The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Qi Wu - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of an air source Heat pump for low temperature climates
    Proceedings - 6th International Symposium on Heating Ventilating and Air Conditioning ISHVAC 2009, 2009
    Co-Authors: Mingxue Huo, Shijing Wang, X. Jin, Qi Wu
    Abstract:

    Numerical calculation as a convenient tool is widely used in one-stage compression refrigeration system to investigate different field problems. This paper focuses on the model of an air-source Heat pump (ASHP) for low temperature climates operating in steady-state, which is based on the principle of two-stage compression cycle with two-stage throttling. The full model comprises compressor, expansion valve, Heat exchanger and Heat Recovery Unit, which are separately modelled. The models of receiver and flash tank in ASHP are not taken into account. The model of compressor neglects the mass variation in it, thus the same mass flow rate at the inlet and outlet of compressor is considered. A lumped method is used to model Heat exchangers with phase change, which is chosen in this study in form of ε-NTU. As for Heat Recovery Unit modelled, its Heat absorption capacity form high-stage compressor is determined by experimental data. These models are coupled by using their input and output variables. The numerical model is validated against experimental data, and the simulation results of the Heating capacity and COP compared with experimental data are within ±7.4% error bands. This result indicates that the model can be used to predict important system parameters and can reflect the actual behaviour of the system.

Seung Hak Choi - One of the best experts on this subject based on the ideXlab platform.

  • solar assisted multi stage vacuum membrane distillation system with Heat Recovery Unit
    Desalination, 2015
    Co-Authors: Seung Hak Choi
    Abstract:

    Abstract This paper describes the development of a solar-assisted multi-stage vacuum membrane distillation (SMVMD) system. The proposed system employs Heat Recovery Unit (HRU) for the energy Recovery from the permeate vapor to the feed seawater. Temperature modulating (TM) scheme is also implemented for the attenuation of temperature fluctuations of the feed seawater. A commercial shell-and-tube capillary membrane module consisting of an array of polypropylene hydrophobic fibers has been adopted for the system design and mathematical model development. The SMVMD system is studied for the different numbers of HRUs using a mathematical model. For a solar-assisted VMD system with 24-stage, the total water production of SMVMD system with 10 HRUs is found to be 3.37 m 3 /day, which is about 34% higher as compared to the system with a single HRU. For a VMD system without solar-thermal Unit, the overall specific thermal energy consumption ( OSTEC ) decreases by 20% with an increase in the number of HRUs from 1 to 10. For the different numbers of HRUs in the range of 1–10, the system OSTECs with solar-thermal system having 150 m 2 of evacuated-tube collectors and 16 m 3 seawater storage tanks are 28%–36% lower compared to those without the solar thermal system.

M. D. Bazilian - One of the best experts on this subject based on the ideXlab platform.

  • Thermographic analysis of a building integrated photovoltaic system
    Renewable Energy, 2002
    Co-Authors: M. D. Bazilian, Harry Kamalanathan, D. K. Prasad
    Abstract:

    A residential-scale building integrated photovoltaic (BiPV) cogeneration system has been thermographically investigated. The results are useful in calibrating the numerical models created to predict the system's operational temperatures. The combined Heat and power system is based on existing BiPV roofing technology with the addition of a modular Heat Recovery Unit. The convection of the air behind the panels will serve both to cool the photovoltaic panels and provide a Heat source for the residence. The analysis allows for the interpretation of the surface emissivities and operating temperatures, as well as qualitative graphic analysis of temperature gradients. © 2002 Elsevier Science Ltd. All rights reserved.

  • Thermal and Electrical Performance Monitoring of a Combined BiPV Array and Modular Heat Recovery System
    ISES Solar World Congress, 2001
    Co-Authors: M. D. Bazilian, D. Prasad
    Abstract:

    A residential-scale building integrated photovoltaic (BiPV) cogeneration system has been designed and experimentally tested. The PV cogen system is based on an existing array of BiPV roofing tiles with the addition of a modular Heat Recovery Unit that can be used in new or renovated buildings. The convection of the air behind the panels will serve both to cool the PV panels, and thus help their efficiency and power output, while providing a Heat source for the residence. The system has been continuously monitored for six months at the time of writing. Results and analysis of the experimental data are presented. Performance monitoring has been undertaken at full-building scale. The various benefits of the modular Heat Recovery Unit are expressed in order to create an additional impetus to stimulate the BiPV residential market.

Jose M Ferro - One of the best experts on this subject based on the ideXlab platform.

  • experimental analysis of an air to air Heat Recovery Unit for balanced ventilation systems in residential buildings
    Energy Conversion and Management, 2011
    Co-Authors: Jose Fernandezseara, Francisco J Uhia, Alberto Dopazo, Jose M Ferro
    Abstract:

    This paper deals with the experimental analysis of an air-to-air Heat Recovery Unit equipped with a sensible polymer plate Heat exchanger (PHE) for balanced ventilation systems in residential buildings. The PHE is arranged in parallel triangular ducts. An experimental facility was designed to reproduce the typical outdoor and exhaust air conditions with regard to temperature and humidity. The Unit was tested under balanced operation conditions, as commonly used in practice. A set of tests was conducted under the reference operating conditions to evaluate the PHE performance. Afterwards, an experimental parametric analysis was conducted to investigate the influence of changing the operating conditions on the PHE performance. Experiments were carried out varying the inlet fresh air temperature, the exhaust air relative humidity and the air flow rate. The experimental results are shown and discussed in this paper.

D. K. Prasad - One of the best experts on this subject based on the ideXlab platform.

  • Thermographic analysis of a building integrated photovoltaic system
    Renewable Energy, 2002
    Co-Authors: M. D. Bazilian, Harry Kamalanathan, D. K. Prasad
    Abstract:

    A residential-scale building integrated photovoltaic (BiPV) cogeneration system has been thermographically investigated. The results are useful in calibrating the numerical models created to predict the system's operational temperatures. The combined Heat and power system is based on existing BiPV roofing technology with the addition of a modular Heat Recovery Unit. The convection of the air behind the panels will serve both to cool the photovoltaic panels and provide a Heat source for the residence. The analysis allows for the interpretation of the surface emissivities and operating temperatures, as well as qualitative graphic analysis of temperature gradients. © 2002 Elsevier Science Ltd. All rights reserved.