Improvement of the cogeneration plant economy by using heat accumulator

Bogdan, Željko; Kopjar, Damir

doi:10.1016/j.energy.2006.01.012

Cited by 71 publications

(23 citation statements)

References 4 publications

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“…This operation has significant energetic advantages, as the cogeneration guarantees a reduction in the primary energy consumption, in comparison to the separate production of heat and power, as well as economic advantages [11].…”

Section: Introductionmentioning

confidence: 99%

Primary energy savings through thermal storage in district heating networks

Verda

Colella

2011

Energy

203

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Section: Introductionmentioning

confidence: 99%

Primary energy savings through thermal storage in district heating networks

Verda

Colella

2011

Energy

203

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“…Khan et al [10] integrated heat accumulator with combined heating and power system to match the hot water supply and demand through the dynamic charge and discharge processes of the TES equipment. Bogdan and Kopjar [11] and Campos et al [12] conducted similar studies and found that profitability of co-generation system with TES equipment was impacted by various external factors. The results inferred that the water tanks might substantially improve the economic performance when electricity price was governed by the dual-time tariff policy.…”

Section: Introductionmentioning

confidence: 93%

Optimal phase change temperature for building cooling heating and power system with PCM-TES based on energy storage effectiveness

Zhang¹,

Wang²,

Zhang³

2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI170222184ZIntegrating thermal energy storage (TES) equipment with building cooling heating and power (BCHP) system can improve system thermal performance. In this paper, a simplified model of TES-BCHP system composed of a gas turbine, an absorption chiller and TES equipment with PCM is presented. To evaluate the energy saving effect of PCM-TES, a new index, energy storage effectiveness, is proposed and its relationship with primary energy consumption is established. Aimed at maximizing the energy storage effectiveness, the optimal phase change temperature of the PCM-TES-BCHP system is obtained. The results show that the theoretically optimal phase change temperature is just the geometrical average value of ambient temperature and exhaust gas temperature from gas turbine for ideal PCM-TES equipment with infinite number of transfer units. It also indicates that both energy storage effectiveness and optimal phase change temperature increase with increasing number of transfer units. So improving the thermal performance of PCM-TES device is favorable for increasing energy efficiency and saving primary energy consumption accordingly. This work is of great importance in guiding the optimization design of practical phase change temperature of the PCM-TES-BCHP systems.

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“…Among the various thermal storage styles, heat accumulator is a promising option due to low cost and environmental friendliness [25]. This accumulator utilizes the water as the heat storage medium, storing and releasing the heat energy based on the principle that the water with different temperature is stratified into several layers [18].…”

Section: Thermal Energy Storage Modelmentioning

confidence: 99%

Integrated Combined Heat and Power System Dispatch Considering Electrical and Thermal Energy Storage

Yuan

Lei

et al. 2016

Energies

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Wind power has achieved great development in Northern China, but abundant wind power is dissipated, rather than utilized, due to inflexible electricity production of combined heat and power (CHP) units. In this paper, an integrated CHP system consisting of CHP units, wind power plants, and condensing power plants is investigated to decouple the power and heat production on both the power supply side and heat supply side, by incorporating electrical energy storage (EES) and thermal energy storage (TES). Then the integrated CHP system dispatch (ICHPSD) model is formulated to reach the target of reducing wind power curtailment and primary energy consumption. Finally, the feasibility and effectiveness of the proposed ICHPSD model are verified by the six-bus system, and the simulation results show that EES has a better effect on wind power integration than TES. The annual net benefits by incorporating EES and TES increase with increasing wind penetration, but they gradually approach saturation. Introducing both EES and TES can largely increase the amount of wind power integration and improve the operation efficiency of the system. Energies 2016, 9, 474 2 of 17 technologies which are suitable for large-scale applications, conventional battery storage is efficient but the investment would be very high. Pumped hydro is fit for large-scale applications but it is applicable only in certain locations [11]. Nowadays, hydrogen storage is emerging as a promising alternative due to high energy density, clean fuel, and relatively low capital cost [12,13]. Adding hydrogen storage to a CHP system could improve the accommodation of wind power, as well as primary energy saving, since the wind energy curtailed in off-peak hours could be used to split water into hydrogen and oxygen. Hydrogen would be stored and then transformed to electrical energy, when necessary, by various ways.Thermal energy storage (TES) is another attractive option for wind energy integration. Although thermal storage is not directly related with electrical energy production, introducing TES is an efficient solution to relieve the mismatch between heat/power demand and supply, by decoupling the generation of electricity and heat [14]. The surplus thermal energy is stored during the operating periods for a later use when electrical demand is low, leading to a decrease in heat production of CHP plants, along with a reduction in electricity production, as a result, wind power would be better integrated. Under the influence of real-time electricity pricing, a large number of TES units have been installed in European countries which have a large percentage of wind power [15]. For example, in Denmark, TES systems have been an important part of its 100% renewable energy system plan [16].Many studies have been involved in the flexible operation of integrated CHP systems recently. In [17], heat pumps and thermal inertia of buildings and thermal comfort of end users are considered to increase the wind power integration. In [18], electric boilers and heat storage tanks are...

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Improvement of the cogeneration plant economy by using heat accumulator

Cited by 71 publications

References 4 publications

Primary energy savings through thermal storage in district heating networks

Primary energy savings through thermal storage in district heating networks

Optimal phase change temperature for building cooling heating and power system with PCM-TES based on energy storage effectiveness

Integrated Combined Heat and Power System Dispatch Considering Electrical and Thermal Energy Storage

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