文档介绍：1 Air conditioner 2 Air conditioning systems have long ceased to be regarded as luxury equipment. Air conditioners have e a factor in active safety, and today can almost be considered as an integral part of a vehicle's safety specification. 10 years ago, only about 10 percent of all newly registered vehicles were fitted with an air conditioning system. By 1996, air conditioners were being installed as standard in more than one in four newly registered vehicles. Customer demand for air conditioning is rising continually. 3 Why air conditioning (1) People fortable at a certain ambien t temperature and atmospheric humidity. As ponent part of active safe ty, the driver's well- being is a key factor in driving ability. The “in-car climate“ has a direct bearing on the driver, fatigue-free driv ing and driving safety. fort curves fortable interior temperature is dependentupon the prevailing ambient temperature and upon sufficient air flow: Low ambient temperature, . –20 o C ? Higher interior temperature 28 o C ? High air flow rate: 8 kg per min. High ambient temperature, . 40 o C ? Low interior temperature 23 o C ? High air flow rate: 10 kg per min. Moderate ambient tem perature, . 10 o C ? Low interior temperature o C ? Low air flow rate: 4 kg per min. 5 Why air conditioning (2) Scientific studies conducted by the WHO (World ani zation) have shown that one's ability to concentrate and reactions are impaired when under stress. Heat puts a strain on the best temperature for the driver is between 20 and 22 o C. This is equivalent to climatic load A, the "comfort range". Strong sunlight can increase the inte rior temperature by more than 15 o C above the ambient temperature– particularly in the head area. This is where the effe cts of heat are most dangerous. The body temperature rises and the heart rate increases. Heavier perspiration will typically occur, too. The brain is not receiving enough refer to "climatic load