Modified Models and Database for Calculating Cooling Degree-Days for the Egyptian Climates

Abstract: Degree-days techniques are fundamental steady state methods for cooling frameworks analysis. The significance of such techniques shows up in the most recent couple of decades where vitality consumption increments altogether while the world energy assets turn out to be rare. Additionally, these techniques can provide a straightforward approach for the estimation of monthly or annual energy consumptions of air conditioning systems.
The issue of building up a cooling degree-days unit for summer air conditioning systems similar to that for heating system has been entangled by the way that energy consumption for summer air conditioning systems is influenced not just by sensible heat transmission (because of dry bulb temperature contrast) but additionally by latent heat load. Endeavors, have been done to make sense of a cooling degree-days unit by including the estimations of the inconvenience list (incorporates both dry bulb and wet bulb temperatures with certain weights) at different time periods daily, then subtracting certain value (usually called base temperature) from this sum.
This requires comprehensive temperature records and does not take into account the internal sources of the latent loads (inhabitants, supplies, and so on). Another intricacy is the effect of solar radiation on cooling loads, which is not directly related to any of the ambient temperatures. Besides, many works exhibited comes about for cooling degree-days units utilizing wet bulb temperatures only.
In this work, cooling degree-days models are exhibited and connected to most cities in Egypt covering every climatic zone of the country. The models considers the impact of both the sensible heat transmission and the latent (inward and outside) cooling load. They additionally consider the impact of solar heat gain on the cooling degree-days unit. What's more, the impact of base temperature is examined. Correlations between the consequences of the introduced model and cooling degree-days units computed from direct surrounding temperature records are shown.