Intersystem fault between MMC‐HVDC and AC systems and its impact on DC/AC protection

Wind-Thermal Generation Coordination in Multi-Terminal HVDC-Connected AC Systems for Improved Frequency Support

13th IET International Conference on AC and DC Power Transmission (ACDC 2017) ◽

10.1049/cp.2017.0058 ◽

2017 ◽

Cited By ~ 1

Author(s):

T. Joseph ◽

J. Gonçalves ◽

C.E. Ugalde-Loo ◽

J. Liang

Keyword(s):

Thermal Generation ◽

Ac Systems

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Performance Improvement of Membrane Energy Exchanger using Ultrasound for HVAC Application

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4052855 ◽

2021 ◽

pp. 1-29

Author(s):

Gurubalan Annadurai ◽

Maiya M.P. ◽

Patrick Geoghegan ◽

Carey Simonson

Keyword(s):

Air Conditioning ◽

Energy Recovery ◽

Mass Transfer Process ◽

Porous Membrane ◽

Air Conditioning System ◽

Energy Saving Potential ◽

Recovery Processes ◽

Additional Resistance ◽

Membrane Energy ◽

Ac Systems

Abstract Air conditioning (AC) systems consume the maximum proportion of the total electricity used in the building sector. The demand of AC systems is expected to increase exponentially in the coming years due to various reasons such as climate change, increasing affordability and increase in living floor space. Membrane-based liquid desiccant AC system along with energy recovery ventilating equipment is considered as a prospective alternative to the conventional air conditioning system (CACS) and has the potential to meet the increasing current and future AC demand in a sustainable manner. Its efficiency and energy saving potential with respect to CACS depends on the performance of the membrane-based dehumidifier, regenerator and energy recovery ventilating equipment which are commonly referred to as membrane energy exchangers (MEEs). MEE is an indirect exchanger type in which the working streams are separated by a porous membrane. This intermediate membrane creates an additional resistance for the heat and mass transfer process in the MEE. To reduce the resistance, this study experimentally and numerically investigates the influence of ultrasound on the performance of the MEE for dehumidification, humidification (applicable for membrane-based evaporative cooling and desiccant regeneration devices) and energy recovery processes. It is found that the vibration due to ultrasound has the potential to improve the effectiveness of the MEE by 55% in the dehumidification process and by 65% in the humidification and energy recovery processes.

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