How much more does it cost to make a building net zero carbon?


The technical strategies for building zero carbon buildings are listed above

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We all ask, how much more does it cost to build zero carbon buildings than traditional buildings? Today, I shared some topics and cases done by the British

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Please come and understand one or two

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     After these studies, foreign countries have compiled some guidelines for building zero carbon buildings

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So what is the impact on costs?     In order to calculate the impact on costs, the team considered current market trends, such as investors through the climate related financial disclosure task force, stranded asset risk, enterprise ESG drivers, and increasing occupier interest in net zero

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These goals include specific and operational carbon

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It is summarized in the following table: baseline – business as usual, the ambitious 2030 target office in 2025 operates energy (kwh per square meter per year) 225 (RIBA) 90 £ 70 (UK government) office early carbon content (life cycle assessment module, 1kg carbon dioxide equivalent per square meter) 1000 (leti) 600 (leti *) 350 (leti) residential operating energy (kwh per square meter per year) 146 (RIBA) 70 (RIBA) 35 (RIBA) pre embedded carbon life cycle assessment module 800 (leti) 500 (leti *) 300 (leti) * these goals are based on leti’s “best practices in 2020” goal, because there is no leti goal consistent with 2025

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2

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However, due to the increase in the depth of the beam, two floors had to be demolished to maintain the overall building height, which once again affected the value( 2) In order to reduce heat loss and cooling demand, the number of glass windows was reduced from 51% to 29% by reducing the size of bedroom windows and removing bedroom balconies

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Similarly, in the apartment building (1), replacing the concrete structure of the tower with wood frame (beam, cover plate and column) will help to reduce the total carbon emission in the early stage by 21%

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In addition, outsourcing servers for computers has reduced information technology energy use by 78%, but of course these emissions still exist and must be offset

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The measures taken can achieve the grand goal of 2030 through the following measures: 1

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However, larger wooden beams and columns do result in the loss of one floor to maintain the same building height, which will change the value of the building( 2) By slightly relaxing the internal comfort conditions of office personnel, the heating and cooling demand may be halved

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In the ambitious 2030 scenario, about half of the final energy demand comes from unregulated loads

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Photo by Chris gray in unsplash     What is the practical significance of realizing the new net zero building? How to design new buildings to achieve the net zero performance goal, and what impact does this have on the cost?    These are the questions that the researchers of the British Green Building Council set out to answer, and the strategies based on two real buildings that need to be discussed in the design stage: a residential area and an office building

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It has just started in China and there are some studies abroad

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    Julie of GBCA University in the UK said: “it reminds us once again that in the process of pursuing net zero carbon results, more far sighted decision-making and bold industry leaders must go hand in hand.” Irigoyan said

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Result: some net zero goals cannot be achieved because they require radical changes to the original architectural design

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Cost change of residential buildings in the ambitious scheme (/ m2 total internal area) cost change of office buildings in the vision of zero carbon system (gross internal area / m2)     These additional costs may be offset by increased rents, shorter lease expiration periods, lower offset costs and lower operating / life cycle costs

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     The project case is based on the same building that has been approved by the planning (the overall volume, external volume and site conditions remain unchanged), and changes some other design parameters (such as structure, HVAC system, tenant requirements, etc.) to achieve or close to the net zero performance goal

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Compared with the benchmark, the office building (1) uses all wood structure to replace the steel and concrete in the office structure, and demolishes the concrete basement, reducing the early carbon emission by 39%

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     They concluded that the net zero target for 2030 is much higher and that the market is not ready to achieve these goals on a large scale

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  According to the chief executive of the British geological survey, “this study provides long-awaited evidence that building according to the energy and carbon efficiency standards required by 2025 does not have to cost a lot of money, and is likely to be offset by the improvement of building value.” So the question is, how to set this net zero goal? They are based on the following standard systems: the Royal Institute of architects 2030 climate challenge London energy transition plan (leti) climate emergency design guide, and the British Green Building Council net zero carbon building: a framework definition and office energy performance objectives

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     They calculated that the additional costs of offices were 6.2% (2025 medium-term target) and 8-17% (2030 high-level target) and 3.5% and 5.3% of housing, respectively

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Three layers of glass and lower wall U values also help( 3) Using air source heat pump instead of gas boiler greatly reduces the operation energy consumption

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The construction field has begun to explore the implementation route of zero carbon buildings

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     The goal of carbon neutralization is an important strategy to deal with climate problems

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This means passive cooling with openable windows in spring and autumn( 3) Finally, without ceiling, the embedded carbon is reduced by 13%

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The researchers studied the basic design and developed two alternatives for each design, one aimed at achieving the net zero performance goal in 2025 and the other aimed at achieving the more challenging goal in 2030

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     In order to solve this problem, they believe that the government needs to ensure certainty through a long-term and consistent regulatory path, and constantly tighten standards, so as to stimulate supply chain investment and innovation, so as to reduce costs

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