Heating load, COP, exergy loss rate, exergy output rate and ecological analyses and optimisations for irreversible universal steady flow variable temperature heat reservoir heat pump cycle model

In the Part 1 of this paper, a variable temperature heat reservoir irreversible intercooling regenerative Brayton combined heat and power (CHP) plant model is set up, and the exergy efficiency and exergy output rate formulae are obtained. The optimization of pressure ratios and the influence analyses of some vital parameters on the exergy performances are carried out. In this Part, the heat conductance distributions about the high temperature-side heat exchanger, regenerator, intercooler, thermal consumer exchanger and low temperature-side heat exchanger, and the pressure ratios are optimized step by step. The effects of main parameters (such as of turbine and compressor efficiencies, working substance pressure drop loss, heat consumer required temperature, and so on) on the optimum exergy performances are investigated, and the heat capacitance rate matching between the heat reservoirs and working substance is studied.

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Performance Optimization of a Combined Heat Pump Cycle

Open Systems & Information Dynamics ◽

10.1023/b:opsy.0000009557.31330.ef ◽

2003 ◽

Vol 10 (04) ◽

pp. 377-389 ◽

Cited By ~ 4

Author(s):

Lingen Chen ◽

Yuehong Bi ◽

Fengrui Sun ◽

Chih Wu

Keyword(s):

Heat Resistance ◽

Steady Flow ◽

Heat Pump ◽

Performance Optimization ◽

Coefficient Of Performance ◽

Cycle Model ◽

Heat Leakage ◽

Heating Load ◽

Internal Irreversibility ◽

Optimal Heating

A steady flow combined heat pump cycle model with heat resistance, heat leakage and internal irreversibility is built in this paper. The optimal performance of the model is studied. The relation between optimal heating load and coefficient of performance (COP), as well as the maximum COP and the corresponding heating load are derived.

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Heating load and COP optimisations for a universal steady flow endoreversible heat pump model

International Journal of Ambient Energy ◽

10.1080/01430750.2011.584453 ◽

2011 ◽

Vol 32 (2) ◽

pp. 70-77

Author(s):

Huijun Feng ◽

Lingen Chen ◽

Fengrui Sun ◽

Chih Wu

Keyword(s):

Steady Flow ◽

Heat Pump ◽

Heating Load

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Modelling, Analyses and Optimization for Exergy Performance of an Irreversible Intercooled Regenerated Brayton CHP Plant: Part 1 — Thermodynamic Modelling and Parametric Analyses

Volume 6: Energy ◽

10.1115/imece2017-70045 ◽

2017 ◽

Cited By ~ 2

Author(s):

Lingen Chen ◽

Bo Yang ◽

Huijun Feng ◽

Zemin Ding

Keyword(s):

Heat Exchangers ◽

Variable Temperature ◽

Pressure Ratio ◽

Exergy Efficiency ◽

Heat Reservoir ◽

Output Rate ◽

Rate Versus ◽

Optimum Heat ◽

Set Up ◽

Parametric Analyses

A variable-temperature heat reservoir irreversible intercooling regenerated Brayton combined heat and power (CHP) plant model is set up in this paper. The model considers the heat transfer losses in all the heat exchangers, the working substance pressure drop loss in the piping, and the expansion and compression losses in turbine and compressor. Exergy output rate and exergy efficiency are considered as the research targets, and their analytical formulae are obtained. The optimal performances are gotten by optimizing the intercooled pressure ratio and total pressure ratio. The influences of some important parameters on the performances are studied in detail. Besides, the relation of exergy output rate versus exergy efficiency is investigated, and the curve is loop-shaped one. The results indicate that optimum heat capacity rate matching between the heat reservoir and working substance, and optimum heat consumer required temperature exist respectively, which generate double-maximal exergy output rate and double-maximal exergy efficiency, respectively. The heat conductance allocation optimization of all the heat exchangers will be carried out in Part 2 of this paper.

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