SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
This report documents the successful completion of the NREL July milestone entitled “Modeling Lithium-Ion Battery Safety - Complete Case-Studies on Pouch Cell Venting,” as part of the 2013 Vehicle Technologies Annual Operating Plan with the U.S. Department of Energy (DOE). This work aims to bridge the gap between materials modeling, usually carried out at the sub-continuum scale, and the
To inform efforts to improve combustion appliance testing in residential energy efficiency programs, we studied the frequency of coincident fan use and depressurization-induced downdrafting and spillage from atmospherically vented (i.e., natural draft) wall furnaces in airtight apartments. Indoor environmental conditions, heating appliance operation, use of exhaust fans, and cooking with stovetop or oven were monitored for approximately three weeks each in 16 apartment units in two buildings in Northern California. Apartments also were assessed using standard combustion appliance safety test methods and enhanced protocols. Monitoring occurred in February and March of 2016, with heating demand corresponding to 7.3 ± 0.5 heating degree-days at a 65ºF reference temperature. Most of the furnaces spilled combustion products when the apartments were depressurized in the “worst-case” challenge condition of all exhaust fans operating at their highest settings and all windows closed. Many also spilled under less challenging conditions (e.g., with kitchen exhaust fan on low and bathroom fan operating). On average, bathroom exhaust fans were operated 3.9% of monitored minutes (13.5% max), and cooking (burner or kitchen fan operation) occurred 4.6% of minutes (max 13.3%). Event lengths averaged 17 minutes (max 540) and 34 minutes (max 324), respectively. Their coincident operation averaged 0.34% of minutes (max 2.0%), with average event length of 13 minutes (max 92 minutes). This suggests that the operation of apartment units at or near the currently used worst-case challenge condition is quite rare. Wall furnace burners operated an average of 2.8% of minutes (max of 8.9%), with average burner cycle length of 14 minutes (max 162). Coincident bath fan use, cooking and wall furnace operation was very rare, occurring only a handful of times across all apartments. The highest rate was 0.075% of monitored minutes in one apartment, and the longest event length was 12 minutes. Exhaust fan operation in this study may have been more frequent than typical as participants were asked to use an exhaust fan whenever cooking or bathing. Consistent with the low levels of coincident operation, unambiguous spillage occurred in only 4 apartments and the longest event was 5 minutes. The frequency of partial spillage is unknown, owing to a lack of a clear signal from monitored parameters. Downdrafting during exhaust fan use occurred in all 13 of the apartments with relevant data, and 9 of these units had 10 or more events. Exhaust fans also sometimes led to weakened draft, even if downdrafting did not occur. Each unambiguous spillage event identified in the study was immediately preceded by downdrafting. The observed occurrence of downdrafting and spillage may have been impacted in those apartments with the most severe drafting problems (i.e., appliances spilled combustion pollutants under ‘natural’ test conditions), because occupants in these units were instructed to open windows whenever using the kitchen exhaust fan.
LH 2 trailers typically vent significant amounts of vapor following delivery at a refueling station. See for example the picture on Fig. 1 of the vapor cloud due to the depressurization of trailer #7016 at LLNL. That practice is possibly too conservative with regards to the Code of Federal Regulations.
This unit process quantifies the amount of gas vented and flared during natural gas production from condensate tanks through flash losses and tank working and breathing losses. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=A56CF16E-36CC-4AEF-90A5-8E548029FD5D
This unit process quantifies the amount of gas vented and flared during natural gas production from produced water tanks through flash losses and tank working and breathing losses. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=6D0F3F3B-ECC0-4493-91F7-36F10F381427
Venting of natural gas from natural distribution. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=D997D828-6AD2-4A6A-BD94-5A8C821A795C
Venting of natural gas from natural gas through transmission pipeline. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=B7AF3DCC-3A6D-4CD2-A226-7CF89A4A9B23
Venting of natural gas from onshore natural gas processing facilities. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=A9353722-6BBD-41EE-BCE0-298F25FDF37E
Venting of natural gas from natural gas storage operations. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=C22108EE-517F-4371-8F5C-BA2B4FA333AE
Venting of natural gas from natural gas transmission facility operations. To access the model referenced in the report, please visit https://www.netl.doe.gov/energy-analysis/details?id=93CC03B7-F6B4-470F-85F3-CFD429D19FE8
Roundness (or circularity) and flatness measurements are made as part of the dimensional inspection process to certify that iridium alloy Clad Vent Set (CVS) cups meet the dimensional requirements of Iridium Alloy Cup Drawing M2D920101A005, Rev. 4 (see Figure 1). A Mahr Federal (Providence, RI) MarForm MMQ 400 Formtester is specified in the cup inspection Procedure GPHS-C-3624/25, Rev. 25 for roundness (dimension 16) and flatness (dimension 17). The Mahr Federal (Providence, RI) MarForm MMQ 400 Formtester stopped functioning in 2019. A new Mitutoyo RA-2200 Roundness Tester was purchased to replace the MMQ 400. Evaluations were conducted to qualify the new RA-2200 for CVS cup dimensional inspection work. The criterion for qualification was to ensure that the new RA-2200 instrument would yield roundness and flatness inspection results equivalent to or better than the predecessor MMQ 400 instrument.
Current residential air conditioning (AC) and heating units do a decent job at providing overall cooling/heating to a household. However, they usually fall short on accurately controlling which rooms to be heated and cooled. Most homes also require you to manually open or close a vent which can be very inconvenient if in a hard-to-reach area. There is a need for a system capable of automatically measuring and maintaining the thermal environment of each room throughout a house to meet a user’s preferences.
This system design description (SDD) defines the technical, functional, and performance requirements of the Low-Activity Waste (LAW) Facility primary offgas process system (LOP) and the LAW Facility secondary offgas/vessel vent process system (LVP). This document details waste treatment requirements, environmental compliance requirements, and authorization basis requirements of the LOP and LVP systems as they are currently known and understood.
Mechanisms of potential aircraft fuel tank vent fires and explosions caused by atmospheric electricity
Cryogenic propellant venting under low pressure conditions - heat-transfer coefficients for two- phase, single component, solid-gas mixture flow in short, vertical tube
Saturn V/S-IVB stage low gravity fluid mechanics problems and Saturn IB liquid hydrogen orbital experiment to verify propellant ullaging and orbital venting system
Striated cone structure resembling shatter cones in volcanic vent near Albuquerque, New Mexico
Hydrogen vent flare stack performance in adverse weather conditions