Working medium for heat cycle, and heat cycle system

A technology of working medium and circulation system, applied in irreversible cycle compression machines, heat exchange materials, lighting and heating equipment, etc., can solve problems such as the greenhouse effect, and achieve the effect of excellent safety and excellent cycle performance

Inactive Publication Date: 2016-10-26
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, HFCs have been pointed out as poten

Method used

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  • Working medium for heat cycle, and heat cycle system
  • Working medium for heat cycle, and heat cycle system
  • Working medium for heat cycle, and heat cycle system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0196] The present invention will be described in detail through examples below, but the present invention is not limited by the following description.

[0197] [combustibility evaluation]

[0198] The evaluation of flammability was implemented using the equipment prescribed|regulated by ASTM E-681.

[0199] After vacuum-exhausting the flask with an inner volume of 12 liters installed in a thermostat controlled at a temperature of 25°C, the pressure was adjusted to atmospheric pressure. image 3 or Figure 4 Seal the working medium and air of each concentration in the graph. Thereafter, in the gas phase in the vicinity of the center in the flask, it was discharged and burned at 15 kV and 30 mA for 0.4 seconds, and then the expansion of the flame was visually confirmed. When the upward flame spread angle exceeds 90°, it is judged to be flammable, and when it is less than 90°, it is judged to be non-combustible.

example 1

[0201] HFO-1123 and HFC-134a were mixed in a predetermined ratio, and the combustibility of the two-component system working medium was evaluated. The relationship between the ratio of HFO-1123, HFC-134a and air in the gas phase in the flask and the combustibility is shown in image 3 .

[0202] Such as image 3 As shown, it can be seen that the ratio of HFO-1123 in the working medium in the gas phase in the flask is 50% by mass or less (compared to image 3 The working medium on the right side of the straight line representing HFO-1123:HFC-134a=1:1) does not have a combustible range ("combustible" range). In other words, it can be seen that a working medium in which the proportion of HFO-1123 in the working medium in the gas phase is 50% by mass or less suppresses combustibility regardless of the concentration mixed with air.

example 2

[0204] HFO-1123 and HFC-125 were mixed in a predetermined ratio, and the combustibility of the working medium of the two-component system was evaluated. The relationship between the ratio of HFO-1123, HFC-125 and air in the gas phase in the flask and the presence or absence of combustibility is shown in Figure 4 .

[0205] Such as Figure 4 As shown, it can be seen that the ratio of HFO-1123 in the working medium in the gas phase in the flask is 50% by mass or less (compared to Figure 4 The working medium on the right side of the straight line representing HFO-1123:HFC-125=1:1) does not have a combustible range ("combustible" range). In other words, it can be seen that a working medium in which the ratio of HFO-1123 in the working medium in the gas phase is 50% by mass or less suppresses combustibility regardless of the concentration mixed with air.

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Abstract

To provide a heat cycle system having excellent cycle performance and safety, whereby a working medium thereof is incombustible and ozone layer or global warming effects are low even when the working medium is leaked. A heat cycle system which uses a working medium including trifluoroethylene and 1,1,1,2-tetrafluoroethane and/or pentafluoroethane, the ratio of trifluoroethylene in a gas phase formed in the system being 50% by mass or less. For example, a refrigeration cycle system (10) having a compressor (11), a condenser (12), an expansion valve (13), and an evaporator (14), the working medium thereof being controlled as described above.

Description

technical field [0001] The invention relates to a working medium for heat cycle and a heat cycle system. Background technique [0002] It is known to use hydrofluorocarbons (hereinafter , denoted as HFC.). However, HFCs are pointed out to possibly contribute to the greenhouse effect. For example, the greenhouse effect coefficient of 1,1,1,2-tetrafluoroethane (HFC-134a) used as a refrigerant in a vehicle air conditioner is as high as 1430 (100-year value). [0003] A thermal cycle system using a hydrofluoroolefin (hereinafter referred to as HFO) has been proposed as a thermal cycle system using a working medium that has little influence on the ozone layer and has little effect on the greenhouse effect. Since HFO not only has little influence on the ozone layer but also has a carbon-carbon double bond that is easily decomposed by OH radicals in the atmosphere, it also has little influence on the greenhouse effect. [0004] Specifically, the thermal cycle system of the foll...

Claims

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Application Information

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IPC IPC(8): C09K5/04F25B1/00
CPCC09K5/04C09K2205/126F25B25/005F25B43/003F25B2339/047C09K5/045C09K2205/22Y02P20/129C09K2205/122F25B1/00F25B31/002F25B43/00F25B2400/121
Inventor 福岛正人田坂真维
Owner ASAHI GLASS CO LTD
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