Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation

Xiaozhou Wu; Lei Fang; Bjarne W. Olesen; Jianing Zhao

doi:10.1007/978-3-642-39584-0_7

Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation

Xiaozhou Wu
, Lei Fang
, Bjarne W. Olesen
, Jianing Zhao

Harbin Institute of Technology

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h^-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement
ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.

Original language	English
Title of host publication	Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning
Publisher	Springer
Publication date	2014
Pages	59-67
Chapter	7
ISBN (Print)	978-3-642-39583-3
ISBN (Electronic)	978-3-642-39584-0
DOIs	https://doi.org/10.1007/978-3-642-39584-0_7
Publication status	Published - 2014
Event	8th International Symposium on Heating, Ventilation and Air Conditioning - Xi' An, China Duration: 19 Oct 2013 → 21 Oct 2013 Conference number: 8 http://www.ishvac2013.org/v2/index.php

Conference

Conference	8th International Symposium on Heating, Ventilation and Air Conditioning
Number	8
Country/Territory	China
City	Xi' An
Period	19/10/2013 → 21/10/2013
Internet address	http://www.ishvac2013.org/v2/index.php

Series	Lecture Notes in Electrical Engineering
Volume	261
ISSN	1876-1100

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title = "Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation",

abstract = "The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.",

author = "Xiaozhou Wu and Lei Fang and Olesen, \{Bjarne W.\} and Jianing Zhao",

year = "2014",

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language = "English",

isbn = "978-3-642-39583-3",

series = "Lecture Notes in Electrical Engineering",

publisher = "Springer",

pages = "59--67",

booktitle = "Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning",

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Wu, X, Fang, L , Olesen, BW & Zhao, J 2014, Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation. in Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning. Springer, Lecture Notes in Electrical Engineering, vol. 261, pp. 59-67, 8th International Symposium on Heating, Ventilation and Air Conditioning, Xi' An, China, 19/10/2013. https://doi.org/10.1007/978-3-642-39584-0_7

Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation. / Wu, Xiaozhou; Fang, Lei ; Olesen, Bjarne W. et al.
Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning. Springer, 2014. p. 59-67 (Lecture Notes in Electrical Engineering, Vol. 261).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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T1 - Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation

AU - Wu, Xiaozhou

AU - Fang, Lei

AU - Olesen, Bjarne W.

AU - Zhao, Jianing

N1 - Conference code: 8

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N2 - The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.

AB - The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.The present study investigated different combinations of floor/ceiling heating with mixing/displacement ventilation and their impacts on the indoor air distribution and ventilation effectiveness. Measurements were performed in a room during heating season in December. The results show that indoor vertical air temperature differences and air velocities for different hybrid systems are less than 3 C and 0.2 m/s when supply air temperature is 19 C, air change rate is 4.2 h-1, and heated surface temperature of floor/ceiling heating system is 25 C. Ventilation effectiveness of mixing ventilation system combined with floor/ceiling heating systems is approximately equal to 1.0, and ventilation effectiveness of displacement ventilation system combined with floor/ceiling heating systems ranges from 1.0 to 1.2. The floor/ceiling heating systems combined with mixing ventilation system have more uniform indoor air distribution but smaller ventilation effectiveness compared with the floor/ceiling heating systems combined with displacement ventilation system. With regard to the building heat loss increased by non-uniform indoor air distribution and small ventilation effectiveness, there should be an optimal combination of floor/ceiling heating with mixing/displacement ventilation to have the minimal building heat loss.

U2 - 10.1007/978-3-642-39584-0_7

DO - 10.1007/978-3-642-39584-0_7

M3 - Article in proceedings

SN - 978-3-642-39583-3

T3 - Lecture Notes in Electrical Engineering

SP - 59

EP - 67

BT - Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning

PB - Springer

T2 - 8th International Symposium on Heating, Ventilation and Air Conditioning

Y2 - 19 October 2013 through 21 October 2013

ER -

Air Distribution and Ventilation Effectiveness in a room with Floor/Ceiling Heating and Mixing/Displacement Ventilation

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