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EP1555494B1 - Heating and cooling system - Google Patents

Heating and cooling system Download PDF

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Publication number
EP1555494B1
EP1555494B1 EP04253026A EP04253026A EP1555494B1 EP 1555494 B1 EP1555494 B1 EP 1555494B1 EP 04253026 A EP04253026 A EP 04253026A EP 04253026 A EP04253026 A EP 04253026A EP 1555494 B1 EP1555494 B1 EP 1555494B1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
heat exchanger
heating
pipe
cooling system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04253026A
Other languages
German (de)
French (fr)
Other versions
EP1555494A3 (en
EP1555494A2 (en
Inventor
Kook Jeong Seo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1555494A2 publication Critical patent/EP1555494A2/en
Publication of EP1555494A3 publication Critical patent/EP1555494A3/en
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Publication of EP1555494B1 publication Critical patent/EP1555494B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/04—Desuperheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0405—Refrigeration circuit bypassing means for the desuperheater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0417—Refrigeration circuit bypassing means for the subcooler

Definitions

  • the present invention relates to a heating and cooling system comprising a heating and cooling system comprising a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, a subsidiary heat exchanger connected between the indoor and outdoor heat exchangers, a bypass pipe connected in parallel with the subsidiary heat exchanger operable to allow the refrigerant to flow therethrough and bypass the subsidiary heat exchanger and a bypass valve is connected to the bypass pipe to selectively direct the flow of refrigerant either through the bypass refrigerant pipe or through the subsidiary heat exchanger.
  • a heating and cooling system is known from JP 2003 130481A .
  • Heating and cooling systems generally comprise a compressor for compressing a refrigerant into a high-temperature and high-pressure state, an indoor heat exchanger, an outdoor heat exchanger, an expansion valve for decompressing and expanding the refrigerant, and a four-way valve positioned at an outlet of the compressor for selectively directing the flow of refrigerant to either the indoor or the outdoor heat exchanger dependent on whether the heating or cooling mode is selected.
  • the above heating and cooling system further comprises a subsidiary heat exchanger for heat-exchanging the refrigerant discharged from the outdoor heat exchanger with the refrigerant drawn into the compressor when the system is operating in a cooling mode, so that the refrigerant guided into the indoor heat exchanger is cooled and the refrigerant drawn into the compressor is heated, thereby increasing cooling efficiency.
  • the system when the system is operating in a heating mode, when the refrigerant passes through the outdoor heat exchanger, it is evaporated and heated by outdoor air, thus being maintained at a relatively high temperature compared to the refrigerant passing from the indoor heat exchanger towards the outdoor heat exchanger. Therefore, when the refrigerant passes through the subsidiary heat exchanger, the high temperature refrigerant from the outdoor heat exchanger is heat-exchanged with the relatively cooler refrigerant from the indoor heat exchanger before it reaches the outdoor heat exchanger, thereby increasing the temperature of the refrigerant just about to pass through the outdoor heat exchanger and so reducing the efficiency of the heating mode.
  • a heating and cooling system is characterised in that the bypass valve is operable to direct the flow of refrigerant through the subsidiary heat exchanger if the temperature of refrigerant being drawn into the compressor is higher than a predetermined temperature.
  • refrigerant flows between the indoor and outdoor heat exchangers through a connection refrigerant pipe and the refrigerant flows back into an inlet of the compressor through an inlet refrigerant pipe
  • said subsidiary heat exchanger advantageously being operable to heat exchange refrigerant flowing through the connection refrigerant pipe with refrigerant flowing through the inlet refrigerant pipe.
  • each end of the bypass pipe is respectively connected to the inlet refrigerant pipe either side of the subsidiary heat exchanger, and the bypass valve is connected where one end of the bypass pipe meets the inlet refrigerant pipe.
  • an expansion valve disposed in the connection refrigerant pipe and preferably, a four-way valve is provided to selectively direct the flow of refrigerant from an outlet of the compressor to either the indoor or the outdoor heat exchanger.
  • refrigerant flows from the compressor along an outlet refrigerant pipe and a hot water supply heat exchanger is connected in parallel to the outlet refrigerant pipe, and a hot water supply valve is connected to the hot water supply heat exchanger to direct the flow of refrigerant through the hot water supply heat exchanger in case the heating and cooling system requires hot water.
  • a heating and cooling system in accordance with the present invention comprises a compressor 1 for compressing a refrigerant into a high-temperature and high-pressure state, a four-way valve 2 disposed at an outlet of the compressor 1 for selectively directing the flow of the refrigerant according to a selected operating mode, i.e. heating or cooling mode, an indoor heat exchanger 4 for heat-exchanging the refrigerant with indoor air, an outdoor heat exchanger 3 for heat-exchanging the refrigerant with outdoor air, and an expansion valve 5 for decompressing and expanding the refrigerant.
  • Carbon dioxide (CO 2 ) is used as the refrigerant in the heating and cooling system of the present invention.
  • the outdoor heat exchanger 3 serves as a condenser and the indoor heat exchanger 4 serves as an evaporator, thereby causing the heating and cooling system of the present invention to be operated in the cooling mode.
  • the indoor heat exchanger 4 serves as a condenser and the outdoor heat exchanger 3 serves as an evaporator, thereby causing the heating and cooling system of the present invention to be operated in the heating mode.
  • the above parts of the heating and cooling system constitute a closed circuit through refrigerant pipes 6a, 6b and 6c.
  • the refrigerant pipes 6a, 6b and 6c comprise an outlet refrigerant pipe 6a for guiding the refrigerant discharged from the compressor 1 to the four-way valve 2, an inlet refrigerant pipe 6b for guiding the refrigerant from the four-way valve 2 to the compressor 1 and a connection refrigerant pipe 6c disposed between the outdoor heat exchanger 3 and the indoor heat exchanger 4 for guiding the refrigerant discharged from the outdoor heat exchanger 3 to the indoor heat exchanger 4 and vice versa.
  • the expansion valve 5 is disposed in the connection refrigerant pipe 6c.
  • a hot water supply heat exchanger 7 is connected in parallel to the outlet refrigerant pipe 6a for heat-exchanging the refrigerant with supplied water in order to provide hot water, and a hot water supply valve 7a is provided for selectively directing the refrigerant to the hot water supply heat exchanger 7 when required.
  • the heating and cooling system of the present invention further comprises a subsidiary heat exchanger 8 operable to heat the refrigerant prior to entering the compressor 1 in the cooling mode, thus improving the cooling efficiency.
  • a part of the inlet refrigerant pipe 6b and a part of the connection refrigerant pipe 6c close to the outdoor heat exchanger 3 are disposed in the subsidiary heat exchanger 8 so that the refrigerants passing therethrough are heat-exchanged.
  • the refrigerant passing through the inlet refrigerant pipe 6b is heated by the refrigerant passing through the connection refrigerant pipe 6c, and the refrigerant passing through the connection refrigerant pipe 6c is cooled by heat exchange with the refrigerant passing through the inlet refrigerant pipe 6b, before the refrigerant passing through the connection refrigerant pipe 6c is decompressed and expanded by the expansion valve 5.
  • the heating and cooling system of the present invention further comprises a bypass refrigerant pipe 9 provided with ends respectively connected to positions of the inlet refrigerant pipe 6b at either side of the subsidiary heat exchanger 8 so as to allow the refrigerant to bypass the subsidiary heat exchanger 8. Heat exchange of the refrigerants by the subsidiary heat exchanger 8 can therefore selectively be performed in the cooling mode and suppressed in the heating mode.
  • a bypass valve 9a is disposed where the inlet refrigerant pipe 6b and the bypass refrigerant pipe 9 are connected, for selectively directing the refrigerant to either the subsidiary heat exchanger 8 or the bypass refrigerant pipe 9, according to whether the cooling or heating mode is selected.
  • the refrigerant drawn into the compressor 1 by the bypass valve 9a does not pass through the subsidiary heat exchanger 8 but is introduced directly into the compressor 1 through the bypass refrigerant pipe 9. Since the refrigerant supplied to the outdoor heat exchanger 3 through the connection refrigerant pipe 6c is expanded by the expansion valve 5 and has a temperature lower than that of outdoor air, it is heated and evaporated by the outdoor air when it passes through the outdoor heat exchanger 3. If it was to then pass through the subsidiary heat exchanger 8 along the inlet refrigerant pipe 6b, it would be cooled again by the refrigerant passing through the connection refrigerant pipe 6c, thereby being converted into a liquid state. However, the above described structure of the bypass refrigerant pipe 9 and bypass valve 9a of the present invention serves to prevent the generation of liquid refrigerant.
  • the bypass valve 9a directs the flow of refrigerant through the subsidiary heat exchanger 8. This causes the refrigerant to be cooled by heat exchange with the refrigerant passing through the connection refrigerant pipe 6c, thereby preventing the compressor 1 from being overloaded due to excessive pressure generated when the temperature of the refrigerant is higher than the designated value.
  • the refrigerant in a high-temperature and high-pressure state is discharged from the compressor 1 and is directed to the outdoor heat exchanger 3 by the four-way valve 2. Accordingly, in the cooling mode, the outdoor heat exchanger 3 serves as a condenser and the indoor heat exchanger 4 serves as an evaporator.
  • the refrigerant supplied to the outdoor heat exchanger 3 emits heat so that it is cooled, and it then passes through the expansion valve 5 disposed in the connection refrigerant pipe 6c whereby it is decompressed and expanded. It then flows to the indoor heat exchanger 4 where it is heat-exchanged with indoor air, absorbs heat from the indoor air, and cools an indoor space.
  • the refrigerant is continuously being drawn into the compressor 1 through the four-way valve 2 and the inlet refrigerant pipe 6b.
  • the bypass valve 9a directs the flow of refrigerant through the subsidiary heat exchanger 8, thus allowing it to be heat exchanged with the refrigerant passing through the connection refrigerant pipe 6c.
  • the refrigerant flowing to the indoor heat exchanger 4 through the connection refrigerant pipe 6c is cooled and the refrigerant flowing to the compressor 1 through the inlet refrigerant pipe 6b is heated, thereby increasing cooling efficiency of the heating and cooling system.
  • the refrigerant in the high-temperature and high-pressure state discharged from the compressor 1 is directed to the indoor heat exchanger 4 by the four-way valve 2. Accordingly, in the heating mode, the indoor heat exchanger 4 serves as a condenser and the outdoor heat exchanger 3 serves as an evaporator.
  • the refrigerant supplied to the indoor heat exchanger 4 emits heat by being heat-exchanged with the indoor air, thereby heating the indoor space.
  • the refrigerant then flows through the expansion valve 5 where it is decompressed and expanded. It then flows to the outdoor heat exchanger 3 through the connection refrigerant pipe 6c where it absorbs heat through heat exchange with the outdoor air, and is heated. Then, the refrigerant is continuously being drawn into the compressor 1 through the four-way valve 2 and the inlet refrigerant pipe 6b.
  • bypass valve 9a directs the refrigerant to the bypass refrigerant pipe 9 so that it does not pass through the subsidiary heat exchanger 8 and is directly drawn into the compressor 1, thereby preventing any heat-exchange with the refrigerant passing through the connection refrigerant pipe 6c.
  • the refrigerant passing through the inlet refrigerant pipe 6b is directed to the subsidiary heat exchanger 8 by the bypass valve 9a.
  • the refrigerant passing through the inlet refrigerant pipe 6b is heat-exchanged with the refrigerant passing through the connection refrigerant pipe 6c, thereby being cooled.
  • the hot water supply heat exchanger 7 is connected in parallel to the outlet refrigerant pipe 6a. If the heating and cooling system requires hot water, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is supplied to the hot water supply heat exchanger 7, thereby heating water.
  • the present invention provides a heating and cooling system including a bypass refrigerant pipe and a bypass valve operable to allow refrigerant to bypass a subsidiary heat exchanger in a heating mode, thereby preventing the deterioration of heating efficiency that is caused by the subsidiary heat exchanger in the heating mode.
  • system of the present invention is operable to allow the refrigerant passing through an inlet refrigerant pipe to be directed to the subsidiary heat exchanger and cooled by the refrigerant passing through a connection refrigerant pipe, if the refrigerant introduced into a compressor has a temperature higher than a designated value, in order to prevent the compressor from being overloaded.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Description

  • The present invention relates to a heating and cooling system comprising a heating and cooling system comprising a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, a subsidiary heat exchanger connected between the indoor and outdoor heat exchangers, a bypass pipe connected in parallel with the subsidiary heat exchanger operable to allow the refrigerant to flow therethrough and bypass the subsidiary heat exchanger and a bypass valve is connected to the bypass pipe to selectively direct the flow of refrigerant either through the bypass refrigerant pipe or through the subsidiary heat exchanger. Such a heating and cooling system is known from JP 2003 130481A .
  • Heating and cooling systems generally comprise a compressor for compressing a refrigerant into a high-temperature and high-pressure state, an indoor heat exchanger, an outdoor heat exchanger, an expansion valve for decompressing and expanding the refrigerant, and a four-way valve positioned at an outlet of the compressor for selectively directing the flow of refrigerant to either the indoor or the outdoor heat exchanger dependent on whether the heating or cooling mode is selected.
  • The above heating and cooling system further comprises a subsidiary heat exchanger for heat-exchanging the refrigerant discharged from the outdoor heat exchanger with the refrigerant drawn into the compressor when the system is operating in a cooling mode, so that the refrigerant guided into the indoor heat exchanger is cooled and the refrigerant drawn into the compressor is heated, thereby increasing cooling efficiency.
  • However, when the system is operating in a heating mode, when the refrigerant passes through the outdoor heat exchanger, it is evaporated and heated by outdoor air, thus being maintained at a relatively high temperature compared to the refrigerant passing from the indoor heat exchanger towards the outdoor heat exchanger. Therefore, when the refrigerant passes through the subsidiary heat exchanger, the high temperature refrigerant from the outdoor heat exchanger is heat-exchanged with the relatively cooler refrigerant from the indoor heat exchanger before it reaches the outdoor heat exchanger, thereby increasing the temperature of the refrigerant just about to pass through the outdoor heat exchanger and so reducing the efficiency of the heating mode.
  • Therefore, it is an object of the present invention to provide a heating and cooling system, which substantially alleviates or overcomes the deterioration of heating mode efficiency caused by a subsidiary heat exchanger which is used to increase cooling efficiency.
  • Accordingly, a heating and cooling system according to the present invention is characterised in that the bypass valve is operable to direct the flow of refrigerant through the subsidiary heat exchanger if the temperature of refrigerant being drawn into the compressor is higher than a predetermined temperature.
  • Conveniently, refrigerant flows between the indoor and outdoor heat exchangers through a connection refrigerant pipe and the refrigerant flows back into an inlet of the compressor through an inlet refrigerant pipe, said subsidiary heat exchanger advantageously being operable to heat exchange refrigerant flowing through the connection refrigerant pipe with refrigerant flowing through the inlet refrigerant pipe.
  • Preferably, each end of the bypass pipe is respectively connected to the inlet refrigerant pipe either side of the subsidiary heat exchanger, and the bypass valve is connected where one end of the bypass pipe meets the inlet refrigerant pipe.
  • In a preferred embodiment, an expansion valve disposed in the connection refrigerant pipe, and preferably, a four-way valve is provided to selectively direct the flow of refrigerant from an outlet of the compressor to either the indoor or the outdoor heat exchanger.
  • Preferably, refrigerant flows from the compressor along an outlet refrigerant pipe and a hot water supply heat exchanger is connected in parallel to the outlet refrigerant pipe, and a hot water supply valve is connected to the hot water supply heat exchanger to direct the flow of refrigerant through the hot water supply heat exchanger in case the heating and cooling system requires hot water.
  • A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
    • Figure 1 is a schematic view illustrating the flow of a refrigerant in a cooling mode of a heating and cooling system in accordance with the present invention;
    • Figure 2 is a schematic view illustrating the flow of the refrigerant in a heating mode of the heating and cooling system in accordance with the present invention; and
    • Figure 3 is a schematic view illustrating the flow of the refrigerant, in which heat-exchange is achieved by a subsidiary heat exchanger, in the heating mode of the heating and cooling system in accordance with the present invention.
  • Referring now to Figure 1, a heating and cooling system in accordance with the present invention comprises a compressor 1 for compressing a refrigerant into a high-temperature and high-pressure state, a four-way valve 2 disposed at an outlet of the compressor 1 for selectively directing the flow of the refrigerant according to a selected operating mode, i.e. heating or cooling mode, an indoor heat exchanger 4 for heat-exchanging the refrigerant with indoor air, an outdoor heat exchanger 3 for heat-exchanging the refrigerant with outdoor air, and an expansion valve 5 for decompressing and expanding the refrigerant. Carbon dioxide (CO2) is used as the refrigerant in the heating and cooling system of the present invention.
  • When the four-way valve 2 is operated to direct the high-temperature and high-pressure refrigerant discharged from the compressor 1 to the outdoor heat exchanger 3, the outdoor heat exchanger 3 serves as a condenser and the indoor heat exchanger 4 serves as an evaporator, thereby causing the heating and cooling system of the present invention to be operated in the cooling mode. On the other hand, when the refrigerant discharged from the compressor 1 is directed to the indoor heat exchanger 4, the indoor heat exchanger 4 serves as a condenser and the outdoor heat exchanger 3 serves as an evaporator, thereby causing the heating and cooling system of the present invention to be operated in the heating mode.
  • The above parts of the heating and cooling system constitute a closed circuit through refrigerant pipes 6a, 6b and 6c. The refrigerant pipes 6a, 6b and 6c comprise an outlet refrigerant pipe 6a for guiding the refrigerant discharged from the compressor 1 to the four-way valve 2, an inlet refrigerant pipe 6b for guiding the refrigerant from the four-way valve 2 to the compressor 1 and a connection refrigerant pipe 6c disposed between the outdoor heat exchanger 3 and the indoor heat exchanger 4 for guiding the refrigerant discharged from the outdoor heat exchanger 3 to the indoor heat exchanger 4 and vice versa. The expansion valve 5 is disposed in the connection refrigerant pipe 6c.
  • A hot water supply heat exchanger 7 is connected in parallel to the outlet refrigerant pipe 6a for heat-exchanging the refrigerant with supplied water in order to provide hot water, and a hot water supply valve 7a is provided for selectively directing the refrigerant to the hot water supply heat exchanger 7 when required.
  • The heating and cooling system of the present invention further comprises a subsidiary heat exchanger 8 operable to heat the refrigerant prior to entering the compressor 1 in the cooling mode, thus improving the cooling efficiency. A part of the inlet refrigerant pipe 6b and a part of the connection refrigerant pipe 6c close to the outdoor heat exchanger 3 are disposed in the subsidiary heat exchanger 8 so that the refrigerants passing therethrough are heat-exchanged. Therefore, in a cooling mode, the refrigerant passing through the inlet refrigerant pipe 6b is heated by the refrigerant passing through the connection refrigerant pipe 6c, and the refrigerant passing through the connection refrigerant pipe 6c is cooled by heat exchange with the refrigerant passing through the inlet refrigerant pipe 6b, before the refrigerant passing through the connection refrigerant pipe 6c is decompressed and expanded by the expansion valve 5.
  • The heating and cooling system of the present invention further comprises a bypass refrigerant pipe 9 provided with ends respectively connected to positions of the inlet refrigerant pipe 6b at either side of the subsidiary heat exchanger 8 so as to allow the refrigerant to bypass the subsidiary heat exchanger 8. Heat exchange of the refrigerants by the subsidiary heat exchanger 8 can therefore selectively be performed in the cooling mode and suppressed in the heating mode. A bypass valve 9a is disposed where the inlet refrigerant pipe 6b and the bypass refrigerant pipe 9 are connected, for selectively directing the refrigerant to either the subsidiary heat exchanger 8 or the bypass refrigerant pipe 9, according to whether the cooling or heating mode is selected.
  • Accordingly, in the heating mode, the refrigerant drawn into the compressor 1 by the bypass valve 9a does not pass through the subsidiary heat exchanger 8 but is introduced directly into the compressor 1 through the bypass refrigerant pipe 9. Since the refrigerant supplied to the outdoor heat exchanger 3 through the connection refrigerant pipe 6c is expanded by the expansion valve 5 and has a temperature lower than that of outdoor air, it is heated and evaporated by the outdoor air when it passes through the outdoor heat exchanger 3. If it was to then pass through the subsidiary heat exchanger 8 along the inlet refrigerant pipe 6b, it would be cooled again by the refrigerant passing through the connection refrigerant pipe 6c, thereby being converted into a liquid state. However, the above described structure of the bypass refrigerant pipe 9 and bypass valve 9a of the present invention serves to prevent the generation of liquid refrigerant.
  • In the heating mode, if the refrigerant being drawn into the compressor 1 has a temperature higher than a predetermined value, the bypass valve 9a directs the flow of refrigerant through the subsidiary heat exchanger 8. This causes the refrigerant to be cooled by heat exchange with the refrigerant passing through the connection refrigerant pipe 6c, thereby preventing the compressor 1 from being overloaded due to excessive pressure generated when the temperature of the refrigerant is higher than the designated value.
  • Hereinafter, operation and effects of the above described heating and cooling system of the present invention will be described in detail.
  • First, the cooling mode of the heating and cooling system of the present invention will be described. The refrigerant in a high-temperature and high-pressure state is discharged from the compressor 1 and is directed to the outdoor heat exchanger 3 by the four-way valve 2. Accordingly, in the cooling mode, the outdoor heat exchanger 3 serves as a condenser and the indoor heat exchanger 4 serves as an evaporator.
  • The refrigerant supplied to the outdoor heat exchanger 3 emits heat so that it is cooled, and it then passes through the expansion valve 5 disposed in the connection refrigerant pipe 6c whereby it is decompressed and expanded. It then flows to the indoor heat exchanger 4 where it is heat-exchanged with indoor air, absorbs heat from the indoor air, and cools an indoor space. The refrigerant is continuously being drawn into the compressor 1 through the four-way valve 2 and the inlet refrigerant pipe 6b.
  • In the cooling mode, the bypass valve 9a directs the flow of refrigerant through the subsidiary heat exchanger 8, thus allowing it to be heat exchanged with the refrigerant passing through the connection refrigerant pipe 6c. The refrigerant flowing to the indoor heat exchanger 4 through the connection refrigerant pipe 6c is cooled and the refrigerant flowing to the compressor 1 through the inlet refrigerant pipe 6b is heated, thereby increasing cooling efficiency of the heating and cooling system.
  • Next, with reference to Figure 2, the heating mode of the heating and cooling system of the present invention will be described. The refrigerant in the high-temperature and high-pressure state discharged from the compressor 1 is directed to the indoor heat exchanger 4 by the four-way valve 2. Accordingly, in the heating mode, the indoor heat exchanger 4 serves as a condenser and the outdoor heat exchanger 3 serves as an evaporator.
  • The refrigerant supplied to the indoor heat exchanger 4 emits heat by being heat-exchanged with the indoor air, thereby heating the indoor space. The refrigerant then flows through the expansion valve 5 where it is decompressed and expanded. It then flows to the outdoor heat exchanger 3 through the connection refrigerant pipe 6c where it absorbs heat through heat exchange with the outdoor air, and is heated. Then, the refrigerant is continuously being drawn into the compressor 1 through the four-way valve 2 and the inlet refrigerant pipe 6b.
  • In the heating mode, the bypass valve 9a directs the refrigerant to the bypass refrigerant pipe 9 so that it does not pass through the subsidiary heat exchanger 8 and is directly drawn into the compressor 1, thereby preventing any heat-exchange with the refrigerant passing through the connection refrigerant pipe 6c.
  • However, referring now to Figure 3, if the temperature of the refrigerant drawn into the compressor 1 is more than a designated value, the refrigerant passing through the inlet refrigerant pipe 6b is directed to the subsidiary heat exchanger 8 by the bypass valve 9a. The refrigerant passing through the inlet refrigerant pipe 6b is heat-exchanged with the refrigerant passing through the connection refrigerant pipe 6c, thereby being cooled.
  • In the heating and cooling system of the present invention, the hot water supply heat exchanger 7 is connected in parallel to the outlet refrigerant pipe 6a. If the heating and cooling system requires hot water, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is supplied to the hot water supply heat exchanger 7, thereby heating water.
  • As is apparent from the above description, the present invention provides a heating and cooling system including a bypass refrigerant pipe and a bypass valve operable to allow refrigerant to bypass a subsidiary heat exchanger in a heating mode, thereby preventing the deterioration of heating efficiency that is caused by the subsidiary heat exchanger in the heating mode.
  • Furthermore, the system of the present invention is operable to allow the refrigerant passing through an inlet refrigerant pipe to be directed to the subsidiary heat exchanger and cooled by the refrigerant passing through a connection refrigerant pipe, if the refrigerant introduced into a compressor has a temperature higher than a designated value, in order to prevent the compressor from being overloaded.
  • Although the preferred embodiment of the invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the invention as disclosed in the claims hereafter.

Claims (6)

  1. A heating and cooling system comprising a compressor (1) for compressing a refrigerant, an indoor heat exchanger (4), an outdoor heat exchanger (3), a subsidiary heat exchanger (8) connected between the indoor and outdoor heat exchangers (4,3), a bypass pipe (9) connected in parallel with the subsidiary heat exchanger (8) operable to allow the refrigerant to flow therethrough and bypass the subsidiary heat exchanger (8) and a bypass valve (9a) is connected to the bypass pipe (9) to selectively direct the flow of refrigerant either through the bypass pipe (9) or through the subsidiary heat exchanger (8) characterised in that the bypass valve (9a) is operable to direct the flow of refrigerant through the subsidiary heat exchanger (8) if the temperature of refrigerant being drawn into the compressor (1) is higher than a predetermined temperature.
  2. A heating and cooling system according to claim 1 wherein refrigerant flows between the indoor and outdoor heat exchangers (4,3) through a connection refrigerant pipe (6c) and the refrigerant flows back into an inlet of the compressor through an inlet refrigerant pipe (6b), said subsidiary heat exchanger (8) being operable to heat exchange refrigerant flowing through the connection refrigerant pipe (6c) with refrigerant flowing through the inlet refrigerant pipe (6b).
  3. A heating and cooling system according to claim 2 wherein each end of the bypass pipe (9) is respectively connected to the inlet refrigerant pipe (6b) either side of the subsidiary heat exchanger (9), and the bypass valve (9a) is connected where one end of the bypass pipe (9) meets the inlet refrigerant pipe (6b).
  4. A heating and cooling system according to claim 2 or claim 3 including an expansion valve (5) disposed in the connection refrigerant pipe (6c).
  5. A heating and cooling system according to any preceding claim further comprising a four-way valve (2) to selectively direct the flow of refrigerant from an outlet of the compressor to either the indoor or the outdoor heat exchanger (4,3).
  6. A heating and cooling system according to any preceding claim wherein refrigerant flows from the compressor along an outlet refrigerant pipe (62) and a hot water supply heat exchanger (7) is connected in parallel to the outlet refrigerant pipe (62), and a hot water supply valve (70) is connected to the hot water supply heat exchanger (7) to direct the flow of refrigerant through the hot water supply heat exchanger (7) in case the heating and cooling system requires hot water.
EP04253026A 2004-01-13 2004-05-21 Heating and cooling system Expired - Lifetime EP1555494B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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Also Published As

Publication number Publication date
EP1555494A3 (en) 2006-06-07
CN1641294A (en) 2005-07-20
EP1555494A2 (en) 2005-07-20
KR20050074066A (en) 2005-07-18
KR101034204B1 (en) 2011-05-12
DE602004017112D1 (en) 2008-11-27
CN1311210C (en) 2007-04-18

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