Dehumidifier

1. A dehumidifier, comprising:

a housing;

a refrigerant circuit, which is configured to allow low global warming potential (GWP) refrigerant to circulate therethrough, the refrigerant circuit including a compressor having a variable operating frequency, a condenser, a pressure reducing device, and an evaporator, which are provided in the housing, the low GWP refrigerant being flammable and having a value of GWP of 6 or less;

a blowing fan, which is provided in the housing, and is configured to take in air into the housing and cause the taken-in air to pass through the evaporator and the condenser before blowing out the air from the housing; and

a water storage tank, which is provided below the evaporator, and is configured to accumulate dew condensation water generated in the evaporator,

a number of refrigerant paths passing through the evaporator being greater than a number of refrigerant paths passing through the condenser,

a fin pitch of the evaporator being smaller than a fin pitch of the condenser.

2. The dehumidifier of claim 1 ,

wherein the low GWP refrigerant is a single refrigerant containing hydrofluoroolefin having a double bond between carbon and carbon as a base component or a mixture refrigerant containing the single refrigerant.

3. The dehumidifier of claim 1 ,

wherein the low GWP refrigerant is a mixture refrigerant in which nonflammable refrigerant is mixed into a refrigerant containing hydrofluoroolefin having a double bond between carbon and carbon as a base component.

4. The dehumidifier of claim 3 ,

wherein the nonflammable refrigerant is mixed into the mixture refrigerant at a concentration of 10% to 12%.

5. The dehumidifier of claim 1 ,

wherein a refrigerant amount filled in the dehumidifier is equal to or smaller than a refrigerant amount calculated by the following expression based on a desired dehumidifying amount:

Refrigerant Amount [ g ]=7.03×Dehumidifying Amount [1/day]−1.91.

6. The dehumidifier of claim 1 ,

wherein a flow passage sectional area of the evaporator is larger than a flow passage sectional area of the condenser.

7. A dehumidifier, comprising:

a housing;

a refrigerant circuit, which is configured to allow low global warming potential (GWP) refrigerant to circulate therethrough, the refrigerant circuit including a compressor having a variable operating frequency, a condenser, a pressure reducing device, and an evaporator, which are provided in the housing, the low GWP refrigerant being flammable and having a value of GWP of 6 or less;

a blowing fan, which is provided in the housing, and is configured to take in air into the housing and cause the taken-in air to pass through the evaporator and the condenser before blowing out the air from the housing; and

a water storage tank, which is provided below the evaporator, and is configured to accumulate dew condensation water generated in the evaporator,

a number of refrigerant paths passing through the evaporator being greater than a number of refrigerant paths passing through the condenser,

a thickness of a heat transfer tube of the evaporator being larger than a thickness of a heat transfer tube of the condenser.

8. The dehumidifier of claim 7 ,

wherein a flow passage sectional area of the evaporator is larger than a flow passage sectional area of the condenser.

9. The dehumidifier of claim 7 ,

wherein a fin pitch of the evaporator is smaller than a fin pitch of the condenser.