"In the past, our hotel used biological medium boiler for heating, but the operation and maintenance cost was too high, and the heating effect became worse after using for a long time. However, since the power supply company helped us change into air energy hot water boiler, the cost has been saved by 50000 yuan in three months. It is estimated that 200000 yuan can be saved in one year, and no pollutants are discharged. It is really saving money and energy!" General Manager of Linglong Wang Hotel in Guidong, Hunan Province is very satisfied with the effect of the power substitution project implemented by the hotel's HVAC and hot water system.

Guidong Linglong Wang International Hotel is a five-star standard tea culture themed boutique hotel with 209 guest rooms. With the increase of the service life of the biological medium boiler, the low efficiency of the equipment, the high cost of operation and maintenance, and the non-compliance with the environmental protection requirements have become the problems perplexing the hotel. For this reason, State Grid Chenzhou power supply company took the initiative to provide door-to-door service for the hotel free of charge. It was found that hot water production and central air-conditioning operation were the main energy consumption costs of the hotel. After the operation comparison and analysis with other energy sources such as natural gas, the solution of air energy hot water boiler for hot water and heating was developed for customers.

The staff of the power supply company introduced to the hotel: "this scheme takes clean energy power as the driving force, absorbs the heat of renewable energy such as sunlight, air and steam, and provides thermal energy for the hotel. The whole process does not need to be burned and no pollution is discharged. It meets the requirements of environmental protection and safety. It can provide you with 55 tons of heating water every day, which can maintain a constant temperature of 55 ℃. In addition, we can provide you with five years of energy custody service free of charge... " The hotel side deeply felt the enthusiasm of the power supply company and decided to choose the scheme.

In April 2020, State Grid Chenzhou power supply company facilitated State Grid Chenzhou Comprehensive Energy Service Co., Ltd. (Investor) to sign a "energy management contract" cooperation agreement with Linglong Wang Hotel in Guidong, confirming the implementation of the energy-saving transformation project of air energy hot water boiler, and the comprehensive energy company will undertake the operation and maintenance work and electricity expenses for the hotel in the first five years.

In June 2020, the project will be put into operation smoothly. The project can replace 500000 kwh of electricity for hotels every year. The energy cost is about 45 percent of the gas and 67 percent of the biological medium. The operation cost is saved by nearly 200000 yuan. The annual emission of carbon dioxide is 520.07 tons, sulfur dioxide is 15.64 tons, and nitrogen oxide is 7.82 tons. The cost saving, safety and environmental protection effect is remarkable.