[en] It is shown that it is possible to measure continuously temperatures of plasma-flames up to 5,000 K by using a Xenon-Highpressure-Lamp as a comparison radiator. A method is developed for calibrating a regulable comparison radiator absolutely by knowing only one point of its temperature-curve exactly. (orig.)

[en] Fabrication of quality radiator bars and plates is paramount to a successful DIRC project. This write up discusses the trials and tribulations of the manufacture of ∼600 bars for the BaBar DIRC project and discusses the history and current capabilities of InSync, Inc.

[en] We explore possibilities for THz sources from 0.3-30 THz. While still inaccessible, this broad gap is even wider for advanced acceleration schemes extending from X or, at most, W band RF at the low end up to CO₂ lasers. While the physical implementations of these two approaches are quite different, both are proving difficult to develop so that lower frequency, superconducting RF is currently preferred. Similarly, the validity of modeling techniques varies greatly over this range of frequencies but generally mandates coupling Maxwell's equations to the appropriate device transport physics for which there are many options. Here we study radiation from undulatory-shaped transmission lines using finite-difference, time-domain (FDTD) simulations. Also, we present Monte-Carlo techniques for pulse generation. Examples of THz sources demonstrating coherence are shown with the goal of optimizing on-chip THz radiators for applications that may lead to accelerators

No abstract available

[en] This article describes the use of powder coating materials as an effective corrosion protection system. The correlation between the substrate heating temperature on the optical characteristics of the radiator used and coating material applied was analyzed. The assumption that the process of thermoradiation curing of powder coatings is influenced by two factors (temperature and radiation effect) is confirmed. It was determined that there is a possibility of improving the resource-saving technology based on the conducted studies. (paper)

[en] A field survey of indoor thermal environment was conducted on four office buildings in Harbin. It aims to research the effect of cold radiation on human thermal comfort in winter. The results showed that the average indoor temperature of buildings with floor heating (FH) systems was as high as 27.53 °C, which was 3.2 °C higher than that of the buildings with radiator heating (RH) systems. And thus indoor environment was too warm in FH rooms which seriously affected occupants’ thermal comfort. In addition, FH building was less affected by cold radiation from the external windows and walls. However, people complained local thermal discomfort of legs and feet under the overheated environment. In RH buildings, among the votes of local thermal sensation, a large amount of subjects who were within 2m from external windows voted “cold” and complained “shoulder” and “back” were significantly suffered by the cold radiation from exterior envelope. (paper)

[en] Buildings are typically equipped with a number of elements and devices (such as windows, blinds, luminaires, radiators, and fans) to control indoor environmental conditions. The availability, effectiveness, and usability of control devices and their human interfaces constitute arguably an essential aspect of built environments quality and performance. We refer to this aspect as buildings’ indoor-environmentally relevant “ecological valency” (EV) or the “affordance”. It can be interpreted as a descriptor of buildings’ responsiveness toward inhabitants’ needs and requirements. Despite its critical importance, there is currently a lack of systematic evaluation or certifications procedures for objective characterization of indoor environments’ EV as related to the availability and effectiveness of control devices and their human interfaces. The present contribution explores thus the potential for designing and implementing formal procedures toward measurement and certification of indoor environments’ EV. (paper)

[en] Automotive radiator played an essential role as a heat exchanger that exchange the circulated heated coolant inside the engine compartment to return into its ambient temperature. Radiator cooling fan that attached at the back of radiator, is a device that work to regulate the coolant temperature when the heated coolant is passed inside the radiator tubes. It produces external flow of air that passes through the fins and tubes of the radiator. However, this external flow contributes high noise level into the system. In consequence of this risk, a detailed experimental study on noise analysis to identify the location of maximum sound pressure level (SPL) generated by variations of cooling fan speed by using sound intensity mapping method is presented. Ethylene Glycol (EG)-water based was used as working fluid operate with engine temperature range from 80 to 90 °C. The cooling fan speed of radiator cooling fan were varied from 750 to 1250 rpm and the water flowrates were 8.0, 11.0, and 14.0 l/min. The results indicate that the noise level is increasing with the fan speed. However, there is no significance difference of change in coolant flow rate and type of coolant fluids to the noise level. The location of maximum sound pressure level is identified and the higher SPL value most located on the blade trailing edge of the suction surface with highest SPL value of 81 db for 1250 rpm fan speed. The project delivers the reliable input for the engineering practice to reduce automotive radiator noise level. (paper)

[en] This paper presents a set of parametric studies performed on automotive radiators by means of a detailed rating and design heat exchanger model developed by the authors. This numerical tool has been previously verified and validated using a wide experimental data bank. A first part of the analysis focuses on the influence of working conditions on both fluids (mass flows, inlet temperatures) and the impact of the selected coolant fluid. Following these studies, the influence of some geometrical parameters is analysed (fin pitch, louver angle) as well as the importance of coolant flow lay-out on the radiator global performance. This work provides an overall behaviour report of automobile radiators working at usual range of operating conditions, while significant knowledge-based design conclusions have also been reported. The results show the utility of this numerical model as a rating and design tool for heat exchangers manufacturers, being a reasonable compromise between classic ε - NTU methods and CFD

[en] The device allows economic repair of large straight-tube type heat exchangers by inspecting all tubes one after the other with respect to tightness and tightly sealing defective tubes in one working step. For this purpose nearly equal testing equipment is installed within the inlet and outlet chambers outside the tube plate on both ends of the heat excahnger. The devices are first brought into the correct position with respect to the tube muzzles by means of electric-hydraulic remote-control and then fixed in this position. At first each pipe is approached by a test piston and, through bores contained in it, subjected to a gaseous testing medium. If a tube is found to be tight the next one will be approached. If a tube is not tight at both ends explosion rivets are introduced into this tube; these are ignited by a heated filament and the tube is tightly closed. Outside the intervention zone each of the spaceous instruments is folded up to about half its volume, so that it may be inserted into the two chambers; within the chamber each instrument is folded out into operating position by its own drive mechanism. The device may also be used for contaminated heat exchangers, e.g. for recuperators and coolers in high-temperature reactors. (ORU)