Patent ID: 11927379
Assignee: XI'AN JIAOTONG UNIVERSITY
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 8:
9. The control method of claim 8, wherein the defrosting temperature difference setting value in the three conditions of entering the defrosting mode is calculated as follows:
where (° C.) is the defrosting temperature difference setting value Tair (° C.) is the ambient temperature;
the maximum setting defrosting time in the three conditions of exiting the defrosting mode is calculated as follows:, t
   
    df
    ,
    max
   
  
  =
  
   15
   +
   
    
     1
     2
    
    ⁢
    abs
    ⁢
    
     (
     
      T
      air
     
     )
    
   
  
 

where tdf,max (° C.) is the maximum setting defrosting time, Tair (° C.) is the ambient temperature, and abs(Tair) is an absolute value of the ambient temperature; and
a discharge pressure during defrosting is set as:, {
  
   
    
     
      
       P
       d
      
      =
      
       
        
         9
         4
        
        ⁢
        
         P
         s
        
       
       +
       
        
         1
         10
        
        ⁢
        
         abs
         ⁡
         (
         
          T
          air
         
         )
        
       
      
     
    
   
   
    
     
      
       P
       
        d
        ,
        max
       
      
      =
      11
     
    
   
  
 

where Pd (MPa) is the discharge pressure during defrosting; Pd,max (MPa) is an upper limit of the discharge pressure during defrosting, and PS (MPa) is a suction pressure during defrosting.