】 【Weak current college system perspective analysis of copper and aluminum connecting pipe air conditioning energy efficiency ratio-increase - Power By】 【China power house network.

<br> <br> Air conditioning energy efficiency standard entry level from the original 5-level (EER 2.6) directly to level 2 (EER 3.2), the standards will be implemented starting in March of this year. This means that the energy- .efficiency ratio of air-conditioning will prohibit 3.2 sales. The so-called energy efficiency ratio is at rated operating conditions and provisions of the conditions, the air conditioner for refrigeration at run time, the cooling capacity and effective input power ratio known as the energy .efficiency ratio (EER), this is an important energy-saving targets. <br> <br> 1. refrigeration system analysis <br> <br> Refrigerants in the air conditioning pipe system flow path is: compressor-reversing valve-condenser- .capillary - connecting pipe (fine)-evaporator-connecting pipe (rough) - 4-way reversing valves-hydraulic and muffler-compressor. Air conditioning pipe in the system only up to the transport function of refrigerant? the answer is no. .<br> <br> Will throttle the refrigerant liquid cooled prior to below the condensing temperature status, called supercooling. With cold cycle is called the cold cycle. By refrigerant thermal state diagram shows that, before the throttle undercooling of liquid, then cut the .dryness after X smaller circulation cooling capacity of the unit. Therefore, the refrigerant liquid cooling, to improve cooling capacity and refrigerating factor are favourable. Low temperature and low pressure of supercooled liquid refrigerant is through connecting pipe (fine) to the evaporator, the ideal .State is supercooling refrigerant only in the evaporator boiling draw near thermal evaporator, if connecting pipe insulation (thin), will improve the flow evaporator temperature of the refrigerant, reduce refrigerant liquid subcooling, thereby reducing the cooling capacity, impact energy-efficiency ratio. < .br> <br> In theory, the compressor suction of refrigerant gases before should become too hot. The conditioner, relied on the evaporator's further endothermic gas. Ideally, hot refrigerant can effectively prevent the hydraulic hammer, can also increase the cooling capacity, improve .cooling and refrigerating capacity per unit volume, it is important to note that the higher the heat absorption superheat, higher power consumption. Suction superheat is divided into harmful to overheat and useful heat. Unwanted heat is the evaporator heat hot after the draw on the environment .resulting from overheating. It allows refrigeration factor decline, condensing heat load increase, so bad, that is, the refrigerants in the evaporator to compressor connection tube between the (rough) pipeline in the ambient air thermal overheating, this is the amount of heat absorbed .by the steam, do not belong to the evaporator of cooling capacity, thermal cycle of refrigerating factor will reduce. <br> <br> The lower the temperature of evaporation, the harmful effects of excessive heat, such as R410A for evaporation temperature is- .51.4 ℃, R22 of evaporating temperature only-40.8 ℃, visible connecting pipe (rough) insulation condition good, new refrigerant R410A in greater energy efficiency due to R410A than can be done, so the connection 5.5 (rough) of insulation effect, or connected .select on R410A, really important. <br> <br> Refrigerants in the connecting pipe (rough) receiver caused by excessive heat, known as harmful to overheat. In order to reduce the harmful overheating, connecting pipe (rough) requires package insulation materials ., due to cost constraints cannot be completely eliminated, experience has shown that the use of the entire copper pipe, this harmful overheating temperature of 6 ° c. From this result, use the entire copper pipe is not a good choice, and copper and aluminum .connecting pipe is undoubtedly a very good choice to use copper aluminum connecting pipe temperature rise after harmful eased the situation should not only cost savings, but also to improve the energy efficiency ratio. <br> <br> Second, copper-aluminum connecting pipe < .br> <br> The outer wall temperature is higher than the pipe wall temperature, the heat through the pipe wall pass from outer to inner wall, thereby enhancing the supercooled liquid refrigerant (or hot gas refrigerant) of temperature, when in the same manner .as an outer insulation, temperature transmission speed depends on the material of the pipe conductivity. From copper, aluminium two materials analysis of thermal conductivity is evident, copper-aluminum connecting pipe connection than the entire copper tubes with a much lower thermal conductivity, thermal conductivity .of the aluminum tube is 2.04W / (cm. ° c), thermal conductivity of copper tube is 3.83W / (cm.), aluminum tubes heat capability is the heat conductivity of copper pipe, the pipe length 47% of this impact will .be greater. Copper-aluminum connecting pipe outside of cross-linked polyethylene pipe for heat conduction rate relative to the copper tube, only water lower 0.17W / (cm.), xlpe not only played a preservative effect, here real played isolation temperature delivery .results. <br> <br> Third, copper-aluminum connecting pipe specifications on the impact of energy-efficiency ratio <br> <br> The schedule is the domestic and international air conditioner factory selection of copper and aluminum connecting pipe specifications (foreign .copper aluminum connecting pipe for new refrigerant R410A) from which you can see that the choice of material abroad to pipe group aluminium tubes of diameters, because you chose and copper tube internal diameter same aluminum pipe, copper-aluminum connecting pipe system flow compared with all .-copper tube is almost no difference. In order to comply with new refrigerants R410A15MPa design requirements, increased the aluminum pipe wall thickness, low copper prices in the market, the foreign companies do obviously not merely from the point of reducing costs using copper and aluminum .pipe, the deep consideration is the use of thick-walled aluminium tubes and heat shrinkable tube heat preservation effect on the system, improving the new refrigerant R410A air conditioning energy efficiency ratio, it is certainly a kind of saving money and improving performance of win- .win solution. <br> <br> <br> <br> <br> <br> <br> <br> <br> <br>.