Abstract
For an absorption cycle, a ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O was proposed as a new working pair to replace LiBr/H2O. The thermodynamic properties including specific heat capacity, specific enthalpy, density, and viscosity were systematically measured and fitted by the least-squares method. The thermodynamic performance of a double-effect absorption refrigeration cycle based on LiBr–[BMIM]Cl(2.5:1)/H2O was investigated under different refrigeration temperatures from 5 °C to 12 °C. Results showed that the ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O had advantages in the operating temperature range and corrosivity. Compared with LiBr/H2O, the operating temperature range was 20 °C larger, and the corrosion rates of carbon steel and copper were reduced by more than 50% at 453.15 K. However, the double-effect absorption refrigeration cycle with LiBr–[BMIM]Cl(2.5:1)/H2O achieved a coefficient of performance (COPc) from 1.09 to 1.46 and an exergetic coefficient of performance (ECOPc) from 0.244 to 0.238, which were smaller than those based on LiBr/H2O due to the higher generation temperature and larger flow ratio.
Highlights
An absorption heat pump (AHP), which can be driven by renewable energy or industrial waste heat for cooling or heating, is proven to have a great energy-saving potential in buildings.From the utilization of a driving heat source, the AHP cycle is divided into single-effect, double-effect, and multiple-effect AHP
The double-effect AHP has two generators, where the temperature of the driven heat source for the first generator is obviously higher than single-effect, and the vapor which is generated from the first generator is the heat source of the second generator
The coefficient of performance (COP) of double-effect or multi-effect AHP is higher than single-effect AHP because the system can generate more vapor refrigerant per unit heat supplied
Summary
An absorption heat pump (AHP), which can be driven by renewable energy or industrial waste heat for cooling or heating, is proven to have a great energy-saving potential in buildings. A quaternary working fluid LiNO3 –KNO3 –NaNO3 /H2 O was compatible with austenitic stainless-steel materials at high temperature up to approximately 260 ◦ C, but the solubility of this working fluid was too low [19] Organic fluid mixtures, such as trifluoroethanol (TFE)–tetraethylenglycol dimethylether (TEGDME), methanol–TEGDME, TFE–N-methy1-2-pyrrolidone (NMP), and TFE–2-pyrrolidone (PYR), were investigated as new working fluids by several researchers [20,21]. The crystallization temperature, saturated vapor pressure, and corrosivity of this working pair were studied, and the results showed that its crystallization temperature and corrosivity were both lower than the common working pair LiBr/H2 O To further evaluate this alternative working pair, some other important thermodynamic properties including density, viscosity, specific heat capacity, and specific enthalpy were systematically measured, and the performance of a double-effect absorption refrigeration cycle based on LiBr–[BMIM]Cl(2.5:1)/H2 O was investigated and compared with that using LiBr/H2 O
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