Study on the characteristics of the second type heat pump with [Li(TX-7)]SCN/H2O as the working fluid pair

doi:10.11949/0438-1157.20211050

Abstract

Abstract:

The saturated vapor pressure of the [Li(TX-7)]SCN/H₂O solution at 283.15—443.15 K was measured by the static method, and the specific heat capacity of the ionic liquid [Li(TX-7)]SCN under the condition of temperature T=73.15—423.15 K was measured by the differential scanning method, and an empirical correlation formula is established. The excess enthalpy of the [Li(TX-7)]SCN/H₂O solution component activity coefficient was predicted by the Wilson model, and the specific enthalpy of the binary solution was calculated by the predicted value, and the thermodynamic model of [Li(TX-7)]SCN/H₂O was established. Based on the experimental data and thermodynamic model, the theoretical cycle characteristics of the second type heat pump with [Li(TX-7)]SCN/H₂O as the working fluid pair are simulated and analyzed, the influence of different operating temperatures of various components on the performance parameters of the system is studied and compared with the performance parameters of other absorption systems. The performance of the [Li(TX-7)]SCN/H₂O system is better than that of the LiBr/H₂O system, and it is suitable for working conditions with lower generation and evaporation temperatures.

Key words: ionic liquid, vapor-liquid equilibrium, specific heat capacity, excess enthalpy, cycle characteristics simulation

摘要：

通过静态法测量了[Li（TX-7）]SCN/H₂O溶液在283.15~443.15 K温度条件下的饱和蒸气压，通过差式扫描量热法测量了离子液体[Li（TX-7）]SCN在温度T=73.15~423.15 K条件下的比热容，并建立了经验关联式，通过Wilson模型对[Li（TX-7）]SCN/H₂O溶液组分活度系数的关联预测了其过量焓，并通过预测值计算了二元溶液的比焓，建立了[Li（TX-7）]SCN/H₂O的热力学模型。基于实验数据与热力学模型对以[Li（TX-7）]SCN/H₂O为工质对的第二类热泵的理论循环特性进行了仿真分析，研究了各部件不同工作温度对系统性能参数的影响，并与其他吸收式系统的性能参数进行了比对。[Li（TX-7）]SCN/H₂O系统的性能优于LiBr/H₂O系统，适用于发生温度和蒸发温度较低的工况。

关键词: 离子液体, 气液相平衡, 比热容, 过量焓, 循环特性仿真

CLC Number:

TB 657.5

Hao XU, Wei CHEN, Zoulu LI. Study on the characteristics of the second type heat pump with [Li(TX-7)]SCN/H₂O as the working fluid pair[J]. CIESC Journal, 2022, 73(2): 577-586.

许昊, 陈伟, 李邹路. 以［Li（TX-7）］SCN/H₂O为工质对的第二类热泵特性研究[J]. 化工学报, 2022, 73(2): 577-586.

Figures/Tables 16

References 31

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T/K	x₁	p^exp/kPa	p^cal/kPa	T/K	x₁	p^exp/kPa	p^cal/kPa
283.15	0.797	0.0856	0.08299	363.15	0.9438	5.57287	5.604
283.15	0.8381	0.09166	0.0875	363.15	0.962	5.96216	5.808
283.15	0.8863	0.09584	0.09303	363.15	0.9748	6.09391	6.038
283.15	0.9181	0.09602	0.09704	363.15	0.9864	6.28673	6.516
283.15	0.9441	0.10306	0.101	383.15	0.7883	8.8827	9.254
283.15	0.9622	0.10464	0.1047	383.15	0.8327	10.09642	9.8
283.15	0.9748	0.1048	0.1089	383.15	0.8837	10.90799	10.45
283.15	0.9865	0.1201	0.1177	383.15	0.9168	10.68407	10.92
303.15	0.7962	0.79216	0.8221	383.15	0.9435	11.22677	11.36
303.15	0.8377	0.90821	0.867	383.15	0.9619	11.52549	11.78
303.15	0.8861	0.93747	0.9221	383.15	0.9747	11.91511	12.24
303.15	0.918	0.93043	0.9619	383.15	0.9864	12.76151	13.21
303.15	0.9441	1.04611	1.001	403.15	0.7806	16.78926	17.16
303.15	0.9622	1.053	1.037	403.15	0.8279	17.59822	18.24
303.15	0.9748	1.12895	1.079	403.15	0.8814	19.86943	19.52
303.15	0.9865	1.21894	1.165	403.15	0.9156	19.49984	20.42
323.15	0.795	2.14416	2.059	403.15	0.943	21.85056	21.26
323.15	0.8369	2.2736	2.173	403.15	0.9617	22.46175	22.04
323.15	0.8857	2.20496	2.312	403.15	0.9746	23.48982	22.91
323.15	0.9178	2.46411	2.412	403.15	0.9864	24.11513	24.71
323.15	0.944	2.39284	2.509	423.15	0.7672	29.66389	29.5
323.15	0.9621	2.65719	2.601	423.15	0.8199	31.38543	31.6
323.15	0.9748	2.66227	2.704	423.15	0.8777	34.91273	34.01
323.15	0.9865	2.93622	2.92	423.15	0.9138	34.21	35.64
343.15	0.795	2.14416	2.059	423.15	0.9422	38.28398	37.16
343.15	0.8369	2.2736	2.173	423.15	0.9613	39.18233	38.54
343.15	0.8857	2.20496	2.312	423.15	0.9745	39.09559	40.06
343.15	0.9178	2.46411	2.412	423.15	0.9864	44.70965	43.19
343.15	0.944	2.39284	2.509	443.15	0.7439	49.42704	47.24
343.15	0.9621	2.65719	2.601	443.15	0.8063	53.51628	51.33
343.15	0.9748	2.66227	2.704	443.15	0.8717	57.19172	55.78
343.15	0.9865	2.93622	2.92	443.15	0.9109	60.59978	58.68
363.15	0.7927	4.65111	4.586	443.15	0.941	59.42647	61.28
363.15	0.8354	4.84301	4.846	443.15	0.9608	61.51926	63.6
363.15	0.885	5.34156	5.16	443.15	0.9742	66.17082	66.13
363.15	0.9174	5.13665	5.386	443.15	0.9863	69.564	71.28

T/K	x₁	p^exp/kPa	p^cal/kPa	T/K	x₁	p^exp/kPa	p^cal/kPa
283.15	0.797	0.0856	0.08299	363.15	0.9438	5.57287	5.604
283.15	0.8381	0.09166	0.0875	363.15	0.962	5.96216	5.808
283.15	0.8863	0.09584	0.09303	363.15	0.9748	6.09391	6.038
283.15	0.9181	0.09602	0.09704	363.15	0.9864	6.28673	6.516
283.15	0.9441	0.10306	0.101	383.15	0.7883	8.8827	9.254
283.15	0.9622	0.10464	0.1047	383.15	0.8327	10.09642	9.8
283.15	0.9748	0.1048	0.1089	383.15	0.8837	10.90799	10.45
283.15	0.9865	0.1201	0.1177	383.15	0.9168	10.68407	10.92
303.15	0.7962	0.79216	0.8221	383.15	0.9435	11.22677	11.36
303.15	0.8377	0.90821	0.867	383.15	0.9619	11.52549	11.78
303.15	0.8861	0.93747	0.9221	383.15	0.9747	11.91511	12.24
303.15	0.918	0.93043	0.9619	383.15	0.9864	12.76151	13.21
303.15	0.9441	1.04611	1.001	403.15	0.7806	16.78926	17.16
303.15	0.9622	1.053	1.037	403.15	0.8279	17.59822	18.24
303.15	0.9748	1.12895	1.079	403.15	0.8814	19.86943	19.52
303.15	0.9865	1.21894	1.165	403.15	0.9156	19.49984	20.42
323.15	0.795	2.14416	2.059	403.15	0.943	21.85056	21.26
323.15	0.8369	2.2736	2.173	403.15	0.9617	22.46175	22.04
323.15	0.8857	2.20496	2.312	403.15	0.9746	23.48982	22.91
323.15	0.9178	2.46411	2.412	403.15	0.9864	24.11513	24.71
323.15	0.944	2.39284	2.509	423.15	0.7672	29.66389	29.5
323.15	0.9621	2.65719	2.601	423.15	0.8199	31.38543	31.6
323.15	0.9748	2.66227	2.704	423.15	0.8777	34.91273	34.01
323.15	0.9865	2.93622	2.92	423.15	0.9138	34.21	35.64
343.15	0.795	2.14416	2.059	423.15	0.9422	38.28398	37.16
343.15	0.8369	2.2736	2.173	423.15	0.9613	39.18233	38.54
343.15	0.8857	2.20496	2.312	423.15	0.9745	39.09559	40.06
343.15	0.9178	2.46411	2.412	423.15	0.9864	44.70965	43.19
343.15	0.944	2.39284	2.509	443.15	0.7439	49.42704	47.24
343.15	0.9621	2.65719	2.601	443.15	0.8063	53.51628	51.33
343.15	0.9748	2.66227	2.704	443.15	0.8717	57.19172	55.78
343.15	0.9865	2.93622	2.92	443.15	0.9109	60.59978	58.68
363.15	0.7927	4.65111	4.586	443.15	0.941	59.42647	61.28
363.15	0.8354	4.84301	4.846	443.15	0.9608	61.51926	63.6
363.15	0.885	5.34156	5.16	443.15	0.9742	66.17082	66.13
363.15	0.9174	5.13665	5.386	443.15	0.9863	69.564	71.28

t/℃	c_p/(kJ/(kg·K))	t/℃	c_p/(kJ/(kg·K))	t/℃	c_p/(kJ/(kg·K))
0	2.283	55	2.568	115	2.784
10	2.303	70	2.603	130	2.803
25	2.354	85	2.687	140	2.829
40	2.46	100	2.722	150	2.858

t/℃	c_p/(kJ/(kg·K))	t/℃	c_p/(kJ/(kg·K))	t/℃	c_p/(kJ/(kg·K))
0	2.283	55	2.568	115	2.784
10	2.303	70	2.603	130	2.803
25	2.354	85	2.687	140	2.829
40	2.46	100	2.722	150	2.858

状态点	T/K	x₁	p/kPa	h/(kJ/kg)
1	353.15	1.000	3.972	1758.09
2	371.28	0.971	17.679	147.64
3	353.15	0.806	3.972	168.39
4	303.15	1.000	3.972	125.49
5	303.15	1.000	44.591	125.49
6	353.15	1.000	44.591	156.01
7	403.15	0.971	44.591	187.92
8	377.24	0.806	9.716	236.14
9	383.15	0.971	29.679	187.92
10	377.24	0.806	9.716	236.14

Study on the characteristics of the second type heat pump with [Li(TX-7)]SCN/H₂O as the working fluid pair

以［Li（TX-7）］SCN/H₂O为工质对的第二类热泵特性研究

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Figures/Tables 16

References 31

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工质对	ω_1,A/%(质量)	ω_1,G/%(质量)	f	COP
[Li(TX-7)]SCN/H₂O	46.5	32.3	4.78	0.469
LiBr/H₂O	49.6	37.2	5.08	0.456
[mmim]DMP/CH₃OH	31.2	17.2	5.90	0.436
[mmim]DMP/H₂O	35.3	23.2	6.35	0.423
NaSCN/NH₃	53.1	43.2	5.73	0.428

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