2019) 'Performance study of solar photovoltaic-thermal collector for domestic hot water use and thermochemical sorption seasonal storage.', Energy conversion and management., 180 .Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract 5To maximise the utilisation of solar energy and improve the solar fraction for domestic applications, this paper 6 explored the potential of the hybrid solar Photovoltaic/Thermal (PV/T) collector integrated with a thermochemical 7 sorption thermal storage system. The thermal output was used to provide domestic hot water or stored over seasons 8 in the England city of Newcastle upon Tyne. The performance of the water-cooled PV/T collectors with or without 9 an air insulation layer between the glass cover and the Photovoltaic (PV) cell was compared. The electrical power 10 generation model of the PV cell developed in MATLAB was coupled with a Computational Fluid Dynamics (CFD) 11 model to simulate the simultaneous generation of electrical and thermal energy. The one-diode model was used to 12 simulate the electrical production of the PV cell with the new correlations of the series resistance and the shunt 13 resistance proposed in this work, so that the accuracy of dynamic performance simulation can be improved 14 especially in the cases with relatively higher PV cell temperature. The water outlet temperature was studied at 15 100 °C to meet the heat supply requirement of the sorption cycle using the working pair strontium chloride-16 ammonia. It was found that the PV/T collector with air gap could produce 133 28 liter hot water per day per m 2 17 collector (L/(day·m 2 )) with the electric efficiency of about 10% if the water outlet temperature was required at 18 100 °C; in contrast, around 28 133 L/(day·m 2 ) was produced with the electric efficiency of 13% when the water 19 outlet temperature at 40 °C. The PV/T collector without air gap was not competent for the applications studied in 20 this work especially in cold regions. The application case studies suggested that an installation of 26 m 2 air-gap 21 PV/T collectors integrated with the strontium chloride-ammonia thermochemical sorption storage system can fully 22 satisfy the annual hot water demand of an ordinary single household in Newcastle upon Tyne with 100% solar 23 sources, and cover at least half of the annual electricity consumption. 24 hot water use; seasonal thermal energy 25 storage; CFD simulation, thermochemical sorption 26 N number of the PV-cell in PV-panel (-) 46 Nusselt number (-) 47 σ Stefan Bol...
This article presents the design of a low-cost Wireless Body Sensor Network (WBSN) for monitoring vital signs including a low-cost smart wristwatch that contains an ESP-32 microcontroller and three sensors: heart rate (HR), blood pressure (BP) and body temperature (BT), and an Internet of Things (IoT) platform. The vital signs data are processed and displayed on an OLED screen of the patient’s wristwatch and sent the data over a wireless connection (Wi-Fi) and a Cloud Thing Board system, to store and manage the data in a data center. The data can be analyzed and notified to medical staff when abnormal signals are received from the sensors based on a set parameters from specialists. The proposed low-cost system can be used in a wide range of applications including field hospitals for asymptotic or mild-condition COVID-19 patients as the system can be used to screen those patients out of symptomatic patients who require more costly facilities in a hospital with considerably low expense and installation time, also suitable for bedridden patients, palliative care patients, etc. Testing experiments of a 60-person sample size showed an acceptable accuracy level compared with standard devices when testing with 60 patient-samples with the mean errors heart rate of 1.22%, systolic blood pressure of 1.39%, diastolic blood pressure of 1.01%, and body temperature of 0.13%. According to testing results with 10 smart devices connected with the platform, the time delay caused by the distance between smart devices and the router is 10 s each round with the longest outdoor distance of 200 m. As there is a short-time delay, it does not affect the working ability of the smart system. It is still making the proposed system be able to show patient’s status and function in emergency cases.
This article presents a field-performance investigation on an Integrated Solar Water Supply System (SWSS) at two isolated agricultural areas in Thailand. The two case-study villages (Pongluek and Bangkloy) have experienced severe draughts in recent decades, and, therefore, water supply has become a major issue. A stand-alone 15.36 kW solar power and a 15 kW solar submersible pump were installed along with the input power generated by solar panels supported by four solar trackers. The aim is to lift water at the static head of 64 and 48 m via a piping length of 400 m for each village to be stored in 1000 and 1800 m3 reservoirs at an average of 300 and 400 m3 per day, respectively, for Pongluek and Bangkloy villages. The case study results show that the real costs of electricity generated by SWSS using solar photovoltaic (PV) systems intergraded with the solar tracking system yield better performance and are more advantageous compared with the non-tracking system. This study illustrates how system integration has been employed. System design and commercially available simulation predictions are elaborated. Construction, installation, and field tests for SWSS are discussed and highlighted. Performances of the SWSS in different weather conditions, such as sunny, cloudy, and rainy days, were analysed to make valuable suggestions for higher efficiency of the integrated solar water supply systems.
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