Abstract
The ROBUR ® absorption refrigeration system (ARS), model ACF60, with a capacity of 17.5 kW, is tested, modeled and simulated in the steady state. To simulate the thermal load a heating system with secondary coolant was used, in which a programmable logic controller (PLC) kept the inlet temperature EVA at around 285.15 K. The mathematical model used was based on balancing the mass, energy and ammonia concentrations and completed by closing equations such as, Newton's cooling equation. The mathematical model was implemented using the Engineering Equation Solver – EES ® . The results obtained after modeling and a numerical permanent simulation are studied using the Duhring diagram. Potential points of internal heat recovery are visualized, and by using graphs of the binary mixture, it is possible to identify the thermodynamic states of all monitored points. The data obtained in the numerical simulation of the ARS was compared with data acquired in the actual tests of the ARS with the ROBUR ® apparatus.
Highlights
One of the major problems in the refrigeration field is how best to control air conditions or processes by controlling the temperature and humidity in order to achieve optimum comfort conditions or processes
The absorption refrigeration system (ARS) has three levels of pressure: the highest level contemplates the following components: GERA, RET, coil of the rectifier (CRET), coil of the absorber (CABS) and COND; the intermediate level, where the liquid flows in the heat exchanger (HEC), in the annular space; and the lower level, where one finds the EVA, steam flowing in the HEC along its tube side, the ABS and the air heat exchanger (AHEA)
This occurs in the following components: the top of GERA, RET, COND, RV1, HEC, EVA and ABS; the third is the flow of water which will be refrigerated in the EVA, i.e., the secondary fluid of refrigeration
Summary
One of the major problems in the refrigeration field is how best to control air conditions or processes by controlling the temperature and humidity in order to achieve optimum comfort conditions or processes. Cooling equipment is used to achieve comfort temperatures in air conditioning applications, or operating temperatures in manufacturing processes. These items of equipment are available in various technologies, vapor compression being the one that is most used in. Technology refrigeration systems, and for which electric energy drives the mechanical compressor. A technology that has already been much used is the Absorption Refrigeration System (ARS), where heat is the energy source (Kohlenbach & Ziegler, 2008a, 2008b, Rodriguez-Muñoz & Belman-Flores, 2014). The interest in using the ARS is related to shortages of electric energy. If the cost of producing this energy increases, ARSs would be manufactured, and, otherwise, if the cost decreases, the interest in manufacturing these systems decreases
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