Small medium and large enterprises in the domestic refrigeration heat exchanger material selection for what is the basis? The following explanation is provided by Andre professional refrigeration:
1. Prices
To sum up, the heat transfer material most commonly used refrigeration equipment manufacturers are aluminum and copper and aluminum pipe. The use of aluminum, the most important reason for both copper and aluminum heat exchanger tube material reason for the price, it means in the case of the effect can still be, the price is cheaper, as the refrigeration industry best brass pipes and heat exchangers material should be understandable, after decades of development, the relevant professionals already done all the usual test material (do not listen to domestic manufacturers of all kinds of flicker in technology there are no major changes in the case - refers to the principle of change significant changes in the refrigerant - basic copper is No.1)
Wherein verifying the heat exchanger materials include a heat transfer coefficient, coefficient of expansion, ductility, corrosion resistance, ease of installation and so on, brass comprehensive win, but in recent years, fluctuations in the price of copper tube big exception, which also leads to change is very large refrigeration equipment manufacturers of cost, so do not need to be part of the high and low temperature cooling changeover refrigeration equipment manufacturers try to use aluminum and copper and aluminum pipe.
In fact, the biggest difference between brass and aluminum, is not the difference between the heat transfer efficiency, but a huge difference in coefficient of expansion and radiation resistance between the difference here is not specifically explain, and studied high school chemistry people know, the more active aluminum than copper!
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2. Cost-effective
It says that, under the effect of the gap is not the case, the price of copper cheaper than aluminum, which will be more out in the price gap is not large, the effect is better than copper, but copper, that is to say, copper in the refrigeration industry applications cost-effective than aluminum. On the refrigerant pipe is certainly better than the brass tubes, thermal conductivity of copper is about 400W / mK, the thermal conductivity of aluminum is about 250W / mK; brass pressure resistance than aluminum, not easily damaged.
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3. Principle
the most important point is:
Aluminum wire ------ Peng expansion coefficient 23.2X10 ^ -6 (1 / ° C)
Copper ------ linear expansion coefficient of 17.7X10 ^ -6 (1 / ° C)
Are seasonal open air conditioning, refrigeration conditions evaporator coil temperature and ambient temperature difference is big, with aluminum prone to breakage; evaporator refrigerator refrigeration almost the entire year, so it will not occur due to thermal expansion and contraction with the tubes resulting damage.
Combination of cold storage
Most of the refrigerator condenser is brass. So to speak, a large domestic enterprises to use large and small freezer are copper pipes, few companies use aluminum, so do not listen to domestic manufacturers specialized blowing hype, some will not and some can not, is more than Andre refrigeration equipment provided, on behalf of Andre thanks workshop master craftsman providing knowledge on the technical principles.
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