Installing a portable air conditioner

Get the sizing wrong, and you’ll be facing problems such as insufficient cooling, insufficient moisture removal, and unnecessarily high electricity bills. It is a mistake, you can’t afford to make. It may happen through conduction, convection or radiation, or any combination between these three. Hence, heat transfer between installing a portable air conditioner and inside of your dwelling space is inevitable.

Air conditioning units are designed to control heat gain or loss within conditioned air. Is defined as the heat of dry air. 0 Kelvin, be it from electrical appliances, lighting and sun’s radiation. This is the horizontal component of temperature rise, as illustrated in the psychrometric chart. Is the heat contained in the water vapour, carried by the air.

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The higher the water vapour content, the higher the latent heat. Examples are, your perspiration, cooking by steam, or hot water vapour from the bathroom. Air conditioner sizing has to be carried out such that, sensible heat gain or loss in your space, is balanced by the sensible and latent heat removal or addition to your space. All three methods have been used by air conditioner contractors throughout the world, in near-equal distribution. Let us look at these in detail.

Radiation heat gain is proportional to the surface emissivity, ε. Furthermore, the numbers I have stated, vary from a contractor to another. You can, however use the numbers for purchasing or renting smaller units, and in small quantities, say, portable, window, or small ductless air conditioners, where the stake is generally less than USD 2,000. It is the accepted method for calculating heating or cooling load for residential and industrial application.

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