The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform

Long Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Working fluid selection for a small-scale organic Rankine cycle recovering engine waste heat
    Energy Procedia, 2017
    Co-Authors: Anthony Paul Roskilly, Long Jiang
    Abstract:

    Abstract This paper reports the design and evaluation of a 1 kWe Organic Rankine cycle using different working fluids for engine coolant and exhaust recovery from a 6.5 kW small ICE. Six working fluids have been selected to evaluate and compare the performance of the ORC system. The net power output, thermal efficiency, rotational speed of the scroll expander and Condenser Load of the ORC system have been studied. Results indicated R134a and R125a have better overall performance than other candidates when the designed inlet temperature of the expander is higher than 150 °C. The highest net power and thermal efficiency are respectively 1.2 kW and 13% when R125a is used as the working fluid. R600 and R245fa are desirable to be used when the optimal rotational speed of the scroll expander is about 3000 RPM. The proposed ORC engine coolant and exhaust waste heat recovery system has the advantages of simple system layout, low dumped heat Load of Condenser, high power output.

Vojislav Novakovic - One of the best experts on this subject based on the ideXlab platform.

  • Data fusion heat pump performance estimation
    Energy and Buildings, 2011
    Co-Authors: Natasa Djuric, Gongsheng Huang, Vojislav Novakovic
    Abstract:

    The aim of the study was to develop improved measurements on heat pump performance. A model-based approach was combined with data fusion technique to estimate performance of a heat pump. These improved heat pump performance measurements implied fused measurement between direct and indirect measurements of compressor power and Condenser Load. Developed models of compressor power and Condenser Load used input data from building energy management system to produce measurements on the heat pump performance. The direct measurements were obtained by using the temperature and pressure measurements, while the indirect measurements were obtained using the electrical signal of the heat pump part Load. The results showed a big need for use of different data sources to define real energy performance metrics. Further, the analysis on obtained measurements showed that indirect and fused measurements were more reliable than only direct measurement, particularly for the Condenser Load. Use of only direct measurements could result in higher estimation of electricity and heating energy consumption than the real consumption is. The analysis of fused measurements on the heat pump performance showed that such improved measurement could enhance heat pump performance verification.

Anthony Paul Roskilly - One of the best experts on this subject based on the ideXlab platform.

  • Working fluid selection for a small-scale organic Rankine cycle recovering engine waste heat
    Energy Procedia, 2017
    Co-Authors: Anthony Paul Roskilly, Long Jiang
    Abstract:

    Abstract This paper reports the design and evaluation of a 1 kWe Organic Rankine cycle using different working fluids for engine coolant and exhaust recovery from a 6.5 kW small ICE. Six working fluids have been selected to evaluate and compare the performance of the ORC system. The net power output, thermal efficiency, rotational speed of the scroll expander and Condenser Load of the ORC system have been studied. Results indicated R134a and R125a have better overall performance than other candidates when the designed inlet temperature of the expander is higher than 150 °C. The highest net power and thermal efficiency are respectively 1.2 kW and 13% when R125a is used as the working fluid. R600 and R245fa are desirable to be used when the optimal rotational speed of the scroll expander is about 3000 RPM. The proposed ORC engine coolant and exhaust waste heat recovery system has the advantages of simple system layout, low dumped heat Load of Condenser, high power output.

Natasa Djuric - One of the best experts on this subject based on the ideXlab platform.

  • Data fusion heat pump performance estimation
    Energy and Buildings, 2011
    Co-Authors: Natasa Djuric, Gongsheng Huang, Vojislav Novakovic
    Abstract:

    The aim of the study was to develop improved measurements on heat pump performance. A model-based approach was combined with data fusion technique to estimate performance of a heat pump. These improved heat pump performance measurements implied fused measurement between direct and indirect measurements of compressor power and Condenser Load. Developed models of compressor power and Condenser Load used input data from building energy management system to produce measurements on the heat pump performance. The direct measurements were obtained by using the temperature and pressure measurements, while the indirect measurements were obtained using the electrical signal of the heat pump part Load. The results showed a big need for use of different data sources to define real energy performance metrics. Further, the analysis on obtained measurements showed that indirect and fused measurements were more reliable than only direct measurement, particularly for the Condenser Load. Use of only direct measurements could result in higher estimation of electricity and heating energy consumption than the real consumption is. The analysis of fused measurements on the heat pump performance showed that such improved measurement could enhance heat pump performance verification.

Sayan Sadhu - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study of Domestic Refrigerator Performance Improvement with Evaporative Condenser
    International Journal of Air-Conditioning and Refrigeration, 2021
    Co-Authors: Kawal Preet Singh Khalsa, Sayan Sadhu
    Abstract:

    Evaporation of defrosted water in household refrigerators and Condenser waste heat utilization has been reported by many researchers but limited literature is available on the study of evaporative cooling in domestic refrigerators (Condenser waste heat utilization for defrost water evaporation) with helical coil heat exchangers. This paper is concerned with evaluating domestic refrigerator performance by employing an evaporative helical coil heat exchanger before hot wall Condenser which is utilized for evaporation of defrost water and reducing the superheated refrigerant temperature to condensing temperature to reduce the Condenser Load and improve the overall performance of a domestic refrigerator. Results show that evaporative cooling increases COP of the system by 25.3%, reduces the energy consumption of the refrigerator by 7.3% and the compressor run time by 10.6%. These experimental results also revealed that using two different thermal conductivity tube materials for evaporative helical coil Condenser (Copper tube and Zinc coated steel tube) provided with less wall thickness (0.2[Formula: see text]mm) PVC coating results in good agreement for the same evaporation rate of defrosted water.