Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings

Jinan, China

Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings

Jinan, China
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Wang L.,Shandong University | Li Q.,Shandong University | Ding R.,Shandong University | Sun M.,Arizona State University | And 2 more authors.
Energy | Year: 2017

As a Demand Response (DR) based working mode, the integrated scheduling of energy supply and demand provides an effective approach to improve economic and environmental benefits for Microgrids (MGs). However, it is still a challenging issue to cover uncertainties caused by intermittent renewable energy and random loads while optimizing multiple objectives in economy and environment. To tackle this issue, an integrated scheduling approach for MGs is proposed based on robust multi-objective optimization. Firstly, load shifting in a finite time is introduced to express an acceptable DR program for industrial customers. A minimax multi-objective optimization model is formulated to seek the minimum operation costs and emissions under the worst-case realization of uncertainties, which are captured by the robust sets with budgets of uncertainty. Secondly, a strong duality based model transformation method is implemented to cope with the strong coupling and nonlinearity in the proposed formulation. Also, Multi-Objective Cross Entropy (MOCE) algorithm is adopted to solve the reconstructed model for simultaneously optimizing all the objectives. Finally, detailed comparative experiments are conducted in problem level, model level and algorithm level. The simulation results show that the proposed scheduling approach can effectively attenuate the disturbances of uncertainties as well as achieve optimal economic and environmental benefits, compared with single-objective robust optimization scheduling approaches and deterministic multi-objective optimization scheduling approaches. Meanwhile, the validity and effectiveness of the robust multi-objective optimization approach for the MG integrated scheduling problem under uncertainty are confirmed. © 2017


Wu D.,Shandong Jianzhu University | Yu M.-Z.,Shandong Jianzhu University | Yu M.-Z.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2017

Combine with the parameter estimation method, the exhaustive search method is used to measure the ground thermal properties, which reliability is verified by simulation. The exhaustive search method is applied for projects, and the ground thermal parameters calculated are compared with those obtained by the optimization method. The result and analysis demonstrate that the exhaustive search method can find the minimum objective function variance within the search domain and obtain soil thermal parameters with high credibility. As comparison, though the optimization method can also find the minimum objective function variance and obtain the ground thermal conductivity with high credibility, the borehole thermal resistance and volumetric heat capacity determined by it have relative lower credibility. © 2017, Science Press. All right reserved.


Yu T.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Liu P.,Hong Kong Polytechnic University | Chu G.,Shandong University of Technology | Li Y.,Northeast Forestry University
Advanced Materials Research | Year: 2012

Constant geothermal temperature is necessary to the long-term efficient operation of the ground source heat pump. SGSHP (Solar-Ground Source Heat Pump) system adopts solar energy as assistant heat source to maintain the geothermal temperature in cold regions. A design method based on equilibrium geothermal temperature was illustrated with an example of a villa in Beijing, China. Flowchart and control strategy of the combined system were introduced. Average heat collection efficiency and necessary area of the solar collector were derived on the basis of energy balance equation. Geothermal temperature variation was also researched to test if the solar energy and geothermal energy were reasonably matched. Results show that the combined system can maintain a constant geothermal temperature if it is well designed. The solar-ground source heat pump system is efficient, reliable and energy-saving. © (2012) Trans Tech Publications, Switzerland.


Man Y.,Hong Kong Polytechnic University | Man Y.,Shandong Jianzhu University | Man Y.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Yang H.,Hong Kong Polytechnic University | And 3 more authors.
Applied Energy | Year: 2012

Ground coupled heat pump (GCHP) system is regarded as one of the effective energy saving technologies, and obtains popular applications for air conditioning all over the world. However, experimental studies on the GCHP system are still insufficient. In order to investigate the practical performance of GCHP system, the detailed on-site experiments are carried out on a GCHP test rig located in temperate zone. Operation parameters recorded during tests mainly include the temperature distributions of borehole at different depths, the temperature and flow rate of water circulating in the heat pump as well as the ground heat exchanger, the refrigerant pressure, and the power consumption of heat pump as well as circulating pumps. The GCHP system for both cooling provision and heating provision are investigated with two operation modes, which are the intermittent mode and continuous mode. Experimental results indicate that the performance of GCHP system is affected by its operation conditions and modes. Besides, heat and cold accumulation in the ground during cooling and heating provision of the GCHP system are analyzed. © 2011 Elsevier Ltd.


Cui P.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Cui P.,Shandong Jianzhu University | Cui P.,Shandong Key Laboratory of Building Energy saving Technique | Li X.,Shandong Key Laboratory of Building Energy saving Technique | And 2 more authors.
Applied Energy | Year: 2011

This paper investigates the transient heat conduction around the buried spiral coils which could be applied in the ground-coupled heat pump systems with the pile foundation as a geothermal heat exchanger. A transient ring-coil heat source model is developed, and the explicit analytical solutions for the temperature response are derived by means of the Green's function theory and the image method. The influences of the coil pitch and locations are evaluated and discussed according to the solutions. In addition, comparisons between the ring-coil and cylindrical source models give that the improved finite ring-coil source model can accurately describe the heat transfer process of the pile geothermal heat exchanger (PGHE). The analytical solutions may provide a desirable and better tool for the PGHE simulation/design. © 2011 Elsevier Ltd.


Yang D.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Lu X.,Shandong Jianzhu University
Advanced Materials Research | Year: 2014

As Zibo power plant original steam pipes for a long time to run, the strength decreased and resistance was large, transformation was proposed to optimize. A mathematical model of the main steam pipe network was established to analysis changes of temperature, pressure and velocity vector before and after transformation. After transformation, the loss was significantly reduced,so transformation successfully achieve the optimization, adjustment and analysis functions of the main steam pipe network. © (2014) Trans Tech Publications, Switzerland.


Wang D.,Hong Kong Polytechnic University | Lu L.,Hong Kong Polytechnic University | Zhang W.,Hong Kong Polytechnic University | Cui P.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Cui P.,Shandong Jianzhu University
Applied Energy | Year: 2015

The effect of groundwater flow on the heat transfer performance of pile geothermal heat exchanger (PGHE) with spiral coils was simulated by a 3-D simulation model using finite element method. Different groundwater flow conditions were taken into consideration by applying different hydraulic gradients. Based on the moving ring-coils model and simulation results, an improved analytical model is developed by introducing a key parameter of effective dimensionless velocity. The calculation results shows that the improved model can better describe the heat transfer performance of PGHE with spiral coils. Both numerical and analytical results indicated that the groundwater flow has an enhancing effect on the heat transfer performance of the PGHE with spiral coils and can accelerate the heat transfer process into stability. When the groundwater flow mean velocity equal to 6.98E-06. m/s, the amount of heat exchange is higher than 26.72% than it of non-advection situation. The improved ring-coils analytical model can be used as a reliable tool for the design of pile geothermal heat exchanger with spiral coils under groundwater flow. © 2015 Elsevier Ltd.


Li M.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Li M.,Central South University | Li P.,Central South University | Chan V.,Nanyang Technological University | Lai A.C.K.,City University of Hong Kong
Applied Energy | Year: 2014

Heat transfer by borehole ground heat exchangers involves diverse time-space scales and thus imposes a significant challenge to geothermal engineers. In order to overcome this challenge, this paper develops an analytical full-scale model from the idea of matched asymptotic expansion. The full-scale model is a composite expression consisting of a composite-medium line-source solution (inner solution), a finite line-source solution (outer solution), and an infinite line-source solution. The full-scale model is first verified by a frequency-decomposition method. Furthermore, the full-scale model is reformulated as a multi-stage model based on Duhamel's theorem to reduce the computational cost. The multi-stage model combines the three separate solutions in a sequential way, i.e., the inner solution for the short-time scale, the conventional infinite line-source solution for the intermediate time scale, and the outer solution for the long-time scale. Finally, we perform a parametric study on a ground heat exchanger with single U-shaped tube, by which the spacing between U-tube legs, the length-to-radius ratio of borehole, the ratios of thermal diffusivities and conductivities of the ground and backfilling material are analyzed. © 2014 Elsevier Ltd.


Li H.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Liu F.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Duan P.,Shandong Key Laboratory of Building Energy saving Technique
Chinese Control Conference, CCC | Year: 2016

The Ground Source Heat Pump (GSHP) module provided by Transient System Simulation Program (TRNSYS) simulation software will lead to wrong simulation results on partial load, which is only suitable for full load operation. In order to solve this problem, a new mathematical model of GSHP is established based on the experience knowledge of GSHP and the sample data provided by manufacturer. Firstly, the cooling capacity and energy consumption of a GSHP are analyzed according to the GSHP principle. Then, the Cerebellar Model Articulation Controller (CMAC) mathematical models of cooling capacity correction coefficient and power correction coefficient on full load are established according to the sample data provided by manufacturer, and the mathematical model of power correction factor on partial load is established based on the nonlinear regression model. Finally, the Coefficient of Performance (COP) of a GSHP and the outlet temperature of condenser are calculated according to the GSHP principle. Experimental results show that the accuracy of the CMAC mathematical models of cooling capacity correction coefficient and power correction coefficient on full load are better than that of the conventional multivariate nonlinear regression model. The developed GSHP mathematical model can be used to simulate the GSHP system very well. © 2016 TCCT.


Qian H.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Qian H.,Shandong Key Laboratory of Building Energy saving Technique | Wang C.,China University of Petroleum - Beijing
Applied Mechanics and Materials | Year: 2011

Experiments have been performed to observe flow pattern and investigate convective heat transfer for air-water vertical flow in a forced circulation system. The bubbles motion was recorded by a high-speed CCD camera. For the bubble and slug flow pattern, the temperature fluctuation signals and local heat transfer coefficients were obtained in a short heated tube. The probability density function classical was applied to analyze the temperature. The results qualitatively reflected characteristics of local heat transfer in two phase flow comparing with that in single-phase liquid. The comparison revealed that the gas phase could enhance the heat transfer. © (2011) Trans Tech Publications.

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