Low gwp refrigerant blends
A technology of refrigerants and compositions, applied in the direction of climate sustainability, chemical instruments and methods, heat exchange materials, etc., can solve problems such as shortage of coolants, rising prices of coolants, disrupting cooling and air conditioning industries, etc.
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example 1
[0339] The refrigerant compositions listed in Table 1 were identified as replacements for R410A in existing and new installations.
[0340] Table 1
[0341]
[0342]
[0343]A Toshiba reversible split air conditioner, Model RAS-137SAV-E3, containing 0.8kg of R410A was used to cool the room and the reversible split air conditioner was monitored using temperature sensors and pressure sensors placed as shown in Figure 1 , At the same time use the ammeter to record the electric power consumption of the compressor. The collected data are shown in Table 2a.
[0344] I(A) is the current in amperes drawn by the compressor.
[0345] T1 is a sensor placed in the airflow leaving the evaporator.
[0346] T2 is a sensor placed indoors.
[0347] T3 is a sensor placed in the airflow at the outlet of the condenser.
[0348] T4 is the sensor placed in the airflow entering the condenser.
[0349] T5 is a sensor placed on the refrigerant discharged from the compressor.
[0350] P1 i...
example 2
[0364] The refrigerant compositions containing R1234ze(E) and R1234yf listed in Table 2 were identified as potential replacements for R410A in air conditioning units by modeling their performance using cycle simulations based on thermodynamic data generated by NIST's REFPROP v10. The results indicate that blends 3 to 6 are acceptable substitutes for R410A. The flow rates are similar, so the capillary expansion tubes typically found in smaller split air conditioning units continue to function normally, thus avoiding costly retrofits. Under comparable conditions, the maximum working pressure occurring in the condenser is not less than 2 bar higher than that of R410A, which is within the typical ratings of split air conditioners. Its discharge temperature is 15°C higher or less than 15°C higher than that of R410A to avoid thermal decomposition of the lubricant or damage to other components. The GWP of the blends is less than 1000. Therefore, 1 ton of the blend can replace more t...
example 3
[0370] Refrigerant composition Blend 7 listed in Table 4 was identified as a replacement for R404A in existing units.
[0371] Table 4
[0372] Refrigerant# Chemical Name R404A blend 7 R125 Pentafluoroethane 44 11.4 R134a 1,1,1,2-Tetrafluoroethane 4 3.3 R143a 1,1,1-Trifluoroethane 52 0 R744 carbon dioxide 0 10.4 R1234yf 2,3,3,3-Tetrafluoroprop-1-ene 0 0 R227ea 1,1,1,3,3,3-Hexafluoropropane 0 7.4 R1234ze(E) E-1,3,3,3-Tetrafluoroprop-1-ene 0 56.1 R32 Difluoromethane 0 11.4 GWP 2088 733
[0373] In order to evaluate this performance, several days can be spent testing the composition in an actual unit. Therefore, a computer program is typically used to model the Rankine cryocycle, using the thermodynamic properties of the composition and important operating parameters as inputs to generate key performance criteria, as outputs, to first screen candidates. This type...
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