A heat exchanger includes a plurality of fins and a plurality of tubes that are inserted into the fins and that allow refrigerant to flow in the tubes. The tubes include first heat transfer tubes and second heat transfer tubes. Each of the first heat transfer tubes includes grooves formed in an inner surface of the first heat transfer tube, and has an inside diameter Da and a groove depth Ta. Each of the second heat transfer tubes has an inner surface smoothed, has an inside diameter Db, and is connected to an associated one of the first heat transfer tubes. Da−2×Ta≤Db is satisfied.

A refrigerator includes a cabinet configured to define a low-temperature storage space and a machine room, in which a compressor is disposed; and a condenser disposed in the machine room. The condenser includes a header comprising a first header and a second header, which are spaced apart from each other, a plurality of tubes configured to connect the first header to the second header, and a heat exchange fin disposed between the tubes spaced apart from each other. The header includes a baffle configured to partition an inner space of the header so as to guide a flow direction of a refrigerant, each of the tubes includes a passage in which a hollow is defined so that the refrigerant flows, and the passage has a volume that gradually decreases along a flow path of the refrigerant.

A liquid reservoir, a method for manufacturing the liquid reservoir, and a compressor having the liquid reservoir are disclosed. The liquid reservoir has a barrel, an air inlet tube, an air outlet tube, and a valve. The valve has a partition plate arranged in the barrel. An outer periphery of the partition plate is coupled to an inner peripheral wall of the barrel to divide the internal space of the barrel into an air inlet chamber and an air outlet chamber. The partition plate has a valve hole communicating the air inlet chamber with the air outlet chamber. A limit plate is arranged in the air outlet chamber and at least partially spaced apart from the partition plate. An outer periphery of the limit plate is coupled to the inner peripheral wall of the barrel. The limit plate has a connection hole and a guide hole.

A cooling system uses P-traps to address the oil return issues that result from a vertical separation between the compressor and the high side heat exchanger. Generally, the vertical piping that carries the refrigerant from the compressor to the high side heat exchanger includes P-traps installed at various heights to capture oil in the refrigerant and to prevent that oil from flowing back to the compressor. As oil collects in the P-traps, the refrigerant begins to push the oil upwards until the oil reaches the high side heat exchanger. Multiple piping of different sizes may be used depending on a discharge pressure of the compressor. When the discharge pressure is higher, a larger piping may be used direct the oil and refrigerant to the high side heat exchanger.

An air conditioner selection system is a system for selecting an air conditioner including an indoor unit. The air conditioner selection system is provided with a floor area acquisition section, an allowable refrigerant amount acquisition section, and an air conditioner selection section. The floor area acquisition section acquires a floor area of a room where the indoor unit is to be installed. The allowable refrigerant amount acquisition section acquires an allowable refrigerant amount of a refrigerant allowed to remain in the room at least based on the floor area acquired by the floor area acquisition section. The air conditioner selection section selects the air conditioner including the indoor unit installable in the room at least based on the allowable refrigerant amount acquired by the allowable refrigerant amount acquisition section.

A method for determining a pipe diameter of a liquid-side connection pipe in a refrigeration apparatus includes causing a computer to obtain a heating capacity, maximum heating load, and maximum cooling load; causing the computer to determine a pipe diameter of the liquid-side connection pipe by reducing a reference pipe diameter based on either a value obtained by dividing the maximum heating load by the maximum cooling load or a value obtained by subtracting the maximum heating load from the heating capacity; and installing the refrigeration apparatus using the liquid-side connection pipe having the determined pipe diameter.

The present invention relates to a water-cooling type condenser, and more specifically, to a water-cooling type condenser including a fixing plate for fixing a gas and liquid separator, wherein the fixing plate is formed to enable a refrigerant and cooling water to flow by means of coupling between first and second plate portions, and is integrally formed, by brazing, with remaining components (a plate, a first inlet pipe, a first outlet pipe, a second inlet pipe, and a second outlet pipe), so as to enhance assemblability and durability and enable size reduction.

A thermoelectric conversion element includes a thermoelectric member that is columnar and an insulator formed around the thermoelectric member. Particles are enclosed between the thermoelectric member and the insulator.

In one embodiment, an apparatus includes an insert for an evaporator coil. The insert is a curved wire located within the evaporator coil. The insert for the evaporator coil reduces refrigerant charge in the evaporator coil and causes refrigerant flowing through the evaporator coil to change direction.

A cooling system uses P-traps to address the oil return issues that result from a vertical separation between the compressor and the high side heat exchanger. Generally, the vertical piping that carries the refrigerant from the compressor to the high side heat exchanger includes P-traps installed at various heights to capture oil in the refrigerant and to prevent that oil from flowing back to the compressor. As oil collects in the P-traps, the refrigerant begins to push the oil upwards until the oil reaches the high side heat exchanger. Multiple piping of different sizes may be used depending on a discharge pressure of the compressor. When the discharge pressure is higher, a larger piping may be used direct the oil and refrigerant to the high side heat exchanger.