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Green architecture strategy for small and medium works

The majority of green certificates appear on projects with high levels of investment, particularly with internationally certified certificates such as LEED, HQE, and domestic such as Lotus. So where are the small and medium works? Where do not apply the whole system of green certificates, architects and homeowners apply only a few green elements should focus on what factor? And the question that perhaps the most common architect from the host: “What will my family and I get when applying green elements in design?”

Over the past 10 years, green buildings have received a growing number of green credentials, including LEED, Lotus, Cerway HQE, Edge, and Certificate. Green building of the Vietnam Environment Association, Green Building Certificate of the Vietnam Architects Association …

The majority of green certificates appear on projects with high levels of investment, particularly with internationally certified certificates such as LEED, HQE, and in the country such as Lotus. So where are the small and medium works? Where do not apply the whole system of green certificates, architects and homeowners apply only a few green elements should focus on what factor? And the question that perhaps the most common architect from the host: “What will my family and I get when applying green elements in design?”

In order to convince medium and small-sized building owners to join the green design scheme (not necessarily a certificate), architects should point out the benefits to the owner. Private for each specific case. Therefore approach to small and medium works will be different works to be able to bring green elements straight into life.

Some architects have gone through the long-term research on microclimates, so that they can clearly understand the issues related to the sustainability of the building and the surrounding environment. This has led to the practice of sustainable design as a natural criterion in their products. The positive feeling and appreciation of the owner about the comfort, the comfort that the building has green elements bring is the greatest gift for the architect, and also the core “essence” to Green elements can spread far and wide in society.

In the context of a scientific paper, it can not simply quote the remarks of homeowners who lived in green buildings. Evidence from scientific data is needed and when the forecasting data matches the actual measurement data, the potential for calculating the design is very large. . From here can open a new direction in the design of houses or small works. For the average project, the cost of energy use will be of further concern because it is both a dwelling house and a rental property. All of these issues will be predicted by metrics rather than empirical predictions as before.

Please introduce some works that integrate green elements in Vietnam

Projects that integrate green elements

1 – Office Combined Housing -The building has been built

Work photos and models of environmental prediction models

This is a work both at the first floor and second floor is used as office. The building was designed with the passive house criterion, which means the house does not use cooling equipment or heating. Architects mainly use local materials, which are available, undergoing little energy-intensive manufacturing.

Structured door systems on the first and second floor

Proper operation of the facility to ensure comfort in the home is also important, so the architect, also the homeowner, knows how to adjust the door system accordingly. With weather conditions. This operation should also be included in the simulation process, as briefly as follows:

A) Doors on the 1st floor: The outside temperature is in the range of 17-33, completely open the air gap
B) 2nd floor door: The upper part of glass, when the outside temperature exceeds 32oC, will pull the screen.
C) Low window ventilation at 2nd floor: Open at 17-30 ° C. When the outside temperature is higher than 30oC and the internal temperature is higher than outside, it will open.
Calculation results

The temperature of the whole year in the living room (red violet) and outside weather (red)
Temperature in the living room and outside temperature, January
Temperature in the living room and outside temperature, July
Temperature in January, the coldest month, the outside can be down to nearly 7oC, the indoor temperature is around 14oCThe temperature in July, the hottest month, the outside temperature is 37oC, the house is about 33oC.

This is the average temperature survey in a room, when examining the temperature distribution details using CFD (gas dynamics calculation) at the hottest time of the year shows that at the door Outside the higher temperatures, the air temperature in the room is only about 30-31oC. The concrete surfaces are quite cool, 28oC. Thus, the actual sensory temperature will be at an average of the two above, and only a small fan is sufficient to ensure comfort in the home.

Detailed distribution of room temperature in CFD
Temperature in the bedroom and outside temperature
Temperature in the bedroom and outside temperature, July
Detailed distribution of room temperature in CFD

Similarly, in the first floor bedroom, the reader can see clearly the higher temperatures distributed mainly on the outside wall and the air layer at the door area, the room temperature is about 29.2 ° C, enough to create Comfortable micro climate with only a small fan.

Advanced housing – Research on the possibility of building zero energy housing in HCMC

This is a high-end, high-end and high-rise residential project that is expected to become a zero enegy project. Initial research results are also very energy-efficient. A few simple solutions initially showed that the building reached the energy level of the passive building (less than 15 kWh / m2.year), resulting in 4.75 kWh / m2.year. Due to other reasons, it is out of the design process that deep research, as well as construction execution has been halted. But in terms of expertise, the design team thinks that implementing private housing up to eight floors with zero energy is not too difficult to do in Vietnam.

In order to reach Net Zero Energy’s goal, an appropriate strategy for the design phase is needed, the strategies outlined initially include the following:

– The thermal delay of heavy wall blocks is utilized to cool the daytime heat

– Consider using geothermal in case the heat mass and insulation do not meet the needs of comfort. The air entering the house will be led underground for heat exchange before entering the house

– Low-g glass window, sound insulation: The works in Vietnam mainly use low-g glass low level, difficult to ensure comfort, only low-e glass new high thermal barrier blocking but still Let more light see through.

Automatic shutdown and sunshade: Intelligent control components will be programmed based on optimized results when simulating energy with different operating scenarios.

– Wind power generation from Maglev equipment: The new generation wind turbine equipment using magnetic spindle shaft should operate with very high efficiency due to almost no rotation axis friction.

– Solar Cell System: Make the most of solar energy and the extremely high number of sunshine hours in HCMC to create electricity, which can be combined with a navigation system.

– Advanced lighting system: Use high quality LED system to illuminate. This system combines with intelligent sensors and controls to optimize the lighting, minimizing the use of electricity

– Ceiling fan automatic control: simple solution, but high efficiency to ensure the convenience of use

– Small air-conditioning system with high efficiency, combined with hot water heater

Model of forecasting heat and energy
From the early research with different types of insulation, combined with the heat mass showed that the interior temperature (with non-adjustable setting) had a very clear adjustment.

Temperature at 6th floor, bedroom The library at 6th floor has a clear temperature change when utilizing insulation and heat mass. When not insulated as conventional construction, the highest temperature in the room is 34.8 C, in turn applying type 1 and 2 in the calculation, the temperature changes to 33 and 30.7oC respectively. Type 2 is heat-insulating but at the same time utilizing thermal mass. Further calculations by CFD show that the room air temperature falls to about 29 ° C

Temperature at the 3rd floor, library
CFD Survey Room Libraries
On the third floor, the library has the highest temperature in the year, dropping from 36.2 to 32.2oC, the CFD survey shows that the air temperature falls to 31.5oCThe correlation between energy use and renewable energy potential is shown in the figure below, which has a power consumption of about 4.75 kWh / m2. Years are low enough for further study to reach zero. Energy

Correlation of energy use
Potential for renewable energy when installing PV and wind turbines
ConcludeWith large projects, office buildings, hotels, hospitals … operating costs will be large amount of money, so when the consultant calculates this issue is usually received proper attention and the head Private investment considerations are greater for energy saving practices.

For small and medium housing, building green certificates is not a concern for homeowners due to low electricity prices in Vietnam, investment in renewable energy and reduced design. Energy often has a very long payback period. Therefore, it is difficult for designers to design energy saving projects to reduce the amount of 500,000 dong or even 2,000,000 dong per month. However, back to the original question, what is the benefit of a homeowner when designing a building with green elements: Thermal comfort.

The fact that a building with no insulation and good insulation reduces the temperature from 35 ° C to below 30 ° C at the hottest time of the year will make the value of the building soar, but it is not easy to value this value. Only those who have actually lived, experienced these works can understand its value.

It is not natural for the Vietnamese to love the French colonial houses designed and built in colonial Indochina. But how many people experience the feeling of living in it, the feeling of “cool” in the house when the heat outside “fire” always impressed those who have tried. It is quite different from the feeling of using air conditioning in the home with multiple glass doors with thin walls. This feeling can only be achieved when the interior walls of the building are cool enough, the radiant heat radiates from the skin surface to the wall surface. Unfortunately, the design of the French-style works in Indochina just stopped at mimicking the form, the largest value is the thermal comfort is much more difficult. This happens for many reasons, the first cause is due to high land prices, it is difficult to build walls as thick as 600mm or 800mm as before … With new technology and technology, reducing the thickness but ensure Cooling of the wall surface is feasible, as in the case of the 6th floor bedroom of example 2 shows that at the hottest time of the year room temperature drops from 34.8 to 30.2 ° C, detailed calculations with CFD show that only 29oC in the house.

The more developed a society is, the more human needs are, the design of housing that accompanies green elements can only be achieved by bringing the home owner’s life first, thereby reducing it. Use energy for the family. Every single day, every architect contributes a little bit on a large scale, contributing to reducing CO2 emissions and reducing the need to build a nationally-owned power plant that can keep the commitment. With international emissions reductions, the energy supply of housing in Vietnam accounts for 90% of the energy sector’s output.

Tran Thanh Vu

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