Multiform gas heat pump type air conditioning system

A multiform gas heat pump type of air conditioning system, comprising:

• a plurality of indoor units that are each provided with an indoor heat exchanger and that are configured to perform a heat exchange between air inside a room and refrigerant;
• an outdoor unit provided with a compressor driven by a gas engine and an outdoor heat exchanger configured to perform a heat exchange between outside air and the refrigerant;
• and
• a split flow control unit configured to control a flow direction of the refrigerant in each of the indoor units and to perform a selection switching between cooling and heating operations, wherein
• in the outdoor unit, a water heat exchanger is provided parallel with the outdoor heat exchanger that is configured to heat the refrigerant by obtaining waste heat from engine cooling water used for cooling the gas engine, and is configured to perform a warming operation when an outside temperature is low and fulfills the conditions for frost formation by evaporating and vaporizing the refrigerant by the water heat exchanger.

A multiform gas heat pump type of air conditioning system, comprising:

• a plurality of indoor units that are each provided with an indoor heat exchanger and that are configured to perform a heat exchange between air inside a room and refrigerant;
• an outdoor unit provided with a compressor driven by a gas engine and an outdoor heat exchanger configured to perform a heat exchange between outside air and a refrigerant;
• and
• a split flow control unit configured to control a flow direction of the refrigerant in each of the indoor units and to perform a selection switching between cooling and heating operations, wherein
• the outdoor heat exchanger is divided into a plurality of units that are connected in parallel, and there is provided a refrigerant supply switching means that for controlling the refrigerant flow in each division portion of the outdoor heat exchanger, and
• in the outdoor unit, a water heat exchanger is provided parallel with the outdoor heat exchanger that is configured to heat the refrigerant by obtaining waste heat from engine cooling water used for cooling the gas engine, and a circulation amount of engine cooling water introduced into the water heat exchanger is controlled so that the degree of superheat of the refrigerant on an intake side of the compressor is kept within a predetermined range.

The A multiform gas heat pump type of air conditioning system, comprising:

• a plurality of indoor units that are each provided with an indoor heat exchanger and that are configured to perform a heat exchange between air inside a room and refrigerant;
• an outdoor unit provided with a compressor driven by a gas engine and an outdoor heat exchanger configured to perform a heat exchange between outside air and the refrigerant;
• and
• a split flow control unit configured to control a flow direction of the refrigerant in each of said indoor units and to perform a selection switching between cooling and heating operations, wherein
• said outdoor heat exchanger is divided into a plurality of units that are connected in parallel, and there is provided a refrigerant supply switching means for controlling the refrigerant flow in each division portion of said outdoor heat exchanger, and
• a degree of superheat for the refrigerant is calculated from a value detected by a low pressure detecting means for detecting pressure on an intake side of the compressor and a value detected by a temperature detecting means for detecting a refrigerant outlet temperature of the water heat exchanger.

A multiform gas heat pump type of air conditioning system, comprising:

• a plurality of indoor units that are each provided with an indoor heat exchanger and that are configured to perform a heat exchange between air inside a room and refrigerant;
• an outdoor unit provided with a compressor driven by a gas engine and an outdoor heat exchanger configured to perform a heat exchange between outside air and the refrigerant;
• and
• a split flow control unit configured to control a flow direction of the refrigerant in each of the indoor units and to perform a selection switching between cooling and heating operations, wherein
• the outdoor heat exchanger is divided into a plurality of units that are connected in parallel, and there is provided a refrigerant supply switching means for controlling the refrigerant flow in each division portion of the outdoor heat exchanger, and
• a division portion of the outdoor heat exchanger that is in a state of suspended operation is configured to communicate with an intake system of the compressor by an operation of said refrigerant supply switching means.