Abstract
Adsorption cooling is a promising technology to recover low-temperature waste heat from a diesel genset. In this paper, an advanced adsorption chiller working in variable mode is proposed for the combined cooling and power cycle (CCP) to recover waste heat from the water jacket in the diesel genset. The chiller works on three modes based on the ambient temperature for better heat utilization. In this study, three modes were investigated: single-stage cycle mode, short-duration, and medium-duration mass recovery modes. The results show that the energy and exergy efficiency for a single-stage cycle mode is higher at an ambient temperature lower than 35 °C . In comparison, the mass recovery mode has a higher energy and exergy efficiency at an ambient temperature higher than 35 °C. The annual energy and exergy efficiency for the CCP was investigated when the chiller works with variable modes based on the ambient temperature under DUBAI weather conditions as a case study. The results show an improvement of 14.7% and 14% of the energy and exergy efficiency, respectively, for CCP with a variable mode adsorption chiller compared to diesel genset alone. The results also show the CCP with variable mode adsorption chiller has a slight improvement on both energy and exergy efficiency compared to CCP with a single-stage adsorption chiller at the same ambient conditions.
Highlights
Cooling application is one of the highest consumers of the primary energy in United Arab Emirate [1]
The energy and exergy efficiency of combined coolingpower (CCP) with adsorption chiller was analyzed on an hourly basis based on DUBAI weather conditions obtained from a Typical Meteorological Year (TMY)
This study investigated a CCP system with an adsorption chiller for four operation scenarios for the proposed chiller; single-stage mode, short mass recovery mode, medium mass recovery mode, and variable mode
Summary
Cooling application is one of the highest consumers of the primary energy in United Arab Emirate [1]. The cooling application is one of the highest energy consumers in UAE This makes the combined coolingpower (CCP) an interesting option for energy saving and reducing Greenhouse Gases (GHG) emissions by utilizing waste heat at low-temperature levels from the diesel genset to drive thermal cooling technologies, as absorption and adsorption cooling. The simple single-stage cycle has better performance at low re-cooling and ambient temperatures for air-cooled application, while the mass recovery cycle with heating and cooling has better performance at higher re-cooling and ambient temperatures [20] It is clear from the previous literature that, using and recovering waste heat from power generation systems, diesel engines, and power plants improves the total system efficiency. This study aims to investigate the energy and exergy performance of a CCP system using a variablemode adsorption chiller under various ambient temperatures
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