Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia

Buildings in tropical countries such as Malaysia are exposed to excessive amount of solar heat during daytime occupancy. In addition to that, the outdoor air contains excessive humidity due to the nature of the climate. Air-conditioning system is the main energy consumer of the buildings, more so w...

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Main Author:	Azizuddin, Abd Aziz
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TH Building construction
Online Access:	http://umpir.ump.edu.my/id/eprint/12065/1/AZIZUDDIN%20BIN%20ABD%20AZIZ.PDF
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id	my-ump-ir.12065
record_format	uketd_dc
spelling	my-ump-ir.120652021-08-24T02:45:52Z Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia 2014 Azizuddin, Abd Aziz TH Building construction Buildings in tropical countries such as Malaysia are exposed to excessive amount of solar heat during daytime occupancy. In addition to that, the outdoor air contains excessive humidity due to the nature of the climate. Air-conditioning system is the main energy consumer of the buildings, more so with the requirement of the full 12 months cooling period in the country. The increasing demand of energy due to its status as a developing country puts Malaysia in a critical situation in terms of building sustainability. Another quandary associated with tropical environment is the indoor thermal comfort due to the high humidity. The usage of normal air-conditioning system means that the room has to be overcooled in order to bring down the humidity. Unfortunately, the low temperature set-point technique is neither comfort cautious nor energy friendly. There is an option to solve the humidity problems by the use of the outdoor air treatment system which neutralizes the incoming fresh air into the room. However, high equipment cost renders the system unfavorable in Malaysia. Therefore, the viable solution to the high latent load requires an innovative system that is affordable, runs at relatively low energy consumption yet be able to provide satisfactory indoor thermal comfort. In the research, a new air-conditioning approach termed Dual ABU (air handling unit) system is proposed to be the answer. The simplicity in arrangement and control setup ensures that the system can be reasonably priced. On top of that, it can be designed as an add-on configuration to the existing air-conditioning. The function of Latent AHU in the proposed system is to remove moisture from the conditioned room up to the desired humidity level and in the process the room temperature is also fractionally reduced. The Sensible AHU completes the task by removing the remaining sensible heat so that the room temperature is maintained at the required set-point. By reducing the relative humidity to 50%, a much lower value than that of the normal air-conditioning could offer, room temperature of the new system is shifted higher to 26°C in order to reduce the energy consumption. However, thermal comfort of the occupants has not been compromised. The performance of the proposed system is evaluated through simulation approach. The result shows that the new system could offer energy savings of between 10.2 to 13.6% in constant-air-volume configuration and between 10.7 to 13.2% in variable-air-volume configuration compared to normal air-conditioning system. The procedure to design of the proposed system using manual calculation and psychrometric chart is also being clarified. In addition, the possibility to retrofit the new system into existing air-conditioning system is explained at the end of the research. 2014 Thesis http://umpir.ump.edu.my/id/eprint/12065/ http://umpir.ump.edu.my/id/eprint/12065/1/AZIZUDDIN%20BIN%20ABD%20AZIZ.PDF application/pdf en public phd doctoral Kyushu University School of Human-Environment Studies
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TH Building construction
spellingShingle	TH Building construction Azizuddin, Abd Aziz Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
description	Buildings in tropical countries such as Malaysia are exposed to excessive amount of solar heat during daytime occupancy. In addition to that, the outdoor air contains excessive humidity due to the nature of the climate. Air-conditioning system is the main energy consumer of the buildings, more so with the requirement of the full 12 months cooling period in the country. The increasing demand of energy due to its status as a developing country puts Malaysia in a critical situation in terms of building sustainability. Another quandary associated with tropical environment is the indoor thermal comfort due to the high humidity. The usage of normal air-conditioning system means that the room has to be overcooled in order to bring down the humidity. Unfortunately, the low temperature set-point technique is neither comfort cautious nor energy friendly. There is an option to solve the humidity problems by the use of the outdoor air treatment system which neutralizes the incoming fresh air into the room. However, high equipment cost renders the system unfavorable in Malaysia. Therefore, the viable solution to the high latent load requires an innovative system that is affordable, runs at relatively low energy consumption yet be able to provide satisfactory indoor thermal comfort. In the research, a new air-conditioning approach termed Dual ABU (air handling unit) system is proposed to be the answer. The simplicity in arrangement and control setup ensures that the system can be reasonably priced. On top of that, it can be designed as an add-on configuration to the existing air-conditioning. The function of Latent AHU in the proposed system is to remove moisture from the conditioned room up to the desired humidity level and in the process the room temperature is also fractionally reduced. The Sensible AHU completes the task by removing the remaining sensible heat so that the room temperature is maintained at the required set-point. By reducing the relative humidity to 50%, a much lower value than that of the normal air-conditioning could offer, room temperature of the new system is shifted higher to 26°C in order to reduce the energy consumption. However, thermal comfort of the occupants has not been compromised. The performance of the proposed system is evaluated through simulation approach. The result shows that the new system could offer energy savings of between 10.2 to 13.6% in constant-air-volume configuration and between 10.7 to 13.2% in variable-air-volume configuration compared to normal air-conditioning system. The procedure to design of the proposed system using manual calculation and psychrometric chart is also being clarified. In addition, the possibility to retrofit the new system into existing air-conditioning system is explained at the end of the research.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Azizuddin, Abd Aziz
author_facet	Azizuddin, Abd Aziz
author_sort	Azizuddin, Abd Aziz
title	Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
title_short	Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
title_full	Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
title_fullStr	Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
title_full_unstemmed	Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia
title_sort	air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in malaysia
granting_institution	Kyushu University
granting_department	School of Human-Environment Studies
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/12065/1/AZIZUDDIN%20BIN%20ABD%20AZIZ.PDF
_version_	1783731959231414272

Air-conditioning system with simultaneous control of sensible and latent heat for building energy conservation in Malaysia

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