Abstract
Two solar polygeneration systems were investigated for electricity, cooling and fresh water production. In the first scenario ( LF PS ), the linear Fresnel (LF) solar field was used as thermal source of the Organic Rankine Cycle (ORC), absorption chiller (ACH) and multi-effect desalination (MED) unit. In the second scenario ( PV PS ), photovoltaic (PV) panels were considered as the electricity source to supply the electricity load that is required for lighting, electrical devices, compression chiller (CCH) and reverse osmosis (RO) units. A techno-economic comparison was made between two scenarios based on the land use factor (F), capacity utilization factor (CUF), payback period, levelized cost of electricity (LCE), levelized cost of cooling energy (LCC) and levelized cost of water (LCW). The calculations were conducted for four different locations in order to determine the effect of solar radiation level on the LCE, LCC and LCW of systems in both scenarios. The results showed that the LCE and LCW of PV PS is lower than that of LF PS and the LCC of LF PS is lower than that of PV PS . Also, the payback period of LF PS and PV PS systems are obtained as 13.97 years and 13.54 years, respectively, if no incentive is considered for the electricity sale.
Highlights
One of the most promising, endless and free renewable energy resources is solar energy.The worldwide renewable energy capacity has grown by 85% during the last decade [1]
For the linear Fresnel (LF) solar field, the numbers of required LF modules were calculated based on the Direct Normal Radiation (DNI) of the region, area of the modules, the specified input and output temperature of 70 °C and 185 °C respectively for the solar field as well as the required thermal energy and mass flow rate that should be assigned into the system components
Field, the numbers of required LF modules were calculated based on the DNI of the region, area of the modules, the specified input and output temperature of 70 °C and 185 °C respectively for the solar field as well as the required thermal energy and mass flow rate that should be assigned into the system components
Summary
One of the most promising, endless and free renewable energy resources is solar energy. Several alternatives can be considered to decrease the fossil fuel consumption and the environmental pollution, such as renewable-based distributed generation, district heating and cooling and polygeneration systems [9]. The present paper deals with design and comparative feasibility analysis of two renewable polygeneration systems powered by solar energy to produce electricity, fresh water and space cooling for a community located on the southern coast of Iran in the Persian Gulf. Both systems were supposed to be connected to district electricity, heating and cooling networks.
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