General Technical/Engineering Staff
We supply technical, operational, managerial professionals and engineer staff to many different companies based in Middle East (Saudi Arabia, U.A.E, Qatar, Kuwait, Oman…)
Our consultants include mid to senior-level technical, operational and managerial professionals, ranging from analysts, geologists, well site supervisors and reservoir engineers. Our success is the result of total commitment to a collaborative and cooperative approach to our project teams to provide quality, reliable and cost-effective solutions to our client’s needs.
We have provided for our esteemed clients the categories as below :
- HVAC TECHNICIAN
- TV/VCR TECHNICIANS
- MAINTENANCE REPAIR & SERVICE TECHNICIAN
- CAD TECHNICIAN
- WAREHOUSE TECHNICIAN
- EQUIPMENT TECHNICIAN
1. Reads blueprints, wiring diagrams, schematic drawings, and engineering instructions for assembling electronics units, applying knowledge of electronic theory and components.
2. Fabricates parts, such as coils, terminal boards, and chassis, using bench lathes, drills, or other machine tools.
3. Assembles circuitry or electronic components, according to engineering instructions, technical manuals, and knowledge of electronics using hand tools and power tools.
4. Tests electronics unit, using standard test equipment, to evaluate performance and determine needs for adjustments.
5. Adjusts and replaces defective or improperly functioning circuitry and electronics components, using hand tools and soldering iron.
6. Designs basic circuitry and sketches for design documentation, as directed by engineers, using drafting instruments and computer aided design equipment.
7. Assists engineers in development of testing techniques, laboratory equipment, and circuitry or installation specifications, by writing reports and recording data.
1. Installs electrical wiring, equipment, apparatus, and fixtures, using hand tools and power tools.
2. Maintains and repairs or replaces wiring, equipment and fixtures, using hand tools.
3. Plans layout and installation of electrical wiring, equipment and fixtures consistent with specifications and local codes.
4. Inspects systems and electrical parts to detect hazards, defects, and need for adjustments or repair.
5. Tests electrical systems and continuity of circuits in electrical wiring, equipment, and fixtures, using testing devices, such as ohmmeter, voltmeter, and oscilloscope.
6. Diagnoses malfunctioning systems, apparatus, and components, using test equipment and hand tools.
7. Readies and assembles electrical wiring, equipment and fixtures, using specifications and hand tools.
8. Prepares sketches of location of wiring and equipment or follows blueprints to determine location of equipment and conformance to safety codes.
9. Climbs ladder to install, maintain or repair electrical wiring, equipment and fixtures.
10. Constructs and fabricates parts, using hand tools and specifications.
11. Possesses electrician’s license or identification card to meet governmental regulations.
12. Directs and trains workers to install, maintain, or repair electrical wiring, equipment, and fixtures.
What is HVAC?
Heating, Ventilating, and Air Conditioning (HVAC) equipment perform heating and/or cooling for residential, commercial or industrial buildings. The HVAC system may also be responsible for providing fresh outdoor air to dilute interior airborne contaminants such as odors from occupants, volatile organic compounds (VOC’s) emitted from interior furnishings, chemicals used for cleaning, etc. A properly designed system will provide a comfortable indoor environment year round when properly maintained.
How does my AC work?
An air conditioner cools and dehumidifies the air as is passes over a cold coil surface. The indoor coil is an air-to-liquid heat exchanger with rows of tubes that pass the liquid through the coil. Finned surfaces connected to these tubes increase the overall surface area of the cold surface thereby increasing the heat transfer characteristics between the air passing over the coil and liquid passing through the coil. The type of liquid used depends on the system selected. Direct-expansion (DX) equipment uses refrigerant as the liquid medium. Chilled-water (CW) can also be used as a liquid medium. When the required temperature of a chilled water system is near the freezing point of water, freeze protection is added in the form of glycols or salts. Regardless of the liquid medium used, the liquid is delivered to the cooling coil at a cold temperature.
In the case of direct expansion equipment, the air passing over the indoor cooling coil heats the cold liquid refrigerant. Heating the refrigerant causes boiling and transforms the refrigerant from a cold liquid to a warm gas. This warm gas (or vapor) is pumped from the cooling coil to the compressor through a copper tube (suction line to the compressor) where the warm gas is compressed. In some cases, an accumulator is placed between the cooling coil and the compressor to capture unused liquid refrigerant and ensures that only vapor enters the compressor. The compression process increases the pressure of the refrigerant vapor and significantly increases the temperature of the vapor. The compressor pumps the vapor through another heat exchanger (outdoor condenser) where heat is rejected and the hot gas is condensed to a warm high pressure liquid. This warm high pressure liquid is pumped through a smaller copper tube (liquid line) to a filter (or filter/dryer) and then on to an expansion device where the high pressure liquid is reduced to a cold, low pressure liquid. The cold liquid enters the indoor cooling coil and the process repeats.
As this liquid passes through the indoor cooling coil on the inside of the heat exchanger, two things happen to the air that passes over the coil’s surface on the outside of the heat exchanger. The air’s temperature is lowered (sensible cooling) and moisture in the air is removed (latent cooling) if the indoor air dew point is higher than the temperature of the coil’s surface. The total cooling (capacity) of an AC system is the sum of the sensible and latent cooling. Many factors influence the cooling capacity of a DX air conditioner. Total cooling is inversely proportional to outdoor temperature. As the outdoor temperature increases the total capacity is reduced. Air flow over the indoor cooling coil also affects the coil’s capacity and is directly proportional to the total capacity of an AC system. As air flow increases, the total capacity also increases. At higher air flow rates the latent capacity of the cooling coil is reduced. Indoor temperature and humidity also affect the total capacity of the AC system. As indoor temperatures increase, the sensible capacity also increases.
What type of AC systems are available?
Cooling Only Split-System
A split system is a combination of an indoor air handling unit and an outdoor condensing unit. The indoor air handling unit contains a supply air fan and an air-to-refrigerant heat exchanger (or cooling coil), and the expansion device. The outdoor condensing unit consists of a compressor and a condenser coil. Split-systems are typically found in residential or small commercial buildings. These systems have the highest energy efficiency rating (EER) of all the available AC systems. Manufacturers are required to take the EER rating a step further and provide a seasonal energy efficiency rating (SEER) for use by consumers. SEER ratings vary widely and range from 10 to 20. The higher the SEER rating, the more efficient the AC system operates. If heating is required, an alternate method of heating the interior of the building must be used, usually in the form of electric or gas heating.
Cooling Only Packaged-System
A packaged system is a single unit combining all the components described in the split system. Since the unit is a package, it must be placed outside the building and indoor air is “ducted” from the building to the packaged system and back through an air distribution system. These units typically have SEER rating from 10 to 18. If heating is required, an alternate method of heating the interior of the building must be used, usually in the form of electric or gas heating.
Heat pumps are similar to cooling only systems with one exception. A special valve in the refrigeration piping allow the refrigeration cycle to be operated in reverse. A cooling only system cools the indoor air and rejects heat to the outdoors. A heat pump can also cool the indoor air, but when the valve is reversed, the indoor air is heated. A supplementary electric resistance heater may also be used to assist the heat pump at lower outdoor temperatures. In colder climates, heat pumps require a defrost period. During defrost times the electric heater is the only means of heating the interior of the building. These units are manufactured as either split or packaged systems.
Chilled Water System
In a chilled water system, liquid water is pumped throughout the building to “chilled water coils”. Since the liquid water needs to be at a cold temperature, a “cooling plant” is required. The plant is typically referred to as a chiller plant. Vapor compression equipment in the plant, similar to that described in “How does my AC work”, cool water to a cold temperature and pump the cold water to air-to-water heat exchangers where needed.
Window Air Conditioners
As the name implies, a window air conditioner is typically installed in a window or custom opening in a wall. The Window AC can only cool small areas and are not intended to provide cooling to multiple rooms or zones. These air conditioners are manufactured as cool only or can provide both cooling and heating. An optional damper in the unit can provide fresh outdoor air if necessary.
Packaged Terminal Heat Pump
Packaged terminal heat pumps (PTHP) are are similar to a window-mounted air conditioner. These units are typically installed in a sleeve passing through the outdoor wall of an apartment, hotel, school classroom, etc. PTHPs are completely self contained and require only an electrical connection in addition to the opening in the building shell. They use the outdoor air as the heat source in winter and as a heat sink in summer. They also can provide ventilation air. Flexibility and lower installed cost are the primary advantages of the PTHP. Disadvantages include in-room maintenance, higher operating cost, relatively short life, imprecise “on-off” temperature control, and they can be rather noisy.