With the phase-out of HCFCs, and R-22 in particular, there is concern over the choice of alternatives for AC in countries with hot climates. At the upcoming UNIDO ATMOsphere conference (June 3-4 Vienna) this topic will be analysed in a Case Study by Godrej India/GIZ Proklima. Other examples of hydrocarbons in high ambient temperatures will be discussed including a presentation showcasing a medical store room with a 24 kilo refrigerant charge in Costa Rica, cold store facilities in Viet Nam, and a UNEP/UNIDO program promoting low-GWP alternatives. Registration (free of charge) is still open!
This presentation addresses the performance of an R-22 split type air conditioner and an R-290 air conditioner specifically for very high ambient temperatures. The result of the equipment tested will be analysed in terms of capacity and coefficient of performance (COP). Further modeling exercises indicate that adjustments in terms of the characteristics of the evaporator and condenser can help improve the performance at high ambient temperatures. However, R-290 is a flammable refrigerant, meaning that safety considerations must be given to its use. Given that high ambient temperatures imply larger heat loads and therefore greater cooling capacity and refrigerant charges, additional deliberations are necessary to address the constraints and associated risks.
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