Simulation of a solar driven aqua-ammonia absorption refrigeration system Part 2: viability for milk cooling at remote Brazilian dairy farms

Analytical modelling of food storage cooling with solar ammonia-water absorption system, powered by parabolic trough collectors. Method

“…A mathematical model of a solar NH 3— H 2 O absorption system is provided in [2] and was applied to milk cooling applications in [3] . Thermal performances of a NH 3— H 2 O refrigeration system are investigated in [18] while optimizations of such systems are proposed in [4] .…”

The Aqua-Ammonia Absorption System: An Alternative Option for Food Refrigeration

“…Simulation of an aqua-ammonia system is important for optimizing the system design and an efficient absorption system will enhance the opportunity for its application in the food industry. Early simulation work can be traced back to 1970s (Stoecker 1975), since then, various simulation studies have been carried out (Kaushik and Sheridan 1981;Alvares and Trepp 1987;Bulgan 1995). In these simulations, similar thermodynamic analyses were used and therefore, the accuracy of the simulation results mainly depended on the H,O-NH, thermodynamic data used which were published more than ten years ago (Jain and Gable 1971;Shulz 1971;Ziegler and Trepp 1984).…”

State of the Art of Solar Absorption Cooling Technologies

“…Therefore dynamic simulation has been an indispensable part of many research works where various solar thermal systems were evaluated. The literature survey of Zhuo [37] on the previous works on dynamic modeling of absorption systems revealed that early works were focused on the performance of whole solar cooling systems using quasi-steady state models (Stuart and Sheridan, [38]; Anand et al, [39]; McLinden and Klein, [24]; Kaushik et al, [40]; Alvares and Trepp, [41]). In these works, only storage tanks were modeled with differential equations and other components were modeled with steady state equations, which was typically the adopted approach in TRNSYS.…”

“…According to Jakob et al [22], recent development activities on solar DAR (Diffusion Absorption Refrigerator) in Europe cover cooling capacities between 16 W and 2.5 kW and cycle COPs between 0.2 and 0.5. For development of continuous solar-driven refrigerators or heat pumps, single-effect ammonia machines have been the most frequently considered (Shiran et al, [23]; McLinden and Klein, [24]; Alvares and Trepp, [25]; Best, [26]; ARTISC, [27]). Ammonia absorption refrigeration system had been demonstrated at a winery in Graz, Austria (SACE Evaluation report, [28]).…”