A novel developed method to study the energy/exergy flows of buildings compared to the traditional method
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A novel developed method to study the energy/exergy flows of buildings compared to the traditional method Raaid Rashad Jassem Al Doury1 · Thamer Khalif Salem1 · Ibrahim Thamer Nazzal1 · Ravinder Kumar2 · Milad Sadeghzadeh3 Received: 17 July 2020 / Accepted: 21 August 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The present article focuses on finding a more accurate method to draw the energy and exergy flows that have drawn previously by many researchers. These days the accuracy of the flow is more important because there are some consequent calculations which depend on them such as the exergoeconomic analysis. The present method depends on the real data of energy and exergy analyses for each component of the building’s system. Energy, exergy, and exergoeconomic analyses were achieved on the Al-Andalus model school that is chosen as a case study. The results reveal that there are no differences between total energy and exergy demands estimation for both methods which are 1832 GJ and 1530 GJ, respectively. Although there are real differences in energy/exergy losses and efficiencies of some components and the exergoeconomic results, the developed method provided more accurate results in the energy/exergy losses and efficiencies calculations. For instance, the exergy losses of generation in traditional and developed methods are 934 GJ and 725 GJ, respectively. Moreover, the cost of energy demand that is calculated by the developed method represents the real cost (37,000 USD), whereas its estimated value by traditional method is 40,500 USD. Based on the comparison, adopting this method in the potential calculations achieves closer results to the reality that can lead to more improvements in building’s performance analyses. Keywords Energy analysis · Exergy analysis · Exergoeconomic · Building heating system List of symbols A Transmission area of the surface (m2) c Specific cost (USD GJ−1) cp Specific heat (kJ kg−1 K−1) E Energy (W) * Ibrahim Thamer Nazzal [email protected] * Ravinder Kumar [email protected] Raaid Rashad Jassem Al Doury [email protected] Thamer Khalif Salem [email protected] Milad Sadeghzadeh [email protected] 1
Department of Mechanical Engineering, College of Engineering, Tikrit University, Tikrit, Iraq
2
Faculty of Mechanical Engineering, Lovely Professional University, Phagwara, Punjab 144411, India
3
Department of Renewable Energy and Environmental Engineering, University of Tehran, Tehran, Iran
F Correction factors I Radiation intensity (W m−2) n Air exchange rate P Electrical energy (W m−2) T Temperature (°C) U Overall heat transfer coefficient (W m−2 K−1) V Volume of the building (m3) V̇ Volume flow rate (m3 s−1) X Exergy (W) Greek symbols ρ Density (kg m−3) 𝜂 Efficiency (%) 𝜓 Exergy (kJ kg−1) 𝜙 Heat losses or energy gain Δ Losses Subscripts app Appliances aux Auxiliary buil Building D Demand Dis Distribution e Energy
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Vol.:(0123456789)
elec Electrical emis Emission ex Exergy g Glass G Generator
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