The thermal operation project of Shengquan Community is located in Weicheng District, Weifang City, Shandong Province. The residential area was built in 2007. The original heating mode was gas boiler. Due to the high operating cost, and the operation of the whole day and time, the heating is discontinuous and the temperature is not up to standard, resulting in poor heating effect and low comfort of residents. This situation needs to be improved urgently.
In order to solve the problem of poor heating effect of the original gas boiler and actively respond to the government's dual carbon goal, Weicheng District decided to replace the original gas boiler heat source and replace it with a clean and environment-friendly air source heat pump unit to achieve centralized heating for Shengquan District. Provide continuous and stable heating with indoor temperature not lower than 18 ℃ in winter.
This project is equipped with 26 Kcalin STS high efficiency air source heat pump units with the model of KLKQ-STS/S-90/24 (I) R3. They will be completed and put into operation in October 2020. The temperature in the heating room in winter is not lower than 18 ℃. At present, they have been operating stably for two heating seasons.
Shengquan Community Thermal Operation Project is located in Weifang, Shandong Province. The building area is 86000 ㎡, the heating area is about 66000 ㎡, and the terminal heating is floor heating.
This design mainly includes relevant national heating, air conditioning and ventilation design standards, as follows:
1．Code for Design of Heating Ventilation and Air Conditioning of Civil Buildings GB50736-2012;
2． Code for Design of Building Water Supply and Drainage (GB50015-2019);
3． Heat Pump Water Heaters for Commercial, Industrial and Similar Purposes (GB/T 21362-2008);
4. Technical Measures for National Civil Building Engineering Design (HVAC power water supply and drainage)
5.Standard for Energy Efficiency Design of Residential Buildings in Severe Cold and Cold Regions (JGJ 26-2010);
6.Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering (GB50243-2016);
7． Relevant specifications and technical standards of other countries.
After checking the outdoor meteorological parameters of the National Code for Design of Heating Ventilation and Air Conditioning of Civil Buildings, the meteorological parameters of Weifang City are as follows:
| Item | Value | |
| Outdoor heating calculation temperature（℃） | -7.0 | winter |
| Outdoor air conditioning calculation temperature（℃） | -9.3 | |
| Calculated relative humidity of outdoor ventilation（%） | 63 | |
| Outdoor average wind speed（m/s） | 3.4 | |
| atmospheric pressure（hPa） | 1022 |
According to the actual investigation and understanding of the site and the thermal insulation of the house, the thermal load is calculated as 32w/m2.
The calculation results are as follows:66000x32w/m2/1000=2112kW
According to the load calculation, the equipment selection is as follows:：
| Serial number | name | Aggregate demand | Unit model | parameter | Quantity (set) | remarks |
| 1 | STS air source heat pump unit | Total heat load2112KW | KLKQ-STS/S-90/24(I)R3 |
Nominal heating capacity:98KW electric power:24KW |
26 | |
| 2 | water circulating pump | KQL200/300-45/4 |
Electric power of circulating pump:45KW Flow:Q=390m³/h Lift:H=24m |
2 | Matched with the unit |
| Serial number | Heating mode in winter | Company | Kcalin STS air source heat pump | Gas boiler | remarks |
| 1 | Type of energy | - | electric energy | Electric energy+gas | |
| 2 | Total heating load | kW | 2112.0 | 2112.0 | |
| 3 | Annual heat consumption | 10000kWh | 444.0 | 444.0 | |
| 4 | Annual energy consumption | 10000kWh | 142.4 | 21.6 | Power consumption |
| 10000Nm3 | / | 46.9 | Gas consumption | ||
| 5 | Annual operating expenses | 10000yuan | 66.9 | 129.7 | |
| 6 | Heating cost per unit area | yuan/㎡ | 16.1 | 31.3 | |
| 7 | Indirect CO2 emissions | tCO2/year | 842.7 | 1019.0 |
1） Energy saving
The operating cost of the original gas-fired boiler heating system is 31.3 yuan/(m2 · heating season) (the natural gas price is 3.2 yuan/m ³）， After the transformation, the operating cost of the air source heat pump heating system is 16.1 yuan/(m2 · heating season) (the electricity price is 0.58 yuan/KWh). Compared with the original system, the annual operating cost is reduced by 15.2 yuan/(m2 · heating season), saving 48.4% of the operating cost.
2）Environmental protection and emission reduction
CO2 emissions are calculated based on the national average carbon emission coefficient of 0.592 kg CO2/kWh per kilowatt hour in 2018, which is 17.3% less than that before transformation. Air pollutant emission: after the transformation, the air pollutant emission at the site where the heat pump heating system is used is zero. The indirect NOx emission is 56.4% less than that of the gas fired boiler before the transformation, and the PM2.5 emission is 9.5% less than that before the transformation.
The practical application of STS air source heat pump unit for two consecutive heating seasons has proved that it has achieved efficient, continuous and stable heating for residents in Shengquan Community of Weifang. The room temperature in winter is up to standard (above 18 ℃), and the operating cost is significantly lower than that of gas boilers. In extremely cold weather, it is not affected by frost, defrosting and shutdown, and the heating effect is good.
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