Air-conditioning equipment

In general, air conditioning equipment can be classified into two broad types central (sometimes called field erected) and unitary (or packaged). 

State line Center point to Process Final air conditions Equipment used... 

If air conditioning systems are designed for buildings housing electrical equipment, the heat generated by the electrical equipment must be considered when sizing the air conditioning equipment. Artificial heat is seldom required in all but the coldest of climates. 

Selection of air conditioning equipment depends on balancing various criteria, including performance, capacity, special requirements, initial and continuing operating costs reliability flexibility and maintainability. 

Overall efficiency of air conditioning equipment steadily rose starting in the mid-1970s, attributed to consumer demand, government mandate, and incentive programs. For example, the average efficiency, as expressed in seasonal energy efficiency ratio, of new central air conditioners increased about 35 percent between 1976 and 1991. After national standards took effect in 1992, efficiency has increased as much as another 15 percent. 

A large proportion of refrigerating and air-conditioning equipment is now fully automatic in operation, but that does not absolve the user from the responsibility of understanding how it operates and being able to observe this operation. If this is not done, or if there is no other way of monitoring performance, the plant may run abnormally for some time before a fault is noticed, by which time considerable damage may have occurred. 

Accumulated dirt on air filters will increase the resistance and lead to reduced air flow. This is by far the most frequent cause of malfunction of air-conditioning equipment. 

Since a large proportion of refrigeration and air-conditioning equipment will be bought on the basis of catalogue data, an analytical approach should be adopted to ensure correct selection. The principles to be applied are those of value analysis — to start with the basic need and no preconceived method, to consider all the different methods of satisfying the need, and to evaluate each of these objectively before moving towards a choice. 

Mickley, H. S. Chem. Eng. Prog. 45 (1949) 739. Design of forced draught air conditioning equipment. 

Freon is a commercial trademark for a series of fluorocarbon products used in refrigeration and air-conditioning equipment, as aerosol propellants, blowing agents, fire extinguishing agents, and cleaning fluids and solvents. Many types contain chlorine as well as fluorine, and should be called chlorofluorocarbons (CFCs) [85,86]. 

INFICON builds leak detectors with quadrupole mass spectrometers to register masses greater than helium. Apart from special cases, these will be refrigerants. These devices thus serve to examine the tightness of refrigeration units, particularly those for refrigerators and air conditioning equipment. 

Heating, ventilation, and air conditioning equipment should be regularly inspected and maintained. Filters on environmental control equipment should be inspected on a regular basis and changed as needed. 

Climate. If the plant is located in a cold climate, costs may be increased by the necessity for construction of protective shelters around the process equipment, and special cooling towers or air-conditioning equipment may be required if the prevailing temperatures are high. Excessive humidity or extremes of hot or cold weather can have a serious effect on the economic operation of a plant, and these factors should be examined when selecting a plant site. 

Subjects 1 and 2 live in an air-conditioned apartment of 5 rooms (5088 cubic feet), in which air-conditioning equipment operated intermittently during the period of observation. In effect, it is one big room since the doors to the two bedrooms are rarely closed and there are no doors between the living room, dining room, and kitchen. Five Vaporizers were installed in this area and changed at the frequency indicated above. 

Second, the vacuum tubes were very bulky. Computers like the first computer, ENIAC, often took up enough cabinets to fill an entire floor of a building, with the computer in one room and the air conditioning equipment in the one next to it. 

Basically an air-conditioning system consists of a fan unit which forces a mixture of fresh outdoor air and room air through a series of devices which act upon the air to clean it, to increase or decrease its temperature, and to increase or decrease its water-vapor content or humidity. In general, air conditioning equipment can be classified into two broad types central (sometimes called field erected) and unitary (or packaged). 

Antimicrobial AlphaSan is a silver-based antimicrobial product produced by Milliken Chemical of the USA. This article informs us that the product has received US Environmental Protection Agency registration for use in heating, ventilation, and air conditioning equipment and related materials. Details of the product are provided. 

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