Seawater source heat pump unit heating energy saving and environmental protection

Abstract: In winter, no coal is required for heating, only the seawater source heat pump unit is used to extract the seawater energy, and combined with electric heating, the fresh water can be heated without pollution. In the summer, refrigeration is not freon, and only the seawater can be extracted by circulating the seawater source heat pump unit. Cold wind cooling. The largest seawater-source heat pump room in the country, which uses renewable energy for heating and cooling, is located on an island in Dalian. A few days ago, the reporter embarked on this sea-source heat pump room and uncovered the entire process of converting seawater into heat energy and converting it into cool air.

In the blue sea 56 kilometers away from Dalian, there is a beautiful and clean island of Zizi Island. Walking around this small island with a small area will produce a big question. Except that some small bungalows on the hillside can see smoke, there is no big chimney necessary for the heating boiler room on the island. One building, how to solve the heating problem without a big chimney?

It turned out that this small island had already realized central heating of seawater-source heat pumps in 2007. It can be said that they extended the “big chimney” of heating to the sea. According to Shi Jingxin, party secretary of Zhangzidao town, from 2006, Zhangzidao began investing more than 70 million in succession to build a seawater-source heat pump room on the island, and launched a subsea tunnel to provide continuous seawater energy for the engine room.

Although for many cities in China, the seawater source heat pump is still a technology that makes people “unfamiliar”. This kind of clean energy is also too expensive to enter the homes of ordinary people. However, in Zhangzi Island, the seawater source heat pump has achieved centralized heating and solved the winter heating problem for more than half of the island residents.

According to another report, the 24 seawater source heat pump units hiding in the Mingzhu engine room and the Xinghua engine room in Zhangzidao are not only the largest heat pump units in the country, but also the best seawater source heat pump units in Dalian. They have truly realized the use of thalasia and green water. Environmental protection heating and cooling.

The 24 heating units extracted 300,000 kilowatts of seawater heat into the seawater source heat pump room on Zhangzi Island every day and found that the structure of the machine inside was not complicated. The Dalian Hengheng Technology Development Co., Ltd. (hereinafter referred to as “Heng”) belongs to the Zizi Island Government. Active ") is responsible for the operation and management of the entire computer room. For the entire process of how to extract seawater energy heating and cooling, Heng Yang Deputy Manager Cai Minghui gave a detailed introduction to the reporter.

The entire seawater source heat pump system on the island consists of a subsea tunnel, a sea water pump, a source pool, 24 small sea water pumps, 24 units (heat exchangers), 24 secondary water units, and 24 end circulation pumps.

First, a sea water pump was used to pump the required seawater through a submarine tunnel into a 200-ton seawater pool, and then 24 seawater pumps were used to transfer the seawater in the pool to 24 units in two machine rooms. In the heat exchanger, there are two interlayers in the circular heat exchanger, one layer of recycled freshwater and one layer of circulating seawater. In winter, the seawater temperature is usually 4-5°C higher than the freshwater temperature, and the law of conservation of energy passes through the circulation process. The temperature of fresh water can be heated by seawater by 3°C-5°C.) After seawater energy exchange through the heat exchanger, the temperature drops and flows directly back to the sea through the pipeline. Fresh water after energy substitution and heating flows through the pipeline to the secondary circulation pump unit. Inside, after high-temperature pressurization in the secondary circulation pump, the freshwater temperature again rises to 45-50°C and flows into the end circulation pump to directly heat the residents. The entire seawater source heat pump system in Zhangzidao can accumulate up to 330,000 kilowatts of seawater per day (24 hours).

Refrigeration seawater source refrigeration is far from Freon pollution. In fact, using seawater energy winter heating is only one of the functions of the seawater source heat pump. In the summer, seawater is replaced by seawater instead of freon. Natural air is used for cooling. It is another green function of seawater source heat pump. The trading network, which is known as "seawater air conditioning," has been built and used in Dalian Xinghai Bay, Dayao Bay Port Area, Changhai County, and Dachangshan Dachangshan Island.

Cai Minghui said that the use of seawater-source heat pump cooling in the summer is much simpler and more energy-efficient than in winter heating. Only the sea water pump and the end-circulation pump can be turned on to complete the energy replacement, and the freshwater cooled by seawater can pass through the enterprises, The central air-conditioner air ducts of institutions, schools, etc., transport the natural cool air directly to the offices and away from the Freon pollution. Because this "seawater air conditioning" requires central air conditioning transfer, it has not yet been put into use in ordinary households.

In this regard, Shi Jingxin said that, no matter what, they will insist on the use of seawater source heat pump heating, because this is an important step for them to achieve the goal of building an international ecological island town.