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Air conditioning system technology development trend
【Date】 2012Years10Month8Day   【Browse】 [3006]

1 auto air conditioner market entered a new stage of development

With the steady growth of China's economy, people's living standard and consumption levels have a corresponding increase, the number of car owners are more and more, thus driving the car by the requirements of comfort with higher standards, the automotive air conditioning industry also emerge as the times require. -MF

In the global automobile electron industry scale continued to increase, the rising proportion of application of large environment, along with the Chinese car retains the quantity and sales increase, and consumers on car ride comfort pursuit, makes the Chinese market to further expand the scale of automobile air conditioner. According to 2005 our country market sales of automotive air conditioning 3390000, grow 32.94% compared to the same period,

Sales reached 2600000000 yuan, grow 30% compared to the same period. From sales growth situation, 2005 China automotive air conditioning market growth higher than the growth rate of around 15% year market,

But we should also see the demand in the market, behind the rapid growth, China automotive air conditioning market is entering a new stage of development, the market competition further, showing a series of new features.

User perceptions are changing. Now, as China's economy grows steadily continuously, dweller income has increase certainly, living standard and consumptive ability also rises accordingly, consumptive idea also is in gradually changing, more and more people began to pursue a life of comfort. This is reflected by the consumption of cars, as embodied in the pursue of automotive interior trim, installation of multimedia systems and automotive air-conditioning, and humanized design. For example, now truck air conditioning installation rate is greatly improved, before the user that truck is money, the installation of air conditioning is not necessary, but now more and more users think while cargo is money, but money can not earn too hard, also began optional automobile air conditioning and high sound not prepared. Can foresee, along with the end-user consumption concept changes further, will promote the automotive air conditioning products marketing.

Product demand individuation. Automobile air conditioner direct user is vehicle manufacturers, end users are consumers, therefore, the market for automotive air conditioning product demand by vehicle manufacturers and end the influence of consumer. From the point of view of vehicle manufacturers, different types of vehicle to automobile air conditioning requirements are not the same, such as truck air conditioning and car air conditioning is not the same, and each car may need to have special physical design of automobile air conditioner, which can be seen the vehicle manufacturers of car air conditioning demand is extremely personalized accordingly, automobile manufacturers, according to OEM requirements for the development of customized automotive air conditioning products. From the end user 's perspective, while consumers may be air-conditioned car on the physical or technical feature is not very understanding, but consumers through the automobile air conditioning brand and use effect to evaluate. In addition, as China's auto market competition further intensifies, especially the car market, the introduction of new products faster, and each new car launch will require new automobile air conditioner with matching, that is to say the car air conditioning product life cycle is becoming shorter and shorter, needs further personalized development.

Technology development of environmental protection and energy saving of. In international environmental protection trend under the influence, automobile air conditioning environmental problems caused by automobile related groups concerned, automotive air conditioning technology is towards environmental protection. Ask development. Automotive air conditioning system with refrigeration, heating, defrosting, defrosting, air filtration and humidity control function. Although the car fuel heat sufficient to provide car heating and defrosting needs, but efficient gasoline and diesel engine combustion efficiency, fuel heat will be further reduced; and the electric vehicles and hybrid electric vehicles have to sacrifice driving performance to provide heating and cooling, so we must raise the automobile air conditioning system efficiency to reduce vehicle dynamic load. For a new generation of environmentally friendly vehicles, such as electric, hybrid, fuel cell and other low emission vehicle, because of their power is much smaller than the traditional vehicle, to provide air conditioning system power is extremely limited. In view of this, to provide energy efficient, reliable performance of the air conditioning system on the market is essential, it will be some time in the future, China automotive air conditioning technology development direction.

As a kind of special air conditioning equipment, automotive air-conditioning and household air conditioning compared with its own characteristics, that is the sales and vehicle production and sales of close contact, detached from the vehicle manufacturing industry, automobile air conditioning is no value. China auto market in the early twenty-first Century obtained two blowout type growth, begin in recent years Chinese car market slowdown, into the stationary growth phase. The vehicle accessory products, automotive air conditioning market and automobile market has the same change party asked, so automotive air conditioning growth rate also as the vehicle slowed slowed. China's auto market has entered a stage of steady growth, in the next five years will maintain 15% growth rate; accordingly, China automotive air conditioning market growth will maintain a steady growth rate.

2 automotive air-conditioning system has become one of the main means of competition in auto market

In recent years, environmental and energy issues become the focus of world attention, impact of the automobile industry has become a key factor in development, a variety of alternative energy sources in the car, for automotive air-conditioning industry offerred new task and challenge. International automobile market competition is fierce day by day, in order to obtain the market, production of cheap, safe, comfortable and low emissions vehicle is a major automobile manufacturers to target, automobile manufacturers constantly according to the user's requirements and expectations of updated car design, through the use of new technologies to provide better performance, and whether or not the need to increase the cost mainly depends on the benefits ( such as environmental protection ) is sufficient to compensate. ? \6w

Motor vehicle air-conditioning systems as affecting the comfort of one of the main assembly, for the vehicle to provide refrigeration, heating, defrosting, defrosting, air filtration and humidity control function. Wherein, heating system enables the occupant to avoid excessive wear, for windows provide demisting and defrosting function, to provide comfort and security services; air conditioning system by refrigeration, dehumidification to provide comfort, by making the driver alert window, allowing such measures provide security services; heating and air conditioning system may also provide dust, deodorizing function. These features have become the essential requirements of vehicle. Although the car fuel heat sufficient to provide car heating and defrosting needs, but the recent development of the high efficient gasoline, diesel engine waste heat to be reduced further, electric and hybrid cars will have to sacrifice driving performance to provide heating and cooling, so we must improve the efficiency of the automobile air conditioning system to reduce vehicle power burden.

For a new generation of environmentally friendly vehicles, such as electric, hybrid, fuel cell and other low emission vehicle, because of their power is much smaller than the traditional vehicle, able to provide air conditioning system power is extremely limited. A set of energy-saving and efficient, reliable performance of the air conditioning system on the market is essential.

3 new technology of automotive air conditioner

External regulation of variable displacement compressor. At present, in the German Volkswagen use external regulation of the variable displacement compressor mainly electrical equipment company 7SEU16, 7SBU16 and 6SEU12. Its working principle and internal regulation of the variable displacement compressor and similarity, difference is the control valve having a solenoid unit, control and display unit from the evaporator outlet temperature sensor signal as the input information, thereby to the compressor power stepless regulation. The control valve is composed of mechanical elements and electromagnetic unit. Mechanical components according to the low pressure side of the pressure control valve by means of a low pressure area of the pressure sensitive element to affect regulation. Electromagnetic unit consists of a control and display unit E87 500Hz through the on-off frequency control. In the current state, the valve opening, a high pressure chamber and compressor crankcase is communicated with the high pressure cavity pressure, and the crankcase pressure balance. Full load, the valve is closed, the crankshaft box and a high pressure cavity between the channel is blocked, the crankcase pressure drop, the inclination angle of the swash plate is increased until it reached 100% displacement; turn off the air conditioning or the required refrigerating capacity is low, the valve opens, the crankcase and a high pressure cavity between the channel is opened, oblique disc tilt angle decreases until less than 2% displacement. When the system pressure is higher, the vacuum bellows is compressed, valve tappet is loosened, continue to move down, allowing the high pressure chamber and a crankcase is further isolation, so that the compressor reach 100% displacement; when the suction pressure of the system is particularly low, the pressure element is released, the tappet adjusting stroke is limited, the means a high pressure chamber and a crankcase can no longer be completely cut off, so that the displacement of the compressor is smaller.

New structure of belt pulley. External control variable displacement compressor has used the new structure belt pulley. Belt pulley by a belt wheel and a follower wheel component, through a rubber element will pulley and the follower wheel strongly connected. When the compressor is damaged and blocked, with the wheel and the pulley between the rubber element transfer force increases rapidly in the direction of rotation, the pulley rubber element extrusion to the death card along with the wheel, rubber element to generate deformation, with the wheel to generate pressure increases, the follower wheel is deformed until the follower wheel and the belt pulley from the connection between, thereby avoiding the belt transmission damage.

The follower wheel deformation depends on the rubber element temperature, the elastic rubber element depends on the structure of the temperature. Because the rubber element and a follower wheel deformation, avoiding the engine belt drive while preventing damage, such as pumps and generators damage, has overload protection function.

External regulation of the variable displacement compressor has the advantages: compressor running, no joint impact, the comfort is improved by adjusting the temperature of the evaporator; the refrigerating capacity and the heat load and energy consumption of perfect matching, reduce the reheating process, with the outlet temperature, humidity regulator; because the displacement can be reduced to nearly 0%, omits clutch the quality loss of 20% ( about 500 ~ 800g); the compressor power consumption, fuel consumption decreased; the new structure of the belt pulley for belt transmission and air conditioning compressor between the force transmission, eliminates the torque fluctuation and at the same time overload protection function.

Condenser assembly. The condenser assembly is characterized by a liquid storage drier as a whole welding in the condenser side, thereby eliminating the connecting pipe and the two bolts, and the collecting pipe and collecting pipe are arranged in parallel between the openings instead of liquid storage drier. In order to reduce the installation space, the liquid storage drier relative to the surface of the condenser of unsymmetrical arrangement. Simulation and bench test showed that, when the condenser portion of the heat transfer surface for refrigerant subcooling, refrigeration equipment refrigeration power will increase, the undercooling of 15K reached a maximum value, and no supercooling can be compared to improve 4%. Maximum refrigeration power value nearly and the working status of a device independent.

The method of refrigerating device for a certain amount of excess charge and get too cold, so that the cooling power can be improved, through the refrigerant to the condenser back to make a part of heat transfer surface for cold. The disadvantage of this method is that, supercooling degree in different driving conditions will have a great change in the refrigerant; smaller loss situation, supercooling degree will soon be gone. In addition to the resulting power loss, the liquid tube saturated liquid refrigerant receiving fewer calories or have less pressure loss immediately when boiling, steam from the expansion valve to the adjusting range limit, which leads to the evaporator outlet refrigerant superheat increases, so that the heat transfer area utilization rate drop. In the compressor frequently switching in working process, due to pressure changes in the combined effects of enhanced boiling process, liquid pipe steam in large quantity in the expansion valve can have serious ultra high pulse noise. The condenser assembly to avoid the disadvantages, liquid storage drier lower liquid refrigerant through the openings into the condenser of the cold section for further cooling. By selecting the subcooler area can be structurally identified a need for the undercooling value. The condenser assembly has advantages as follows: lowers the car production plant in the production, logistics and installation costs; reduce the repair workload; reduces the required amount of refrigerant, thereby further improving the environmental protection air conditioning device. End users will benefit from the larger filling quantity range and long time can keep the optimum power and comfort.

4 reduction in direct or indirect discharge means

Car dynamic update and the application of new technology of automotive air conditioning system, put forward the new challenge, also give a lot of new technology applications to create opportunities. " Montreal Protocol " provisions, the original in automobile air conditioning system using refrigerant CFC12, for use in developed countries has ceased in 1996, in developing countries in 2006. As a result of the effort of each respect,

CFC12 has been gradually replaced by HFC134a, China since January 1, 2001 has been banned in the new production of vehicles using CFC12 as refrigerant in automobile air conditioner. HFC134a ODP ( atmospheric ozone layer depletion index ), GWP ( zero greenhouse effect index ) for 1/6 CFC12, nonflammable, low toxicity, refrigerating capacity and system performance and CFC12 comparative advantages, so as the transitional " alternative refrigerant in the world to be recognized, but because of its greenhouse effect index still higher ( CO2 1300 times), have been included in the Kyoto Protocol, restricting development of category.

The direct and indirect greenhouse gas emissions depend on the air conditioning system and its components in the design level and quality of products, at the same time with the vehicle running environment of temperature and humidity. On the refrigerant, direct emission rate is mainly affected by the system working pressure effects, while the environment temperature and the input power of the compressor is also determined by the refrigeration system working pressure. Indirect emissions mainly by the production system, the energy required to guarantee a certain comfort must be supplied by the cooling capacity and efficiency of the refrigeration system decision. In some cases, fuel consumption caused by indirect emissions is far greater than the refrigerant leakage caused by the direct emissions, especially in the scrap prior to the use of a refrigerant recovery device. In some climates because few use air conditioning, direct emissions are a major part of the LCCP.

Reduce the direct emissions: in repair and scrap vehicles using refrigerant recycling equipment; improve parts quality reduce leakage, reduce hose leakage rate and minimizing the length of hose, improved pipeline joint, where possible, in the "closed" structure to replace the open type compressor shaft seal; reduced refrigerant charge weight; the use of low GWP value and proper steam pressure, the permeability decreases refrigerant.

Reduce fuel consumption caused by indirect emissions:

One is by increasing the thickness of the insulating layer, improve carriage car, reduce the heat sealing glass (such as the use of light selective glass, insulation film ) and other measures to reduce the heat load of train. Two is the compressor capacity control, to reduce excessive refrigeration and heating and energy loss caused by. Such as Japan electrical equipment development of electronically controlled variable displacement compressor with electromagnetic valve instead of the original variable displacement compressor pneumatic valve, the compressor gas can be in 0~ 100% continuous regulation, this structure not only energy, but without the need to install the clutch, and reduce the quality of the compressor, and greatly improves the system reliability. The three is through control, reduces friction, heat, improving the heat transfer and other measures to improve the energy utilization efficiency of system components. The heat exchanger will be the traditional condenser, a liquid storage device, a drying filter and a subcooler synthetic one, can ensure that the throttle valve in front of the supercooling degree and improve efficiency, and for reducing the reservoir volume and can reduce the quantity of refrigerant; four is the use of efficient components in order to reduce quality; five is used the new system or new refrigerant to achieve better LCCP value, and to provide a satisfactory heating, cooling, dehumidification, defrosting, defrosting and humidity control performance. As of vehicles in winter by introducing external air heater demister ( new car interior

The last:With cold storage function of automobile air conditioner
The next:Automobile interior air standard draft completed
 
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