In this study, the performance of air conditioning system and the level of thermal comfort are de... more In this study, the performance of air conditioning system and the level of thermal comfort are determined in a state hospital located in Kermanshah city in the west of Iran in winter and summer using the Predicted Mean Vote (PMV) model which has been presented by ISO-7730 (2005). The Predicted Mean Vote (PMV) and the Predicted Percentage Dissatisfied (PPD) indices were computed using the data acquired from the experimental measurements performed in the building. The results showed that the values of PMV in some parts of the building, both for men and women, are not within the standard acceptable range defined by ISO. It was found that the most thermal problems in winter occur in morning work shift, and the worst thermal conditions in summer occur in noon work shift. The t-test results revealed that there is no noticeable difference between the thermal conditions of some rooms and those of the surroundings.
In summer 2007, in the city of Athens, Greece, extremely high air temperatures were recorded, ind... more In summer 2007, in the city of Athens, Greece, extremely high air temperatures were recorded, inducing heat discomfort conditions in the urban environment. Four biometeorological indices were calculated in order to evaluate human thermal sensation and thermal comfort: Actual Sensation Vote (ASV), Thermal Sensation-Ginovi method (TS), Discomfort Index (DI) and Heat Load Index (HL). Data included measurements of ambient temperature, temperature of the surrounding ground surface, relative humidity, air pressure, wind velocity and solar radiation obtained from National Observatory of Athens (NOA) station. During this period the daily number of patients probably affected by heat in emergency department units of cardiac clinics of four public general hospitals in Athens was recorded. The results revealed high values of DI and HL indices, demonstrating severe heat stress conditions during the last ten day period of June and July, while the ASV tends to classify too many cases into the comfort zone compared to TS, DI and HL. The statistical analysis revealed a negative relationship between the number of heat affected patients and the estimated indices values.
The occupants of hospitals have widely differing thermal comfort requirements due to their differ... more The occupants of hospitals have widely differing thermal comfort requirements due to their different levels of clothing and metabolism. Using theoretical calculations, this study determines the thermal conditions that are required by three main groups of occupants in Iranian hospitals: patients that are able to be covered, patients that are not able to be covered due to their medical conditions, and staff.The study then investigates the thermal comfort conditions calculated to have been achieved for different occupants in actual Iranian hospitals in an empirical study. The “thermal comfort achieved” findings were derived from basic monitoring of those parameters that affect thermal comfort in 14 rooms in four separate Iranian hospitals. The thermal comfort results calculated for each room are compared with recommended Iranian and international standards for acceptable thermal comfortBased on ANSI/ASHRAE Standard 55, Thermal Environmental Conditions for Human Occupancy, this study found that on average the hospital staff were provided with thermally comfortable conditions for 1% of the monitored time, the patients with a flexible range of clothing insulation achieved thermal comfort 75% of the monitored time, and the patients without blankets achieved thermally comfortable conditions 22% of the monitored time. Overall the thermal comfort conditions recorded during the measurement period were felt to be unacceptable.This study also showed that it is theoretically possible to reconcile these widely varying users' thermal requirements in Iranian hospitals through improved building and system design.
In this study, the performance of air conditioning system and the level of thermal comfort are de... more In this study, the performance of air conditioning system and the level of thermal comfort are determined in a state hospital located in Kermanshah city in the west of Iran in winter and summer using the Predicted Mean Vote (PMV) model which has been presented by ISO-7730 (2005). The Predicted Mean Vote (PMV) and the Predicted Percentage Dissatisfied (PPD) indices were computed using the data acquired from the experimental measurements performed in the building. The results showed that the values of PMV in some parts of the building, both for men and women, are not within the standard acceptable range defined by ISO. It was found that the most thermal problems in winter occur in morning work shift, and the worst thermal conditions in summer occur in noon work shift. The t-test results revealed that there is no noticeable difference between the thermal conditions of some rooms and those of the surroundings.
In summer 2007, in the city of Athens, Greece, extremely high air temperatures were recorded, ind... more In summer 2007, in the city of Athens, Greece, extremely high air temperatures were recorded, inducing heat discomfort conditions in the urban environment. Four biometeorological indices were calculated in order to evaluate human thermal sensation and thermal comfort: Actual Sensation Vote (ASV), Thermal Sensation-Ginovi method (TS), Discomfort Index (DI) and Heat Load Index (HL). Data included measurements of ambient temperature, temperature of the surrounding ground surface, relative humidity, air pressure, wind velocity and solar radiation obtained from National Observatory of Athens (NOA) station. During this period the daily number of patients probably affected by heat in emergency department units of cardiac clinics of four public general hospitals in Athens was recorded. The results revealed high values of DI and HL indices, demonstrating severe heat stress conditions during the last ten day period of June and July, while the ASV tends to classify too many cases into the comfort zone compared to TS, DI and HL. The statistical analysis revealed a negative relationship between the number of heat affected patients and the estimated indices values.
The occupants of hospitals have widely differing thermal comfort requirements due to their differ... more The occupants of hospitals have widely differing thermal comfort requirements due to their different levels of clothing and metabolism. Using theoretical calculations, this study determines the thermal conditions that are required by three main groups of occupants in Iranian hospitals: patients that are able to be covered, patients that are not able to be covered due to their medical conditions, and staff.The study then investigates the thermal comfort conditions calculated to have been achieved for different occupants in actual Iranian hospitals in an empirical study. The “thermal comfort achieved” findings were derived from basic monitoring of those parameters that affect thermal comfort in 14 rooms in four separate Iranian hospitals. The thermal comfort results calculated for each room are compared with recommended Iranian and international standards for acceptable thermal comfortBased on ANSI/ASHRAE Standard 55, Thermal Environmental Conditions for Human Occupancy, this study found that on average the hospital staff were provided with thermally comfortable conditions for 1% of the monitored time, the patients with a flexible range of clothing insulation achieved thermal comfort 75% of the monitored time, and the patients without blankets achieved thermally comfortable conditions 22% of the monitored time. Overall the thermal comfort conditions recorded during the measurement period were felt to be unacceptable.This study also showed that it is theoretically possible to reconcile these widely varying users' thermal requirements in Iranian hospitals through improved building and system design.
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