Analytical Study of a Heat Recovery/Desiccant Cooling System under Tunisian Climatic Conditions

Abstract

Abstract-The solar potential energy in Tunisia can be used like a principal factor for the operation of new technologies of air conditioning. Studies could be carried out like approaches of simulation, analyzes experimental or both unit. In this paper, we present an analytical solution of heat and mass transfer processes in regenerator and air conditioning system (ACS) cores of a heat recovery /desiccant cooling system (HRDCS) under Tunisia weather conditions. Simulations programs were carried out to test the principal components of the HRDC system. The results show that the coefficient of performance of system improves when we use the renewable energy for heating and cooling. This study is significant and effective to prove the efficiency of such HRDC systems in this country.

Variable Capacity Absorption Cooling System Performance for Building Application

“…The strong solution enters the generator (1) where ammonia is raised in to vapors by external heat supply and is separated from the solution. The ammonia vapor exits the generator (2) and weak solution returns to absorber through the solution heat exchanger (3)(4)(5)(6)(7)(8)(9) and lowers its pressure through pressure reducing valve (9)(10). The ammonia vapors are condensed in the condenser and latent heat of condensation is released in to the cooling water flowing through the condenser.…”

“…At this low pressure saturated liquid ammonia enters the evaporator and is again converted to vapors by absorbing the latent heat from the chilled water circulated between evaporator and cooling space. The refrigerant vapor produced enters the absorber (6) and absorbed by strong solution in the absorber where the heat of absorption is released to the surrounding fluid (water or air) and strong solution released through the absorber either in saturated or in a slightly sub-cooled state. This process is continued and the refrigerating effect is produced.…”

“…A global increase in the population has led to the massive constructions, further leading to increase in the cooling demand thus increasing the installation of large number of refrigeration systems, requiring energy for their operations. Also, during the past years, the amount of time spent indoor (inside the building, either home or office) has also increased considerably, leading to the requirement of establishing and ensuring proper thermal comfort and thus making them the largest consumer of energy [4][5][6]. Only conventional means of energy cannot suffice the demand thus generated, as being a developing nation industrial sector can also not be neglected.…”

Solar Air-Conditioning Systems

“…In fact, they can decrease the greenhouse gas emissions and improve the energy savings given that they do not use any ozone-depleting refrigerants and consume less energy as compared with the vapor compression systems [34][35][36]. Their benefits are meaningful when they interact with renewable energy technologies, such as solar collectors [37,38]. They also reduce moisture from the indoor air and enhance its quality [39][40][41].…”