Only an ill maintained air conditioning system can make you ill. A well maintained air conditioning system can only contribute to a healthier environment.
Because it controls humidity levels the growth of dust mites and moulds is reduced. Air conditioning maintains humidity levels of 40 - 60% which is positive for persons with allergies.
Air conditioning may have integrated ventilation. Mechanical ventilation is getting more and more important because of the way houses are built these days. The supply of fresh air will prevent the sick building syndrome.
All units are equipped with a filter. Depending on the type of system and the needs of the customer, the type of filter will vary. The effectiveness of a filter goes from catching dust and particles over fine dust and pollen, bacteria, viruses and odours and even microbes and smoke.
It is essential to replace the filters on a fixed period. When you replace the filters too late you risk that the oversaturated filters start distributing bacteria instead of catching them.
When the equipment is correctly selected there will be no draught. This is the job of specialists and should be calculated by an installer. A system with too low capacity will not be able to reach the desired temperature. A system with too high capacity will lead to draught and fluctuating temperatures.
Air conditioning is the ability to simultaneously and effectively control the temperature, humidity, air movement and the quality of the air in a given space.
Heat naturally flows from a warm to a cold substance, so air can therefore be moved over a warm or cold surface for a desired effect. . This warm or cold surface can be obtained only through a process called ‘The Refrigeration Cycle’. This refrigeration process provides cooling below ambient temperature by transferring heat from one area (where it is not wanted) to another area (where it is not objectionable).
Window / Wall Type: This system is designed to fit through a hole in the wall or in a window frame. It is also known as a ‘self-contained’ air conditioner as the ‘indoor’ (evaporator) and ‘outdoor’ (condenser) parts are encased in a single housing. It is necessary to install this all-in-one air conditioner on an external wall/ window in order for the heat to be disposed of via the back of the unit (condenser section.)
Split type: This type comprises an indoor unit (Fan Coil Unit / Evaporator) and an outdoor unit (Condenser Unit). There are a number of indoor split type air conditioners i.e.
- Wall Mounted (mid wall split)
- Ceiling Mounted (cassette split)
- Ducted Type
A typical air conditioning unit has four main components for the cooling cycle:
Evaporator - The liquid refrigerant comes into contact with warm air causing it to evaporate. When refrigerant evaporates, it absorbs heat from the surrounding air. The warm air is drawn in by a fan and sent back into the room.
Compressor - Here the vapour refrigerant (from evaporator) is ?compressed? to a high pressure so that it can be liquefied more readily (by condenser) to repeat the cooling process. The compressor also assists with the circulation of the refrigerant.
Condenser - The high-pressure vapour refrigerant ( still at a high-pressure) is relieved of its high temperature by being cooled by outdoor air (approx. 30-35 degrees Celsius) and liquefied.
Capillary Tube - Here the pressure of the refrigerant (still at a high-pressure is lowered by being forced through a narrow tube (capillary tube) causing energy loss and thus resulting in a pressure drop the sudden lowering of pressure causes the temperature to lower further. Thus as the liquid refrigerant flows through the capillary tube its pressure and temperature is lowered to create a volatile state.
Remember, all the air in a given space needs to pass through the refrigeration cycle (air conditioner) for there to be ‘effective control’ of that area. Therefore, air conditioning can only be effective if the area to be cooled or heated is a sealed environment. For additional heat loads to BTU, the following calculation/s could be used:
- People - Add 400-600 BTU / person (average) depending on activity
- Electrical Equipment – Wattage x 3.4 = BTU (e.g. a 100W light = 100 x 3.4 = 340 BTU)
Window / Wall unit – Self-Contained
A basic entry level air conditioner. This all-in-one unit is ideal for ‘smaller’ spaces such as offices or homes with an area not exceeding 48m². Simple and cost effective to install.
Split Type Unit – Mid wall
This air-conditioner is purpose designed for most offices or homes with an area not exceeding 60m² and has more features than the Window / Wall unit. (Quieter but more costly)
Split Type Unit – Ducted
This air-conditioner has one indoor unit mounted in the ceiling, cooling one or more areas via ducts to a grille exposed on the ceiling or wall. A cost effective method for many areas.
Split Type Unit – Cassette
This air-conditioner has one indoor unit mounted in the ceiling with an exposed grille on the ceiling. An ideal solution for shops or large open plan areas.
Air conditioners are technically complex products that require regular maintenance. Failure to heed these requirements could result in reduction of product life span as well as breakdowns of expensive parts.
Recommendations on maintenance include:
- When choosing a position for an air-conditioner, bear in mind the need for easy access in order to carry out maintenance work.
- If an unusual decrease in cooling/heating capacity occurs, turn off the air conditioner and contact your nearest authorised dealer: this will avoid expensive repairs.
- Air-conditioners are designed to function when outside temperatures are above zero. Serious damage can occur to the unit if operated at outside temperatures that are below zero.
- Ensure cleanliness of indoor and outdoor units.
- Contact an authorised dealer at least every six months to carry out as required maintenance.
- The installation and/or maintenance work should be performed by an authorised dealer and/or installer. If the installation and/or maintenance work is performed by unauthorised dealers or installers, the manufacturer will not be held liable for any damage or incorrect installation.
The owner is liable for any cost incurred for the installation and maintenance of the air conditioner, as the product warranty does not cover any of these costs.
The difference between an inverter and non inverter is the inverter units can alter their speed in response to cooling demand. Some units have an initial over-speed period where they will run at a slightly higher capacity for a set time to pull down the temperature of a hot room. When they reach the set point temperature they can reduce capacity to maintain that level without cycling as much as a normal unit would. This saves power although it’s arbitrary as it would still take a while to recoup the increased purchase costs.
The inverter unit increases the power usage slightly as it converts the incoming power into a suitable style for the air conditioner although the ability to run at a reduced power level helps to drop the overall usage to below that of a typical non-inverter unit. Most of the advertising claiming 30% lower bills using inverters are based on very carefully set up laboratory scenarios. In reality, while they may cost less to run than a conventional unit, buying an efficient conventional unit will still be cost effective.