Estimation of mean monthly and hourly global solar radiation on surfaces tracking the sun: Case study: Tehran

Gorjian, Shiva; Hashjin, T. Tavakkoli; Ghobadian, Barat

doi:10.1109/icredg.2012.6190457

Cited by 12 publications

(10 citation statements)

References 18 publications

(8 reference statements)

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“…Iran has about 300 sunny days per year, with an average global solar radiation of about 5.3 kWh/m 2 day on a horizontal surface. This value is higher in the central region of the country .…”

Section: Wind and Solar Energy Potential In Iranmentioning

confidence: 75%

Techno‐economic assessment of hybrid renewable resources for a residential building in tehran

Goudarzi

Fazelpour

Gharehpetian

et al. 2019

Env Prog and Sustain Energy

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Continued reductions in air pollution and greenhouse gas (GHG) emissions are crucial in megacities like Tehran, Iran, as they pose serious threats to both people's health and the environment. Reducing energy use through renewable energy projects will result in the mitigation of GHG emissions. Hence, this study was designed to assess the use of renewable energy resources to provide the energy services for a residential building. The specific objective of this article is to select a hybrid renewable energy system that can meet the energy demand of a 5‐story residential building in Tehran. The energy consumption of the building is calculated using DesignBuilder software. Then, HOMER software is applied to propose an economically feasible solar‐wind hybrid system that can meet the energy demand of the building. Initially, information required for HOMER and DesignBuilder software such as the building plan, details on electrical appliances used in the building, solar radiation, wind speed, and cost of renewable systems were collected. Subsequently, the energy performance of the building was simulated in DesignBuilder software and the results were applied to HOMER software. Finally, the hybrid systems proposed by HOMER were economically compared. Furthermore, the emissions produced by the proposed system were evaluated against a diesel only system to assess the amount of offset emissions. The comparison of the hybrid and diesel systems shows that utilization of hybrid systems can significantly reduce the magnitude of GHG emissions along with achieving cost saving. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Section: Wind and Solar Energy Potential In Iranmentioning

confidence: 75%

Techno‐economic assessment of hybrid renewable resources for a residential building in tehran

Goudarzi

Fazelpour

Gharehpetian

et al. 2019

Env Prog and Sustain Energy

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“…T is similar to the electric potential (voltage) change, and Q is similar to the electric current [47]. Heat transfer occurs through three methods of conduction, convection, and radiation, as shown in Figure 3.…”

Section: The Basic Concept Of Heat Transfer and Thermodynamicsmentioning

confidence: 95%

“…The air pressure changes inside the room in the range of −10 °C to +50 °C has been neglected [46]. Mc is similar to the capacitor, T is similar to the electric potential (voltage) change, and Q is similar to the electric current [47].…”

Section: The Basic Concept Of Heat Transfer and Thermodynamicsmentioning

confidence: 99%

“…Where Q is the heat transfer rate by convection in watt (W), A is the surface area in m 2 , h is the heat-transfer coefficient in W m 2 K , and ∆T is the temperature difference between the surface and the fluid in kelvin (K) [47].…”

Section: The Basic Concept Of Heat Transfer and Thermodynamicsmentioning

confidence: 99%

“…where h 1 and h 2 are respectively the heat-transfer coefficients of the first and second environment respectively. A is the surface area, L is the thickness of the wall, and K is the thermal conductivity of the wall [47].…”

Section: The Basic Concept Of Heat Transfer and Thermodynamicsmentioning

confidence: 99%

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Modeling and Controlling of Temperature and Humidity in Building Heating, Ventilating, and Air Conditioning System Using Model Predictive Control

et al. 2019

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Nowadays, by huge improvements in industrial control and the necessity of efficient energy consumption for buildings, unified managing systems are established to monitor and control mechanical equipment and energy usage. One of the main portions of the building management system (BMS) is the cooling and heating equipment called heating and ventilation and air-conditioning (HVAC). Based on temperature slow dynamic and presented uncertainty in modeling, a model predictive control (MPC) strategy to track both temperature and humidity is proposed in this study. The main goal of this study is to provide a framework to describe temperature and humidity elements required for dynamic modeling. Following that, by utilizing a predictive approach, a control strategy is obtained, which optimizes the tracking error of two interactional channel and performs the effort control by minimizing the optimization index. Other articles have mostly only had control over the temperature variable, but in our article, we tried to study the equations of temperature and humidity as well as their interference and according to the ASHRAE standard, both temperature and humidity controls must be accurate. The humidity was the novelty in our article. Simulation results proved the effectiveness of the proposed approach compared to the conventional proportional-integral controller. Evidently, the key idea behind the control objective is providing the comfort condition while consuming the least possible energy.

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Exergoeconomic optimization and sensitivity analysis of a commercial parabolic trough collector for the climate of Tehran, Iran

Hoseinzadeh

Kasaeian

Shafii

2019

Energy Science & Engineering

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The exergoeconomic analysis is a powerful tool to study an energy system and provide rational decision‐making for it. This paper is aimed at exergoeconomic optimization and sensitivity analysis evaluation of the results of a commercial parabolic trough collector (PTC). First, an analysis of optical, thermal, exergy, and economic equations of the PTC system is presented. Then, the objective function and variables are optimized through MATLAB software using the hybrid algorithm code. The objective function as the exergy loss rate is a combination of exergy loss and system cost. The evaluation of the results has been carried out considering the radiation intensity in different months of the year for Tehran, Iran. The commercial parabolic trough solar collector has been selected as the case study. Sensitivity analysis of exergy loss rate and exergy efficiency was conducted for important variables, namely collector length, the glass cover diameter, the outer diameter of absorber tube, the inner diameter of absorber, the fluid inlet temperature, the receiver aperture width, and fluid flow rate. The obtained results show that the exergy loss rate is 0.1905 kW/$, and the exergy efficiency is equal to 15.2% for the highest direct solar radiation of 674 W/m2.

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Estimation of mean monthly and hourly global solar radiation on surfaces tracking the sun: Case study: Tehran

Cited by 12 publications

References 18 publications

Techno‐economic assessment of hybrid renewable resources for a residential building in tehran

Techno‐economic assessment of hybrid renewable resources for a residential building in tehran

Modeling and Controlling of Temperature and Humidity in Building Heating, Ventilating, and Air Conditioning System Using Model Predictive Control

Exergoeconomic optimization and sensitivity analysis of a commercial parabolic trough collector for the climate of Tehran, Iran

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