Precision air conditioner with an indirect evaporative unit

Abstract

The present invention relates to a precision air conditioner with an indirect evaporative unit, which comprises a gas-gas heat exchanger, an external circulation fan, an internal circulation fan, a gas filter module, a gas humidification module, an evaporator, a condenser, a condenser fan, a compressor and an air conditioner enclosure. The combination of indirect evaporative cooling and mechanical refrigeration enables indirect evaporative cooling to operate all year round with high air conditioning and refrigeration efficiency. During summer, mechanical refrigeration is used for secondary cooling to achieve the desired temperature. Further, the condenser of the precision air conditioner is upgraded to an indirect evaporative condenser, and the mechanical refrigeration efficiency can be greatly improved.

We claim: 
     
         1 . A precision air conditioner with an indirect evaporative unit, comprising:
 a gas-gas heat exchanger, an external circulation fan, an internal circulation fan, a gas filter module, a gas humidification module, an evaporator, a condenser, a condenser fan, a compressor, an air conditioner enclosure;   wherein the gas-gas heat exchanger is provided with a heat exchanger internal circulation air inlet, a heat exchanger internal circulation air outlet, a heat exchanger external circulation air inlet, a heat exchanger external circulation air outlet, a heat exchanger internal circulation passage, and a heat exchanger external circulation passage and heat exchanger plates; the gas-gas heat exchanger is a type of gas-gas heat exchanger having dividing walls, and the heat exchanger plates are arranged to be spaced to form the heat exchanger internal circulation passage and the heat exchanger external circulation passage; heat is transferred between external air and internal air through the heat exchanger plates of the gas-gas heat exchanger;   wherein the air conditioner enclosure is arranged around the precision air conditioner with an indirect evaporative unit; the air conditioner enclosure is provided with an internal circulation air inlet, an internal circulation air exhaust passage, an external circulation air inlet, an external circulation air intake passage and an external circulation air exhaust passage;   wherein the internal circulation air inlet is connected to the heat exchanger internal circulation air inlet, and the external circulation air intake passage is connected to the heat exchanger external circulation air inlet;   wherein the external circulation fan is arranged above the gas-gas heat exchanger;   wherein the internal circulation fan is arranged below the gas-gas heat exchanger;   wherein the gas filter module, which is connected with the external circulation air inlet, is arranged in the external circulation air intake passage; the gas filter module is arranged perpendicularly or substantially perpendicularly;   wherein the gas humidification module is arranged between the gas filter module and the gas-gas heat exchanger;   wherein the evaporator is arranged in the internal circulation air exhaust passage below the gas-gas heat exchanger;   wherein the condenser is arranged below or above the external circulation air intake passage and communicates with the external circulation air intake passage;   wherein the condenser fan is arranged below or above the condenser;   wherein the compressor is connected to the evaporator and the condenser,   wherein the precision air conditioner has a complete external air circulation as follows:
 the external air goes through the gas filter module and enters the external circulation air intake passage, and then enters the heat exchanger external circulation passage after being humidified by the gas humidification module; heat is transferred between the external air and the internal air flowing in the heat exchanger internal circulation passage through the heat exchanger plates, and then the external air enters the external circulation air exhaust passage, and then is exhausted to the exterior by the external circulation fan; 
   wherein the precision air conditioner has a complete internal air circulation as follows:
 the internal air enters the heat changer internal circulation passage from the internal circulation air inlet; heat is transferred between the internal air and the external air flowing in the heat exchanger external circulation passage through the heat exchanger plates; the internal air goes through the evaporator and then is cooled; the internal air then enters the internal circulation air exhaust passage, and then is exhausted to the interior by the internal circulation fan; 
   wherein the precision air conditioner has a complete condenser cooling gas-circulation as follows:
 the external air goes through the gas filter module and enters the external circulation air intake passage, and then enters the condenser after being humidified by the humidification module; heat is transferred between the external air and the condenser, and then the external air is exhausted to the exterior by the condenser fan. 
   
     
     
         2 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the gas-gas heat exchanger is a cuboid having a rectangular cross section; and   wherein the heat exchanger external circulation air outlet is arranged on the top of the gas-gas heat exchanger, the heat exchanger internal circulation air outlet is arranged on the bottom of the gas-gas heat exchanger, the heat exchanger external circulation air inlet is arranged at the bottom-right corner of the gas-gas heat exchanger, and the heat exchanger internal circulation air inlet is arranged at the top-left corner of the gas-gas heat exchanger.   
     
     
         3 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the gas-gas heat exchanger has a hexagonal cross section; and   wherein the gas-gas heat exchanger employs a counter-flow arrangement in the middle portion and a cross-flow arrangement at the inlet or outlet for the external air and the internal air.   
     
     
         4 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the gas-gas heat exchanger has a pentagonal cross section; and   wherein the gas-gas heat exchanger employs a counter-flow arrangement in the middle portion and a cross-flow arrangement at the inlet or outlet for the external air and the internal air.   
     
     
         5 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the gas-gas heat exchanger has a cross section of a combination of two quadrangles; and   wherein the gas-gas heat exchanger employs a cross-flow arrangement in the middle portion and at the inlet or outlet for the external air and the internal air.   
     
     
         6 . The precision air conditioner with an indirect evaporative unit according to  claim 1 , wherein a cleaning nozzle to spray liquid is arranged inside the gas-gas heat exchanger. 
     
     
         7 . The precision air conditioner with an indirect evaporative unit according to  claim 1 , wherein the gas filter module comprises an automatic dust removal assembly for periodically removing dust from a filter screen. 
     
     
         8 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the gas humidification module further comprises a variable-frequency water pump, and water pressure is adjusted by adjusting working load of the variable-frequency water pump during the operation of an air conditioning system;   wherein the gas humidification module further comprises a plurality of sets of nozzles, each of which corresponds to a specific start-up pressure, and the nozzle will work when the pressure is greater than or equal to the start-up pressure of the corresponding nozzle.   
     
     
         9 . The precision air conditioner with an indirect evaporative unit according to  claim 1 , wherein the external circulation air exhaust passage of the air conditioner enclosure is curved, and the external circulation air is distributed to both sides of the air conditioner enclosure and exhausted to exterior. 
     
     
         10 . The precision air conditioner with an indirect evaporative unit according to  claim 1 ,
 wherein the internal circulation fan and the external circulation fan are centrifugal electronically commutated fans; and   wherein flow direction changes by 90 degrees or nearly 90 degrees after the air passes through the fan.