Air Conditioners

Air Conditioning industry strives for more efficiency for its cooling units and greater.

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By  Eudore Chand Published  November 27, 2003

|~|aircondt_200w.jpg|~|Zamil’s range of air conditioners spans all commercial, residental and industrial uses.|~|Zamil Air Conditioners is one of the major success stories in the race to industrialisation in the Gulf countries. The company was founded in 1974 and was the first to establish an air-conditioning manufacturing facility in Saudi Arabia.
Today it is the leading international manufacturer of air-conditioning systems and is the Number 1 manufacturer and supplier in the Middle East.

The company designs, makes, tests, markets and services a large range of air-conditioning products ranging from compact, room air conditioners and mini splits to large-scale, central, air conditioners, chillers and air-handling units for highly specialised applications. These are sold under brand names Classic, Cooline, Clima Tech, Kessler and Geoclima.
Besides this, the company also owns CoolCare, the leading service and maintenance provider for HVAC products in Saudi Arabia and the GCC region.

Such is the company’s reputation that names like Sanyo, Trane, Luxaire, Philco, Admiral, Siemens Bosch and Frigidaire used its OEM services, putting their brands on ZAC products. This reputation has been hard won. ZAC’s research and development department has tested and introduced many technologies and products recently to cope with customer requirements, new market segments and new standards of health care, in an effort to improve living conditions.
Current research ongoing in consumer products for window and mini-split air conditioners are aimed at producing higher purity air and enhancing the Internal Air Quality to improve the environment, especially in crowded rooms, and spaces with high carbon dioxide levels.

Besides the standard antibacterial filters fitted to mini-split systems, ZAC has added a new ionising filter to enhance the air purification process and generate a higher level of negative ions, which helps to neutralise dust and particles in the atmosphere, which usually carry a positive charge and encourages them to settle out of the atmosphere and so increase cleanliness and freshness.

The latest range of mini split systems, the GX/GL series, have a fun innovation. “Now you can talk to your unit via mobile telephones to switch them on/off, to set heat or cool mode, and to set the right temperature,” says Hashim Bunyan, director of research & development, at ZAC. The system to do this is called Telesmart. It is an optional module that uses the latest communications technologies and converts your digital coded inputs to commands understood by the smart air-conditioner, which then runs according to your instructions. The module can be placed anywhere in the room, and needs a connection to a telephone outlet and communicates with the AC unit microprocessor via infrared sensors only.

The fundamentals of cooling have not been overlooked either. A lot of work has gone into improving ZAC’s own coil technology, including the introduction of new fin patterns that extend the area available for air-to-refrigerant heat transfer. These new designs also increase ‘free cooling’ through dedicated coil circuits to sub-cool liquid refrigerant, and thus reduce the energy consumption and increase overall system efficiency.

For its unitary and applied products, the air-conditioning plants for large buildings, ZAC has been working with business partners Copeland to develop and deploy new digital scroll compressor technology to improve the overall efficiency of medium-size refrigeration plants in high ambient regions like the Middle East. This technology employs a modulation in system capacity, increasing part load efficiency and enabling for the first time a true multi-split system with full terminal capacities, as compared to the conventional multi-splits, VRVs and inverter units. These units will be launched in the next few months. On higher range systems, like packaged units and air handlers, higher indoor air quality (IAQ) systems have already been introduced in local and international markets. Most ZAC units are now equipped with economisers, incorporating state-of-the-art controls, carbon dioxide monitors that will activate fresh air intake if the levels of carbon dioxide go high, and an ultraviolet light source to destroy bacterial growth inside the AC equipment.

Energy efficiency ratio (EER) has been improved to meet new international levels with the use of combinations of scroll compressors and high-efficiency Zamil Heat Exchangers and other efficiency improvement designs and measures. ZAC screw-compressor chillers offer a package named Economiser that improves the cooling capacity by 8 to 12% in the range between 40-500 TR which increases EER by sub-cooling liquid refrigerant prior to the electronic expansion valve feeding the shell & tube barrels.

Although IAQ and energy matters are the core of ZAC research, other initiatives are also being pursued. New microprocessor controls and new-generation programmable logic controllers have been added to the ZAC unitary range of equipment and large packaged plants. These new controllers make it easy to monitor and control air-conditioning plants from remote locations, and by GSM technology or via the internet in some products.

After a successful introduction in Europe, GSM monitoring is soon to be launched in Saudi Arabia and the Middle East.
In general, ZAC microprocessors have been developed to cope with ever increasing customer demands for better monitoring and remote control and the new Microsmart generations enable customers to use a variety of communication protocols such as LAN or BACnet and Building Management Systems.

ZAC has been developing its capabilities as well as its products. There are new labs being added to the company’s research & development effort. A new lab to test life endurance and design qualification for consumer products is currently nearing completion and a new chiller testing lab, designed by Intertek Testing Company, ETL-Semko of Courtland, NY, USA, too is planned to be commissioned before the end of the year.

New upgrades will follow too on one of the calorimetric rooms and there will be upgrades for the design and research software, like Pro-engineering (PTC), Intralink, and the computational fluid dynamics. The result should be a faster response to an ever demanding market.
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The last published figures for world-wide sales of air-conditioning units were in 2000, with sales estimated at 39.7 million units. However, growth at that time was estimated to be over 10% in the fastest growing markets. Even in the maturest markets of the world, such as North America, sales were expanding by 3.1% per year. The world-wide sales increase was thought to be 8%, which would put today’s installed base at 49.2 million units. Revenue for the global air-conditioning market was put at US$35 billion in 2000. Using the same 8% per annum growth projection, the revenue for 2003 will top US$44 billion.
Source: Centre for Energy Studies, Paris

Big 5 preview of LG multi-concealed duct system

LG Electronics will debut its multi-concealed duct system, the first of its type with linear external static pressure controls at the Big 5 exhibition. The product is to go on sale in the Middle East & Africa next year.

“This system is more flexible for consultants, specifiers and end users,” explained Siraj Akbani, general manager, commercial air conditioners, LG Gulf FZE. “It offers independent temperature control, greater power saving and reduced maintenance costs. Two compressors are combined into one external chassis, which improves building design and reduces piping costs. This innovation will change the face of air conditioning design,” he added.
For more information: Tel: +9714 390 2961

Samsung pulse compressor for load matching

Samsung has become the first company to launch a range of air conditioners using PWM (pulse width modulation) compressor controls. The compressor automatically controls the cooling capacity of the unit, depending on the load. The unit also incorporates DVM (digital variable multi) technology operated by a variable-capacity compressor accommodated by multiple evaporators (indoor units).

Digital compression operates using a solenoid valve for loading/unloading between the upper part of the fixed scroll and the suction pipe. For loading, the valve is turned off and the fixed scroll is locked to the orbiting scroll, whereas the solenoid valve is turned on and the fixed scroll separated from the orbiting scroll for unloading. These two processes control the on/off times of the valve and the rotating refrigerants circling the system to adjust the capacity. The PWM controls the on/off signal transmitted to the solenoid valve for loading/unloading.

The modular configuration of the system provides other benefits, including easy installation and compactness. With a potential vertical height of 50 m and total pipe length 100 m, Samsung hopes the system will revolutionise the cooling of high-rise buildings. The system needs only simple planning and it can be installed at the early stage of construction, both of which mean it is likely to appeal to specifiers.
For more information: Tel: +971 4 222 5747

Carrier expands its Aero CENTRAL STATION UNIT FAMILY

Carrier has expanded its Aero range of central station air handling units. The new Aero 39R, available in sizes 72 to 110, is able to handle an air flow of up to up to 55 000 CFM. The new unit shares the Aero range characteristic rugged modular construction, installation flexibility, superior acoustics and custom air handler features.

The company has also expanded its 39M model up to size 61. The structural frame constructed with prepainted laminate panels easily meets most design conditions while maintaining structural integrity. To prevent the spread of bacteria through the system, an antimicrobial coating is applied to each unit’s inner panel liner to suppress the growth of bacteria, moulds, mildew, fungi and other microbes. A sealed panel double wall R-13 insulation system means no exposed insulation, which helps to keep insulation fibres from entering into the air stream.
For more information:

Trane focus on efficiency and reliability

Trane’s latest residential system, the XL19i, was developed with efficiency and reliability in mind and, at the same time, to make it easy for dealers to install. Dual Climatuff compressors provide two-stage cooling and, when matched with a variable-speed indoor unit, allow for greater humidity control.

“The introduction of the new XL19i answers our customers’ desires for an air conditioning unit that is easier to install and service along with meeting their customers' expectations for the highest efficiency and quality available today," says Jamie Byrne, sales manager for Trane. “Our customer base has high expectations for their systems and we are excited to give them one more option for meeting their cooling needs,” he added.

Airflow has been improved with the XL19i. The Comfort-R system can remove up to 90 l of moisture a day, compared with only 23 l removed by a single-speed system. The XL19i system achieves its very high efficiencies and moisture-removal rates using matched outdoor and indoor units. This combination delivers a true 50% capacity on first stage cooling and 100% capacity on second stage, resulting in the delivery of a comfortable air conditioning experience possible.
Trane also claims that the unit’s Seasonal Energy Efficiency Ratios are the highest in the industry.
For more information:

Clean air a priority all year round

National’s new Split AC model incorporates technical advancements for powerful cooling to provide clean fresh air with low noise and contributes to low electricity bills.
“The new Split AC model being introduced is particularly suited to the year-round heat in the Gulf region where the emphasis is on securing the most energy efficient cooling system,” said Hiroyuki Matsukawa, product manager, air-conditioners, Panasonic Marketing Middle East FZE.

However, the year-round need for air conditioning in the Gulf does increase the risk of spreading harmful viruses and bacteria. Recognising this, National has fitted its new models with a Catechin anti-virus air-purifying filter. The filters ensure a clean, healthier and odour free atmosphere by filtering harmful particles, inactivating viruses and removing unpleasant odours from the air.

National’s new range also includes ducted type, ceiling type, cassette type, wall-mounted type and window type systems that can be combined to meet the users specific requirements.
For more information: Tel: +971 4 881 9880||**||

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