The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform

Somchai Wongwises - One of the best experts on this subject based on the ideXlab platform.

  • On the thermal cooling of central processing unit of the PCs with vapor chamber
    International Communications in Heat and Mass Transfer, 2012
    Co-Authors: Paisarn Naphon, Somchai Wongwises, Songkran Wiriyasart
    Abstract:

    Abstract An experimental investigation on the thermal cooling of vapor chamber for cooling computer processing unit of the personal computer is performed. Two different configurations of the vapor chambers with de-ionized water as working fluid are tested under the real operating conditions of PCs. Parametric studies including different aspect ratios, fill ratios, and operating conditions of PC on the CPU temperature are considered. It was found that the vapor chamber cooling technique has significant effect on the thermal cooling of CPU. Average CPU temperatures obtained from the vapor chamber cooling system are 4.1%, 6.89% lower than those from the conventional cooling system for no load and 90% operating loads, respectively. In additional, this cooling system requires 6.89%, 10.53% lower energy consumption for no load and 90% operating loads, respectively. The results of this study are of technological importance for the efficient design of cooling systems of the personal computers or electronic devices to enhance cooling performance.

  • Investigation on the jet liquid impingement heat transfer for the central processing unit of personal computers
    International Communications in Heat and Mass Transfer, 2010
    Co-Authors: Paisarn Naphon, Somchai Wongwises
    Abstract:

    In this paper, the jet liquid impingement heat transfer characteristics in the mini-rectangular fin heat sink for the central processing unit of a personal computer are experimentally investigated. The experiments are tested with three different channel width heat sinks under real operating conditions: no load and full load conditions. The jet liquid impingement cooling with mini-rectangular fin heat sink system is introduced as the active and passive heat transfer enhancement techniques. Effects of relevant parameters on the central processing unit temperature are considered. It is found that the central processing unit temperatures obtained from the jet liquid impingement cooling system are lower than those from the conventional liquid cooling system; however, the energy consumption also increases. The results of this study are of technological importance for the efficient design of cooling systems of personal computers or electronic devices to enhance cooling performance.

Paisarn Naphon - One of the best experts on this subject based on the ideXlab platform.

  • On the thermal cooling of central processing unit of the PCs with vapor chamber
    International Communications in Heat and Mass Transfer, 2012
    Co-Authors: Paisarn Naphon, Somchai Wongwises, Songkran Wiriyasart
    Abstract:

    Abstract An experimental investigation on the thermal cooling of vapor chamber for cooling computer processing unit of the personal computer is performed. Two different configurations of the vapor chambers with de-ionized water as working fluid are tested under the real operating conditions of PCs. Parametric studies including different aspect ratios, fill ratios, and operating conditions of PC on the CPU temperature are considered. It was found that the vapor chamber cooling technique has significant effect on the thermal cooling of CPU. Average CPU temperatures obtained from the vapor chamber cooling system are 4.1%, 6.89% lower than those from the conventional cooling system for no load and 90% operating loads, respectively. In additional, this cooling system requires 6.89%, 10.53% lower energy consumption for no load and 90% operating loads, respectively. The results of this study are of technological importance for the efficient design of cooling systems of the personal computers or electronic devices to enhance cooling performance.

  • Investigation on the jet liquid impingement heat transfer for the central processing unit of personal computers
    International Communications in Heat and Mass Transfer, 2010
    Co-Authors: Paisarn Naphon, Somchai Wongwises
    Abstract:

    In this paper, the jet liquid impingement heat transfer characteristics in the mini-rectangular fin heat sink for the central processing unit of a personal computer are experimentally investigated. The experiments are tested with three different channel width heat sinks under real operating conditions: no load and full load conditions. The jet liquid impingement cooling with mini-rectangular fin heat sink system is introduced as the active and passive heat transfer enhancement techniques. Effects of relevant parameters on the central processing unit temperature are considered. It is found that the central processing unit temperatures obtained from the jet liquid impingement cooling system are lower than those from the conventional liquid cooling system; however, the energy consumption also increases. The results of this study are of technological importance for the efficient design of cooling systems of personal computers or electronic devices to enhance cooling performance.

M.c. Zaghdoudi - One of the best experts on this subject based on the ideXlab platform.

  • Thermal performance of finned heat pipe system for central processing unit cooling
    Energy Conversion and Management, 2020
    Co-Authors: S. Maalej, A. Zayoud, I. Abdelaziz, I. Saad, M.c. Zaghdoudi
    Abstract:

    Abstract This study reports on the thermal performances of a finned air-cooled heat pipe system for CPU cooling. The cooling system includes an aluminum base, three grooved heat pipes, and fins. Experiments are carried out in order to determine the overall thermal resistance of the cooling system in different positions (horizontal, thermosyphon, and anti-gravity positions) under different heat loads. The tests indicate that the overall thermal resistance is the lowest for the thermosyphon position and it is hardly affected by the heat input power. If we consider that the safe operation of the CPU is under continuous junction temperature lower than 90 °C, the cooling system enables to remove heat powers as high as 150 W, 100 W, and 50 W for the thermosyphon, horizontal, and anti-gravity positions, respectively. Modeling of the cooling system allows for the determination of the temperature distribution. The comparison between the experimental temperatures along the heat pipes and those computed indicates a good agreement for heat loads that are lower than the capillary limit.

Yu-chu Tian - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Hybrid central processing unit/ Input–Output Resource Scheduling for Virtual Machines
    IEEE Transactions on Industrial Electronics, 2021
    Co-Authors: Wang Desheng, Weizhe Zhang, Yu-chu Tian
    Abstract:

    The use of virtualization technology in industrial control is increasing. However, virtual instances or virtual machines (VMs) are confronted with the unreasonable resource allocation in the industrial control cyber range, thereby highlighting the increasing importance of resource scheduling. In the Xen open source system, the input–output (IO)-intensive task response is extended because the system does not distinguish between CPU- and IO-intensive tasks. Therefore, this article presents an improved task performance through the hybrid scheduling of CPU and network IO resources. This method uses Cap- and Timeslice-scheduling algorithms for CPU resource scheduling. First, the Cap-scheduling algorithm uses historical data to train a recurrent neural network model for classification and then utilizes the heuristic method to set the upper limit of cap value for VMs. Second, the Timeslice-scheduling algorithm adjusts the timeslice based on Q-learning to shorten the execution time of the overall tasks. This article proposes an IOb-scheduling algorithm for network bandwidth scheduling. The part that does not exceed the average bandwidth is eliminated and distributed to other VMs by monitoring the bandwidth usage of each VM, thereby improving the utilization of bandwidth. Experimental results showed that the proposed CPU/IO scheduling algorithms improved the overall benchmark performance substantially.

Stefan Goedecker - One of the best experts on this subject based on the ideXlab platform.

  • density functional theory calculation on many cores hybrid central processing unit graphic processing unit architectures
    Journal of Chemical Physics, 2009
    Co-Authors: Luigi Genovese, Matthieu Ospici, Thierry Deutsch, Jeanfrancois Mehaut, Alexey Neelov, Stefan Goedecker
    Abstract:

    We present the implementation of a full electronic structure calculation code on a hybrid parallel architecture with graphic processing units (GPUs). This implementation is performed on a free software code based on Daubechies wavelets. Such code shows very good performances, systematic convergence properties, and an excellent efficiency on parallel computers. Our GPU-based acceleration fully preserves all these properties. In particular, the code is able to run on many cores which may or may not have a GPU associated, and thus on parallel and massive parallel hybrid machines. With double precision calculations, we may achieve considerable speedup, between a factor of 20 for some operations and a factor of 6 for the whole density functional theory code.