Abstract
Electric vapor compression systems have been used for heating, ventilation, and air conditioning (HVAC) in many facilities including commercial, residential, and industrial buildings for comfort. However, these systems contribute the largest share of energy consumption in buildings, leading to additional burden in the generation and distribution lines of electric systems especially during the peak load period in the summer of hot climate regions. One alternative for air conditioning is the use of absorption chillers which are driven primarily by thermal energy that can be access from various sources such as solar, biomass, waste heat, and geothermal heat. Single-effect H2O-LiBr absorption chillers have been commercialized and manufactured by several industries many years back. Recently, there is rapid deployment trend of renewable energy such as solar to power the absorption chillers in many facilities for energy saving. Since absorption chillers are designed to be driven by hot water or steam, deployment of solar thermal collectors as the primary thermal energy input necessitates proper configuration strategies and optimization. This involves selection of appropriate size (area) and type of the solar collector unit for a given chiller capacity or cooling requirement. In this regard, this paper presents an optimization of a 35.2 kW Yazaki WFC-SC10 single-effect H2O-LiBr absorption chiller driven by evacuated tube solar collector. The optimization aimed at finding the optimum size of the evacuated tube solar collector according to the chiller nominal capacity at maximum coefficient of performance (COP), which represents the measure of performance of cooling systems from energy point of view. Using the operational parameters and the range of operating conditions of the Yazaki WFC-SC10 chiller, the COP of the chiller is optimized, taking into account the internal operating parameters of the chiller such as temperatures and mass fraction of LiBr or solution concentration. These parameters are associated with solution crystallization, which is detrimental to the operation and reliability of H2O-LiBr absorption machine. The results indicate specific collector area of about 2.2 m2/kW of cooling for the optimum COP. Sensitivity analysis shows that there is risk of solution crystallization by integrating solar collector field larger than 117 m2 in places where solar radiation is up to 1000 W/m2 based on the considered chiller.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Abbreviations
- a1:
-
First-order heat loss coefficient W/m2-K
- a2:
-
Second-order heat loss coefficient W/m2-K2
- A:
-
Area (m2)
- COP:
-
Coefficient of performance
- Cp:
-
Specific heat capacity (J/kg-K)
- h:
-
Enthalpy (J/kg)
- IG:
-
Incident solar flux (W/m2)
- ṁ:
-
Mass flow rate (kg/s)
- P:
-
Pressure (kPa)
- \( \dot{\mathrm{Q}} \) :
-
Heat transfer rate (W)
- T:
-
Temperature (°C or K)
- UA:
-
Overall heat transfer coefficient, (W/K or kW/K)
- \( {\dot{\mathrm{W}}}_{\mathrm{p}} \) :
-
Pump work (W)
- X:
-
Mass fraction of LiBr in solution
- η:
-
Efficiency
- a:
-
Absorber, air
- c:
-
Collector, condenser
- e:
-
Evaporator
- g:
-
Generator
- p:
-
Pump
- sys:
-
System
- u:
-
Useful
- w:
-
Water
References
Prasartkaew B, Kumar S (2014) Design of a renewable energy based air-conditioning system. Energ Buildings 68:156–164
Bellos E, Tzivanidis C (2018) Performance analysis and optimization of an absorption chiller driven by nano fluid based solar flat plate collector. J Clean Prod 174:256–272
Hepbasli A, Alsuhaibani Z (2011) A key review on present status and future directions of solar energy studies and applications in Saudi Arabia. Renew Sust Energ Rev 15:5021–5050
González-Gil A, Izquierdo M, Marcos JD, Palacios E (2011) Experimental evaluation of a direct air-cooled lithium bromide–water absorption prototype for solar air conditioning. Appl Therm Eng 31:3358–3368
Ibrahim NI, Al-Sulaiman FA, Ani FN (2018) Solar absorption systems with integrated absorption energy storage-A review. Renew Sust Energ Rev 82:1602–1610
Montagnino FM (2017) Solar cooling technologies. Design, application and performance of existing projects. Sol Energy 154:144–157
Shirazi A, Taylor RA, Morrison GL, White SD (2018) Solar-powered absorption chillers: a comprehensive and critical review. Energy Convers Manag 171:59–81
Eicker U, Pietruschka D (2009) Optimization and economics of solar cooling systems. Adv Build Energy Res 3:45–81 7
Assilzadeh F, Kalogirou SA, Ali Y, Sopian K (2005) Simulation and optimization of a LiBr solar absorption cooling system with evacuated tube collectors. Renew Energy 30:1143–1159
Mazloumi M, Naghashzadegan M, Javaherdeh K (2008) Simulation of solar lithium bromide-water absorption cooling system with parabolic trough collector. Energy Convers Manag 49:2820–2832
Saleh A, Mosa M (2014) Optimization study of a single-effect water–lithium bromide absorption refrigeration system powered by flat-plate collector in hot regions. Energy Convers Manag 87:29–36
Kumar V, Pandya B, Patel J, Matawala V (2018) Vapor absorption system powered by different solar collectors types: cooling performance, optimization, and economic comparison. Sci Technol Built Environ 4731:1–14
Pandya B, Kumar V, Patel J, Matawala VK (2018) Optimum heat source temperature and performance comparison of LiCl–H2O and LiBr–H2O type solar cooling system. J Energy Resour Technol 140:051204
Ibrahim NI, Al-sulaiman FA, Saidur R (2016) Performance assessment of water production from solar cooling system in humid climate. Energy Convers Manag 127:647–655
Duffie JA, Beckman WA (2013) Solar engineering of thermal processes, 4th edn. John Wiley & Sons, Hoboken, NJ
Mohan G, Uday Kumar NT, Pokhrel MK, Martin A (2016) Experimental investigation of a novel solar thermal polygeneration plant in United Arab Emirates. Renew Energy 91:361–373
Mohan G, Kumar U, Pokhrel MK, Martin A (2016) A novel solar thermal polygeneration system for sustainable production of cooling, clean water and domestic hot water in United Arab Emirates: dynamic simulation and economic evaluation. Appl Energy 167:173–188
ASHRAE (2009) ASHRAE handbook: fundamentals. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, GA
Ibrahim NI, Al-sulaiman FA, Ani FN (2017) Performance characteristics of a solar driven lithium bromide-water absorption chiller integrated with absorption energy storage. Energy Convers Manag 150:188–200
Klein SA, Alvarado FL (2013) Engineering equation solver
Pátek J, Klomfar J (2006) A computationally effective formulation of the thermodynamic properties of LiBr-H2O solutions from 273 to 500 K over full composition range. Int J Refrig 29:566–578
Yazaki Energy System (2003), Specifications Chillers and Chiller-Heater WFC-SC (H) 10, 20, 30 (n.d.)
Martínez JC, Martinez PJ, Bujedo LA (2016) Development and experimental validation of a simulation model to reproduce the performance of a 17.6 kW LiBr–water absorption chiller. Renew Energy 86:473–482
Klein S, Nellis G (2012) Mastering EES. F—Cahrt Software, Madison, WI
Herold EK, Radermacher R, Klein AS (2016) Absorption chillers and heat pumps, 2nd edn. CRC Press, Boca Raton, FL
Acknowledgments
The authors are grateful to Universiti Teknologi Malaysia (UTM) for the award of International Doctoral Fellowship (IDF). We also knowledge the support of the Center of Research Excellence in Renewable Energy at King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Switzerland AG
About this chapter
Cite this chapter
Ibrahim, N.I., Al-Sulaiman, F.A., Ani, F.N. (2020). Energetic Performance Optimization of a H2O-LiBr Absorption Chiller Powered by Evacuated Tube Solar Collector. In: Sayigh, A. (eds) Renewable Energy and Sustainable Buildings. Innovative Renewable Energy. Springer, Cham. https://doi.org/10.1007/978-3-030-18488-9_28
Download citation
DOI: https://doi.org/10.1007/978-3-030-18488-9_28
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-18487-2
Online ISBN: 978-3-030-18488-9
eBook Packages: EnergyEnergy (R0)