GAS HEAT PUMP SYSTEM

• US 20200132349A1
• Filed: 01/11/2018
• Published: 04/30/2020
• Est. Priority Date: 06/26/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: HONG, Seokpyo
• Granted Patent: US 11,460,223 B2
• Time in Patent Office: Days
• CPC Class Codes: C21D 1/00 General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
• CPC Class Codes: C21D 2211/001 Austenite
• CPC Class Codes: C21D 6/004 containing Cr and Ni
• CPC Class Codes: C21D 8/105 of ferrous alloys
• CPC Class Codes: C21D 9/08 for tubular bodies or pipes
• CPC Class Codes: C22C 38/42 with copper
• CPC Class Codes: C22C 38/58 with more than 1.5% by weight of manganese
• CPC Class Codes: F16L 9/06 Corrugated pipes
• CPC Class Codes: F16L 9/17 obtained by bending a sheet longitudinally and connecting the edges
• CPC Class Codes: F25B 1/04 with compressor of rotary type F25B1/005, F25B1/10 take precedence
• CPC Class Codes: F25B 2313/02741 using one four-way valve
• CPC Class Codes: F25B 2327/001 of the internal combustion type
• CPC Class Codes: F25B 2400/12 Inflammable refrigerants
• CPC Class Codes: F25B 2600/2513 Expansion valves
• CPC Class Codes: F25B 27/02 using waste heat, e.g. from internal-combustion engines
• CPC Class Codes: F25B 2700/1933 Suction pressures
• CPC Class Codes: F25B 2700/2106 of fresh outdoor air
• CPC Class Codes: F25B 30/02 of the compression type
• CPC Class Codes: F25B 41/40 Fluid line arrangements
• CPC Class Codes: F25B 41/42 Arrangements for diverging or converging flows, e.g. branch lines or junctions
• CPC Class Codes: F25B 9/006 : the refrigerant containing more than one component F25B9/004 takes precedence

Abstract

A gas heat pump system according to an embodiment of the present disclosure comprising: an outdoor unit comprising a compressor, an outdoor heat exchanger, and an expansion device; an indoor unit comprising an indoor heat exchanger; a refrigerant pipe configured to connect the outdoor unit and the indoor unit so as to allow a refrigerant to circulate through the outdoor unit and the indoor unit; an engine configured to combust mixed fuel in which fuel and air are mixed so as to provide power for driving the compressor; a coolant tank configured to store a coolant for cooling the engine; a coolant pump configured to allow the coolant stored in the coolant tank to forcibly flow; a radiator configured to emit, to an outside, heat which is transferred from the engine to the coolant; and a coolant pipe configured to connect the coolant tank, the coolant pump, and the radiator so as to allow the coolant to circulate therethrough. The gas heat pump system has a cooling capability between 71 kW and 85 kW, a mixed refrigerant containing R32 of 50% or more is used as the refrigerant, and the refrigerant pipe comprises a ductile stainless steel pipe having a delta ferrite matrix structure of 1% or less on a basis of a grain area.

Claims

1. A gas heat pump system comprising:

an outdoor unit comprising a compressor, an outdoor heat exchanger, and an expansion device;

an indoor unit comprising an indoor heat exchanger;

a refrigerant pipe configured to connect the outdoor unit and the indoor unit so as to allow a refrigerant to circulate through the outdoor unit and the indoor unit;

an engine configured to combust mixed fuel in which fuel and air are mixed so as to provide power for driving the compressor;

a coolant tank configured to store a coolant for cooling the engine;

a coolant pump configured to allow the coolant stored in the coolant tank to forcibly flow;

a radiator configured to emit, to an outside, heat which is transferred from the engine to the coolant; and

a coolant pipe configured to connect the coolant tank, the coolant pump, and the radiator so as to allow the coolant to circulate therethrough,

wherein the gas heat pump system has a cooling capability between 71 kW and 85 kW,

wherein a mixed refrigerant containing R32 of 50% or more is used as the refrigerant, and

wherein the refrigerant pipe comprises a ductile stainless steel pipe having a delta ferrite matrix structure of 1% or less on a basis of a grain area.

2. The gas heat pump system according to claim 1, wherein a filling amount of the refrigerant is 10.5 kg.

3. The gas heat pump system according to claim 1, wherein the ductile stainless steel pipe has an austenite matrix structure and an average diameter of 30 μ

m to 60 μ

m, and

an American Society for Testing and Material (ASTM) grain size No. of the ductile stainless steel pipe is 5.0 to 7.0.

4. The gas heat pump system according to claim 1, wherein the refrigerant pipe comprises a suction pipe configured to guide suction of the refrigerant to the compressor, and

the suction pipe has an outer diameter of 25.40 mm and an inner diameter of 24.10 mm.

5. The gas heat pump system according to claim 4, wherein the suction pipe is provided with a wrinkle part, and

the wrinkle part comprises a plurality of mountain portions and a plurality of valley portions, which are alternately disposed.

6. The gas heat pump system according to claim 1, wherein the refrigerant pipe comprises a discharge pipe configured to guide discharge of the refrigerant from the compressor, and

the discharge pipe has an outer diameter of 19.05 mm and an inner diameter of 18.07 mm.

7. The gas heat pump system according to claim 6, wherein the discharge pipe is provided with a wrinkle part, and

the wrinkle part comprises a plurality of mountain portions and a plurality of valley portions, which are alternately disposed.

8. The gas heat pump system according to claim 1, wherein the compressor is an inverter scroll compressor.