[2]
1,Energy consumption analysis of building structure itself Nanchang subtropical humid monsoon climate. The climate is characterized by the solar radiation intensity, the height of the sun, the average monthly outdoor drying temperature is generally higher than 15℃. General building energy saving from the following three points: ventilation, sunshade and heat insulation. As a result of Nanchang climate and different northern, indoor and outdoor temperature difference is not so obvious as the north, the energy into the interior of the main way is through direct sunlight, so this paper will be focused on ventilation, shading and other maintenance of structural energy saving principle analysis.
DOI: 10.1016/j.enbuild.2017.04.045
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[2]
2.1,Visible light transmittance and the heat of the sun 's contradiction If the color of glass deep, obviously, so the heat into the room will be reduced, but at the same time we must meet appropriate indoor fluorescent lighting. In traditional glass on this is a contradiction, but the current solar control film to satisfy this requirement, keep it in into the indoor heat for only 39% cases, visible light transmittance reaches 65%.
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[2]
2.2,Visible light transmittance and reflectance Usually, the high transmittance, reflectance is low. High reflectance, transmittance is low. For example: 8% transmissivity, reflectivity is usually in the 3742% between. However, solar control glass Low-E successfully solve this contradiction 65%, transmissivity, reflectivity is 7%, indoor have a large number of light can enter, forming a comfortable environment, low reflectivity, on the outside does not result in strong light reflection of feeling, conform to requirements. From the above analysis, it is not difficult to see that the sun control Low-E glass is the best choice of apartments, energy optimization analysis simulation using three glass scheme, as shown in Table 1-3: Table 1-3 Coefficient of heat-engineering for different glass Glass type
The common heat absorbing glass
Heat reflecting coating glass
Low-E glass
Heat transfer coefficientK (W/m2.℃)
5.75
5.72
1.70
Shading coefficientSC
0.85
0.55
0.31
Through the construction of ventilation mode setting, available in three sizes, three sun visor for thermal parameters of glass based on architecture standards at the unit area air conditioning load were analyzed, the results in table 1-4: Table1-4 Airconditional load of unit area of standardal floor Window glass type
Standard layer of air conditioning load（W/m2）
The measure of area (m2)
The hottest average
Annual maximum
The annual cumulative
Annual average
The common heat absorbing glass c=0.85
Apartment layout direction
To the West
112.64
91.9
309.1
6.92E+05
79.0
To the North
59.59
47.5
83.6
1.74E+05
19.9
To the South
85.60
57.5
182.5
3.67E+05
41.8
Middle
131.16
42.0
133.8
2.08E+05
23.8
To the East
169.84
61.2
180.9
3.22E+05
36.8
Heat reflecting coated glassSc=0.55
Apartment layout direction
To the West
112.64
66.9
242.1
4.38E+05
50.0
To the North
59.59
41.4
73.3
1.45E+05
16.6
To the South
85.60
42.0
99.0
2.07E+05
23.6
Middle
131.16
32.6
74.5
1.34E+05
15.3
To the East
169.84
47.4
131.5
2.16E+05
24.6
LOW-E hollow glass Sc=0.31
Apartment layout direction
To the West
112.64
49.2
150.8
2.64E+05
30.1
To the North
59.59
37.2
65.6
1.27E+05
14.5
To the South
85.60
35.6
69.1
1.49E+05
17.1
Middle
131.16
28.2
50.1
1.05E+05
12.0
To the East
169.84
36.6
85.1
1.47E+05
16.8
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[2]
3,Fixed investment Different kind of glass each plan investment see table 1-5 Table 1-5 Fixed-investment for each scheme Glass type
6cWhite glass
6CTS140 Coated glass
6CEB12+12A+6CHollow glass
Glass unit（yuan/m2）
70
135
320
Initial investment （Million yuan）
61
110
260 3,Energy saving scheme selection
DOI: 10.1016/0140-9883(87)90033-8
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[3]
1,Energy saving transformation before and after the changes in investment Scheme
Energy saving
glass
Air conditioning system
Total
The original plan
Common white glass + split air-conditioning + gas water heater
61 Million yuan
292 Million yuan
353 Million yuan
This scheme
Low-E hollow glass + water ring air conditioning + heat pump water heater
260 Million yuan
437 Million yuan
697 Million yuan
DOI: 10.1787/086845666832
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[3]
2,Energy saving transformation and the annual operation cost changes Scheme
Energy saving
Air conditioning system
Total
The original plan
Common white glass + split air-conditioning + gas water heater
240 Million yuan
240Million yuan
This scheme
Low-E hollow glass + water ring air conditioning + heat pump water heater
100 Million yuan
100Million yuan
DOI: 10.2172/201744
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[3]
3,Comprehensive benefit Compared with the original scheme is now beginning to invest an additional 344 Million yuan, but the annual operating cost savings of 140 Million yuan, with static analysis method, less than 3 years can recover the additional initial investment, 3 years after its energy saving effect highlights. 4,Conclusion After the plan adjustment, which makes the apartment operation energy consumption decreased significantly, from a long-term building life cycle perspective to observe, saving the cost is huge, and reduce energy consumption for social contribution. At present our country electric power generally in short, according to the forecast for next year's gap larger, long-term since people form a habit of thinking, is the country's GDP growth, will inevitably bring about the primary energy consumption growth. In fact, if from the perspective of energy saving to alleviate this shortage may be better. In the field of real estate, if at the beginning of design with the ecological concept, from the building life cycle perspective, in the design of the ecological energy saving throughout, let the building has good ventilation, and the integration of the sunshade structure, good thermal insulation effect of retaining structure, reasonable equipment system, these measures will certainly to building energy saving play a positive role.
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