COOLING SYSTEM CAPABLE OF DEFROSTING

• US 20160238296A1
• Filed: 02/12/2016
• Published: 08/18/2016
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: Mpi Corporation
• Original Assignee: Mpi Corporation
• Inventors: SAINT PIERRE, Michael Roy, KRYSTAD, Helge Jacob, CHANG, Ying-Chiao, LEE, Yueh-Ying
• Granted Patent: US 10,655,893 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F25B 2400/0403 for the condenser
• CPC Class Codes: F25B 2400/0411 for the expansion valve or capillary tube
• CPC Class Codes: F25B 2400/13 Economisers
• CPC Class Codes: F25B 2600/021 Inverters therefor
• CPC Class Codes: F25B 2600/111 of condenser fans
• CPC Class Codes: F25B 2600/2507 Flow-diverting valves
• CPC Class Codes: F25B 40/00 Subcoolers, desuperheaters or superheaters
• CPC Class Codes: F25B 47/022 hot gas defrosting
• CPC Class Codes: F25B 49/025 Motor control arrangements
• CPC Class Codes: F25B 49/027 Condenser control arrangements
• CPC Class Codes: F25B 6/04 arranged in series
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A cooling system includes a cooling device, a controller and a defrosting unit. The cooling device has a compressor, a condenser, an expander, an evaporator, a cooling channel and a coolant. The coolant is functioned in the evaporator to thermally exchange with a working fluid in a pipe. The controller is adapted for controlling the temperature of the working fluid by controlling the cooling device. The defrosting unit has a switch disposed on the cooling channel and located between the compressor and the condenser, and a defrosting channel connected with the switch. After passing through the switch, the coolant is optionally fed to anyone of the cooling channel and the defrosting channel. After flowing through the defrosting channel, the coolant passes through the evaporator and then flows back to the compressor. As a result, the cooling system is capable of fast defrosting without using a heater.

Claims

1. A cooling system capable of defrosting, which is adapted for cooling a working fluid flowing in a pipe, comprising:

a cooling device having a compressor, a condenser, an expander, an evaporator, a cooling channel, and a coolant capable of flowing in the cooling channel to pass through the compressor, the condenser, the expander and the evaporator;

the coolant in the evaporator being functioned to thermally exchange with the working fluid flowing in the pipe and passing by the evaporator;

a controller electrically connected with the cooling device for controlling a temperature of the working fluid by controlling the cooling device; and

a defrosting unit having a switch disposed on the cooling channel and located between the compressor and the condenser, and a defrosting channel connected with the switch;

after passing through the switch, the coolant being optionally fed to anyone of the cooling channel and the defrosting channel;

after flowing through the defrosting channel, the coolant passing through the evaporator and then flowing back to the compressor.

2. The cooling system capable of defrosting as claimed in claim 1, wherein the cooling device further comprises at least one additional condenser;

the coolant flowing into the cooling channel from the switch passes through the condenser, the at least one additional condenser and the expander, and then flows into the evaporator;

after flowing out from the evaporator, the coolant flows back to the at least one additional condenser, and then flows back to the compressor.

3. The cooling system capable of defrosting as claimed in claim 2, wherein the at least one additional condenser comprises a first additional condenser and a second additional condenser;

the cooling device further comprises a phase separator and an additional expander;

the coolant flowing into the cooling channel from the switch flows through the condenser, the first additional condenser and the phase separator;

after flowing out from the phase separator, a part of the coolant flows through the additional expander and then flows backwards to the second additional condenser, and the other part of the coolant flows through the second additional condenser, the expander and the evaporator;

after flowing out from the evaporator, the coolant flows back to the second additional condenser and the first additional condenser, and then flows back to the compressor.

4. The cooling system capable of defrosting as claimed in claim 3, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature, a mass flow of the working fluid in the pipe and a temperature in the evaporator.

5. The cooling system capable of defrosting as claimed in claim 2, wherein the working fluid flowing in the pipe passes by the at least one additional condenser to thermally exchange with the coolant in the at least one additional condenser, and then passes by the evaporator to thermally exchange with the coolant in the evaporator, so that the cooling system outputs the working fluid with the temperature below 0°

C.

6. The cooling system capable of defrosting as claimed in claim 2, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature and a temperature in the evaporator.

7. The cooling system capable of defrosting as claimed in claim 1, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature and a mass flow of the working fluid in the pipe.

8. The cooling system capable of defrosting as claimed in claim 1, wherein the cooling device further comprises at least one additional condenser;

the coolant in the evaporator and the at least one additional condenser is functioned to thermally exchange with the working fluid so as to cool down the working fluid.

9. A cooling system capable of defrosting, which is adapted for cooling a working fluid flowing in a pipe, comprising:

a cooling device having a compressor provided with a motor, a condenser, an expander, an evaporator, a cooling channel, and a coolant capable of flowing in the cooling channel to pass through the compressor, the condenser, the expander and the evaporator;

the coolant in the evaporator being functioned to thermally exchange with the working fluid flowing in the pipe and passing by the evaporator;

a controller electrically connected with the cooling device for controlling a rotary speed of the motor of the compressor so as to control a temperature of the working fluid for adjusting a temperature of a device under test; and

a defrosting unit having a switch, and a defrosting channel connected with the switch;

after passing through the switch, the coolant being optionally fed to anyone of the cooling channel and the defrosting channel;

by flowing through the defrosting channel, the coolant passing through the evaporator after passing through the compressor, so as to defrost the pipe.

10. The cooling system capable of defrosting as claimed in claim 9, wherein the rotary speed of the motor is controlled by the controller according to a target temperature and a temperature in the evaporator.

11. The cooling system capable of defrosting as claimed in claim 9, wherein the switch is controlled by the controller according to a mass flow of the working fluid in the pipe.

12. A cooling system capable of defrosting, which is adapted for cooling a working fluid flowing in a pipe, comprising:

a cooling device having a compressor, a condenser, an expander, an evaporator, a cooling channel, and a coolant capable of flowing in the cooling channel to pass through the compressor, the condenser, the expander and the evaporator;

the coolant in the evaporator being functioned to thermally exchange with the working fluid;

a controller electrically connected with the cooling device for controlling a temperature of the working fluid by controlling the cooling device; and

a defrosting unit having a defrosting channel;

by flowing through the defrosting channel, the coolant passing through the evaporator after passing through the compressor, so as to defrost the pipe.

13. The cooling system capable of defrosting as claimed in claim 12, wherein the defrosting unit further comprises a switch;

after passing through the switch, the coolant is optionally fed to anyone of the cooling channel and the defrosting channel.

14. The cooling system capable of defrosting as claimed in claim 13, wherein the switch is controlled by the controller according to a mass flow of the working fluid in the pipe.

15. The cooling system capable of defrosting as claimed in claim 13, wherein the cooling device further comprises at least one additional condenser;

the coolant flowing into the cooling channel from the switch passes through the condenser, the at least one additional condenser and the expander, and then flows into the evaporator;

after flowing out from the evaporator, the coolant flows back to the at least one additional condenser, and then flows back to the compressor.

16. The cooling system capable of defrosting as claimed in claim 15, wherein the at least one additional condenser comprises a first additional condenser and a second additional condenser;

the cooling device further comprises a phase separator and an additional expander;

the coolant flowing into the cooling channel from the switch flows through the condenser, the first additional condenser and the phase separator;

after flowing out from the phase separator, a part of the coolant flows through the additional expander and then flows backwards to the second additional condenser, and the other part of the coolant flows through the second additional condenser, the expander and the evaporator;

after flowing out from the evaporator, the coolant flows back to the second additional condenser and the first additional condenser, and then flows back to the compressor.

17. The cooling system capable of defrosting as claimed in claim 16, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature, a mass flow of the working fluid in the pipe, a temperature in the evaporator, an inlet pressure of the compressor and an outlet pressure of the compressor.

18. The cooling system capable of defrosting as claimed in claim 15, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature and a temperature in the evaporator.

19. The cooling system capable of defrosting as claimed in claim 15, wherein the coolant in the evaporator and the at least one additional condenser is functioned to thermally exchange with the working fluid so as to cool down the working fluid.

20. The cooling system capable of defrosting as claimed in claim 12, wherein the compressor has a motor;

a rotary speed of the motor is controlled by the controller according to a target temperature and a mass flow of the working fluid in the pipe.