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Shrinking reserves of natural resources as well as incisive environmental pollution oblige humanity to rethink its generally favored propulsion concept: in the last decade electro-mobility as a refurbished technology gained greater significance once more. Due to political course setting, many German cities are testing Electric Vehicles (EV) especially in public bus transport. To get to the bottom...
Energy efficient Heating Ventilation Air Conditioning (HVAC) systems are required to off-set the rising cost of electricity and to reduce the amount of natural resources consumed. The implementation of alternative energy saving technologies is often not realized due to various factors hampering the implementation thereof. Thermally Activated Building Systems (TABS) is one of such technologies that...
This work uses TRNSYS simulations with archetypal residential and commercial building energy demand data to evaluate the performance of a multi-building energy hub with a combined cooling, heating, and power (CCHP) system. Within this framework, conventional and combined heat and power (CHP) energy generation technologies are implemented in different scenarios to meet the cooling, heating, and domestic...
This paper deals with a high power oil-cooled electrical eddy current retarder (EECR), which is used in heavy vehicles like armored cars, large trucks, etc. Firstly, the braking torque are deduced based on electromagnetic theory, and an inner-rotor EECR is designed preliminarily to satisfy the performance requirement presented for a certain vehicle brake system. Then, a special oil-cooling system...
The thermal analysis of high speed machine is necessary made to check of serviceability. The temperatures of electric machine individual parts influence other aspects of electric machine design. This paper deals with modeling of thermal phenomena of high seed asynchronous machine. The main requirement for this model is easy integration into electromagnetic model. The Computational fluid dynamics (CFD)...
The paper aims to study which type of orifice type (round or square) is more efficient for an induction motor fan cowl, in order to obtain an increased air flow rate. The analysis begins from an already existing fan cowl (with square orifices) and it is shown that it is possible to improve the air flow rate. The chosen efficiency parameter is the flow coefficient, which is calculated using computational...
Multifunctional spaceborne blackbody system was developed to improve the accuracy in estimating the temperature of the blackbody surface by integrating with micro-heaters, micro-coolers, and micro-temperature sensors for on-board calibration of image sensors in space applications. Consequently, a lightweight, low power consumption, high accuracy blackbody system has been realized. The temperature...
Our understanding of human behavior is limited and consequently lacks a standard formal model of human behavior that could represent relevant behavior in social-ecological systems. In this paper we explore the consequences of alternative behavioral models using a simple dynamic system of agents of harvesting daisies in the well-known Daisyworld model. We explore the consequences of different behavioral...
This paper proposes a scheme which drives a processor beyond its rated operation frequency, e. g., by exploiting Intel’s boost technology, to digest the peak workload of the system in time. In the setting of deadline constrained workloads, this is far from trivial: the boost mode can only be used during short time spans, therefore it can only help to digest the peak workload, rather than serving the...
This paper presents the design of a Dynamic Matrix of Control “DMC” to control exothermic processes, multi-stages type, in batch reactors in order to enhance the production quality. To reach these aims, a set of mathematics models based on the Volterra Series and Laguerre functions are introduced. The obtained results suggest that these systems identified based on mathematical criteria together with...
The thermal performance of 2.5D package with integrated processor and 2 memory stacks has been investigated, and 4 types of thermal lids without increasing the package footprint has been designed and evaluated. The heat dissipation capabilities of different structures were first analyzed under natural convection condition, and then forced air cooling condition was considered in portable device scenario...
Magnetic resonance imaging systems are highly sensitive to heating. This paper discusses the heating generated by the gradient coils and proposes an automatic procedure to define the optimal layout of the cooling pathways. The procedure is based on an integrated magneto-thermal analysis iteratively coupled to a topological optimization routine.
The temperature rise in the automobiles during the parking in sunny days is a critical issue which creates uncomfortable feelings for the passengers. Here we develop an affordable mini air conditioning system for the automobiles. The heat buildup in inside of the vehicle is fully investigated and the energy require for cooling is also estimated. Our finding provides an attractive solution to prevent...
In this work, we develop a 3D architecture that utilizes STT-RAM for the last level cache (LLC). 3D integration enables large LLCs to be stacked onto a die. However, 3D architectures suffer from higher operating temperatures due to increased power densities. The elevated temperatures can adversely impact the STT-RAM performance and reliability. The objective of this paper is to address the limits...
The working fluid plays an important role in the flow and heat transfer performance of impingement jet. Though a lot of fluids such as air, water and oil, have been widely used in jet applications, there lack research works focus on the impacts of fluid properties on the overall heat transfer performance. This paper made comprehensive comparisons of five jet fluids (air, helium, water, FC-77 and MIL-7808)...
A possibility to reduce energy losses and increase overload capacity of a synchronous variable-frequency drive in continuous operating periodic duties by means of automatic control is considered in the article. The results of comparison of relevant laws of variable-frequency control used for motors with different cooling methods are given.
Aceh as one of Indonesian province has some hot springs potencies that can be utilized to generate electricity by organic Rankine cycle (ORC) system. This paper discusses energy and exergy assessment of ORC with hot spring as the heat source in Aceh, Indonesia. Energy and exergy assessment are utilized to evaluate ORC performance. The performance are evaluated from the hot springs that have temperature...
Absorption chillers are the devices that required low grade thermal energy for instance waste heat of plant or renewable energy resources such as geothermal, solar etc. As absorption systems operate over lower coefficient of performance (COP) ranges therefore it is necessary to optimize the performance of these system. In this work, second law analysis and optimization of double effect series flow...
A prolonged period of ageing behavior on polyethylene samples containing a gas-filled cavity has been investigated using diagnostic assessment methods to develop understanding of the causes of dielectric failure. In this experiment, low density polyethylene (LDPE) samples are made using a multiple layer technique. The experimental results detail the investigation for correlation between the partial...
Constant search of new Bill of Material (BOM) has enable back end manufacturing industry to provide lower die free package cost annually, thus stretching the product lifecycle. A thorough characterization and optimizing the new material behavior in mass manufacturing environment is as important as obtaining life test results of the end product meeting customer requirements. BOM contributing to high...
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