Energy Demo Building in Tsinghua University was completed in January, 2005. It is a scientific research program of Beijing City Science Committee. As an “early-stage demonstration project” of 2008 Olympics Architechture, it aims to embody the idea of “High-technology”,“Green” and “Human-centeredness” of Olympics Architecture. Meanwhile, the Energy Demo Building is also a technology integration platform of national tackling project of science and technology named “Research on Key Technology of Green Architecture”, demonstrating and testing various advanced architectural forms with low energy consumption, ecology and humanism as well as sophisticated products, providing a solid basic for both theoretical and practical research on building science and technology. The Energy Demo Building in Tsinghua University uses a temperature and humidity independent control air-conditioning system and adopts liquid desiccant fresh air units for both fresh air loads and indoor latent heat load. There are four liquid desiccant fresh air units manufactured by SinoRefine Air Conditioning Technology Company in the demo building, including two heat-pump driven liquid desiccant fresh air units, one water-cooled liquid desiccant fresh air unit and one evaporative cooling liquid desiccant fresh air units.
In the demonstration building, floor 1 and 4 used liquid desiccant fresh air unit with heat and cold source, controlling indoor environmental parameters with indoor sensible heat terminal s Performance test shows that the system runs normally with COP of 5 or above; the air supply temperature is18～22℃,humidity ratio is7.5～8.5g/kg. The indoor condition can be stabled around 25～26℃ with humidity ratio of 11～12g/kg, which can satisfy the requirement of indoor air-conditioning.
Energy Demo Building in Tsinghua University first uses stepped utilization of energy in the world. The waste heat from the smoke and flue gas generated by electricity generator drives the absorption heat pump to generate 18℃cold water which is sent into the indoor terminals to take away the sensible heat; waste heat in flue gas and engine jacket after the electricity generation can generate 60~75℃ hot water, which drives the regenerator. The generated condensed solution is sent into the liquid desiccant fresh air units in second and third floor to let the fresh air blow through the total heat recovery module ; after that, the liquid desiccant unit with strong solution will generate enough dry fresh air, which is sent into the indoor environment, taking away the humidity load. After the preliminary test, the air flow sent by the liquid desiccant fresh air unit in summer varies from 3000 to 3500 cubic meters per hour, which basically meets the designed requirement. the air amount can be controlled by frequency conversion. The humidity ratio of fresh air varies between 7.5～8.5 g/kg, being able to meet the requirement of taking away indoor humidity load.
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