Refrigeration Unit

Abstract

An air conditioner comprises an outdoor heat exchanger having a plate fin whose surface is treated to have water-sliding properties and water repellency and a drain pan arranged under the outdoor heat exchanger. There is a gap throughout between the lower end portion of the outdoor heat exchanger and the upper surface of the drain pan. Water droplets condensed when the outdoor heat exchanger operates as an evaporator fall on the drain pan from the lower end portion of the plate fin. Since the plate fin and the drain pan are not in contact with each other, there is no such case that ice adheres to the contact portion and frost develops therefrom.

1 . A refrigeration apparatus including: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating along the heat exchanging surface and a heating medium circulating through the heat exchanger; and    a drain pan arranged below the heat exchanger, the refrigeration apparatus being characterized by:    a space is formed entirely between a lower end of the heat exchanger and an upper surface of the drain pan.    
   
   
       2 . A refrigeration apparatus including: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating along the heat exchanging surface and a heating medium circulating through the heat exchanger; and    a drain pan arranged below the heat exchanger;    wherein the heat exchanger is arranged in a manner that a lower end of the heat exchanger partially comes into contact with an upper surface of the drain pan, the refrigeration apparatus being characterized by:    a projection is arranged on the lower end of the heat exchanger, and the partial contact between the lower end of the heat exchanger and the upper surface of the drain pan is performed by a distal end of the projection coming in contact with the upper surface of the drain pan.    
   
   
       3 . The refrigeration apparatus according to  claim 2 , characterized in that: 
 the heat exchanger is a cross fin and tube heat exchanger including a plurality of fins that form the heat exchanging surface and a heat exchanger pipe through which the heating medium circulates; and    the projection is arranged on a lower end of each of the plurality of fins and is formed as an inclined portion that is inclined relative to a direction in which the air circulates.    
   
   
       4 . The refrigeration apparatus according to  claim 2 , characterized in that: 
 the heat exchanger is a cross fin and tube heat exchanger including a plurality of fins that form the heat exchanging surface and a heat exchanger pipe through which the heating medium circulates; and    the projection is arranged on lower ends of some of the plurality of fins and projects more outward than lower ends of the other fins.    
   
   
       5 . The refrigeration apparatus according to  claim 4 , characterized in that the projection has a surface subjected to a hydrophilic treatment.  
   
   
       6 . A refrigeration apparatus including: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating along the heat exchanging surface and a heating medium circulating through the heat exchanger, the refrigeration apparatus being characterized by:    a high temperature portion arranged below the heat exchanger and heating a water droplet that condenses and runs down the heat exchanging surface to 0° C. or higher when the heat exchanger operates as an evaporator.    
   
   
       7 . The refrigeration apparatus according to  claim 6 , characterized in that: 
 the heat exchanger is a cross fin and tube heat exchanger including a plurality of fins that form the heat exchanging surface and a heat exchanger pipe through which the heating medium circulates; and    the high temperature portion is formed by only the fins.    
   
   
       8 . The refrigeration apparatus according to  claim 6 , characterized in that: 
 the heat exchanger includes a heater, the heater is arranged in a state contact a lower end surface of the heat exchanger, and the heater heats a lower part of the heat exchanger to form the high temperature portion.    
   
   
       9 . The refrigeration apparatus according to  claim 6 , characterized in that: 
 the heat exchanger is divided into an upper heat exchanging portion and a lower heat exchanging portion and includes an expansion valve, with the upper heat exchanging portion and the lower heat exchanging portion being connected by the expansion valve, and the heating medium being supplied to the lower heat exchanging portion, the expansion value, and the upper heat exchanging portion in this order so that the lower heat exchanging portion operates as a condenser and the upper heat exchanging portion operates as an evaporator; and    the high temperature portion is formed by the lower heat exchanging portion that operates as the condenser.    
   
   
       10 . The refrigeration apparatus according to any one of  claims 6  to  9 , characterized in that: 
 the high temperature portion has a surface subjected to a hydrophilic treatment.    
   
   
       11 . A refrigeration apparatus including: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating along the heat exchanging surface and a heating medium circulating through the heat exchanger, the refrigeration apparatus being characterized in that:    the heat exchanger is a cross fin and tube heat exchanger including a plurality of fins that form the heat exchanging surface and a heat exchanger pipe through which the heating medium circulates; and    a projection is formed on lower ends of some of the plurality of fins, and the projection projects more downward than lower ends of the other fins.    
   
   
       12 . The refrigeration apparatus according to  claim 11 , characterized in that: 
 the heat exchanger includes a lower part with a surface subjected to a hydrophilic treatment.    
   
   
       13 . A refrigeration apparatus including: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating along the heat exchanging surface and a heating medium circulating through the heat exchanger; and    a drain pan arranged below the heat exchanger, the refrigeration apparatus being characterized in that:    the drain pan has an upper surface subjected to a water slipping and water repellent treatment.    
   
   
       14 . A refrigeration apparatus comprising: 
 a heat exchanger having a heat exchanging surface and exchanging heat between air circulating on the heat exchanging surface and a heating medium circulating inside the heat exchanger; and    a drain pan arranged below the heat exchanger,    wherein the drain pan has an upper surface subjected to hydrophilic treatment.    
   
   
       15 . The refrigeration apparatus according to  claim 1 , characterized in that: 
 the heat exchanging surface has water slippage and water repellency.