Abstract
This work aims to transient performance of chiller single effect absorption refrigeration using the LiBr/H2O pair with nominal capacity of 35 kW. The goal of this study is to verify the absorption chiller when subjected to thermal loads and it transiently responsive as a function of the temperatures of the chilled, hot and cold water of the system. An experimental methodology was established in a micro-CHP laboratory to simulate the dynamic operating conditions of the system considering the thermal load (chilled water), the activation source (hot water) and the heat dissipation circuit (cold water). The thermal load was simulated from a set of electrical resistors installed in a water heater and the activation of the chiller from recovery gas a microturbine 30 kW and through a compact heat exchanger, where water is heated and stored in a hot buffer tank. The absorption chiller heat dissipation system consists of the pump and cooling tower. The system responded appropriately to the thermal load imposed providing COP values in the transient regime of 0.55 to 0.70 the temperature conditions tested.
Highlights
Absorption systems represent an energy and economical alternative which set out to replace mechanical compression systems in the area of refrigeration and air conditioning
An absorption system has a lower coefficient of performance (COP) when compared to a mechanical compression system, it presents a great advantage since it can be driven by thermal rejects
Absorption refrigeration systems have been studied by using analysis of the 1st and 2nd Law of Thermodynamics, considering conditions of permanent regime (Somers et al, 2011; Ochoa et al, 2014) and a transient regime (Zinet, Rulliere, & Haberschill, 2012; Evola, Le Pierrès, Boudehenn, & Papillon, 2013; Ochoa, Dutra, Henríquez, & Santos, 2016), the purpose of which is to verify the influence of technical parameters such as; temperature, pressure and flow on the COP of the system
Summary
Absorption systems represent an energy and economical alternative which set out to replace mechanical compression systems in the area of refrigeration and air conditioning. Absorption refrigeration systems have been studied by using analysis of the 1st and 2nd Law of Thermodynamics, considering conditions of permanent regime (Somers et al, 2011; Ochoa et al, 2014) and a transient regime (Zinet, Rulliere, & Haberschill, 2012; Evola, Le Pierrès, Boudehenn, & Papillon, 2013; Ochoa, Dutra, Henríquez, & Santos, 2016), the purpose of which is to verify the influence of technical parameters such as; temperature, pressure and flow on the COP of the system Another way of analyzing absorption refrigeration systems, under steady state conditions, is to apply the characteristic equation method, which was developed from approximating the behavior of items of absorption refrigeration equipment by making multilinear adjustments and regressions using experimental data and/or the manufacturer’s specifications (Puig, López, Bruno, & Coronas, 2010; Gutiérrez-Urueta, Rodríguez, Ziegler, Lecuona, & Rodríguez-Hidalgo, 2012). The importance of experimental data that allow the real behavior of absorption systems to be verified, as well as of obtaining databases that allow curves and functions of comparison to be adjusted is great, as these data can be applied when validating numerical models (Marc, Sinama, Praene, Lucas, & Castaing-Lasvinottes, 2015), designing control strategies (Seo, Shin, & Chung, 2012), taking advantage of the uses of solar energy as a driven source (Tsoutsos, Aloumpi, Gkouskos, & Karagiorgas, 2010; Venegas et al 2011; Olivier, Praene, Bastide, & Franck, 2011; Edem, Le Pierrès, & Luo, 2012) and for cogeneration system applications (Popli, Rodgers, & Eveloy, 2013; Ochoa et al 2014)
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