Detailed measurements of aerodynamic heating rates in the wake of a Mars-Pathfinder configuration model have been made. Heating data were obtained in a conventional wind tunnel, the NASA LaRC 31" Mach 10 Air Tunnel, and in a high-enthalpy impulse facility, the NASA HYPULSE expansion tube, in which air and CO2 were employed as test gases. The enthalpy levels were 0.7 MJ/kg in the Mach 10 Tunnel,...

Jonsson, A. 2006. Planning for Increased Bioenergy use – Strategies for Minimising Environmental Impacts and Analysing the Consequences. Licentiate thesis. ISSN 1651-0720 There are several goals aimed at increasing the use of renewable energy in the Swedish energy system. Bioenergy is one important renewable energy source and there is a potential to increase its use in the future. This thesis a...

In this study, beech wood was treated in hot oil and in hot air to determine the differences in the effects of the two processes on the physical properties of the wood. Heat treatment was conducted at temperatures of 160, 190, and 220 °C for 2 h at atmospheric pressure. After the heat treatment, various properties of the wood, including mass increase in hot oil treatment (wt% gain), mass loss i...

The article shows results of studies on assessing the effectiveness new principles for heat recovery exhaust air in ventilation systems apartment buildings (AB). Technological solutions are known that provide heating supply systems. efficiency such can reach 90%, but only coldest five-day period year with maximum temperature difference between and air. At all other times season, recuperative ex...

Gas turbine (GT) performance is primarily dependent on the inlet air temperature. The power output of gas flow mass through turbine. This why at hot weathers with less dense air, drops, but cold weather high rises. cooling (IAC) technology one major drivers that enhance performance, especially during weathers. affected by various factors such as cooling, fuel type, heating value, temperature, h...

This work examines the ability of small-scale helium–air mixture coaxial jets to simulate the acoustics of largescale hot air jets representing the exhaust of separate-flow turbofan engines. Experiments employed a one-eighthscale model of a separate-flow nozzle used in hot tests at NASA John H. Glenn Research Center. Comparisons were conducted for two set points using the following methods: mat...

This article presents a bottom-up approach for calculation of the useful heat demand for space heating and hot water preparation using geo-referenced datasets for buildings at the city level. This geographic information system (GIS) based approach was applied in the case study for the city of Krakow, where on the one hand the district heat network is well developed, while on the other hand ther...

We processed applesauce, tomato juice, and cranberries in pint jars in a boiling water canner to test thermal processing theories against home canning of high-acid foods. For each product, thermocouples were placed at various heights in the jar. Values for f h (heating), f cl (cooling), and F 82.2°C (lethality) were determined for each thermocouple location, and did not depend substantially on ...

We examined the feasibility of providing ambient air during exercise and conditioned (cooled) air during rest on reducing physiological strain and optimizing tolerance time. Six male soldiers attempted 250-min exposures in hot/dry and hot/wet environments. Subjects wore chemical protective clothing over the combat vehicle crewman uniform and an air-cooled vest. They alternated between 50 min of...