Abstract: Multi-type air conditioner including a plurality of compressors, a plurality of temperature sensors mounted in the plurality of compressors for sensing temperatures in the compressors respectively, and an equalizing pipe in communication with the plurality of compressors, for uniform distribution of oil among the plurality of compressors according to the temperatures sensed at the plurality of temperature sensors respectively, thereby distributing oil among the compressors uniformly at an exact time point at which the oil is distributed among the compressors non-uniformly, not only to permit improvement of the performance of the compressors, but also to permit improvement performance of the air conditioner having the compressors.

Abstract: Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to the refrigerant flow controlling part, a defrosting device at a side of the outdoor heat exchanger, and a piping system connected between the parts, a plurality of indoor units each installed in a room and having an indoor heat exchanger and an electronic expansion valve having one end connected to one end of the indoor heat exchanger, and a distributor between the outdoor unit and the indoor units for selectively guiding refrigerant from the outdoor unit to the plurality of indoor units proper to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again.

Abstract: Disclosed herein is an oil separator for air conditioners that is capable of separating oil from refrigerant. The oil separator comprises a shell having a cylindrical space defined therein, a refrigerant introduction pipe for introducing refrigerant into the shell, a refrigerant discharge pipe for discharging the refrigerant out of the shell, and oil-drop growth accelerating member for accelerating growth of oil drops contained in the refrigerant flowing in the shell.

Abstract: An air conditioning system and an apparatus for protecting the same. The air conditioning system comprise an outdoor unit, a plurality of indoor units connected to the outdoor unit by each refrigerant line, and a refrigerant line closing unit installed at the refrigerant line of the indoor unit for preventing a refrigerant flowing on the refrigerant line of the indoor unit from being introduced into the outdoor unit when power supply to one or more indoor units is cut off.

Abstract: An air conditioning system includes a compressor; an outdoor heat exchanger that discharges evaporated refrigerant; and a first pipe coupling the outdoor heat exchanger and the compressor, where the first pipe allows the outdoor heat exchanger to receive at least a portion of the compressed refrigerant from the compressor.

Abstract: An apparatus for controlling a refrigerant level comprises a first detecting unit installed at a lower side of the inside of a refrigerant tank, for detecting whether a refrigerant stored at a lower side of the inside of the refrigerant is a liquefied refrigerant or a gaseous refrigerant, a second detecting unit installed at an upper side of the inside of the refrigerant tank, for detecting whether a refrigerant stored at an upper side of the inside of the refrigerant tank is a liquefied refrigerant and a gaseous refrigerant, and a control unit controlling intake and discharge of the liquefied refrigerant according to a value measured by the first detecting unit and the second detecting unit.

Abstract: A multi-type air conditioner includes an outdoor unit, one or more indoor units communicating with the outdoor unit, and a liquid-stay preventing device heating and evaporating a liquefied refrigerant so as to prevent the liquefied refrigerant circulating between the indoor unit and the outdoor unit from being accumulated at a low pressure side including the indoor unit. Accordingly, a liquefied refrigerant is not accumulated in an indoor unit and a connection pipe, which are a low pressure side where the pressure is relatively low, but smoothly passes therethrough regardless of a height difference between the indoor unit and the outdoor unit. Therefore, the efficiency of the multi-type air conditioner is improved.

Abstract: Disclosed are an abnormal state detecting apparatus of a multi-type air conditioner and a method thereof. The method comprises: a user's selecting a test operation, and then detecting plural indoor temperatures of indoor zones where a plurality of indoor units are installed and plural outdoor temperatures of outdoor zones where a plurality of outdoor units are installed; selecting a corresponding test operation mode among a plurality of test operation modes preset according to an average indoor temperature of the detected plural indoor temperatures and an average outdoor temperature of the detected plural outdoor temperatures; test-operating the multi-type air conditioner according to the selected test operation mode, and collecting data showing an operation state of the test-operated air conditioner; and comparing the collected data with a preset reference data and judging an abnormal state of the multi-type air conditioner based on the comparison result.

Abstract: A compact ventilating system having an air purifying function is disclosed, which includes a case provided in the inside of a room; an air-supplying passage for penetrating a wall through the case under a ceiling, to introduce an outdoor air to the inside of the room by communicating the outside of the room, the case, and the inside of the room with one another; an air-discharging passage for penetrating the wall through the case under the ceiling, to discharge an indoor air to the outside of the room by communicating the inside of the room, the case, and the outside of the room with one another; an air-circulating passage for communicating the inside of the room with one point of the air-supplying passage in the case, to introduce the indoor air to the inside of the case, and to re-supply the introduced indoor air to the inside of the room; and a fan provided in the case, for providing the outdoor air introduced to the case through the air-supplying passage to the inside of the room, or re-supplying the indo

Abstract: An exhaust gas heat exchanger for a cogeneration system is disclosed. In the exhaust gas heat exchanger, a heat exchanger cover is arranged around a heat exchanger body such that a primary heat medium passage, through which a heat medium passes, is defined between the heat exchanger cover and the heat exchanger body. In the heat exchanger body, a heat medium tube forming a secondary heat medium passage, through which the heat medium emerging from the primary heat medium passage passes, is arranged. Accordingly, the heat medium primarily absorbs heat from the exhaust gas while passing through the primary heat medium passage, and then secondarily absorbs heat from the exhaust gas while passing through the secondary heat medium passage. As a result, an enhancement in heat exchanging efficiency is achieved.

Abstract: An air-conditioner having a dual-refrigerant cycle includes a primary refrigerant circuit heat-exchanged with outdoor air; a secondary refrigerant circuit heat-exchanged with indoor air to perform either a cooling operation or a heating operation; and a heat exchange unit disposed between the primary refrigerant circuit and the secondary refrigerant circuit to perform heat exchange therebetween, wherein the secondary refrigerant circuit includes a compressor for compressing a refrigerant circulating in the secondary refrigerant circuit. A condensing pressure of the primary refrigerant circuit is lowered during the hating operation and an evaporation pressure of the primary refrigerant circuit is increased to thereby enhance efficiency of the air-conditioner.

Abstract: An air conditioner including an indoor heat exchange unit to perform a heat exchange process by the supply and absorption of heat through the circulation of a first refrigerant, at least one outdoor heat exchange unit to perform a heat exchange process by the absorption and supply of heat through the circulation of a second refrigerant, and an intermediate connection unit to perform a heat exchange between the first refrigerant and the second refrigerant.

Abstract: An air conditioning system including an outdoor heat-exchanging unit, at least one indoor heat-exchanging unit, a gaseous refrigerant line connected between the outdoor heat-exchanging unit and the indoor heat-exchanging unit, to allow a refrigerant in a gaseous state to flow between the outdoor heat-exchanging unit and the indoor heat-exchanging unit, and a pressure compensation device for increasing a pressure of the gaseous refrigerant flowing through the gaseous refrigerant line. The pressure compensation device is located along the gaseous refrigerant line at a position closer to the indoor heat-exchanging unit than to the outdoor heat-exchanging unit. A pressure compensation device for use in an air conditioning system is also provided.

Abstract: A compression system for an air conditioning system includes first and second compressors. The first compressor includes a first compression chamber in which a fluid introduced from an outside of the first compressor is compressed, and a first case defining a first space into which the fluid compressed in the first compression chamber is introduced. The second compressor includes a second case defining a second space into which the fluid compressed in the first compressor is introduced, and a second compression chamber in which the fluid introduced from the second space is compressed. The second compressor operates independently of the first compressor, and a connecting line connects the first and second compressors.

Abstract: An air conditioner including a plurality of compressors uses at least one oil separator for separating oil from an oil-mixed refrigerant discharged from the compressors. The air conditioner performs an oil balancing operation, during which some compressors operate and some do not. At least a portion of the oil separated by the oil separator is distributed to the compressors that are not operating during the oil balancing operation.

Abstract: A second-refrigerant pump driving type air conditioner, including an indoor unit having an indoor heat exchanger that circulates a refrigerant containing no oil, a first circulator including a compressor that compresses and discharges a refrigerant containing oil, a first outdoor heat exchanger, a second outdoor heat exchanger, and an outdoor expander, and a second circulator including an intermediate heat exchanger connected to the indoor heat exchanger that circulates the refrigerant containing no oil and heat-exchanges the refrigerant of the first outdoor heat exchanger, a receiver, and a pump. A restriction of a length and a diameter of a connection pipe for connecting an outdoor unit and the indoor unit is decreased, and an oil shortage of the compressor is prevented.

Abstract: A method for controlling a cogeneration system is disclosed. The control method determines whether or not the operation load or power load of an air conditioner corresponds to a load requiring driving of a generator, controls the generator to operate when it is determined that the operation load of the air conditioner corresponds to the generator driving load, controls the air conditioner to operate using electric power generated from the generator when the generator operates normally, and controls the air conditioner to operate using commercial electric power when the operation load of the air conditioner is not the generator driving load or when the generator operates abnormally. Accordingly, there are advantages in terms of economy and safety.

Abstract: An air conditioning system comprises a first tank connected to an outlet side refrigerant line of an indoor unit, a second tank disposed to be lower than the first tank, middle tank installed between the first tank and the second tank, a heat source cycle for depressurizing and cooling the first refrigerant inside the first tank by circulating a second refrigerant and heating the first refrigerant of the second tank, a middle tank cooling unit for feed back connected to an inlet side refrigerant line of the second tank among refrigerant lines of the heat source cycle, a middle tank heating unit for feed back connected to a refrigerant line between the first tank and the second tank among refrigerant lines of the heat source cycle, and a controller for selectively circulating the second refrigerant of the heat source cycle to the middle tank cooling unit for feed back or the middle tank heating unit for feed back.

Abstract: Ventilating and air purifying device including a case having a blower therein provided to a ceiling or a wall, a first flow passage provided between the blower and a room for making an outdoor, the blower, and the room in communication, a second flow passage for making the room, an inside of the case, and the outdoor in communication, and a damper in the case for isolating the first flow passage from the second flow passage so that room air is discharged to the outdoor and the room air is guided to the blower, or making the first flow passage and the second flow passage in communication so that the room air introduced into the second flow passage is guided to the blower, thereby ventilating and purifying the room air.

Abstract: A multi-air conditioner comprising: a plurality of indoor units for exchanging the heat with indoor air; a plurality of outdoor units, each outdoor unit having an outdoor heat exchanger for exchanging the heat and a compressor for compressing a fluid; a connecting pipe for connecting the indoor units with the outdoor units; and a pressure equalizing pipe for communicating the outdoor heat exchanger of one outdoor unit with the compressor of at least one other outdoor unit, so that the multi-air conditioner is capable of improving stability, reliability and efficiency of a system by equalizing the low pressure between the indoor units in heating and equalizing the high pressure between the outdoor units in cooling.