Modeling of Novel Thermodynamic Cycles to Produce Power and Cooling Simultaneously

Abstract

Thermodynamic cycles to produce power and cooling simultaneously have been proposed for many years. The Goswami cycle is probably the most known cycle for this purpose; however, its use is still very limited. In the present study, two novel thermodynamic cycles based on the Goswami cycle are presented. The proposed cycles use an additional component to condense a fraction of the working fluid produced in the generator. Three cycles are modeled based on the first and second laws of thermodynamics: Two new cycles and the original Goswami cycle. The results showed that in comparison with the original Goswami cycle, the two proposed models are capable of increasing the cooling effect, but the cycle with flow extraction after the rectifier presented higher irreversibilities decreasing its exergy efficiency. However, the proposed cycle with flow extraction into the turbine was the most efficient, achieving the highest values of the energy utilization factor and the exergy efficiency. It was found that for an intermediate split ratio value of 0.5, the power produced in the turbine with the flow extraction decreased 23% but the cooling power was 6 times higher than that obtained with the Goswami Cycle.

Thermodynamic cycles for the simultaneous production of power and cooling: A comprehensive review

“…Because in some of the proposed systems, the cooling load considerably increased, the EUF was proposed, which considers not only the power produced by the system, but all the energy produced regardless if it was in the form of power or heat. The highest EUF values for a system operating with the NH 3 ‐H 2 O mixture were reported by Rivera et al 35 The EUF of 0.65 was obtained for the system, including an additional condenser to the Goswami cycle and a flow extraction in the turbine, and 0.6 was obtained for the same system but without a flow extraction.…”

“…Other modifications were made to the Goswami cycle, searching not only to improve the system performance but also to improve their versatility to produce more cooling or power according to the industrial process needs. This is the case of the studies carried out by Ventas et al, 33 Shankar and Srinivas, 32 and Rivera et al 35 …”

“…Rivera et al 35 reported two new thermodynamic cycles operating with NH 3 ‐H 2 O for the simultaneous production of power and cooling and compared the results with a conventional Goswami cycle. One of the cycles has a stream division after the rectifier (see Figure 8A), while the second cycle has a vapor extraction in the turbine at an intermediate pressure (see Figure 8B).…”

“…Cycle proposed by Rivera et al 35 : A, with flow division at the exit of the rectifier; B, with flow extraction in the turbine [Colour figure can be viewed at wileyonlinelibrary.com]…”

Absorption Power and Cooling Combined Cycle with an Aqueous Salt Solution as a Working Fluid and a Technically Feasible Configuration

“…This concept with an added condenser was suggested not only for the water-ammonia mixture but also for an LiBr-water solution [57]. The cooling load can be further boosted by adding a flashing tank to the stream of the returning solution, thus routing more vapour to the condenser [58].…”