Mode of operation of multizone central air conditioning and multizone central air conditioning

FIELD: power industry.

SUBSTANCE: invention relates to heat engineering. The multizone central air conditioning system with a variable flow rate of coolant implementing the method of its operation on the basis of the steam compression refrigerator comprises the external unit in the housing of which the remote compressor and condenser unit or the remote condenser with the air heat exchanger and the fan is installed, and the air heat exchanger is fitted with, at least, one infrared heater connected with the control unit to which the air temperature sensor in the housing of the external block, and the coolant temperature sensor downstream the air heat exchanger are connected.

EFFECT: method allows to improve efficiency and reliability of operation of multizone central air conditioning system with the variable coolant flow rate, and also to provide a possibility of simultaneous operation in various premises of a part of internal units for cooling, and another part - for heating in the thermal pump mode.

3 cl, 1 dwg

 

The invention relates to the field of power engineering and can be used to improve the efficiency and reliability of VRF air conditioning systems with variable refrigerant flow, provides the possibility of simultaneous work in different areas of the indoor units for cooling, and the other part for heating in heat pump mode.

The prior art discloses a method of operating a multi-zone air conditioning system with variable refrigerant flow (VRF) based on the steam compression refrigerating machine comprising an outdoor unit with an air heat exchanger, cooled by outside air that is passed through the casing of the outdoor unit by means of a fan (see, e.g., S. V. Bruch. Informed choice triple tube VRF air conditioning systems, S. O. K. (Plumbing heating air Conditioning) N 5, 2004 Category: air Conditioning and ventilation; EN 2395041 C1, F24F 12/00, 2010). However, at low temperatures of external air (usually below -10°C) well-known air conditioning system are unreliable.

The prior art also known split air conditioning system with variable refrigerant flow - VRF-based steam compression refrigeration system including outdoor unit, the casing of which is mounted remote compressordecompressor unit or remote condenser with an air exchanger and a fan (see, for example, S. V. Bruch. Informed choice triple tube VRF air conditioning systems, S. O. K. (Plumbing heating air Conditioning) No. 5, 2004 Category: air Conditioning and ventilation; EN 2395041 C1, F24F 12/00, 2010). The disadvantage of such air conditioning systems is the fact that the reliability and efficiency of their work depends significantly on the temperature of the outside air entering the inlet of the outdoor unit, and negative at low outside temperatures (typically below -10°C) well-known air conditioning system are unreliable.

The invention is aimed at improving the efficiency and reliability of split air conditioning system with variable refrigerant flow, operating with heat recovery in a wide range of ambient air temperatures, including, and at low temperatures of external air.

The solution of this problem is achieved in that in the method of operating a multi-zone air conditioning system with variable refrigerant flow - VRF-based steam compression refrigerating machine comprising an outdoor unit with an air heat exchanger, cooled by outside air that is passed through the casing of the outdoor unit by means of a fan, according to the invention, at negative temperatures outside measure temperature in�of Suha in the housing of the outdoor unit and the refrigerant temperature at the outlet of the air heat exchanger and the air temperature in the housing of the outdoor unit is below a predetermined negative value include heating the outer surface air heat exchanger with one or more heaters and maintain the temperature of the refrigerant at the outlet of the air heat exchanger above said predetermined negative value by changing the power of the heaters.

Preferably, the negative value of air temperature in the housing of the outdoor unit, which includes heating the outer surface of the air heat exchanger, set in the range from -10°C to -20°C, while the temperature of the refrigerant at the outlet of the air heat exchanger is maintained in the range from -10°C to +5°C.

The solution of this problem is provided by the fact that in the multizone air conditioning system with variable refrigerant flow - VRF-based steam compression refrigeration system including outdoor unit, the casing of which is mounted a remote condensing unit or remote condenser with an air heat exchanger according to the invention, the air heat exchanger is provided with at least one infrared heater is connected with the control unit connected to the temperature sensor in the housing of the outdoor unit and the refrigerant temperature at the outlet of the air heat exchanger.

The presence of a temperature sensor in the housing of the outdoor unit and the refrigerant temperature n� the outlet of the air heat exchanger, which are connected with the control unit, which is connected to the infrared heaters, heating the outer surface of the air heat exchanger when the air temperature in the housing of the outdoor unit is below a predetermined negative value and to maintain temperature of the refrigerant at the outlet of the air heat exchanger above said predetermined negative value, provides a simple structural embodiment of a reliable and efficient performance multi-zone air conditioning system with variable refrigerant flow - VRF at low temperatures of external air (including, and below -10°C).

The drawing schematically shows a General view of the inventive multi-zone air conditioning system.

Split air conditioning system is made on the basis of the steam compression refrigeration system and includes the outdoor unit, in the housing 1 which is mounted a remote condensing unit 2 (or remote condenser) air heat exchanger 3 and the fan 4, the air heat exchanger 3 is provided with at least one infrared heater 5 is connected with the control unit 6 is connected to the sensor 7, the temperature of the air in the housing 1 of the outdoor unit, and the sensor 8, the temperature of the refrigerant at the outlet of the air heat exchanger� 3.

The claimed method of operating the multi air conditioning system is as follows.

At negative ambient air temperatures measured by the sensor 7 is connected to the control unit 6, the temperature of the air in the housing 1 of the outdoor unit and the operation mode of the indoor units of VRF system (not shown) included in the mode "heating", when the air temperature in the housing 1 of the outdoor unit is below a predetermined negative value, which is set preferably in the range from -10°C to -20°C, the control unit 6 comprises heating the outer surface of the air heat exchanger 3 via one or more infrared heaters 5 (in this case, optionally, fan 4, which provides the blowout air heat exchanger 3 outside air passing through the housing 1 of the outdoor unit, can be disabled). In addition, by means of the sensor 8 connected to the control unit 6, measure the temperature of the refrigerant at the outlet of the air heat exchanger 3 and the control unit 6 automatically, by changing the power of the infrared heaters 5, maintains the temperature of the refrigerant at the outlet of the air heat exchanger 3 above said predetermined negative value, preferably in the range from -10°C to +5°C, for example equal to -5°C.

1. Method R�bots VRF air conditioning systems with variable refrigerant flow - VRF based on the steam compression refrigeration system including outdoor unit, air heat exchanger which are blown outside air that is passed through the casing of the outdoor unit by means of the fan, characterized in that at low outdoor air temperature measure the air temperature in the housing of the outdoor unit and the refrigerant temperature at the outlet of the air heat exchanger and the air temperature in the housing of the outdoor unit is below a predetermined negative value include heating the outer surface of the air heat exchanger with one or more heaters and maintain the temperature of the refrigerant at the outlet of the air heat exchanger above said predetermined negative value by changing the power of the heaters.

2. The operation method according to claim 1, characterized in that a negative value of air temperature in the housing of the outdoor unit, which includes heating the outer surface of the air heat exchanger, set in the range from -10°C to -20°C, while the temperature of the refrigerant at the outlet of the air heat exchanger is maintained in the range from -10°C to +5°C.

3. Split air conditioning system with variable refrigerant flow - VRF-based steam compression refrigerating machine comprising an outdoor unit, in the case� of which is mounted a remote condensing unit or remote condenser air heat exchanger and fan, characterized in that the air heat exchanger is provided with at least one infrared heater is connected with the control unit connected to the temperature sensor in the housing of the outdoor unit and the refrigerant temperature at the outlet of the air heat exchanger.



 

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