Performance assessment of hybrid desiccant cooling system at various climates

Abstract

In our work, operation of hybrid desiccant cooling system (HDCS) has been investigated based on experimental studies. Different climates have been created by changing the temperature and humidity of HDCS inlet air, using an electrical heater and a centrifuge humidifier. Input energies, temperature of various points, and their relative humidity have been measured at the created climates. Coefficient of performance (COP), thermal coefficient of performance, and electrical coefficient of performance (ECOP) of the HDCS have been calculated. As a reference situation, vapor compression system (VCS) was examined at the same condition as HDCS. Results show that COP of HDCS in comparison with VCS decreased about 36% and 28% in hot-dry and hot-humid climates, respectively, which is due to the thermal energy consumption in HDCS. In contrast its ECOP increased, which means that by using HDCS some electrical energy would be saved. Defining operating cost index (OCI) parameter, operation costs of VCS and HDCS have been compared. Analyzing the OCI results shows that in HDCS, although decreasing the electricity consumption results in more usage of natural gas, these systems are economical especially in those countries with low natural gas prices.

Optimization of a rotary desiccant wheel for enthalpy recovery of air-conditioning in a humid hospitality environment

“…Experimental investigation of a designed desiccant cooling system found its COP to vary from 0.4 to 4.0 during the day, with a mean value of 1.35 ( Hurdogan et al., 2010 ). Compared with a vapor compression system, experimental findings for various climates found the overall desiccant cooling COP to decrease about 36% in a hot-dry climate and 28% in a hot-humid climate ( Mandegari and Pahlavanzadeh, 2010 ).…”

Performance studies of hybrid solid desiccant–vapor compression air-conditioning system for hot and humid climates

“…Experimental investigation of solar assisted hybrid desiccant cooling system for hot and humid weather of Malaysia was also conducted [8]. Solid desiccant based hybrid air-conditioning systems can give substantial energy savings as compared to conventional vapor compression refrigeration based air-conditioning systems in hot and humid climatic conditions [9].…”

Effects of different air inlet temperatures and regeneration air inlet velocities on the performance of Hybrid Desiccant Air Conditioning System

“…The correspondent electricity saving was around 19%. Mandegari and Pahlavanzadeh (2010) [5] examined a desiccant wheel incorporating a vapour compression refrigeration system at different supplied-air humidities and temperatures. They had compared the performance of a desiccant air conditioning system to that of a conventional vapour compression refrigeration system on an experimental basis.…”