Amir Mohammad Jadidi

Semnan University · Department of Mechanical Engineering

Abstract: This paper investigates the effects of chair burning on the concentration of toxic gases and heat exhaust in a cinema hall. Different ventilation systems, including displacement ventilation (DV), impingement jets ventilation (IJV), stratum ventilation (SV), and hybrid ventilation (combination of displacement and stratum ventilation) were...

Over time, many studies have proven the advantages of using chilled ceiling systems as an assistant device for covering the barriers of the stratified air distribution systems. However, previous investigations are still insufficient, especially in analyzing indoor air quality. With the aid of the computational fluid dynamics techniques and Airpak s...

Recently, many investigations have been performed on return vent height; showing that the height of 1.3 m from the floor is the best height for this vent. In this article, the effect of distance between opening diffuser and return vent was investigated on air quality, thermal comfort and energy saving. The results showed, by increasing the distance...

In this article, combining the under-floor air distribution (UFAD) with personalized ventilation (PV) system, we tried to improve the performance of a UFAD system. The simulation of PV-UFAD system was investigated in a small office room with two office workers, in Airpak-Fluent software. Two Vertical desk grills (VDG) were considered on the desks o...

Phase change materials are substances that absorb and release thermal energy during the process of melting and freezing. This characteristic makes PCM a favourite choice to integrate it in buildings. Stephan problem including melting and solidification in PMC materials is an practical problem in many engineering processes. The position of the movin...

In this article, combining the under-floor air distribution (UFAD) system with improved desk displacement ventilation (DDV+), we tried to solve the barriers of both systems. Computational fluid dynamics (CFD) was employed for evaluation of the local thermal discomfort, the indoor air quality (IAQ), general thermal comfort indices, cooling energy sa...

سیستم های تهویه اختلاطی، تهویه جابه جایی و تهویه زیر سطحی از جمله سیستم هایی هستند که امروزه بسیار مورد توجه قرار گرفته اند. در سیستم تهویه جابه جایی محل قرار گیری دریچه ورودی می تواند نقش مهمی را در شکل گیری پروفیل دمایی عمودی هوا ایفا کند و بر روی شاخص های آسایش حرارتی، میزان نارضایتی موضعی تأثیر بگذارد. بنابراین با بررسی حالات مختلف مکان دریچه ه...