In Guangzhou, a new approach to "more than 12 residential buildings" is being explored, with an emphasis on investing in hot water solutions. On May 8, 2006, it was reported that the city is accelerating its technological advancements, aiming to address challenges such as inadequate separation of high-rise buildings, densely populated areas, and limited access to solar resources through the integration of "solar + air source heat pump" technology.
According to preliminary data, households using the new water heater systems are spending about 3/4 less compared to traditional electric water heaters. The Guangdong Provincial Department of Construction is currently working on drafting guidelines for the design, construction, and acceptance of solar hot water systems in public and residential buildings. This initiative aims to prevent solar installations from being mistakenly classified as illegal constructions. Additionally, they are considering implementing mandatory requirements, urging public buildings like schools, hospitals, and restaurants, as well as 12-storey residential buildings, to install solar-powered water heaters.
However, some residents noticed that buildings above 12 storeys were not included in the list of encouraged solar installations. Experts explained that high-rise buildings face the challenge of "rooftop disputes." For example, an 8-story building with 32 floors could have 256 households, but the rooftop space available for solar collectors may not be enough to serve every household effectively.
To tackle this issue, the Guangzhou City Wall Office is exploring the use of "solar + air-source heat pump" technology. According to initial estimates, the cost per household for this new system is approximately 5,000 yuan, which is comparable to traditional solar water heaters. Compared to electric models, this system can save up to 75% in energy consumption while providing the same amount of hot water.
Currently, several locations in Guangzhou have adopted this new technology, with South Hospital being one of the most successful examples. The air-source heat pump functions similarly to an air conditioner, generating hot water at temperatures up to 60°C. When combined with solar energy systems, it ensures a consistent and sufficient supply of hot water for entire buildings. This innovative approach is seen as a promising solution to the challenges faced by high-rise residential areas in maximizing solar energy usage.
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