1. Case name:? district low-carbon heating and cooling project of Nanjing International Service Outsourcing Park
2. Case summary:? this project mainly serves the construction and contract energy management of district cooling and heating project and of Nanjing International Service Outsourcing Park, with the designed total cooling and heating scale of 112.5MW (about 32000RT), which can meet the cooling and heating needs of 1.5~1.8 million-square-meter air conditioning area in the park. The project was rated as the Renewable Energy Building Application Demonstration Project of the Ministry of Construction in 2008, and is the largest building energy conservation and emission reduction demonstration project in Jiangsu Province.
3. Case introduction:
1. Background of the case
Nanjing International Service Outsourcing Park, located in the north of Nanjing Hexi New Town, covering an area of 116 hectares, mainly developing the high-technology industry focusing on software R&D and service outsourcing, is a key construction project in Nanjing City, with a total planning area of 3.8 million square meters. During the development of the park, Nanjing Fasike Energy Technology Development Co., Ltd., a subsidiary of SPIC Jiangsu Electric Power Co., Ltd., which cooperated deeply with the park manager, fully learnt from the successful experience of developed European and American countries in urban regional energy planning, took advantage of the natural advantages of the park’s adjacency to the Yangtze River and combined with the planning pattern of high-density buildings in the park, constructed a large-scale district low-carbon cooling and heating system (hereinafter referred to as DHC). A centralized energy station is set up in the system, which is constructed and put into operation in three phases, synchronized with the development of the park.
2. Detailed introduction of the case
The DHC of Nanjing International Service Outsourcing Park, taking multiple energy-saving technologies including river water source heat pump, ice storage, large temperature difference variable flow as the core, has the characteristics of energy conservation and environment protection, economy, flexibility and green refrigeration.
The river water source heat pump uses the Yangtze River water for refrigeration in summer and absorbs the heat energy from the Yangtze River water for supplying heat to the park in winter, with the designed total cooling and heating scale of 112.5MW (about 32000RT). There will be an energy station and a water intake pumping station in the park, and after the phase III equipment in the energy station is installed and put into use, it can meet the cooling and heating needs of 1.5~1.8 million-square-meter air conditioning area in the park.
The total installed capacity of river water source heat pump system in phase I of energy station is 12600kW (refrigeration), mainly including 3 Trane three-working-condition centrifugal main machines and 3 air conditioning circulating pumps:
(1) 3 Trane three-working-condition centrifugal main machines (CVHG1100) with the voltage level of 6000V.
①Refrigeration condition: refrigerating capacity is 1195RT/4200kW, full-load input power is 767.1kW, COP=5.48, evaporator inlet and outlet water temperature is 12.5/5.5℃, flow is 515 m3/h, condenser inlet and outlet water temperature is 29/37℃, flow is 543 m3/h.
②Heating condition: heating capacity is 4185.7kW, full-load input power is 755.4kW, COP=5.54, evaporator inlet and outlet water temperature is 9/4℃, flow is 570 m3/h, condenser inlet and outlet water temperature is 37/45℃, flow is 449 m3/h.
③Ice storage condition: refrigerating capacity is 765RT/2690.79kW, full-load input power is 590kW, COP=4.56, evaporator inlet and outlet water temperature is -1.07/-5.6℃, flow is 550 570m3/h, condenser inlet and outlet water temperature is 29/32.8℃, flow is 750 m3/h.
Trane main machine and high voltage distribution box in phase I of energy station
(2) 3 air conditioning circulating pumps, brand: Grundfos, model: LF11-80123-158269; flow: 660 m3/h, lift: 20m, motor power: 55kW, AC380V; driving mode: frequency conversion control.
Air conditioning circulating pump in phase I of energy station
The installed capacity of river water source heat pump system in phase II is 32000kW (refrigeration), including 3 Trane centrifugal main machines, 2 York centrifugal main machines and 8 air conditioning circulating pumps:
(1) 3 Trane centrifugal main machines (CVHG1100) with the voltage level of 6000V.
①Refrigeration condition: refrigerating capacity is 1277RT/4490kW, full-load input power is 844kW.
②Heating condition: heating capacity is 4630kW, full-load input power is 857kW.
Trane main machine in phase II of energy station
(2) 1 York centrifugal main machine (YKZ1Z2K75DKG/AH22D) with the voltage level of 6000V (small York main machine). The refrigerating capacity is 8821kW, full-load input power is 1641kW, COP=5.38, evaporator inlet and outlet water temperature is 4.5℃, flow is 946 m3/h, condenser inlet and outlet water temperature is 29℃, flow is 1120 m3/h.
York centrifugal main machine in phase II of energy station
(3) 1 York centrifugal main machine (CYKZ1Z2K7U15DKDFG) with the voltage level of 6000V (large York main machine).
①Refrigerating capacity is 8689kW, full-load input power is 1628kW, COP=5.38, evaporator inlet and outlet water temperature is 4.5℃, flow is 932 m3/h, condenser inlet and outlet water temperature is 29℃, flow is 1105 m3/h.
②Heating capacity is 8900kW, full-load input power is 2235kW, COP=3.98, evaporator inlet and outlet water temperature is 3.5℃, flow is 1452 m3/h,?condenser inlet and outlet water temperature is 39℃, flow is 597 m3/h.
(4) 8 air conditioning circulating pumps, brand: SIEMENS motor, lift: 20m, motor power: 55kW, AC380V; driving mode: Schneide-ATV61-55kW frequency converter control.
Air conditioning circulating pump in phase II of energy station
While making rational use of renewable energy for heating, the river water source heat pump reduces the pressure of shortage of urban gas and power supply caused by gas-fired boiler and electric boiler heating in winter, avoids the high cost of natural gas heating, and reduces the consumption of electricity, gas and coal and pollution emission. After the project is completed, compared with the conventional air conditioning system, the annual power consumption is expected to be reduced by 40%, 4316 tons of standard coal can be saved, the emission of CO2? can be reduced by 10758 tons, and the emission of pollutants such as NO2?and SO2? can also be reduced accordingly.
3. External evaluation of the case
The district low-carbon cooling and heating system of Nanjing International Service Outsourcing Park constructed by Nanjing Fasike Energy Technology Development Co., Ltd., a subsidiary of SPIC Jiangsu Electric Power Co., Ltd., based on the policy of long-term operation with meager profit, can effectively reduce the operation cost of the park, realizing green, low-carbon and sustainable development. The project won the honors of “Renewable Energy Building Application Demonstration Project” of the Ministry of Construction in 2008 and “Integrated Smart Energy Excellent Demonstration Project” of China Electricity Technology Market Association in 2021, and is the largest building energy conservation and emission reduction demonstration project in Jiangsu Province.
????????Green building demonstration project in Jiangsu Province
4. Does the enterprise have overseas cooperation intention related to the case:?yes
5. Project contact and contact method:?Yu Congji 18651630608
