communication with the secondary segment so as to selectively restrict refrigerant flow through the secondary segment.

A multi-head single-pass sectional compression water chilling device includes a combined condenser and a combined evaporator. The combined condenser is formed by sequentially connecting and combining a plurality of sectional condensers, the combined condenser is internally provided with a condenser tube bundle for use by all the sectional condensers, the combined evaporator is formed by sequentially connecting and combining a plurality of sectional evaporators, the combined evaporator is internally provided with an evaporator tube bundle for use by all the sectional evaporators, the sectional condensers and the sectional evaporators are in one-to-one correspondence, a compressor is connected between each sectional condenser and a corresponding one of the sectional evaporators, and the compressor, the sectional condenser and the corresponding sectional evaporator form a refrigeration function section.

The evaporation unit structure of a heat transport member that is an evaporation unit structure of the heat transport member in which a container including an internal space in which the working fluid is enclosed includes an evaporation unit in which the working fluid in a liquid phase changes in phase, and a condensation unit in which the working fluid in a gas phase changes in phase, wherein a sintered body layer is provided on an inner surface of the evaporation unit, the sintered body layer with an average thickness n is composed of a first site that is a region of n/2 on an inner surface side of the container, and a second site that is a region of n/2 on the internal space side, and a percentage of voids of the first site is less than a percentage of voids of the second site.