UAE Focus

Swairjo ... right size of AC unit is important.

Swairjo ... right size of AC unit is important.

Al Reyadah reveals chilling truths

February 2012

A REGIONAL air-conditioning (AC) expert has urged constructors and real estate developers in the Gulf to correct the sizes of current air-conditioning and set the right sizes for future air-conditioning for the benefit of end-users.

Mohammed Swairjo, general manager of Al Reyadah, a UAE-based specialised AC contracting and management company that serves clients in the Gulf, said: “The Gulf region is one of the largest users of air-conditioning in the world. Over-sizing or under-sizing the power of the AC systems in a building will cause harm to end-users and building owners in the long run. Builders and contractors are usually in charge of selecting the AC type in homes.”

Swairjo added: “Correctly sizing the unit to a building unit should be at the top of the priority list of contractors and real estate developers so as to extend the life of the AC as well as enable customers to enjoy a higher quality service.”

In addition to cooling the treated air with a refrigerant, central AC lowers the relative humidity of the air indoors to between 40 and 60 per cent. This creates a comfortable environment without leading to the damp or clammy conditions created by an oversized AC system, not to mention the higher initial cost of the larger AC compared with the right size one.

Under-sizing the system would be equally bad, as it would take longer to reach the desired temperature and humidity levels, causing the compressor to be constantly running.

AC sizes should be determined based on a proper and scientific method for use by professionals in the trade. Calculations for the appropriate cooling requirements should take into consideration the building’s construction materials, insulation levels, number of windows and sizes of rooms.

An air-conditioner of the correct size will remove humidity effectively as it cools, whereas an oversized unit will turn on and off too frequently, leading to loss of efficiency and the ability to properly dehumidify the home. This may result in higher utility bills and a less comfortable home.

Central AC units are compared by their seasonal energy efficiency ratio (SEER), which is a good indicator of the energy draw of a particular unit – the higher the SEER rating, the better the energy efficiency.

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