Air conditioning Teacher ： Ru-Li Lin Student ： 49814076 Chen-Hui Wu 49814060 Wei- chiuan Huang Department of Mechanical Engineering Southern Taiwan University.

Air conditioning

Teacher ： Ru-Li Lin Student ： 49814076 Chen-Hui Wu

49814060 Wei-chiuan Huang

Department of Mechanical Engineering Southern Taiwan University of Technology

Outline History Air conditioning applications The type of air conditioning Power Insulation Health effects Compare

History

More than a thousand years ago, the Persian invention of an antique air-conditioning system, the use of devices in the roof of the wind lever, through the cold water to the outside of the natural wind and blown into the indoor, indoor feel cool.

In the 19th century, British scientist and inventor Michael Faraday, compression and liquefaction certain gases can be frozen air, this phenomenon of evaporation of liquefied ammonia, when their ideas are still streaming in theory.

July 17, 1902, the name was graduated from Cornell University in young people a year, the work of the "buffalo" (Buffalo Forge Co.), Invented the air conditioner. Originally invented the purpose of air-conditioners, not for people to bring a comfortable living environment, but for some dead.

printing presses due to air temperature and humidity changes, the paper expansion and contraction uncertain, ink the position not, can not produce a clear color print . Then turn to the buffalo company. Carrier thought can take advantage of the air through the coil full steam to keep warm, why not use the air through the coils filled with cold water to cool down? The water in the air will condense on the coil, a result, the air inside the factory will both cool and dry.

July 17, 1902, the era of air conditioning by printing the first use of air conditioners and began. Soon, other industries such as the textile industry, chemical industry, pharmaceutical industry, food and even the arms industry, due to the introduction of air-conditioning of the product quality greatly improved. In 1907, the first export of air conditioning, the buyer is a silk factory in Japan.

Air conditioning applications

Air conditioning engineers often air-conditioning applications roughly divided into the comfort applications "and" process applications.

Efficiency assessment

EER (Energy Efficiency Ratio), energy efficiency ratio of cooling capacity divided by the number of watts of power consumption per hour, so the higher the value of air conditioning EER is usually more power.

EER = cooling capacity (BTU / hr Kcal / hr) / input power (W)

COP (Coefficient of Performance), the coefficient of performance, take away the heat, air conditioning in unit time divided by the power it consumes.

COP = Freezing capacity (Kw) / power consumption (Kw) unit w / w (1w / w = 0.86kcal/hr)

Refrigeration cycle ： Schematic diagram of the refrigeration cycle: 1) condensing coil, 2) expansion valve, 3) evaporator coil, 4) compressor

The type of air conditioning

Humidity ： Refrigeration and air conditioning materials usually reduces the humidity of the process air.Evaporator coil has to deal with air water vapor condensation, the moisture will go after a sewage pipe flow, so will go in addition to water vapor in the freezer space, and the relative humidity decreases.

Refrigerant ： The fluorocarbon compound is substituted with fluorine Methan Athan, and other hydrocarbons in the hydrogen-containing part or all of a compound obtained.

The type of Refrigerant

Characteristics and material cases

The main purpose

CFC (Chloro Fluoro Carbon) 

Chlorine-containing substances, the possibility of damage to the ozone.

Refrigerant ... refrigerators, commercial cryogenic equipment, automotive air conditioningFoaming agent ... cleaning agent, aerosol propellant

HCFC(Hydro Chloro Fluoro

Carbon)

Small possibility of chlorine-containing substances, it contains hydrogen, the formation of ozone layer destruction.

Refrigerant ... refrigerators, commercial cryogenic equipment, residential air-conditioningFoaming agent ... cleaning agent, aerosol propellant

HFC(Hydro Fluoro Carbon) 

The hydrogen-containing chlorine-containing substance, without damaging effect on the ozone layer.

Refrigerant refrigerators, commercial cryogenic equipment, auto air conditioning, small air conditioningFoaming agent ... cleaning agent, aerosol propellant

Absorption refrigerating machine ： The high temperature and high sets of water and high temperature flue gas equipment to drive the absorption refrigeration units "cold water system.System of cold water can be taken out through the end of heat to the cooling air.

Power

The power of the air conditioning equipment in the United States usually with a professional term "cold tons to express.

The cooling a USt ice 24 hours to dissolve the required cooling power.

Houses of central air-conditioning systems usually capacity of 1-5 tons of cooling.

Insulation

Insulation can reduce the energy required by the air-conditioning system.Thicker walls, reflective roofing materials, insulation glass, curtains and the building next to the trees, can reduce the energy demand of the system to consume less electricity bills.

Health effects

Many air conditioners only very ordinary filters, filter dust and prevent mold breeding ground for a very limited effect, dust and mold can accumulate in the duct air conditioners, heat exchanger and fan, most air conditioners in many places by professionalwho disassemble to wash to occasional cleaning by hand, air conditioner, but will degrade the air quality.Resulting in decreased air quality, to improve allergy, asthma prevalence.

CompareWindow-type air-

conditionersSplit

air conditioners

cheaper expensive

Sound noisy sound small

single room use can be one-to-many

less restricted mounted directly

available

install outdoor unit

Variable Frequency Air-Condition

Frequency conversion air-conditioning compressor can be controlled through our supply frequency of the heart per minute probable minimum low to about 800 per minute multi-turn, up to a maximum of 3300 revolutions per minute.Because the frequency is changed, the speed of change of the degree of supercooling, cooling degree of accuracy to change the sound operation of change, electricity consumption has also changed

Characteristics of frequency conversion air-conditioning

Item Variable Frequency Air conditioners

General air conditioners

Compressor DC brushless the efficient dual rotary cylinder, adjustable capacity

range, and silent power saving.

Usually lower conversion efficiency of the

compressor, and a smaller range of tunability.

Control mode PAM + PWM dual modulation to improve the power factor of 99%.

PWM power than the power of only 90%

Temperature control

The somatosensory Fuzzy control can be adjusted to provide a comfortable environment.

The general thermostat, set the temperature can

not be fine-tuning.

Dehumidification function

Ultra-low-frequency operation, dehumidification cooling.

Dehumidifying when the room temperature will

decrease.

References

http://zh.wikipedia.org/wiki/%E7%A9%BA%E6%B0%A3%E8%AA%BF%E7%AF%80#.E9.9A.94.E7.86.B1

http://taiwandaikin.ge-light.com.tw/tier/front/bin/ptdetail.phtml?Part=COLD&Category=100108232

http://www.liveincn.net/archiver/?tid-9016.html

http://15907458.aestore.com.tw/product-detail.asp?lang=1&pid=PD-100820-018967#p

References

http://www.sanyoteco.com/catalog/product_info.php?products_id=2739

http://www.mixed-refrigerant.com/photo/pl473963-non_ozone_depleting_azeotrope_r508b_mixed_refrigerant_gas_replacement.jpg