Applicability analysis of insulation in different climate zones of China

Applicability analysis of insulation in different climate zones of China

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Energy Procedia 142 Energy Procedia 00(2017) (2017)1835–1841 000–000 www.elsevier.com/locate/procedia

9th International Conference on Applied Energy, ICAE2017, 21-24 August 2017, Cardiff, UK

Applicability analysis of insulation in different climate zones of The 15th International Symposium on District Heating and Cooling China c heat demand-outdoor Assessing the feasibility of busing the Huizhong Luoa, Xia Liang *, Jun Lu , Xingxing Zhangd temperature function for a long-term district heat demand forecast Department of Architecture and Built Environment, University of Nottingham Ningbo China, Zhejiang 315100, P.R. China a

b

c

Research Centre for Fluids and Thermal Engineering, The University of Nottingham Ningbo China, Zhejiang 315100, P.R. China a,b,cCity Infrastructure a and Technologya Innovation (D-Citi),b The University of Nottingham c c Research Centre for Digital Ningbo China, Zhejiang 315100, P.R. China d a DepartmentTechnology of Energy, Forest and Built Environments, Dalarna University, Falun, Sweden Lisbon, Portugal IN+ Center for Innovation, and Policy Research - Instituto Superior Técnico, Av.SE-79188 Rovisco Pais 1, 1049-001

I. Andrić c

*, A. Pina , P. Ferrão , J. Fournier ., B. Lacarrière , O. Le Corre

b Veolia Recherche & Innovation, 291 Avenue Dreyfous Daniel, 78520 Limay, France Département Systèmes Énergétiques et Environnement - IMT Atlantique, 4 rue Alfred Kastler, 44300 Nantes, France

Abstract Abstract In this paper we evaluated the applicability of the widely-used passive design strategy i.e., insulation, in three typical climate zones of China. Software IES VE was used for modelling and simulation of performance of insulation in a residential house. The District behavior heating networks areChinese commonly addressed in thewere literature as for oneanalyzing of the most solutions for decreasing the practical patterns of family from survey utilized the effective thermal characteristics of the house. greenhouse gas of emissions from theselected buildingfor sector. Thesethe systems require of high investments which areofreturned the heat Four parameters the results were analyzing performance insulation in three cities China. through The conditions sales. Due to periods the changed climate were conditions andonbuilding policies, heat demand in the future could decrease, varying in time and locations compared the basisrenovation of the simulation. prolonging the investment return period. The main scope of this paper is to assess the feasibility of using the heat demand – outdoor temperature function for heat demand © 2017 The Authors. Published by Elsevier Ltd. forecast. The district of Alvalade, located in Lisbon (Portugal), was used as a case study. The district is consisted of 665 Peer-review under responsibility of the scientific committee of the 9th International Conference on Applied Energy. buildings that vary in both construction period and typology. Three weather scenarios (low, medium, high) and three district renovation scenarios were developed (shallow, intermediate, deep). To estimate the error, obtained heat demand values were Keywords: Passive design, insulation, climate zones, building occupant schedule compared with results from a dynamic heat demand model, previously developed and validated by the authors. The results showed that when only weather change is considered, the margin of error could be acceptable for some applications (the error in annual demand was lower than 20% for all weather scenarios considered). However, after introducing renovation 1. Introduction scenarios, the error value increased up to 59.5% (depending on the weather and renovation scenarios combination considered). The value of slope coefficient increased on average within the range of 3.8% up to 8% per decade, that corresponds to the As the end of number 2015 Paris Climate Conference, countries achieved mutual agreement in keeping rise of decrease in the of heating hours of 22-139h178 during the heating seasona(depending on the combination of the weather and Reducing carbonintercept emissions has therefore become a universal targetonon global warming temperature below 2oC. renovation scenarios considered). On the other hand, function increased for 7.8-12.7% per decade (depending the lightening natural calamities. The building was the onefunction of the parameters main sources of scenarios the carbon emissions coupled scenarios). The values suggested could environment be used to modify for the considered, and improve the accuracy of heat demand estimations. © 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the Scientific Committee of The 15th International Symposium on District Heating and * Corresponding author. Tel.: +086-574-88189839; fax: +086-574-88180188. Cooling. E-mail address: [email protected]

Keywords: Heat demand; Forecast; Climate change 1876-6102 © 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the 9th International Conference on Applied Energy.

1876-6102 © 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the Scientific Committee of The 15th International Symposium on District Heating and Cooling.

1876-6102 © 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the 9th International Conference on Applied Energy. 10.1016/j.egypro.2017.12.572

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Huizhong Luo et al. / Energy Procedia 142 (2017) 1835–1841 Huizhong Luo et al./ Energy Procedia 00 (2017) 000–000

because of its great amount of energy consumption [1]. It was reported that 31% of the energy consumption worldwide resulted from the building sector and the residential sector accounted for over 50% [2]. It was also estimated that the building consumption was responsible for 27.6% of the total energy consumption of mainland China in 1998 and this sector was considered to be a significant part of energy usage in the future [3]. According to Residential Energy Consumption Survey [4] by U.S. Energy Information Administration, space heating and electricity were two significant portions which have been 41.5% and 34.6% respectively of the total energy usage as shown in Fig.1. In order to diminish the overall energy consumption, passive technique was designed as an approach for achieving building energy efficiency. Previous study indicated that the building integrated with Passive Design Element (PDE) was able to provide more comfortable and healthier living by saving at least 50% energy consumption, and reducing 65% carbon emissions compared to regular house [5].

Figure 1. Energy consumption of U.S. home in 1993 and 2009 (Administration, 2009)

It was generally recognized that the low energy residential building could be built in different climate zones worldwide [6]. However, the PDE widely used in different areas varied with the climate conditions. The suitability of six typical passive design criteria for four global climates was summarized and is shown in Table 1. On the other hand, internal gains are greatly affected by the schedule of building occupants. Even though in some published studies internal gains have been considered, the Building Occupants’ Schedule (BOS) in these studies were arbitrarily determined based on the default settings in simulation software. For examples, in the study of residential PH design in Romania [7], Passive House Planning Package (PHPP) was used for energy demand evaluation where default BOS was used. However, it was found that the default values of BOS could be deviated largely from the real behavioural patterns of occupants that had impact on the house energy consumptions [8]. In the previous study [9], the simulations of residential building models were conducted using the software EnergyPlus, where the building information as well as the default settings in EnergyPlus about schedules of occupancy and equipment were involved. Mihai et al. [10] also only analyzed energy performance of a passive house considering the effect of BOS with software default values. The schedules of lighting and appliances were also reflected by real BOS, affecting the internal heat gains calculation. Without considering real BOS, inaccurate estimation of energy consumption and unacceptable indoor thermal comfort could be expected. In order to fill this research gap, this paper was to study the applicability of typical PDE (Insulation) by considering internal heat gains based on the real BOS including occupant, lighting and cooking. To succeed it, a simulation study on low energy building was performed by using IES VE which has been



Huizhong Luo et al. / Energy Procedia 142 (2017) 1835–1841 Huizhong Luo et al./ Energy Procedia 00 (2017) 000–000

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proved to be verified [11]. A model of a residential building was developed on IES VE. Applicability of the most widely applied PDE, i.e., insulation, was evaluated in different climate zones in China, when considering real BOS which have been published [12]. The simulation results should be useful in determining the real applicability of the above PDE in China. Table 1.Suitability of six criteria for different climates Criteria

PDEs

Marine

Cold and Very Cold

Mixed-Dry and Hot-Dry

Mixed-Humid and Hot-Humid

Location













compactness ratio





shape factor









Solar shading





Green roof





Night cooling



Orientation Cite

Envelope

Passive heating

Passive cooling

Ventilation

Thermal storage

Building shape

√ √



Envelope insulation



Window orientation



WWR Air tightness



Facing south window



Insulation



Sun room



Cross ventilation







Stack ventilation







Night cooling



Thermal mass









PCM Trombe wall



2. Simulation method In this paper, IES VE software was selected to build simulation model on it. Real Building Occupants’ Schedule (BOS) was also considered and imported into the model for evaluating the applicability of PDE of insulation. Description of model The model was built using IES VE, which was recognized as an advanced 3D performance analysis software for designing energy efficient building. As shown in Fig.2, the floor plan of the model was an 8m×8m square and the height was set to be 3.3m, and the WWR was 0.32. The building envelope material was concrete integrated with polystyrene, which was one of the most widely used insulation materials for low energy buildings. All the glazing was triple-glazing with air cavity. Table 2 shows the details of materials used in the model and Table 3 shows all the settings of room conditions of the model.

Huizhong Luo et al. / Energy Procedia 142 (2017) 1835–1841 Huizhong Luo et al./ Energy Procedia 00 (2017) 000–000

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Figure 2. IES VE model Table 2. Building Envelope Materials Envelope

External Wall

Materials

Thickness (mm)

Polystyrene

300.0

Plasterboard

6.0

Waterproof coating

4.0

Concrete (Dense)

200.0

Concrete (Dense)

50.0

Waterproof coating

3.0

Plasterboard

15.0

Polystyrene

300.0

Roof

Waterproof coating

3.0

Concrete (Dense)

20.0

Timber flooring

12

Foam

5

Concrete (Dense)

120

Floor

Plasterboard

6

Polystyrene

300

Waterproof coating

3

Concrete (Dense)

100

Glazing

Clear float

6

Cavity

12

Clear float

6

Cavity

12

Clear float

6

U-values (W/m2k)

0.0966

0.0936

0.0845

2.1208

Table 3. Room condition settings Parameters

Values

Heating temperature

18 CO

Humidity range

40-70%

Lighting gain

0.588 W/m2

Occupant gain

90 W/Person

Cooking gain

4.3 W/m2

Infiltration

1.0 h-1

Fresh air supply

8.33 l/s/p

Application of BOS To ensure the reliability of the numerical model, the real family daily profile including occupancy, lighting, cooking and air conditioning was used to set the schedules that influenced the internal heat gains of the model. The



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values were obtained by a questionnaire survey and a detailed interview of 73 families in China [12]. All the investigated families were in typical family size from different residential communities and selected by random sampling. The specific behavioural patterns are shown in Fig.3. The following BOS would be imported to the settings of internal heat gain schedules.

Figure 3. Behavioural patterns

3. Results and discussions Four parameters were used in simulation for evaluating the applicability of each PDE in different climate zones. The first two parameters were the mean air temperature (MAT) without AC and hour percentage (HP) over 18℃; the second two parameters were MAT with AC and heating demand. The first two parameters were used to assess the direct impacts on indoor environment and the second two parameters were used to analyse the influence of PDE in the real-used situation. Fig.4 indicates the simulation results of the four parameters. As shown in Fig.4(a), the MAT without AC of the house with insulation slightly decreased compared to that for the situation without insulation. Fig.4(b) indicates the similar downtrend of the HP over 18℃ after integrating the

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insulation. For each climate zones, similar variation profile of MAT was found and it could be explained with the fact that the outside radiation was blocked by the insulation. It was proved by a previous study conducted by Marry and James [13]. However, MAT with AC under the situation of insulation application was higher than that for noninsulation application. Table 4 shows the annual average MAT for both insulation and non-insulation situations in cities. It can be seen that difference between the MAT for insulation and that for non-insulation is the biggest identifying that the effect of insulation is the largest as the Beijing compared to the other two cities. In Guangzhou, the MAT is even lower when insulation is used because that the AC is not operated mostly in winter in Guangzhou. Table 4 also indicates the simulation results of annual heat demand and HP over 18oC in different cities. Apparent decreasing and increasing trends were found for annual heat demand and HP over 18 oC, respectively. This table also shows that the decrease of heating demand when insulation was applied was small (less than 0.02MWh). However, when considering applying insulation into a large number of buildings, the decrease of energy consumption for heating is very considerable.

Figure 4. Four parameters result of Beijing Table 4. Four parameter values of each city Locations

Parameters MAT without AC (oC) o

Beijing

Shanghai

Hour Percentage over 18 C o

Without insulation

Insulation

Annual

Annual

7.8

7.4

9.60%

8.90%

MAT with AC ( C)

14.1

14.8

Heating Demand (MWh)

4.7326

4.7217

MAT without AC (oC)

13

12.8

Hour Percentage over 18

21.60%

22%

o

MAT with AC ( C)

16.6

16.9

Heating Demand (MWh)

2.6988

2.6787



Huizhong al. / Energy Procedia 142 000–000 (2017) 1835–1841 Huizhong Luo etLuo al./etEnergy Procedia 00 (2017)

Guangzhou

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MAT without AC (oC)

21.2

21

Hour Percentage over 18

71.80%

73.70%

MAT with AC (oC)

21.7

21.5

Heating Demand (MWh)

0.3729

0.335

4. Conclusions In this paper, we analyzed the applicability of the insulation for three typical climate zones in China. The practical behaviour patterns from Chinese survey [12] were utilized in the internal gain schedule settings. Based on the simulation results from IES VE, the insulation could definitely decrease the heating demand in winter while this effect differed from locations due to the climate conditions. The simulation results indicate the complexity of using insulation as the MAT without AC is lower than that with AC in winter. Therefore, the optimization of insulation application should be conducted for both energy saving and indoor thermal comfort. References [1] Ali, M. (2008). “Energy Efficient Architecture and Building System to Address Global Warming.” Leadership and Management in Engineering 8(3): 113-123. [2] Lee, W. L. and J. Burnett (2008). “Benchmarking energy use assessment of HK-BEAM, BREEAM and LEED.” Building and Environment 43(11):1882-1891. [3] S, L. (2002). “Current situation and progress of energy efficiency design standards in buildings in China.” Refrigeration Air Conditioning Electric Power Mach (23):1-6 [4] Administration, U. S. E. I (2009). Residential Energy Consumption Survey (RECS). [5] Audenaert, A., et al. (2008). “Economic analysis of passive houses and low-energy houses compared with standard houses.” Enegy Policy 36(1):47-55. [6] Schnieders, J., et al. (2015). “Passive Houses for different climate zones.” Energy and Buildings 105:71-87. [7] Dan, D., et al. (2016). “Passive house design-An efficient soluation for residential buildings in Romania.” Energy for Sustainable Development 32:99-109. [8] Ridley, L., et al. (2014). “The side by side in use monitored performance of two passive and low carbon Welsh houses.” Energy and Buildings 82:13-26. [9] Rhodes, J. D., et al. (2015). “Using BEopt (EnergyPlus) with energy audits and surveys to predict actual residential energy usage.” Energy and Buildings 86:808-816. [10] Mihai, M., et al. (2017). “Passive house analysis in terms of energy performance.” Energy and Buildings 144:74-86. [11] Nedhal A. Al-Tamimi and Sharifah F. S. Fadzil. (2001). “The potential of shading devices for temperature reduction in high-rise residential buildings in the tropics.” Procedia Engineering 21:273-282. [12] Shuqin. S., et al. (2015). “Definition of occupant behavior in residential buildings and its application to behavior analysis in case studies.” Energy and Buildings 104:1-13. [13] Marry. J and James. B. (2016). “Passive House in Different Climates.” ProQuest Ebook Central. Access: https://ebookcentral.proquest.com/lib/nottingham/detail.action?docID=4513439.