Solution
27
2024
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12
46,000 square meters of centralized heating project in Jiaxiang County, Shandong Province
In most areas, as March approaches, the heating season is drawing to a close. During this heating season, the operation and energy consumption of air heating have been, I believe, the focus of market attention. Below, we will focus on analyzing a district heating renovation case in Jining City, Shandong Province. The project was launched in October 2019 and officially put into operation on November 26. As of February 29, 2020, it has been in operation for 95 days, with a total electricity consumption of 974,510 kWh.
The heating season in most areas is drawing to a close with the arrival of March. During this heating season, the operation and energy consumption of air heating have been, I believe, the focus of market attention. Below, we will focus on analyzing a case of centralized heating renovation in Jining City, Shandong Province. The project was launched in October 2019 and officially put into operation on November 26. As of February 29, 2020, it has been in operation for 95 days, with a total electricity consumption of 974,510 kWh.
I. Project Overview
1. Construction Overview
This project is located in Huanggang Village, Jiaxiang County, Jining City, Shandong Province, a relatively old community. The building area of this region reaches more than 46,000 square meters, with a total of 13 buildings, each with 6 floors. The height of the 1st floor is 4 meters, used as storage space for residents; the height of floors 2 to 6 is 3 meters, serving as residential space. The buildings lack insulation, the surrounding environment is relatively open, resulting in significant heat dissipation, and the brick wall structure is a two-four wall structure.
2. Climate
The average temperature of the coldest month last winter in Jining City was 0℃, with the lowest temperature being -15℃. This case is located in an open area with strong winds, so the temperature will be slightly lower. The current heating period has an outdoor temperature range of 1℃~5℃.
3. System Overview
This project is equipped with 17 sets of 50P Midea low-temperature air-source heat pump units. When the outlet water temperature of a single unit is 50℃ and the return water temperature is 45℃, the heating capacity can reach 104kW.
Considering the cost and time of renovation, and after comprehensive consideration of various opinions, it was decided to use the original heating method—radiant floor heating—but to replace the aging pipelines and the original boiler heating main pipelines, and redesign the size and direction of the underground main pipelines.
The system controls the end water temperature through a controller and pump station equipment, realizing on-demand heat supply, thus better avoiding waste, reducing system energy consumption, and achieving energy-saving goals.
II. Operational Overview
In mid-November, the project was completed and debugged, and officially put into operation on November 26. During operation, the ambient temperature was 1℃~5℃, the unit return water temperature was 40℃~45℃ (40℃ in cold weather, adjusted to 45℃ in warmer weather), and the indoor temperature was basically maintained above 20℃. As of February 29, the system has been running for a total of 95 days, with a total electricity consumption of 974,510 kWh. The average daily electricity consumption was 10,258 kWh, and the average daily electricity consumption per square meter was 0.223 kWh.
III. Summary
1. From the data, as of February 29, the total operating time in November was 5 days, with a total power consumption of 51,545 kWh, an average daily power consumption of 10,309 kWh, and an average daily power consumption per square meter of 0.222 kWh; the total operating time in December was 31 days, with a total power consumption of 325,686 kWh, an average daily power consumption of 10,506 kWh, and an average daily power consumption per square meter of 0.227 kWh; the total operating time in January was 31 days, with a total power consumption of 97,510 kWh, an average daily power consumption of 10,258 kWh, and an average daily power consumption per square meter of 0.223 kWh. In January, a total of 31 days of operation resulted in a total electricity consumption of 331,046 kWh, an average daily electricity consumption of 10,679 kWh, and an average daily electricity consumption per square meter of 0.23 kWh; in February, a total of 28 days of operation resulted in a total electricity consumption of 266,233 kWh, an average daily electricity consumption of 9,509 kWh, and an average daily electricity consumption per square meter of 0.205 kWh. It can be seen that the electricity consumption of air-source heating is closely related to the temperature, with the lowest temperature in January resulting in the highest average energy consumption.
2. During operation, the air-source heat pump unit performed well, and the indoor temperature remained stable at approximately 20°C. The average daily electricity consumption was 10,258 kWh. Compared with similar products on the market, the operating energy consumption is significantly lower. It is both environmentally friendly and energy-efficient, and with the trend of coal prohibition, air-source heat pumps are a very suitable choice to replace coal-fired boilers.
Keyword: Full DC Inverter Heat Pump
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