At present, the most refrigerants used in air water heater by manufacturers
are R22,R134a, R415b, R417a, has different characteristics for air water
heaters, following these several refrigerant characteristics and uses are
described.
R22 for air conditioning is very appropriate, because the condensation
temperature is always controlled at 45 degrees below (because the air
temperature is almost always below 40 degrees); but air water heater
temperature is always asking for more than 40 degrees,the temperature
of R22 is easy up more than 40 degrees.Therefore, R22 for air water
heaters because of the R22 exhaust temperature is high, causing the co-
mpressor lubricating oil cooling is not good, the cracking rate accelerated
dramatically, and so shorten the compressor life.
Belong to environmentally friendly refrigerant R134a (CH2FCF3), exhaust
gas temperature is also low, but its boiling point (standard atmospheric
pressure) to -26.5 degrees,which can cause low efficiency of air water
heaters in the winter because the refrigerant evaporation is slow so we
can see that R134a is suit for indoor refrigeration equipment, or tropical
regions, the northern outdoor refrigeration equipment is not used.
R415b, mixed refrigerant, invented by the Department of Professor
Zhu Mingshan, Tsinghua University (United Nations Environment
Programme International Refrigeration and Air Conditioning Heat
Pumps Technical Committee) International Institute of Refrigeration
uniform number: R415A, R415B, R418A, R425A.Its ODP is zero,
and 417a, the exhaust temperature is slightly higher. R415b replace
the R22, the system heating capacity of about 10% of the attenuation.
R417a mixed refrigerant (HFC-143, HFC-125 and R600), R417a
environmentally friendly, efficient and low exhaust temperature.
More suitable for the air water heater,the air conditioning from china
exports to Europe most use R417a.By the same air conditioning, with
R417A than R22 in efficiency up to 13% .
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