Experimental assessment of energy tower's performance: evaluation of the impacts of solar radiation, humidity, and chimney's height on the overall efficiency.

Solar energy is one of the most feasible options to produce energy in countries where unexploited desert areas or solar radiation are abundant. An energy tower is an effective system for electrical power generation that can perform more efficiently along with solar radiation. As the primary aim of the present study, effects of different environmental parameters on total efficacy of energy tower were investigated. In this study, the efficiency of the energy tower system is investigated experimentally by an indoor fully adjustable apparatus. In this regard, a comprehensive set of influencing parameters like air velocity, humidity, and temperature and the effects of tower height on the performance of the energy tower are individually assessed. It is demonstrated that there is a direct relationship between an increase in humidity percentage of the surrounding and performance of energy tower, meaning that a 274% increase in humidification rate led to 43% elevation in airflow velocity. The kinetic energy increases in the direction of airflow from top to bottom, and as the height of the tower lengthens, the kinetic energy enhances and subsequently increases the overall efficiency of the tower. An elevation about 2.7% in airflow velocity was seen due to an increase from 180 to 250 cm in chimney height. Although the energy tower performs efficiently in the nighttime, airflow velocity increases averagely about 8% during the daytime and at the peak of the solar radiation, the airflow velocity enhances by 58% compared to nighttime.

Kimura disease of the breast: Case report and literature review of current management.

We report a rare case of Kimura disease in a 50-year old female patient who attended our tertiary level Breast Surgery Clinic.

Toothpick impaction in a sigmoid diverticulum.

A 70-year-old woman presented to our emergency department with recurrent episodes of left lower quadrant pain. She subsequently underwent high anterior resection with working diagnosis of acute diverticulitis, but intraoperatively was found to have perforated sigmoid diverticulum due to toothpick impaction. A high index of suspicion is required for diagnosis of toothpick ingestion. Appropriate preoperative investigations such as endoscopy and CT, despite their fairly low sensitivity, should be performed to increase the ability to accurately diagnose this condition and therefore optimise subsequent management.