APPLICATION OF PASSIVE VENTILATION SYSTEM WITH CRAWL SPACE HEATING TO THE PRACTICAL HOUSE : Passive ventilation strategy and systems in cold region Part 2

2000 ◽  
Vol 65 (532) ◽  
pp. 51-56 ◽  
Author(s):  
Akira FUKUSHIMA ◽  
Masamichi ENAI ◽  
Mutuaki MIYAURA ◽  
Yoshinori HONMA
Keyword(s):  
Ventilation System ◽  
Space Heating ◽  
Ventilation Strategy ◽  
Cold Region ◽  
Crawl Space

Ventilation strategy for random pollutant releasing from rubber vulcanization process

2016 ◽  
Vol 26 (2) ◽  
pp. 248-255 ◽  
Author(s):  
Changsheng Cao ◽  
Jun Gao ◽  
Yumei Hou ◽  
Jie Chen
Keyword(s):  
Production Process ◽  
Ventilation System ◽  
Primary Source ◽  
Emission Characteristic ◽  
Ventilation Strategy ◽  
Exhaust Hood ◽  
Cumulative Emission ◽  
Measurement Results ◽  
Vulcanization Process ◽  
Source Emission

This paper investigates the emission characteristic of a rubber vulcanization process in a workshop and tries to formulate a ventilation strategy for the rubber vulcanization production process with a lower exhaust rate. Measurements were performed to derive detailed source emission characteristic of rubber vulcanization process in a rubber workshop. The measurement results show that the primary source emission process was concentrated within 600 s of a vulcanization process, the corresponding cumulative emission percentage reached up to 95%. Based on random pollutant releasing from rubber vulcanization process, a single local exhaust hood was applied for a curing machine, the corresponding exhaust rate of 4000 m3/h was proven to be reliable for capturing rubber fume by the experimental and numerical methods. The corresponding cumulative capture efficiency of the single local exhaust hood was 92.1% at 600 s. A new ventilation system equipped with single local exhaust hood was further designed for the rubber vulcanization production process line, and the total exhaust rate of this system was only a quarter of the original one used in a large exhaust hood system. These findings have illustrated that the new ventilation system equipped with single local exhaust hood could largely reduce the exhaust rate in a rubber vulcanization workshop.

scholarly journals A STUDY ON CRAWL SPACE HEATING WITH SENSIBLE THERMAL STORAGE MATERIALS

2008 ◽  
Vol 73 (626) ◽  
pp. 471-478
Author(s):  
Koji FUJITA ◽  
Atsushi IWAMAE ◽  
Takayuki MATSUSHITA ◽  
Kyoji ISHIZU ◽  
Hiroshi NAKAGAWA
Keyword(s):  
Thermal Storage ◽  
Space Heating ◽  
Storage Materials ◽  
Crawl Space

Biodiesel Fueled Engine Generator With Heat Recovery

2008 ◽  
Author(s):  
Fred Betz ◽  
Chris Damm ◽  
David Archer ◽  
Brian Goodwin
Keyword(s):  
Heat Recovery ◽  
Mechanical Engineering ◽  
Thermal Power ◽  
Ventilation System ◽  
Performance Testing ◽  
Electric Utility ◽  
Hot Water ◽  
Space Heating ◽  
Automation System ◽  
Absorption Chiller

Carnegie Mellon University’s departments of Architecture and Mechanical Engineering have teamed with Milwaukee School of Engineering’s Mechanical Engineering department to design and install a biodiesel fueled engine-generator with heat recovery equipment to supply electric and thermal power to an office building on campus, the Intelligent Workplace (IW). The installation was completed in early September 2007, and is currently being commissioned. Full scale testing will begin in early 2008. The turbocharged diesel engine-generator set is operated in parallel with the local electric utility and the campus steam grid. The system is capable of generating 25 kW of electric power while providing 18 kW of thermal power in the form of steam from an exhaust gas boiler. The steam is delivered to a double-effect Li-Br absorption chiller, which supplies chilled water to the IW for space cooling in the summer or hot water for space heating in the winter. Furthermore, the steam can be delivered to the campus steam grid during the fall and spring when neither heating nor cooling is required in the IW. Additionally, thermal energy will be recovered from the coolant to provide hot water for space heating in the winter, and for regenerating a solid desiccant dehumidification ventilation system in summer. All relevant temperatures, pressures, and flows for these systems are monitored via a building automation system. Pressure versus time measurements can be recorded in each cylinder of the engine. Emissions of nitric oxide (NO), nitrous oxide (NO2), Particulate Matter (PM), and carbon dioxide (CO2) are also monitored. Upon completion of this installation and the system performance testing, the operation of the engine generator with its heat recovery components will be integrated with the other HVAC components of the IW including a parabolic trough solar thermal driven LiBr absorption chiller, a solid desiccant dehumidification ventilation system, and multiple types of fan coils and radiant heating and cooling devices. This energy supply system is expected to reduce the IW’s primary energy consumption by half in addition to the 75% energy savings already realized as compared to the average US office space.

scholarly journals Local exhaust ventilation solutions for an industrial hall – Part 1 CFD analysis of the local exhaust systems

2019 ◽  
Vol 85 ◽  
pp. 02012
Author(s):  
George-Mădălin Chitaru ◽  
Mihnea Sandu ◽  
Cristiana Verona Croitoru ◽  
Florin Bode
Keyword(s):  
Ventilation System ◽  
Preliminary Design ◽  
Cfd Analysis ◽  
Ventilation Strategy ◽  
Treatment Facility ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Pollutant Concentrations ◽  
High Ammonia

Industrial hygiene is an important aspect of any workplace environment, especially for the industrial domain. A previous study has shown that high ammonia levels were present in a wastewater treatment facility in Romania. The initial ventilation strategy was not efficient in maintaining pollutant concentrations within standard safety limits. An optimization of the initial ventilation system was realized, but CFD results and on-site measurements have shown that high local concentrations were still present. Two local exhaust methods have been proposed and analysed in order to improve the quality of the air inside the hall. A CFD approach has been used for the preliminary design process. The results indicate that both local exhaust solutions offer great improvements over the general dilution-based system, but only one can be applied.

scholarly journals Investigation of the Energy Saving Efficiency of a Natural Ventilation Strategy in a Multistory School Building

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1746 ◽  
Author(s):  
Beungyong Park ◽  
Sihwan Lee
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Ventilation System ◽  
Internal Heat ◽  
High Energy ◽  
Ventilation Strategy ◽  
Opening And Closing ◽  
Ventilation Rates

Under-ventilation and high energy consumption are some of the problems associated with school classrooms. Thus, it is necessary to develop a ventilation strategy that is characterized by high energy-saving and ventilation efficiency. To this end, this study aims to investigate natural ventilation as a possible strategy to improve the indoor environment while reducing ventilation loads and maintaining energy costs during intermediate seasons. Ventilation and cooling load reductions based on the opening and closing of several windows were analyzed. Window flow coefficients and ventilation rates were measured and used for computational fluid dynamics (CFD) simulation to obtain pressure coefficients for 16 wind directions. The results obtained showed that the improved natural ventilation strategy could be used to effectively establish required indoor conditions (26 °C, 60% RH). Additionally, compared with the mechanical ventilation system with variable refrigerant flow, this natural strategy resulted in a decrease in energy consumption of approximately 30%. However, its application requires that internal heat gain and CO2 emissions, which depend on human population density, as well as the room usage schedule should be considered.

scholarly journals Optimization Of Natural Ventilation In Building As Passive Design Strategy For Health Security

2020 ◽  
Vol 1 (1) ◽  
pp. 25-31
Author(s):  
Cynthia Permata Dewi
Keyword(s):  
Natural Ventilation ◽  
Ventilation System ◽  
Electrical Energy ◽  
Living Room ◽  
Ventilation Strategy ◽  
Minimum Level ◽  
Air Velocity ◽  
Health Security ◽  
Sliding Windows ◽  
Air Movement

The use of natural ventilation strategy in a building is currently encouraged by the emergence of a pandemic Covid-19. In addition to its advantages in minimizing the use of electrical energy, the natural ventilation system is believed could reduce the possibility of spreading the virus. One design approach to this system is by using the window's design properly. Air movement inside a building should be utilized well to allow the movement from inlet to outlet. The position of the window was one of the variables examined in this study besides the types of the window. This study found that the use of a combination of 300 awnings produced the highest airspeed in the living room (R1), while a combination of horizontal sliding windows resulted in the highest air velocity in the bedroom (R2). Still, the airspeed generated from the two combinations less than the minimum level of it is generally required, 0.75 – 0.9 m/s.

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