Air conditioner Wikipedia

Whereas, until 1970, the birth rate in the spring was lower than during the other seasons, the introduction of air conditioning leveled out this difference at the end of the 20th century.Mortality rate was also affected, especially during the summer and in regions subject to heatwave; up to a 2% decrease from the 30s to the 90s. A portable air conditioner can be easily transported inside a home or office. Instead of plastic tubes mounted on the rear window package shelf as on GM cars, small ducts directed cool air toward the ceiling of the car where it filtered down around the passengers instead of blowing directly on them, a feature that modern cars have lost.Combining heating, cooling, and ventilating, the new air conditioning system for the Nash cars was called the "All-Weather Eye".Most competing systems used a separate heating system and an engine-mounted compressor, driven by the engine crankshaft via a belt, with an evaporator in the car's trunk to deliver cold air through the rear parcel shelf and overhead vents. Air conditioning systems, especially in commercial buildings, are the biggest contributors to peak electrical loads seen on hot summer days in various countries. High temperatures in metro system stations may be caused by train air conditioning. More surprising is the gradual movement of populations from northern states to southern states within those same 60 years. A portable system has an indoor unit on wheels connected to an outdoor unit via flexible pipes, similar to a permanently fixed installed unit. Portable air conditioners are either evaporative or refrigerative. "An additional possible disadvantage is that the cost of installing mini splits can be higher than some systems. However, now the market has a wide selection of multi-split systems, in which the functional characteristics of indoor units operate separately from each other. Capital expenditures are minimized because the chillers can be just 40 - 50% of the size needed for a conventional design. From the early historical period until the advent of powered cooling, ice was widely shipped and stored year-round in The most widely used form of this technology can be found in campus-wide air conditioning or chilled water systems of large buildings. If water cooled, the chiller is cooled by a cooling tower. The inverter air conditioning units have increased efficiency in contraction to traditional air conditioners, extended life of their parts and the sharp fluctuations in the load are eliminated. The plant circulates cold water to terminal chilled water devices such as air handlers or fan/coil units. Usage [edit | edit source] While fairly expensive, the A/C provides a positive bonus of up to +100 to both insulation values, helping to combat both cold and heat. The main external unit can be connected to several different indoor types: floor, ceiling, cassette, etc. First, the number of births became much less varied throughout the year. The Toshiba 6,000 BTU/h window air conditioner has The Toshiba 6,000 BTU/h window air conditioner has the power to cool up to 250 sq. The Airtemp was more advanced than rival automobile air conditioners by 1953. Flexible exterior hoses lead from the outside unit to the interior one(s); these are often enclosed with metal to look like common drainpipes from the roof. Air conditioners often use a fan to distribute the conditioned air to an enclosed space such as a building or a Since prehistoric times, snow and ice were used for cooling. The interior air is cooled as a fan blows it over the evaporator. air conditioning, engl. However, lower operating costs and Other common types of air conditioning system are multi-split systems, the difference between separate split system and multi-split system in several indoor units. Ice storage air conditioning is the process of using ice for thermal energy storage.This is practical because of water's large heat of fusion: one metric ton of water (one cubic metre) can store 334 megajoules (MJ) (317,000 BTU) of energy, equivalent to 93 kWh (26.4 ton-hours).. Ice was originally obtained from mountains or cut from frozen lakes and transported to cities for use as a coolant.

Products The outdoor unit must also be located in an open space, otherwise the heat from the house will not be effectively discharged outside and the productivity of the entire system will drop sharply. Air conditioning is common in the US, with 90% of new In China, the proportion of urban households with air conditioners increased from 8% to 70% in 9 years, from 1995 to 2004.Process applications aim to provide a suitable environment for a process being carried out, regardless of internal heat and humidity loads and external weather conditions. Assuming 1000 hours of operation during a typical cooling season (i.e., 8 hours per day for 125 days per year). Another method that yields the same result, is to calculate the total annual cooling output: für Luftkühlung, insbesondere Kühlung (Verbrennungsmotor) All Clear („alles löschen“) beim Taschenrechner; Alternating Current, engl. The first practical semi-portable air conditioning unit was invented by engineers at Split-system air conditioners come in two forms: mini-split and central systems. Note:the term "air conditioning" refers to any form of "Heating, ventilation and air-conditioning".This article deals specifically with units used as part of a cooling system. A Circulating refrigerant gas vapor (which also carries the compressor lubricant oil across the system along with it) from the evaporator enters the The warmer the air that reaches the evaporator, the higher the pressure of the vapor mixture discharged from it and therefore the higher is the load placed on the compressor and therefore on the engine to keep the refrigerant flowing through the system.

At larger scales, the ductwork required to move conditioned air to and from the plant would be impractically large, so an intermediate fluid such as chilled water is used instead. This is about 30% more than central systems (not including ductwork) and may cost more than twice as much as window units of similar capacity. At night, they produce ice for storage and during the day they chill water for the air conditioning system.