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Dr. Xu Yunsheng revealed that the “Zhongguancun Software Parkâ€, the first geothermal energy utilization teacher project in Beijing, was put into heating in the winter of 2004. The same set of equipment only needs to be converted to a valve, and it will use geothermal heat to send it to the software park in June 2005. Got the cold wind.
"Cold storage" and "hot library" are at your feet
"In Beijing, where the four seasons are distinct, the annual average temperature is around 16 °C, while the temperature difference between winter and summer is as high as 40 degrees." Dr. Xu Yunsheng told reporters that people who experience the heat and cold on the ground may find it difficult to think that there is a constant temperature layer around 5 meters below our feet, and a huge cold storage formed by heat at 15 °C-18 °C in the temperature layer. And the heat store, if you can use this heat, as the energy to provide us with a comfortable living temperature, the current building can completely bid farewell to the "air conditioning and heating era."
The principle of the pump produces a "heat pump"
"Everyone knows the reason that water flows down. The temperature is also transmitted like water. It flows from high to low. Putting a cup of hot water and a cup of cold water together, the temperature in the hot water will flow to the cold water, and finally Turned into two cups of warm water." Dr. Xu told reporters, "But if you want to extract water from a low point to a high place, you must use a pump to help. The same is true for heat. In winter, you need to extract the temperature around 15 °C underground. To the ground with a temperature below zero, a heat pump is needed.†Dr. Xu explained that the heat pump is a device that can exchange air and air for the ground at a constant temperature throughout the year.
75% of the energy required comes from the underground
Dr. Xu said that unlike conventional air conditioning and heating systems, ground source heat pumps no longer need to “create†heat or cooling indoors. It's just "shifting" energy between the earth and the interior, using very little power to keep the room at a temperature level you need. In the winter, a small amount of electricity, several times the amount of energy in the soil or rock into the room, then, 1 kilowatt of electricity to provide you with 4 kilowatts -5 kilowatts of heat is very easy. In the summer, the process is just the opposite. A lot of indoor heat is easily transferred to the soil, and the indoors get cool air, and the energy obtained underground will be used in winter.
Investing in ordinary residences for 3 years
“If a private villa installs this system and needs about 10 million yuan, it seems that the cost is huge, but it can be returned in three years.†Dr. Xu calculated the account for the reporter and installed a traditional air conditioner for a villa. About 60,000 yuan is needed, and the huge electricity bill caused by the air-conditioning every summer is not counted. The heating fee for public heating in the winter will cost several thousand yuan, and it will cost you thousands of dollars every year. In three years, the cost of adding and installing the ground source heat pump is almost the same. "Using this heat pump technology with a life span of about 50 years is not only environmentally friendly, but also saves a lot of money in a few years."
Using heat pump technology, Beijing Zhongguancun pumped underground energy to blow cold air
Friends who stay in civil air defense projects or underground caves will certainly sigh at the warm winter and cool summer. This underground “energy†buried 5 meters deep in Beijing and maintaining a temperature around 15 °C is often overlooked. Now Dr. Xu Yunsheng, the deputy dean of the School of Environment and Energy Technology at Missouri Columbia University, has brought heating and air-conditioning technology to the ground to extract underground energy to the ground.