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Research Papers: Energy Systems Analysis

A Novel Design of Triple-Hybrid Absorption Radiant Building Cooling System With Desiccant Dehumidification

[+] Author and Article Information
Gaurav Singh

Indian Institute of Technology Ropar,
Rupnagar, Punjab 140001, India
e-mail: gaurav.singh@iitrpr.ac.in

Ranjan Das

Mem. ASME
Indian Institute of Technology Ropar,
Rupnagar, Punjab 140001, India
e-mail: ranjandas81@gmail.com

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 18, 2018; final manuscript received December 8, 2018; published online January 9, 2019. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(7), 072002 (Jan 09, 2019) (13 pages) Paper No: JERT-18-1791; doi: 10.1115/1.4042239 History: Received October 18, 2018; Revised December 08, 2018

In air-conditioning, strategy of decoupling cooling and ventilation tasks has stimulated considerable interest in radiant cooling systems with dedicated outdoor air system (DOAS). In view of this, current paper presents a simulation study to describe energy saving potential of a solar, biogas, and electric heater powered hybrid vapor absorption chiller (VAC) based radiant cooling system with desiccant-coupled DOAS. A medium office building under warm and humid climatic condition is considered. To investigate the system under different operational strategies, energyplus simulations are done. In this study, a novel design involving solar collectors and biogas fired boiler is proposed for VAC and desiccant regeneration. Three systems are compared in terms of total electric energy consumption: conventional vapor compression chiller (VCC) based radiant cooling system with conventional VCC-DOAS, hybrid VAC-based radiant cooling system with conventional VCC-DOAS, and hybrid VAC-based radiant cooling system with desiccant-assisted VCC-DOAS. The hybrid VAC radiant cooling system and desiccant-assisted VCC-DOAS yields in 9.1% lesser energy consumption than that of the VAC radiant cooling system with conventional VCC-DOAS. Results also show that up to 13.2% energy savings can be ensured through triple-hybrid VAC radiant cooling system and desiccant-assisted VCC-DOAS as compared to that of the conventional VCC-based radiant system. The return on investment is observed to be 14.59 yr for the proposed system.

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Figures

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Fig. 1

3D building geometry with internal cross section

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Fig. 2

System layout for case 1

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Fig. 3

System layout for case 2

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Fig. 4

System layout for case 3

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Fig. 5

(a) Comparison of annual electric energy consumption in all three cases and (b) cooling load supplied by the chillers in different cases

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Fig. 6

Solar fraction for different cases

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Fig. 7

Partitioned heating energy provided by water heating system in (a) loop 1 and (b) loop 2

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Fig. 8

Site outdoor available solar radiation throughout the year

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Fig. 9

(a) Variation in the generator temperatures and (b) variation in water tank and regeneration coil outlet temperatures

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Fig. 10

Hourly variation in flow rate through (a) radiant chiller and DOAS chiller evaporator and (b) regeneration coil and absorption chiller generator

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Fig. 11

Hourly variation of COP: (a) case 1, (b) cases 2 and 3, (c) case 2, and (d) case 3

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