Multi-energy coupled cooling/heating system for buildings in long-term cooling region and operation method

A multi-energy coupled cooling/heating system for buildings in a long-term cooling region, including a multi-level management unit for heat sources, a solar energy heat collection unit, a lithium bromide absorptive refrigeration unit, a gas heat complementing unit, a ground source heat pump cooling/heating unit, and an indirect evaporative cooling waste heat recovery unit;

• the multi-level management unit for heat sources is respectively connected to the solar energy heat collection unit, the lithium bromide absorptive refrigeration unit, the gas heat complementing unit, and the ground source heat pump cooling/heating unit;
• the ground source heat pump cooling/heating unit is respectively connected to the lithium bromide absorptive refrigeration unit, the gas heat complementing unit, and the indirect evaporative cooling waste heat recovery unit;
• the lithium bromide absorptive refrigeration unit includes a first refrigeration unit heat exchanger (E10), a first shell side outlet of the first refrigeration unit heat exchanger (E10) is successively connected to a shell side inlet of a second refrigeration unit heat exchanger (E11), a shell side outlet of the second refrigeration unit heat exchanger (E11), a first throttle valve (E12), a shell side inlet of a third refrigeration unit heat exchanger (E13), a shell side outlet of the third refrigeration unit heat exchanger (E13), a shell side inlet of a fourth refrigeration unit heat exchanger (E14), a shell side outlet of the fourth refrigeration unit heat exchanger (E14), a first solution pump (E16), and a shell side inlet of the first refrigeration unit heat exchanger (E10) through refrigeration circulation pipelines;
• a second outlet of the first refrigeration unit heat exchanger (E10) is connected to a second shell side inlet of the fourth refrigeration unit heat exchanger through a backflow pipeline provided with a throttle valve (E15);
• the first refrigeration unit heat exchanger (E10), the second refrigeration unit heat exchanger (E11), the third refrigeration unit heat exchanger (E13), and the fourth refrigeration unit heat exchanger (E14) are connected in series to form an annular lithium bromide absorptive refrigeration unit;
• an outlet of a fan coil unit (E21) is successively connected to a first tube side inlet of a first ground source heat pump heat exchanger (E17), a first tube side outlet of the first ground source heat pump heat exchanger (E17), a tenth valve (V10), a fifth water pump (P5), a fourteenth valve (V14), a sixteenth valve (V16), and an inlet of the fan coil unit (E21) through fan coil unit heat exchange circulation pipelines;
• an inlet of a first connecting pipeline installed with a ninth valve (V9) communicates with fan coil unit heat exchange circulation pipelines between the first tube side outlet of the first ground source heat pump heat exchanger (E17) and the tenth valve (V10), and an outlet of the first connecting pipeline is connected to a tube side inlet of the third refrigeration unit heat exchanger (E13);
• an inlet of a second connecting pipeline is connected to a tube side outlet of the third refrigeration unit heat exchanger (E13), and an outlet of the second connecting pipeline communicates with fan coil unit heat exchange circulation pipelines between the tenth valve (V10) and the fifth water pump (P5);
• the ground source heat pump cooling/heating unit includes a second tube side outlet of the first ground source heat pump heat exchanger (E17), a ground source heat pump unit compressor (E18), a first tube side inlet of a second ground source heat pump heat exchanger (E19), a first tube side outlet of the second ground source heat pump heat exchanger (E19), a second throttle valve (E20), and a second tube side inlet of the first ground source heat pump heat exchanger (E17) that are sequentially connected through soil source circulation pipelines;
• the first ground source heat pump heat exchanger (E17), the compressor (E18), the second ground source heat pump heat exchanger (E19), and the second throttle valve (E20) are connected in series to form an annular ground source heat pump unit;
• a second tube side outlet of the second ground source heat pump heat exchanger (E19) is successively connected to a sixth water pump (P6), a seventh valve (V7), an inlet of a buried pipe heat exchanger (E9), an outlet of the buried pipe heat exchanger (E9), an eighth valve (V8), and a second tube side inlet of the second ground source heat pump heat exchanger (E19) through heat pump heat exchange circulation pipelines;
• one end of a third connecting pipeline is connected to an inlet of a fresh air heat exchanger (E22), and the other end communicates with fan coil unit circulation pipelines between the fourteenth valve and the sixteenth valve (V16);
• one end of a fourth connecting pipeline is connected to an outlet of the fresh air heat exchanger (E22), and the other end communicates with fan coil unit heat exchange circulation pipelines between a first tube side inlet of the first ground source heat pump heat exchanger (E17) and an outlet of a fan coil unit;
• the gas heat complementing unit includes a gas-fired heating and hot water combi-boiler, and the multi-level management unit for heat sources includes a heating water tank (E7);
• a heat complementing hot water outlet of the heating water storage tank (E7) is successively connected to a seventh water pump (P7), a twelfth valve (V12), a heating inlet of the gas-fired heating and hot water combi-boiler, a heating outlet of the gas-fired heating and hot water combi-boiler, a fifteenth valve (V15), an eleventh valve (V11), and a heat complementing hot water inlet of the heating water storage tank (E7) through heat complementing circulation pipelines;
• one end of a fifth connecting pipeline communicates with heat complementing circulation pipelines between a fifteenth valve (V15) and the eleventh valve, and the other end communicates with fan coil unit heat exchange circulation pipelines between a fourteenth valve (V14) and the sixteenth valve (V16);
• one end of a sixth connecting pipeline installed with a thirteenth valve (V13) communicates with fan coil unit heat exchange circulation pipelines between the fourteenth valve (V14) and the fifth water pump, and the other end communicates with heat complementing circulation pipelines between the twelfth valve and the heating inlet of the gas-fired heating and hot water combi-boiler;
• the indirect evaporative cooling waste heat recovery unit includes an indirect evaporative cooler (E24) and a cooling complementing heat exchanger (E23);
• a wet channel outlet of the indirect evaporative cooler is successively connected to an inlet of a refrigeration side pipeline of the cooling complementing heat exchanger, an outlet of the refrigeration side pipeline, an eighth water pump (V8), and a wet channel inlet of the indirect evaporative cooler (E24) through a cooling circulation pipeline;
• an inlet of a cooling taking side pipeline of the cooling complementing heat exchanger communicates with fan coil unit heat exchange circulation pipelines between the fifth water pump (P5) and the fourteenth valve (V14) through a seventh connecting pipeline installed with an eighteenth valve (V18), and an outlet of the cooling taking side pipeline of the cooling complementing heat exchanger (E23) communicates with a-fan coil unit heat exchange circulation pipelines between a first tube side inlet of the first ground source heat pump heat exchanger and an outlet of a fan coil unit through an eighth connecting pipeline installed with a nineteenth valve (V19);
• a dry channel inlet of the indirect evaporative cooler (E24) communicates with outdoor fresh air, and a dry channel outlet is connected to an air inlet of the fresh air heat exchanger (E22);
• the multi-level management unit for heat sources includes a heat collection tank (E6) and the heating water storage tank (E7);
• an upper circulating water outlet at the top of the heat collection tank (E6) is successively connected to a second water pump (P2), a second valve (V2), and a lower circulating water inlet at the bottom of the heating water storage tank (E7) through a ninth connecting pipeline;
• a lower circulating water outlet at the bottom of the heating water storage tank (E7) is connected to a first valve (V1) and an upper circulating water inlet at the top of the heat collection tank (E6) through a tenth connecting pipeline;
• an outlet of a second heat taking coil unit installed in the middle of the heating water storage tank (E7) is connected to a domestic water end (E3);
• the solar energy heat collection unit includes a solar energy heat collector (E1) and an upper heat collection coil unit at an inner top of the heat collection tank, and an outlet of the solar energy heat collector is connected to an inlet of the upper heat collection coil unit, after heat exchange with hot water stored in the heat collection tank, an outlet of the heat collection coil unit is connected to an inlet of the solar energy heat collector through a first water pump, and a lower heat collection coil unit (E25) is disposed below the inside of the heat collection tank (E6);
• a connection structure of the lithium bromide absorptive refrigeration unit and the multi-level management unit for heat sources is as follows:
• a heat collection hot water outlet at a lower part of the heat collection tank (E6) is successively connected to a fourth water pump (P4), a third valve (V3), and a tube side inlet of a fourth refrigeration unit heat exchanger through an eleventh connecting pipeline;
• a tube side outlet of the fourth refrigeration unit heat exchanger (E14) is connected to a tube side inlet of a second refrigeration unit heat exchanger (E11), a tube side outlet of the second refrigeration unit heat exchanger (E11), a fourth valve (V4), and a heat collection hot water inlet at a lower part of the heat collection tank (E6);
• a tube side outlet of the first refrigeration unit heat exchanger (E10) is successively connected to a third water pump and an inlet of a first heat taking coil unit at an inner top of the heating water storage tank (E7) through a twelfth connecting pipeline;
• an outlet of the first heat taking coil unit is connected to a tube side inlet of the first refrigeration unit heat exchanger (E10);
• connection between the ground source heat pump cooling/heating unit and the multi-level management unit for heat sources is as follows:
• an outlet of a lower heat collection coil unit (E25) communicates with heat pump heat exchange circulation pipelines between the eighth valve and a second tube side inlet of the second ground source heat pump heat exchanger (E19) through a nineteenth connecting pipeline installed with a sixth valve (V6);
• an inlet of the lower heat collection coil unit (E25) communicates with heat pump heat exchange circulation pipelines between the seventh valve and the sixth water pump through a twentieth connecting pipeline installed with a fifth valve (V5).