Evaluation of combined cooling, heating and power (CCHP) systems with energy storage units at different locations

Zeng, Guangbiao; Li, Minzhi; Shi, Lin

doi:10.1016/j.applthermaleng.2015.11.011

Cited by 41 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combined cooling, heating, and power systems (CCHP) are efficient and eco-friendly energy systems with reduced energy consumption and greenhouse gas emissions. By introducing energy storage units (ESUs) into CCHP systems, the energy mismatch between the supply from CCHP systems and the demand of users could be alleviated and the CCHP systems are able to operate stably with reduced capacities [1,2,3]. Phase change materials, with high thermal storage density and isothermal operation, are expected to be used as short-term storage in CCHP systems to further improve the energy efficiency by the rational distribution of thermal energy in time and space.…”

Section: Introductionmentioning

confidence: 99%

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Yang

2019

Molecules

View full text Add to dashboard Cite

The storage and utilization of waste heat in low and medium temperature ranges using phase change materials (PCMs) is an effective technology to improve energy utilization efficiency in combined cooling, heating, and power (CCHP) systems. In this paper, stearic acid/inorganic porous matrix phase change composites were developed to store waste heat for hot water systems. Among them, stearic acid/expanded graphite (EG) phase change composite was highlighted and the thermal physical properties, the dynamic response, and the long-term cyclic stability were evaluated. The stearic acid concentrations in the composites were over 95 wt%. The thermal diffusion coefficients were 3–5 times higher than pure stearic acid, independent of composite densities. Accordingly, the heat storage and release times were decreased by up to 41% and 55%, respectively. After 100 cycles, the composites maintained good dynamic response and long-term cyclic stability, with heat storage density of 122–152 MJ/m3. Hence, this stearic acid/EG phase change composite exhibits excellent comprehensive performances. It is also easy to be prepared and flexible for various types of heat exchangers.

show abstract

Section: Introductionmentioning

confidence: 99%

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Yang

2019

Molecules

View full text Add to dashboard Cite

show abstract

“…The national standards of China then give E ref,p = 354.71 gce/kWh, E ref,c = 80.61 gce/kWh, and E ref,h = 147.25 gce/kWh. Readers are referred to the previous studies about the ESR calculational method .…”

Section: Evaluation Criteriamentioning

confidence: 99%

“…where t A means the start time and t B means the end time of the energy supply period. The detailed analysis of realistic ESUs has been given in a our published paper [17]. Because the grid can be regarded as a condenser to store and release electricity, no additional electrical ESU is included in the discussion.…”

Section: Combined Cooling Heating and Power User Energy Demands And mentioning

confidence: 99%

See 1 more Smart Citation

Multiple effects of energy storage units on combined cooling, heating and power (CCHP) systems

Zeng

Shi

2016

Int. J. Energy Res.

Self Cite

View full text Add to dashboard Cite

Summary Albeit numerous studies discussing manifold issues of combined cooling, heating and power (CCHP) systems, there is still lack of theoretical studies indicating to what extent the energy mismatch and the deviating working conditions affect the CCHP performance, absence of reports systematically summarizing the multiple effects of energy saving units (ESUs), and deficiency of research quantifying the benefits from ESUs to energy savings. The shortage of such studies will confuse some CCHP designers when a CCHP system is designed. Therefore, in this research, theoretical discussions have been undertaken about the energy mismatch issue between CCHP systems and their users as well as the multiple effects of ESUs on CCHP systems. An improved calculational method of energy storage rate (ESR) has been adopted to evaluate the energy savings performance of CCHP systems. Two general heat‐to‐electricity ratios (Ruser for CCHP users and RCCHP for CCHP systems) have been used to quantify the energy mismatch between CCHP systems and their users. In the regime of ‘priority of providing cooling’, the ESR reaches its maximum when Ruser is equal to RCCHP. Otherwise, the ESR tends to decrease rapidly, especially when the electrical demand must be supplemented from the grid. Furthermore, when the CCHP system produces more electricity than required, the payment mode of extra electricity from the CCHP system will significantly affect the ESR. Therefore, it is imperative to reach an international consensus regarding the dispose of extra CCHP products. The theoretical analyses also corroborate the advantages of incorporating an ESU into a CCHP system. The ESU enables the CCHP system components to operate at their optimal working conditions. Meanwhile, the power generation unit and the absorption refrigerator capacities can then be reduced. Moreover, the ESU also promotes the productivity of electricity and ensures an undiminished ESR regardless of what extra electricity payment mode is adopted. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

“…Huang et al [11] explored the water-saving, environmental protection and economical features of the operation mode in sewage source heat pump (SSHP) + CCHP system; Wang et al [12], Zhang [13] further optimized CCHP system configuration, combined it with ground source heat pump (GSHP) and water source heat pump (WSHP), and realized complementary multi-energy supplies. In order to realize deep recycling of waste heat of exhaust gas, Hong et al [14] proposed a coupled ASHP + CCHP system, and analyzed the influence of recoverable waste heat in the system, coefficient of performance (COP) of heat pump and primary energy ratio; Zhang et al [15] found that the overall performance of CCHP + GSHP is the optimum after comparative studies, overall annual cost-saving ratio is 0.1582, and CO 2 emission reduction ratio is 0.5278; Rong et al [16] established the optimization model of the coupled CCHP-GSHP system, and adopted the genetic algorithm to optimize the system capacity and operation with variables rated generated capacity of generator set, the GSHP cooling capacity to total cooling load ratio and GSHP heating and total thermal load ratio; Jiang et al [17] studied the influence of different energy conservation technologies on energy-saving rate (ESRs) of CCHP system, and presented upper and lower limit values of energy utilization efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Performance Analysis on Multi-Energy Coupled CCHP System

Tian¹,

Sun²,

Xu³

et al. 2022

Energy Engineering

View full text Add to dashboard Cite

Although the Combined Cooing, Heating and Power System (hereinafter referred to as "CCHP") improves the capacity utilization rate and energy utilization efficiency, single use of CCHP system cannot realize dynamic matching between supply and demand loads due to the unbalance features of the user's cooling and heating loads. On the basis of user convenience and wide applicability of clean air energy, this paper tries to put forward a coupled CCHP system with combustion gas turbine and ASHP ordered power by heat, analyze trends of such parameters as gas consumption and power consumption of heat pump in line with adjustment of heating load proportion of combustion gas turbine, and optimize the system ratio in the method of annual costs and energy environmental benefit assessment. Based on the analysis of the hourly simulation and matching characteristics of the cold and hot load of the 100 thousand square meter building, it is found that the annual cost of the air source heat pump is low, but the energy and environmental benefits are poor. It will lead to 6.35% shortage of cooling load in summer. Combined with the evaluation method of primary energy consumption and zero carbon dioxide emission, the coupling system of CHHP and air source heat pump with 41% gas turbine load ratio is the best configuration. This system structure and optimization method can provide some reference for the development of CCHP coupling system.

show abstract

Evaluation of combined cooling, heating and power (CCHP) systems with energy storage units at different locations

Cited by 41 publications

References 16 publications

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Multiple effects of energy storage units on combined cooling, heating and power (CCHP) systems

Dynamic Simulation and Performance Analysis on Multi-Energy Coupled CCHP System

Contact Info

Product

Resources

About