GCRIS

Now showing 1 - 2 of 2

Evaluation of Thermal Comfort Conditions During Training in Physical Fitness Spaces
(01. Izmir Institute of Technology, 2024) Avcı, Ali Berkay; Başaran, Tahsin
Presently, fitness centers have become extensively occupied spaces. These higher-activity-level spaces require different thermal comfort parameters than other indoor environments. Therefore, it is crucial to provide the comfort that users need during their physical exercise. Human body during exercise requires different thermal comfort conditions and higher fresh air supply rates than sedentary activities. The standards for fitness centers do not provide specialized thermal and spatial instructions for the fitness spaces. This thesis focuses on investigating the thermal and spatial conditions of exercise spaces. To determine ideal exercise space conditions, a thermal and flow analysis involving experiments and 3D simulations in a computer environment were employed. The study specifically examined spatial factors such as ceiling height, lateral and frontal distances between machines, and vent locations, along with thermal factors like inlet temperature and air velocity. A thirty-minute constant work rate exercise test at moderate intensity was conducted in a controlled climatic chamber with six participants. The experiment's conditions were replicated and verified in CFD software using the collected data. Then, computational models for various environmental and spatial scenarios for a five-person cycling class were generated. Employing the L9 orthogonal arrays method, nine spatial scenarios with three thermal operations were simulated. Optimal factor levels were determined based on thermal comfort conditions by predicted mean vote (PMV) around the thermal plumes. The findings indicated that a ceiling height of 5m, lateral and frontal distances of 1m and 0.5m between machines, and ventilation strategy with ceiling located inlets at a condition of 18°C and 0.2m•s-1 performed optimal results.
Investigations of Indoor Thermal and Air Flow Conditions in a Tobacco Warehouse
(01. Izmir Institute of Technology, 2023) Gerçek, Mümine; Başaran, Tahsin
This study investigates the thermal performance and indoor environment conditions of naturally and hybrid ventilated industrial buildings. Numerical analyses and experimental measurements were conducted in a tobacco warehouse in İzmir, Turkey. Parametric analyses were performed with three different approaches: i) 15 architectural design strategies are evaluated by using a sensitivity analysis. It is found that roof insulation thickness, shading projection factor, and shading angle have significant impact on heating and cooling requirements. In addition, the most influential factors on operational CO2 emissions are thickness of insulation material and conductivity of thermal insulation material. ii) Vertical and volumetric temperature gradients, crucial for stored product quality, are assessed through field measurements and CFD simulations. Ceiling-mounted radiant cooling systems reduced indoor temperatures by 3°C, while floor heating systems increased temperatures by 7°C, ensuring a consistent range of 21- 25°C by providing a range at defined indoor temperature values. Maximum loads are determined as 12.9W/m2 for cooling and 39.6W/m2 for heating. iii) The air change effectivenesses of different ventilation conditions are analysed. Four additional fans improved air exchange quality and decreased the volumetric mean age of air (AoA) from 1230 to 525 seconds. It is indicated that, while additional fans may decrease the mean AoA, maximizing the fan operation capacities is not obligatory to achieve increased air change effectiveness. Besides, the analysis of various fan operation scenarios significantly improves indoor environment conditions and energy efficiency. This thesis emphasizes the importance of design parameters in influencing indoor environmental conditions and energy consumption. The investigation of thermal air mixing and conditioning strategies underscores the need for a combined experimental and numerical approach. The findings contribute to effective solutions for warehouses storing temperature-sensitive products, ensuring optimal storage conditions and mitigating temperature variations during logistics operations.

Phd Degree / Doktora

Browse

Filters

Settings

Sort By

Results per page

Search Results