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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

Postal Subscription Code 80-972

2018 Impact Factor: 1.701

Front. Energy    2018, Vol. 12 Issue (4) : 582-590    https://doi.org/10.1007/s11708-018-0592-9
RESEARCH ARTICLE
A comprehensive energy solution for households employing a micro combined cooling, heating and power generation system
Huayi ZHANG1, Can ZHANG2, Fushuan WEN3(), Yan XU4
1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; State Grid Nanjing Power Supply Company, Nanjing 210019, China
2. State Grid Nanjing Power Supply Company, Nanjing 210019, China
3. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
4. School of Electrical and Electronic Engineering, Changsha University of Science and Technology, Changsha 410114, China
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Abstract

In recent years, micro combined cooling, heating and power generation (mCCHP) systems have attracted much attention in the energy demand side sector. The input energy of a mCCHP system is natural gas, while the outputs include heating, cooling and electricity energy. The mCCHP system is deemed as a possible solution for households with multiple energy demands. Given this background, a mCCHP based comprehensive energy solution for households is proposed in this paper. First, the mathematical model of a home energy hub (HEH) is presented to describe the inputs, outputs, conversion and consumption process of multiple energies in households. Then, electrical loads and thermal demands are classified and modeled in detail, and the coordination and complementation between electricity and natural gas are studied. Afterwards, the concept of thermal comfort is introduced and a robust optimization model for HEH is developed considering electricity price uncertainties. Finally, a household using a mCCHP as the energy conversion device is studied. The simulation results show that the comprehensive energy solution proposed in this work can realize multiple kinds of energy supplies for households with the minimized total energy cost.

Keywords energy hub      micro combined cooling      heating and power generation (mCCHP)      thermal comfort      robust optimization     
Corresponding Author(s): Fushuan WEN   
Just Accepted Date: 27 September 2018   Online First Date: 03 December 2018    Issue Date: 21 December 2018
 Cite this article:   
Huayi ZHANG,Can ZHANG,Fushuan WEN, et al. A comprehensive energy solution for households employing a micro combined cooling, heating and power generation system[J]. Front. Energy, 2018, 12(4): 582-590.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-018-0592-9
https://academic.hep.com.cn/fie/EN/Y2018/V12/I4/582
Fig.1  The framework of a HEH
PMV +3 +2 +1 0 –1 –2 –3
Comfort level Hot Warm Slightly warm Neutral Slightly cool Cool Cold
Tab.1  PMV and thermal comfort
Fig.2  Time-of-use tariffs in a day
Fig.3  Hot water demands in a day
Fig.4  Demand of inflexible electricity loads in a day
Flexible demand Rate power/kW Run time/min Operating period
Washer (WS) 0.5 45 7 am–11 am
Dishwasher (DW) 1.28 75 12 pm–18 pm
Dryer (DY) 0.9 45 7 am–12 pm
Iron (IR) 1.3 15 19 pm–22 pm
Cleaner (CL) 1.1 60 8 am–12 pm
Tab.2  Parameters of flexible electricity loads
hCCHPmin /kW pCCHP min/kW PEC min/kW ηe/% ZEC κgas/(kWh?m–3)
0 0 0 30 3 9.78
hCCHP max/kW pCCHP max/kW PEC max/kW ηh/% ZAC
3 1.8 1 50 0.7
Tab.3  Parameters of the mCCHP
R/(ºC?kW–1) θws min/ºC Cw/(kWh?(kg·ºC)–1) θcw/ºC Δθin/ºC
18 40 1.1667×10-3 10 0.5
ρw/(kg?m–3) θws max/ºC Cair/(kWh? ºC–1) Vw/L Δθws/ºC
103 50 0.525 150 0.5
Tab.4  Parameters of thermal resistance, temperature, specific heat capacity, water storage volume, and water density
Fig.5  Temperature control results, storage water tank heating power, air heating power, and output heating power of the mCCHP in a typical winter day
Fig.6  Temperature control results, storage water tank heating power, air cooling power, and output heating power of the mCCHP in a typical summer day
Γ ε/% Cost (CNY) Relative change in the optimal value of the robust optimization model/%
Winter 0 58.09 20.1665 0
4 27.01 20.6581 2.4377
8 7.65 21.056 4.4108
12 1.24 21.3511 5.8741
Summer 0 58.09 16.0039 0
4 27.01 16.5237 3.25
8 7.65 16.7977 4.96
12 1.24 16.9353 5.82
Tab.5  Robust optimization results in a typical winter day and a typical summer day
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