| 摘要 |
A wrapped fin heat exchanger having a plurality of circuits is disclosed. A bottom circuit of the wrapped fin heat exchanger is arranged in multiple rows and has circuiting to provide hot gaseous refrigerant to the areas of highest frost concentration during operation in the defrost mode. The circuiting allows for hot gaseous refrigerant to enter the inner loop and then flow downwardly to the bottom of the coil where the highest frost accumulation is concentrated. Refrigerant then flows upwardly through the outer row of the coil to an intermediate transition loop. The refrigerant then flows upwardly through the inner row and then back to the outer row and downwardly to an inner stop loop before being connected to the header. Hence, by circuiting the heat exchanger in the appropriate configuration it is possible to achieve the optimal frost melting and heat transfer arrangement.
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