Industrial waste water and domestic sewage turned waste into treasure, replacing fossil energy to become a "new energy" for heating and cooling. On March 26, the reporter learned from the application of the original sewage heat source heat pump technology promotion conference that it was independently developed by Dalian Shuguang Energy-saving Air Conditioning Equipment Factory. The original sewage source heat pump technology has opened up new avenues for building energy conservation and emission reduction in China.

The principle of this system is to use the sewage discharged from the nearby urban sewage pipe network to take heat from it in the winter, and in the summer, the indoor temperature will be discharged and the cold will be taken from it. At present, the technology has been identified by an expert group composed of the Chinese Academy of Architectural Sciences, the Dalian Municipal Construction Committee, and the Dalian Municipal Science and Technology Bureau. It has been identified as “the first in China, internationally advanced, and has significant social and economic benefits.”

The primary sewage mainly includes domestic sewage, industrial wastewater and secondary sewage. Untreated sewage water complex, mixed with a large amount of pollutant discharge. To solve these problems, energy-saving air-conditioning plant Dalian Hoko developed the world's first fully automatic sewage decontamination machines and other equipment, not only the pollutant discharge sewage effectively filter out dirt and debris can be filtered using the heat exchanger The sewage is sent back to the sewage main canal.

According to reports, in terms of energy-saving, untreated sewage systems EER of 4.0 or more, compared with the first large coal-fired boilers to improve energy efficiency 80% or more, energy efficiency is 3-4 times the electrical heating methods than the traditional central air conditioning the system saves 30% -60% of operating costs. For water conservation, due to the untreated sewage pump without cooling towers, water evaporation and drift water is not a problem in summer operation, substantial savings in water consumption, each cooling season 10,000 square meters building can be saving more than 4,000 tons. In terms of environmental protection, the original sewage source heat pump belongs to the recycling of waste heat energy. There is no combustion process, and there is no discharge of solid waste, toxic and harmful gases and soot, which reduces the “greenhouse effect”.

In 2007, Friendship Group Dalian Development Zone Friendship Mall used the original sewage source heat pump air conditioning system to use the sewage from the building's attached sewage pipeline without any treatment as the cold and heat source of the heat pump air conditioning unit. In the winter, the sewage was heated to heat the building. In the summer, the heat pump unit is used to discharge the waste heat from the building into the sewage in the sewage main canal to cool the building. The relevant person in charge of the Friendship Group said that after adopting the system, Friendship Mall saved 338,000 yuan in heating costs in the winter and 200,000 yuan in cooling electricity in the summer.

According to experts, China's urban sewage volume is huge. In 2006, the national sewage discharge totaled 53.7 billion tons, and it is expected to reach 73 billion tons by 2010. If the waste heat from these sewages is recovered by a raw sewage source heat pump, it can solve the problem of winter heating in at least 3 billion square meters of buildings.

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