Thermodynamic Analysis of a New Combined Cooling, Heating and Power System Using CO2 Working Fluid

doi:10.12096/j.2096-4528.pgt.21017

Abstract

Abstract:

In order to develop and utilize low-grade thermal energy such as solar energy, geothermal energy, industrial waste heat, etc, this paper proposed a combined cooling, heating and power system using CO₂ as the working fluid. The system, coupling the supercritical CO₂ Brayton power generation cycle and the transcritical CO₂ compression refrigeration cycle by sharing the condenser, can provide users with electricity, refrigerant water and domestic hot water at the same time. This paper established the thermodynamic mathematical models of the proposed system in detail, and conducted numerical simulation of its operating conditions. The simulation results showed that the net output power of the simulated system is 140.34 kW, cooling capacity is 340.50 kW, heating capacity is 5 ?332.75 kW, thermal efficiency is 113.27%, and exergy efficiency is 41.24%. Then, on this basis, the sensitivity analysis of thermodynamic parameters of the system was carried out, and the effects of five thermodynamic parameters, including turbine inlet pressure, turbine outlet pressure, turbine inlet temperature, evaporator pressure and CO₂ flow ratio of top cycle and bottom cycle, on the performance of the system were obtained.

Key words: carbon dioxide, combined cooling, heating and power, numerical simulation, parameter analysis

CLC Number:

TK 11

Yaonan GAO, Haifeng CHEN, Jianyong WANG. Thermodynamic Analysis of a New Combined Cooling, Heating and Power System Using CO₂ Working Fluid[J]. Power Generation Technology, 2022, 43(1): 131-138.

Figures/Tables 10

References 18

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参数	数值
环境压力/kPa	101.3
环境温度/℃	20
热源进口温度/℃	170
热源流体质量流量/(kg·s^-1)	10
用户热水温度/℃	60
冷媒水温度/℃	5
透平进口温度/℃	165
透平进口压力/MPa	14
透平出口压力/MPa	8.5
顶循环和底循环的CO₂流量比	8
透平等熵效率/%	80
压缩机等熵效率/%	70

参数	数值
环境压力/kPa	101.3
环境温度/℃	20
热源进口温度/℃	170
热源流体质量流量/(kg·s^-1)	10
用户热水温度/℃	60
冷媒水温度/℃	5
透平进口温度/℃	165
透平进口压力/MPa	14
透平出口压力/MPa	8.5
顶循环和底循环的CO₂流量比	8
透平等熵效率/%	80
压缩机等熵效率/%	70

状态点	温度/℃	压力/kPa	焓/(kJ·kg^-1)	熵/(kJ·kg^-1·K^-1)	干度	流量/(kg·s^-1)
1	32.00	8 500.00	288.94	1.29	1.00	18.83
2	43.99	14 000.00	299.89	1.30	1.00	18.83
3	165.00	14 000.00	572.49	2.05	1.00	18.83
4	123.11	8 500.00	546.45	2.06	1.00	18.83
5	118.59	8 500.00	540.70	2.05	1.00	21.18
6	32.00	8 500.00	288.94	1.29	1.00	21.18
7	32.00	8 500.00	288.94	1.29	1.00	2.35
8	-5.55	3 000.00	288.94	1.33	0.41	2.35
9	-5.55	3 000.00	433.61	1.88	1.00	2.35
10	85.16	8 500.00	494.70	1.93	1.00	2.35
g1	170.00	900.00	719.14	2.04	—	10.00
g2	48.99	900.00	205.88	0.69	—	10.00
b1	20.00	101.30	84.01	0.30	—	31.89
b2	60.00	101.30	251.25	0.83	—	31.89
c1	20.00	101.30	84.01	0.30	—	5.41
c2	5.00	101.30	21.12	0.08	—	5.41

状态点	温度/℃	压力/kPa	焓/(kJ·kg^-1)	熵/(kJ·kg^-1·K^-1)	干度	流量/(kg·s^-1)
1	32.00	8 500.00	288.94	1.29	1.00	18.83
2	43.99	14 000.00	299.89	1.30	1.00	18.83
3	165.00	14 000.00	572.49	2.05	1.00	18.83
4	123.11	8 500.00	546.45	2.06	1.00	18.83
5	118.59	8 500.00	540.70	2.05	1.00	21.18
6	32.00	8 500.00	288.94	1.29	1.00	21.18
7	32.00	8 500.00	288.94	1.29	1.00	2.35
8	-5.55	3 000.00	288.94	1.33	0.41	2.35
9	-5.55	3 000.00	433.61	1.88	1.00	2.35
10	85.16	8 500.00	494.70	1.93	1.00	2.35
g1	170.00	900.00	719.14	2.04	—	10.00
g2	48.99	900.00	205.88	0.69	—	10.00
b1	20.00	101.30	84.01	0.30	—	31.89
b2	60.00	101.30	251.25	0.83	—	31.89
c1	20.00	101.30	84.01	0.30	—	5.41
c2	5.00	101.30	21.12	0.08	—	5.41

参数	数值
W_tb/kW	490.36
W_com1/kW	206.25
W_com2/kW	143.77
W_net/kW	140.34
Q_heat/kW	5 332.75
E_heat/kW	333.81
Q_cool/kW	340.50
E_cool/kW	9.03
Q_in/kW	5 132.60
E_in/kW	1 171.52
η_thm/%	113.27
η_exg/%	41.24

Thermodynamic Analysis of a New Combined Cooling, Heating and Power System Using CO₂ Working Fluid

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