The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform

Milan N. Šarevski - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of R718 refrigeration/heat pump systems with two-phase ejectors
    International Journal of Refrigeration, 2016
    Co-Authors: Milan N. Šarevski, Vasko N. Šarevski
    Abstract:

    The paper describes investigations of R718 refrigeration cycles with two-phase ejector as a compression device. The complex thermal and flow phenomena inside two-phase ejector flow field are analyzed and characteristics of two-phase ejectors are estimated. Results of investigations of numerous refrigeration systems with two-phase ejectors are analyzed and recommendations for optimal geometric parameters of two-phase ejectors are summarized. Novel R718 refrigeration/heat pump systems are proposed: simple two-phase ejector cooling cycle, two-phase ejector heat pump cycle applied in evaporators–concentrators, and combined compact R718 centrifugal compressor–two-phase ejector water chiller for air Conditioning Application, and their thermal and performance characteristics are estimated.

  • Energy efficiency of the thermocompression refrigerating and heat pump systems
    International Journal of Refrigeration, 2012
    Co-Authors: Vasko N. Šarevski, Milan N. Šarevski
    Abstract:

    From numerous perspectives, water turbocompressor refrigerating systems should become the ultimate choice of refrigerating system in the range of air Conditioning Application. Optimal scheme structure of the R718 centrifugal compressor refrigerating/heat pump systems and comparative analysis of their performance characteristics are given. Among the technical and environmental advantages of the water systems, the direct evaporation and condensation are additional advantageous for the R718 systems concerning COP increment. Two stage centrifugal compressors are an optimal solution for these Applications. An analysis of the thermal characteristics of the industrial concentrators with thermocompression is presented. The complex thermal and flow phenomena in the processes of thermocompression, evaporation and condensation are discussed. The theoretical and experimental investigations on an experimental grape vacuum concentrator and on an industrial NaOH concentrator show that significant increment of the energy efficiency can be achieved by optimal Application of thermocompression in thermal concentrating processes. © 2012 Elsevier Ltd and IIR. All rights reserved.

Vasko N. Šarevski - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of R718 refrigeration/heat pump systems with two-phase ejectors
    International Journal of Refrigeration, 2016
    Co-Authors: Milan N. Šarevski, Vasko N. Šarevski
    Abstract:

    The paper describes investigations of R718 refrigeration cycles with two-phase ejector as a compression device. The complex thermal and flow phenomena inside two-phase ejector flow field are analyzed and characteristics of two-phase ejectors are estimated. Results of investigations of numerous refrigeration systems with two-phase ejectors are analyzed and recommendations for optimal geometric parameters of two-phase ejectors are summarized. Novel R718 refrigeration/heat pump systems are proposed: simple two-phase ejector cooling cycle, two-phase ejector heat pump cycle applied in evaporators–concentrators, and combined compact R718 centrifugal compressor–two-phase ejector water chiller for air Conditioning Application, and their thermal and performance characteristics are estimated.

  • Energy efficiency of the thermocompression refrigerating and heat pump systems
    International Journal of Refrigeration, 2012
    Co-Authors: Vasko N. Šarevski, Milan N. Šarevski
    Abstract:

    From numerous perspectives, water turbocompressor refrigerating systems should become the ultimate choice of refrigerating system in the range of air Conditioning Application. Optimal scheme structure of the R718 centrifugal compressor refrigerating/heat pump systems and comparative analysis of their performance characteristics are given. Among the technical and environmental advantages of the water systems, the direct evaporation and condensation are additional advantageous for the R718 systems concerning COP increment. Two stage centrifugal compressors are an optimal solution for these Applications. An analysis of the thermal characteristics of the industrial concentrators with thermocompression is presented. The complex thermal and flow phenomena in the processes of thermocompression, evaporation and condensation are discussed. The theoretical and experimental investigations on an experimental grape vacuum concentrator and on an industrial NaOH concentrator show that significant increment of the energy efficiency can be achieved by optimal Application of thermocompression in thermal concentrating processes. © 2012 Elsevier Ltd and IIR. All rights reserved.

S. Renganarayanan - One of the best experts on this subject based on the ideXlab platform.

  • Energy Management through Encapsulated PCM Based Storage System for Large Building Air Conditioning Application
    International Energy Journal, 2006
    Co-Authors: Ramalingam Velraj, M. Cheralathan, S. Renganarayanan
    Abstract:

    A detailed study done on the phase change material based cool thermal energy storage (CTES) system integrated with a large building air Conditioning system is presented in this paper. The major focus of this study is to provide the technical information about the encapsulated phase change material (PCM) based storage system for air Conditioning Application and the importance of careful design load calculation. The economic benefits of load shift operations are highlighted. It has been found that the PCM based storage system reduces the monthly demand charges of INR 1.2 million. It is also estimated that cost saving of INR 2.26 million per annum through energy management by scheduling the chiller operation.

  • Energy management through encapsulated PCM based storage system for large building air Conditioning Application (december 2006)
    International Energy Journal, 2006
    Co-Authors: Ramalingam Velraj, M. Cheralathan, S. Renganarayanan
    Abstract:

    A detailed study done on the phase change material based cool thermal energy storage (CTES) system integrated with a large building air Conditioning system is presented in this paper. The major focus of this study is to provide the technical information about the encapsulated phase change material (PCM) based storage system for air Conditioning Application and the importance of careful design load calculation. The economic benefits of load shift operations are highlighted. It has been found that the PCM based storage system reduces the monthly demand charges of INR 1.2 million. It is also estimated that cost saving of INR 2.26 million per annum through energy management by scheduling the chiller operation.

S. Kalaiselvam - One of the best experts on this subject based on the ideXlab platform.

  • Energy conservative air Conditioning system using silver nano-based PCM thermal storage for modern buildings
    Energy and Buildings, 2014
    Co-Authors: R. Parameshwaran, S. Kalaiselvam
    Abstract:

    This work aims at improving the thermal performance and energy efficiency of chilled water based variable air volume air Conditioning system integrated with the silver nanoparticles embedded latent thermal energy storage system. The latent thermal energy storage air Conditioning system incorporated with the demand controlled ventilation and the economizer cycle ventilation schemes were experimentally investigated for the year-round building air Conditioning Application. Phase change material embedded with silver nanoparticles enabled it to exhibit improved heat transfer mechanisms in charging and discharging cycles. Experimental results suggest that the proposed air Conditioning system achieved an on-peak and per day average energy savings potential of 36-58% and 24-51%, respectively, for year round operation while compared to the conventional air Conditioning system. Similarly, while compared with a basically similar variable air volume air Conditioning system, the proposed air Conditioning system yielded 7.5-18.6% and 7.9-17.8% of on-peak and per day average energy conservative potential, respectively. Furthermore, test results infer that the combined effects produced by the silver nanoparticles embedded latent thermal energy storage system with the ventilation techniques augmented the overall thermal performance of the system. In total, the combined air Conditioning system would be beneficial in terms of accomplishing good thermal comfort, acceptable indoor air quality and energy redistribution needs in buildings without sacrificing energy efficiency. © 2013 Elsevier B.V. All rights reserved.

F. Martinez - One of the best experts on this subject based on the ideXlab platform.

  • Wireless sensor nodes for generic signal Conditioning: Application to Structural Health Monitoring of wind turbines
    Sensors and Actuators A: Physical, 2016
    Co-Authors: Z. Herrasti, I. Gabilondo, Aitor Arriola, Iñaki Val, Javier Berganzo, F. Martinez
    Abstract:

    Condition monitoring, fault diagnosis and Structural Health Monitoring (SHM) are an essential part of predictive maintenance. In order to provide early warning of damage, wireless sensor nodes are located at structures, which are often in hostile and hard to access environments. Therefore, there is a need of using sensor nodes with low power signal Conditioning electronics, wide range measurement, synchronous data acquisition and reliable signal transmission within large scale-networks. The sensor nodes developed in this work contain a transducer, a signal Conditioning circuit and a signal processing software, and are powered by a small rechargeable lithium-ion polymer battery. The signal Conditioning circuit is generic and configurable, enabling the Conditioning of accelerometers and strain gages, and the signal acquisition of the nodes is performed through wireless synchronized communication. The performance of the presented device is demonstrated for SHM of wind turbines. The commonly used system for SHM of wind turbines is installed during the construction of the structure and consists of wired sensors connected to a central data acquisition unit via cables. In this respect, the system developed in this work, which forms a wireless sensor network (WSN) for SHM, is compared to the commonly used system for SHM of wind turbines. The developed WSN offers two main advantages with respect to commonly used systems for SHM: installation and maintenance cost, and time, high reduction.