Figure 11 Required reduction of VCAS cooling capacity in all three modes
Figure 11 describes the required reduction in the cooling capacity of a
vapor compression air conditioner when it is operated in mode 1, mode 2,
and mode 3. In mode 1 when the supply air condition is given as 27.5°C
and 60% Relative Humidity, the phenomenal reduction in the average
cooling capacities of vapor compression air conditioners are 73%, 70%,
and 68% respectively at the ambient humidity ratios of 21,22 and 28
gkg-1d.a. At mode 2 when the supply of air
conditioning is set as 22.5°C and 75% Relative Humidity, the
significant reduction in the average cooling capacities of vapor
compression air conditioners are 57%, 56.5%, and 57.5% respectively
at the same ambient humidity ratios tested for mode 1.
Similarly in mode 3, when the supply air condition is 22°C and 50%
Relative Humidity, the substantial reduction in the average cooling
capacities for the vapor compression air conditioners are 34%, 35%,
and 41% respectively. This is for the same ambient humidity ratios
tested for mode 1 and mode 2.
Though the supply air conditioning for mode 1 and mode 2 are not exactly
in the comfort zone, the cooling provided in mode 1 and mode 2 is
significant and the supply air conditioning is only marginally away from
the comfort zone. Therefore, the solid desiccant-vapor compression air
conditioner hybrid cooling system delivers an average reduction in
cooling capacities of 70.5% and 57% in mode 1 and mode 2 respectively.
This demonstrates the energy-efficient working of the HSDVC in hot-humid
climates. The supply of air conditioning in mode 3 is exactly in the
comfort zone. In mode 3, the hybrid cooling system gives an average
reduction in the cooling capacity of the vapor compression air
conditioner by 37%. From the results of the study of the hybrid cooling
system, it is found that the hybrid cooling system could significantly
induce a reduction in the cooling capacity of the vapor compression air
conditioner from 37% to 71%.
Conclusion
A single-stage solid desiccant cooling system is simulated by using a
BLUEJ programming framework. The system is tested for numerous hot-humid
ambient conditions. The results of the simulation of the solid desiccant
cooling system are given as an input entry air condition for the vapor
compression air conditioning system. The system is made to work in three
modes namely 1, 2, and 3. The results of the study reveal that the
system could potentially provide a reduction in the cooling capacity of
the vapor compression air conditioner under the operations of mode 1,
mode 2, and mode 3. The average reduction in the cooling capacity of the
vapor compression air conditioner for the three modes is 71%, 57%, and
37% respectively. The solid desiccant cooling system could potentially
serve as a pre-cooler to work along with the air conditioning unit in a
hybrid cooling mode. Due to the substantial cooling capacity reductions
demonstrated by the hybrid cooling system, the solid desiccant cooling
system could be used as a pre-cooler coupled with an air conditioning
system leading the path to energy efficiency
Declaration of Conflicting Interests
The author(s) declared no potential conflicts of interest concerning the
research, authorship, and/or publication of this article.
Acknowledgment
This project is carried out by the funding provided by DST-SERI, India,
and the file no is DST/ TM/SERI/2k12/81(G). The authors thank the
funding agency, which helped to establish the “Centre For Alternate
Cooling” at PSG College of Technology, where this work is being carried
out. The authors also acknowledge the funding provided by the industry
partner, Trident Pneumatics Pvt Ltd, Coimbatore, India for their support
rendered in the co-sponsoring and the guidance for the project.
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