Study of Electrochromic (EC) and Gasochromic (GC) Glazing for Buildings in Aspect of Energy Efficiency Cover

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Study of Electrochromic (EC) and Gasochromic (GC) Glazing for Buildings in Aspect of Energy Efficiency

Architecture, Civil Engineering, Environment

Volume 14 (2021): Issue 3 (September 2021)

By: Janusz MARCHWIŃSKI

Open Access

|Oct 2021

Figures & Tables

General structure and principle of operation of electrochromic (EC) and gasochromic glass (GC) [5]

Average U-value comparison of commercial glass including EC and GC technology [6]

Values of visible solar transmittance for EC products at different modes they are in [13]

Tv to g-value (SHGC) relationship of selected glazing technologies including EC and GC [14]

Tv to g-value (SHGC) relationship of EC and selected solar/thermal protective static glazing technologies [15]

Transition period for various switchable glazing technologies, including EC and GC glazing - visible transmittance as a time variable [5]

Energy demand for heating and cooling of office spaces in three different locations across Europe, depending on the technology and parameters of window glazing, including switchable glazing (EC/GC) [21]

HVAC loads of different glazing systems, including EC and GC, in 5 different regions across China (left) (by the author, on the basis of [14]). Energy saving potential of EC and GC glazing for the studied locations

Energy demand for heating and cooling in three different climatic conditions in Europe using four different types of glazing, including EC and GC [20]

Heating Energy (kWh/m²a)
	Low-eDGUU=1.3W/(m²K)g=0.60	Solar-controlDGUU=1.1W/(m²K)g=0.33	ECTGUU=1.1W/(m²K)g=0.15-0.40	GCTGUU=0.9W/(m²K)g=0.18-0.48
Rome	3.7	5.5	5.8	4.9
Brussels	16.6	20.3	19.9	17.2
Stockholm	33.8	39.4	37.9	33.1
Cooling Energy (kWh/m²a)
Rome	45.5	24.2	14.1	15.2
Brussels	16.3	6.8	3.0	3.4
Stockholm	18.8	7.3	2.6	3.1

EC and GC glazing as well as various types of static glazing studied with reference to the impact on energy efficiency of a virtual office building for 5 different climatic conditions in China [14]

Glazing system types	ID	g (SHGC)	Tv
#1: Clear Float glass	8205	0.758	0.746
#2: Solar Control glass	8253	0.585	0.671
#3: Low-E glass	8307	0.562	0.704
#4: Colored absorbing glass (Green)	8209	0.575	0.622
#5: Clear Float+Clear float DGU	8205+8205	0.670	0.670
#6: Solar Control+Clear float glass DGU	8253+8205	0.510	0.602
#7: Low-E+Clear float glass DGU	8307+8205	0.530	0.641
#8: Colored absorbing +Clear float glass DGU	8209+8205	0.450	0.558
#9: SAGE@EC+ Clear float glass DGU	Bleached stateColored state	0.4520.141	0.5250.013
#10: GC+Clear float glass DGU	Bleached stateColored state	0.6500.287	0.5460.155

Climatic characteristics (annual values of outside air temperature and irradiation) for Chinese cities covered by simulation studies [23]

	Average lowest temperature values (°C)	Average highest temperatura values (°C)	Irradiation (kWh/m²)
Beijing	-4	+26
Chonguing	-15	+23
Guangzhou	+ 14	+29	1300
Harbin	-18	+23
Shanghai	+5	+28

Percentage of reduced cooling and lighting energy of EC, GC glazing and solar protective static glazing for different ratios of window to floor (WFR) area in offices in hot climate (southern Egypt) [24]

	North		East		South		West
	CoolingEnergy	LightEnergy	CoolingEnergy	LightEnergy	CoolingEnergy	LightEnergy	CoolingEnergy	LightEnergy
8% WFR
EC	38	20	30	35	40	42	32	30
GC	22	20	25	34	32	41	27	30
TC	15	19	21	30	26	37	24	26
Blue	11	30	18	31	19	38	21	26
Green	11	16	17	41	18	48	21	35
Brown	9	25	16	36	16	43	19	31
16% WFR
EC	28	41	32	52	36	56	35	47
GC	26	41	28	52	31	55	30	45
TC	22	33	22	47	25	53	24	40
Blue	19	33	18	47	15	52	20	40
Green	19	48	18	56	15	57	19	49
Brown	17	41	16	52	12	55	16	45
24% WFR
EC	31	54	40	52	40	59	43	51
GC	25	54	34	52	34	58	36	57
TC	20	48	26	47	27	57	29	54
Blue	16	50	22	47	19	58	25	54
Green	16	57	21	56	18	59	25	53
Brown	13	55	19	52	15	59	23	50
32 WFR
EC	35	57	43	60	46	61	45	57
GC	30	57	38	60	40	60	41	57
TC	25	54	30	58	32	59	33	54
Blue	19	55	23	59	21	59	25	54
Green	19	59	23	60	20	60	25	59
Brown	16	58	21	60	16	59	23	57

Evaluation of EC and GC glazing in terms of their impact on the energy efficiency of the building [by the author]

	Climate
	Cold		Moderate		Hot
	EC	GC	EC	GC	EC	GC
HVAC	+	+ +	+ +	+	+ +	+
– cooling, - air conditioning	+	+	+ +	+	+ +	+
– heating	+/-	+	+/-	+	-	+/-
HVAC + lighting	+	+ +	+	+	+ +	+
HVAC + lighting	evaluation predicted: further research required				+ +	+

DOI: https://doi.org/10.21307/acee-2021-020 | Journal eISSN: 2720-6947 | Journal ISSN: 1899-0142

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Language: English

Page range: 27 - 38

Submitted on: Feb 22, 2021

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Accepted on: Sep 7, 2021

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Published on: Oct 8, 2021

Published by: Silesian University of Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Electrochromic (EC) glass,

Energy-efficient buildings,

Gasochromic (GC) glass,

Solar façades,

Solar architecture,

Switchable glazing

Related subjects:

Architecture and design,

Architects, buildings

© 2021 Janusz MARCHWIŃSKI, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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