Re: Design Of Thermal Systems Stoecker Pdf Free 60
Pamula Harrison
Description: Design, analysis, and optimization of thermal systems. Systems analysis applied to heat exchanger, power conversion, air conditioning, refrigeration, and heat recovery systems. Economics, equation fitting, and thermal property evaluation are integrated into the simulation and optimization of thermal system designs.
Software: You can use any software package to solve homework and design project problems. I recommend the use of Engineering Equation Solver (EES), which can be downloaded from software.pitt.edu.
This chapter considers the design of thermal systems, focusing on simulation, feasible design, and optimization. Though most thermal systems have been modeled and simulated extensively, the results obtained have, in many cases, not been used to design and optimize the process. This chapter reviews the basic concepts of design of thermal systems, based on simulation as well as experimentation, and discusses strategies that may be employed to design and optimize the system. Many complexities, such as strong property variations, complicated domains, conjugate mechanisms, chemical reactions, and intricate boundary conditions, are often encountered in practical thermal processes and systems. The basic approaches that may be used to accurately simulate these systems are outlined. The link between the process and the resulting output is critical, particularly in areas like manufacturing. Thus it is important to couple the modeling and experimental data with the performance and design of the system. Optimization in terms of the operating conditions, as well as of the system hardware, is needed to minimize costs and enhance product quality and system performance. Different optimization strategies that are currently available and that may be used for thermal systems are outlined. Several practical processes from a wide range of applications, such as manufacturing, thermal management of electronic systems, energy, environment, and security, are considered in greater detail to illustrate these approaches, as well as to present typical simulation and design results. Validation of the mathematical and numerical model is particularly important and is discussed in terms of existing results, as well as new experimental data. Similarly, feasibility of the process, choice of operating conditions from inverse solutions, knowledge-based design, combined experimental and numerical inputs for design, sensitivity, uncertainty, and other important aspects are presented. Most thermal systems have more than one objective of interest, leading to multi-objective optimization, which is briefly presented. The current state of the art and future needs in design of thermal systems are discussed.
The main scope of this course is to present and develop the fundamental concepts about heating, ventilating and air conditioning of buildings and related systems. The topics related with health and thermal comfort, building thermal behavior and loads, psichrometric processes, ventilation principles and the HVAC components and systems, will give the students the necessary background to proceed in the design, analysis and operation of HVAC systems.
Molecular diagnostics has become essential in the identification of many infectious and neglected diseases, and the detection of nucleic acids often serves as the gold standard technique for most infectious agents. However, established techniques like polymerase chain reaction (PCR) are time-consuming laboratory-bound techniques while rapid tests such as Lateral Flow Immunochromatographic tests often lack the required sensitivity and/or specificity.
Here we present an affordable, highly mobile alternative method for the rapid identification of infectious agents using pulse-controlled amplification (PCA). PCA is a next generation nucleic acid amplification technology that uses rapid energy pulses to heat microcyclers (micro-scale metal heating elements embedded directly in the amplification reaction) for a few microseconds, thus only heating a small fraction of the reaction volume. The heated microcyclers cool off nearly instantaneously, resulting in ultra-fast heating and cooling cycles during which classic amplification of a target sequence takes place. This reduces the overall amplification time by a factor of up to 10, enabling a sample-to-result workflow in just 15 minutes, while running on a small and portable prototype device. In this proof of principle study, we designed a PCA-assay for the detection of Yersinia pestis to demonstrate the efficacy of this technology. The observed detection limits were 434 copies per reaction (purified DNA) and 35 cells per reaction (crude sample) respectively of Yersinia pestis.
PCA offers fast and decentralized molecular diagnostics and is applicable whenever rapid, on-site detection of infectious agents is needed, even under resource limited conditions. It combines the sensitivity and specificity of PCR with the rapidness and simplicity of hitherto existing rapid tests.
Copyright: 2021 Mller et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Competing interests: I have read the journal's policy and the authors SD, LU, JS and FB of this manuscript have the following competing interests: SD is working for GNA biosolutions. LU, JS and FB are the founders and CEOs of GNA biosolution.
To address these different limitations that existing methods present, we introduce an ultra-fast, yet sensitive and specific method for the nucleic-acid based detection of infectious agents, i.e. pulse- controlled amplification (PCA). As a proof of concept we developed a PCA-assay for the detection of Y. pestis under standard lab-conditions using both purified DNA and crude culture material as samples. Furthermore, we illustrate its applicability as a POC test for clinical samples without prior nucleic acid extraction (using Y.pestis spiked sputum samples). Finally, we also demonstrate the field usability of PCA in a bioterrorism context wearing heavy personal protective equipment, thus illustrating a broad range of possible applications of PCA relevant for the diagnostics of neglected tropical diseases such as pneumonic plague.
Currently, PCA is performed on a prototype instrument, the Pharos Micro (GNA Biosolutions, Martinsried, Germany) utilizing prototype disposable chips, which contain the amplification reactions (GNA Biosolutions, Martinsried, Germany). To optimize assays, different parameters of the run are adjustable, including base and lid temperature of the Pharos Micro [C], heating time [μs], cycle time [s], number of cycles, and thermalizing time [s]. For primer design, the guidelines in Table 1 should be followed. For successful PCA, it is critical to avoid primer dimers when designing primers, especially for the thiolated-primer used for functionalization of the wires.
Upper panel: The current model 8-well duplex manual sample-to-answer prototype system for research and assay development, using the PCA approach. Middle panel: Schematic view (right) showing the concept of the instrument: The disposable chip (yellow) is sandwiched between two heat blocks (grey) used to set the base temperature. Transmission fluorescence measurements (multicolour LEDs on top, photodiodes on the bottom) for hydrolysis probe chemistry as well as a schematic of the circuit to drive PCA, which basically only requires a capacitor and a fast switch (i.e. a MOSFET) to deliver the pulses necessary for localized heating. Lower panel: prototype chip. Each PMMA-chip has eight wells with 75 ultra-thin gold-coated tungsten micro wires running through the entire chip at the bottom of every well.
Chips were functionalized with the (thiol-modified) forward primer. Primer was diluted in functionalization buffer 2 (GNA Biosolutions, Martinsried, Germany) to a final concentration of 500 nM. 50 μl of primer dilution was loaded into each well and incubated for 20 minutes at room temperature. Functionalization solution was removed and wells were washed five times with demineralized water. After washing, chips were tapped out and the dry chips were stored at 4C until further use. Chips were prepared fresh every morning, however they can be stored for up to five days without significant loss of efficiency. The Chips are single use only.
Y. pestis pla gene specific primers and probes were designed based on alignment studies using BLAST and the sequence database of the National Centre for Biotechnology Information (NCBI). The primer pair and probe showing best results in pilot experiments were used for PCA experiments (Table 2) Primers and probe were obtained from Ella Biotech (Martinsried, Germany). The forward primer was modified as depicted in Table 2, including a Thiol-modification, a poly-A portion and an internal spacer. All reactions were performed using a freeze-dried mastermix (GNA Biosolutions, Martinsried, Germany), containing all necessary components. Optimal concentrations for all components were determined in pilot experiments and final concentrations are shown in Table 3. For PCA, mastermix was dissolved in the appropriate amount of DNAse-free water to achieve a final reaction volume of 40 μl.
For samples containing purified genomic DNA as template, lyophilized mastermix was dissolved in 316.8 μl DNAse-free water. 36 μl of mastermix was loaded into each well of the chip and 4 μl of template was added. When using bacterial culture material and spiked sputum as samples, an initial thermal lysis and binding of the target DNA to the primers attached to the wires was performed prior to PCA: 60 μl/well of liquid culture material was loaded. Chips were sealed and placed in the Pharos Micro for 5 min (with 66C base temperature). After incubation, culture material was removed and discarded, lyophilized mastermix was dissolved in 352 μl DNAse free water and 40 μl was added directly to each well.
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