Evaluation of Thermal Comfort in an Iranian Educational Hospital Using PMV- PPD Model

Background: Considering the advancement of technology and application of various appliances in the workplace, one of the most significant current discussions in the industrial and nonindustrialized workplaces is thermal comfort. Hospital staff have a special status because of the diversity of people employed in hospitals and their crucial roles. Objectives: The present study aimed at investigating the staffs’ thermal comfort in a hospital in Esfahan. Methods: In this cross-sectional study, Al Zahra hospital staff working in the underground floor were recruited. The sampling method was census, and 161 staff participated in the study. Data were collected by mental assessment using a questionnaire and physical measurement using wet bulb globe temperature (WBGT) machine in the summer of 2015. The predicted mean vote (PMV) and predicted percentage dissatisfied (PPD) were determined based on mental assessment or individual feeling of the staff about thermal comfort. Data management and analyses were performed using SPSS 23. Results: The results of the data analysis revealed that kitchen, laundry, and sterilization sectors had higher temperature than other units. Moreover, the results demonstrated that the offices of educational sectors and educational classes had a standard level of thermal comfort according to ASHRAE (American society of heating, refrigerating and air-conditioning engineers) Standard 55. The investigations of physical and mental PMV in every unit showed that the total index of these 2 values was 1.2 and 1.39, respectively. Conclusions: Based on the results, the units located at the underground floor needed proper design and access to natural ventilation and enough air flow to provide optimum thermal comfort based on international standards.