A system for deicing the external evaporator in a heat pump system, includes a refrigeration circuit connected in input and in output to the heat pump system and adapted to convey coolant gas. The refrigeration circuit includes a tank for storing a deicing fluid, and a first heat exchanger immersed in the deicing fluid. The system further includes a deicing circuit connected in input and in output to the tank and adapted to convey the deicing fluid. The deicing circuit includes a second heat exchanger arranged proximate to the external evaporator.

A bulb (5) for a thermostatic expansion valve is provided, said bulb (5) comprising a chamber (7), said chamber (7) being located within a metallic casing of said bulb and being filled with a filling adapted to influence a valve element of said thermostatic expansion valve. Service of a temperature controlled valve connected to a bulb should be facilitated. To this end said bulb (5) comprises a connection geometry (10) adapted to be connected to a capillary member (6) and said casing being provided with a closed opening zone located within said connection geometry (10), said opening zone being adapted to be opened upon mounting a counterpart (15) to said connection geometry (10).

An HVAC system having a fixed orifice expansion device coupled to an evaporator coil is provided. In one embodiment, an expansion device coupled to an evaporator coil includes a flow restrictor and an evaporator inlet manifold. The flow restrictor includes multiple fixed orifices aligned with the refrigerant distribution tubes to restrict flow of refrigerant from the evaporator inlet manifold into the refrigerant distribution tubes through the multiple fixed orifices. Additional systems, devices, and methods are also disclosed.

A refrigeration system includes an evaporator, a condenser, a compressor, a capillary tube, and an expansion device. The compressor is configured to circulate a refrigerant between the evaporator and the condenser. The capillary tube is configured to receive the refrigerant from the condenser. The expansion device is configured to receive the refrigerant from the capillary tube and provide the refrigerant to the evaporator. The expansion device is adjustable to control a flow of the refrigerant through the capillary tube.

A cooling system includes a subcooling heat exchange assembly, which controls magnitude of subcooling of refrigerant circulated through the cooling system. The subcooling heat exchange assembly includes a first fluid line fluidly coupled to an output of a condenser to enable a first portion of the refrigerant output from the condenser to flow through the first fluid line; a second fluid line fluidly coupled to the output of the condenser to enable a second portion of the refrigerant output from the condenser to flow through the second fluid line; and an expansion valve disposed along the second fluid line, in which the expansion valve exerts a first pressure drop on the second portion of the refrigerant that facilitates extracting heat from the first portion of the refrigerant flowing through the first fluid line using the second portion of the refrigerant flowing through the second fluid line when valve position of the expansion valve is greater than a threshold position. Additionally the cooling system includes a plurality of capillary expansion tubes fluidly coupled in parallel to an output of the first fluid line and that to exert a second pressure drop on the refrigerant circulated through the cooling system.

A cooling system includes an expansion valve configured to exert a first pressure drop on refrigerant circulated through the cooling system. The cooling system also includes a plurality of capillary expansion tubes fluidly coupled in parallel to an output of the expansion valve and configured to exert a second pressure drop on the refrigerant circulated through the cooling system. The cooling system also includes a controller communicatively coupled to the expansion valve, wherein the controller is configured to control magnitude of the first pressure drop by instructing the expansion valve to adjust the valve position based at least in part on refrigerant mass flow expected to be supplied to the expansion valve to facilitate substantially uniformly distributing the refrigerant mass flow between each of the plurality capillary expansion tubes.

A control method of a refrigerator includes: determining whether a first temperature of a refrigerating compartment satisfies a first temperature condition; based the first temperature satisfying the first temperature condition, determining whether a second temperature of a freezing compartment satisfies a second temperature condition; based on the second temperature satisfying the second temperature condition, determining (i) whether a third temperature of an ice making compartment satisfies a third temperature condition and (ii) whether a driving time for ice making has passed; maintaining operation of a compressor while determining (i) whether the second temperature satisfies the second temperature condition, (ii) whether the third temperature satisfies the third temperature condition, and (iii) whether the driving time has passed; and stopping operation of the compressor based on at least one of (i) a determination that the third temperature satisfies the third temperature condition or (ii) a determination that the driving time has passed.

A valve structure that may control the flow rate of a fluid with high precision when the fluid starts to be released is provided. In a valve structure 20 including a valve sheet 3 having two outlets 3a to release a fluid and a valve body 4 arranged to be rotational against the valve sheet 3 to regulate a degree of opening of the outlet 3a, the valve body 4 has a fluid control recess 4d formed in the circumferential direction whose area overlapping the outlet 3a is changed by rotation of the valve body 4, and the center O of the outlet 3a is forced to deviate from a rotation trajectory of a front end portion 4b of the fluid control recess 4d that starts to overlap the outlet 3a by the rotation of the valve body 4.

This cold generation device implements the Joule-Thomson expansion principle. It includes a heat exchanger having a fluid under high pressure and under low pressure circulating in counterflow therethrough. The heat exchanger is formed of the stack of pellets (5) made of a porous material, and particularly a sintered material, forming a cylindrical mandrel, having a capillary (10) wound at the periphery thereof and in contact therewith, the capillary having the high-pressure fluid circulating therethrough, the low-pressure fluid circulating in counterflow inside of the porous mandrel thus formed.

An electromagnetic valve according to one embodiment includes a body having a lead-in port through which a refrigerant is led in, a lead-out port through which the refrigerant is led out, and a valve hole formed in a passage joining the lead-in port to the lead-out port, a main valve element that opens and closes a valve section by moving toward and away from the valve hole, and a solenoid that supplies a drive force in a direction of axis line to the valve element, the solenoid being mounted on the body. The main valve element has a pilot passage that is open to the valve hole and an orifice that throttles and expands the refrigerant led in from the lead-in port so as to be led out to the pilot passage, the orifice being so formed as to communicate between the lead-in port and the pilot passage.