Composition for heat cycle system, and heat cycle system
To provide a composition for a heat cycle system which comprises a working fluid containing HFO-1123 and having cycle performance sufficient as an alternative to R410A while the influence over global warming is suppressed, and a heat cycle system employing the composition. A composition for a heat cycle system, which comprises a working fluid for heat cycle containing trifluoroethylene and having a global warming potential (100 years) in Intergovernmental Panel on Climate Change (IPCC), Fourth assessment report, of less than 675, and a heat cycle system employing the composition for a heat cycle system.
1. A composition for a heat cycle system, comprising:
trifluoroethylene (HFO 1123);
difluoromethane; and
1,3,3,3-tetrafluoropropene (HFO 1234ze);
wherein a total amount of HFO-1123 and HFO 1234ze based on the entire amount of the composition is at least 70 mass %, and
wherein a global warming potential of the composition according to the (100 years) Intergovernmental Panel on Climate Change (IPCC), Fourth assessment report, is less than 675.
2. The composition for a heat cycle system according to claim 1 , wherein of the working fluid for heat cycle, the relative coefficient of performance (RCOP R410A ) calculated in accordance with the following formula (1) is from 0.85 to 1.20:
Relative
performance
of
coefficient
(
RCOP
R
410
A
)
-
Coefficient
of
performance
of
sample
(
COP
sample
)
Coefficient
of
performance
of
R
410
A
(
COP
R
410
A
)
(
1
)
wherein R410A is a mixture of difluoromethane and pentafluoroethane in a mass ratio of 1:1, and the sample is the working fluid to be subjected to relative evaluation; and the coefficient of performance of each of the sample and R410A is a value obtained by dividing the obtained output (kW) by the required power consumption (kW) when each of the sample and R410A is applied to a standard refrigerating cycle under conditions such that the evaporation temperature is −15° C. (in the case of a non-azeotropic mixture, the average temperature of the evaporation initiation temperature and the evaporation completion temperature), the condensing temperature is 30° C. (in the case of a non-azeotropic mixture, the average temperature of the condensation initiation temperature and the condensation completion temperature), the supercooling degree (SC) is 5° C., and the degree of superheat (SH) is 0° C.
3. The composition for a heat cycle system according to claim 1 , wherein of the working fluid for heat cycle, the relative refrigerating capacity (RQ R410A ) calculated in accordance with the following formula (2) is from 0.70 to 1.50:
Relative
refrigerating
capacity
(
RQ
R
410
A
)
-
Refrigerating
capacity
of
sample
(
Q
sample
)
Refrigerating
capacity
of
R
410
A
(
Q
R
410
A
)
(
2
)
wherein R410A is a mixture of difluoromethane and pentafluoroethane in a mass ratio of 1:1, and the sample is the working fluid to be subjected to relative evaluation; and the refrigerating capacity of each of the sample and R410A is an output (kW) when each of the sample and R410A is applied to a standard refrigerating cycle under conditions such that the evaporation temperature is −15° C. (in the case of a non-azeotropic mixture, the average temperature of the evaporation initiation temperature and the evaporation completion temperature), the condensing temperature is 30° C. (in the case of a non-azeotropic mixture, the average temperature of the condensation initiation temperature and the condensation completion temperature), the supercooling degree (SC) is 5° C., and the degree of superheat (SH) is 0° C.
4. The composition for a heat cycle system according to claim 1 , wherein of the working fluid for heat cycle, the temperature glide is at most 8° C., which is represented by a difference between the evaporation initiation temperature and the evaporation completion temperature in an evaporator when applied to a standard refrigerating cycle under conditions such that the evaporation temperature is −15° C. (in the case of a non-azeotropic mixture, the average temperature of the evaporation initiation temperature and the evaporation completion temperature), the condensing temperature is 30° C. (in the case of a non-azeotropic mixture, the average temperature of the condensation initiation temperature and the condensation completion temperature), the supercooling degree (SC) is 5° C., and the degree of superheat (SH) is 0° C.
5. The composition for a heat cycle system according to claim 1 , wherein the value (TΔ) is at most 30° C., which is obtained by subtracting the compressor discharge gas temperature (T R410A ) when a mixture of difluoromethane and pentafluoroethane in a mass ratio of 1:1 is applied to the following standard refrigerating cycle, from the compressor discharge gas temperature (Tx) when the working fluid for heat cycle is applied to the following standard refrigerating cycle, the standard refrigerating cycle being conducted under conditions such that the evaporation temperature is −15° C. (in the case of a non-azeotropic mixture, the average temperature of the evaporation initiation temperature and the evaporation completion temperature), the condensing temperature is 30° C. (in the case of a non-azeotropic mixture, the average temperature of the condensation initiation temperature and the condensation completion temperature), the supercooling degree (SC) is 5° C., and the degree of superheat (SH) is 0° C.
6. The composition for a heat cycle system according to claim 1 , wherein the working fluid for heat cycle has a heat of combustion of less than 19 MJ/kg.
7. The composition for a heat cycle system according to claim 1 , wherein a content of the trifluoroethylene is from 10 to 80 mass %, a content of the difluoromethane is from 10 to 80 mass %, and a content of the 1,3,3,3-tetrafluoropropene is from 5 to 45 mass %, based on the working fluid for heat cycle.
8. The composition for a heat cycle system according to claim 1 , wherein a content of the trifluoroethylene is at least 20 mass % based on the working fluid for heat cycle.
9. The composition for a heat cycle system according to claim 1 , wherein a content of the trifluoroethylene is from 20 to 80 mass % based on the working fluid for heat cycle.
10. The composition for a heat cycle system according to claim 1 , wherein a content of the trifluoroethylene is from 40 to 60 mass % based on the working fluid for heat cycle.
11. A heat cycle system, which employs the composition for a heat cycle system according to claim 1 .
12. The heat cycle system according to claim 11 , which is a refrigerating apparatus, an air-conditioning apparatus, a power generation system, a heat transport apparatus or a secondary cooling machine.