Research on matching design method of waste heat reuse system of fuel cell vehicle considering system energy consumption and waste heat exchange rate

2020 ◽  
Author(s):  
Wei Sun ◽  
Fengyan Yi ◽  
Donghai Hu ◽  
Jiaming Zhou
Keyword(s):  
Exchange Rate ◽  
Energy Consumption ◽  
Heat Exchange ◽  
Waste Heat ◽  
Design Method ◽  
Fuel Cell Vehicle ◽  
Waste Heat Reuse ◽  
System Energy ◽  
Reuse System ◽  
Matching Design

scholarly journals Minimization of the Energy Consumption in Industrial Robots through Regenerative Drives and Optimally Designed Compliant Elements

2020 ◽  
Vol 10 (21) ◽  
pp. 7475
Author(s):  
Ilaria Palomba ◽  
Erich Wehrle ◽  
Giovanni Carabin ◽  
Renato Vidoni
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Design Method ◽  
Electrical Energy ◽  
Motor Drives ◽  
Industrial Robots ◽  
Test Cases ◽  
Electrically Actuated ◽  
System Energy ◽  
The Relationship

This paper describes a method for reducing the energy consumption of industrial robots and electrically actuated mechanisms performing cyclic tasks. The energy required by the system is reduced by outfitting it with additional devices able to store and recuperate energy, namely, compliant elements coupled in parallel with axles and regenerative motor drives. Starting from the electromechanical model of the modified system moving following a predefined periodic path, the relationship between the electrical energy and the stiffness and preload of the compliant elements is analyzed. The conditions for the compliant elements to be optimal are analytically derived. It is demonstrated that under these conditions the compliant elements are always beneficial for reducing the energy consumption. The effectiveness of the design method is verified by applying it to two test cases: a five-bar mechanism and a SCARA robot. The numerical validations show that the system energy consumption can be reduced up to the 77.8% while performing a high-speed, standard, not-optimized trajectory.

The Energy Consumption Investigation of the Hotel Central Air-Conditioning System and the Research of Energy Saving Measures

2013 ◽  
Vol 712-715 ◽  
pp. 1614-1618
Author(s):  
Jia Jia Ni ◽  
Li Tao ◽  
Yi Jun Wang ◽  
Jin Lei Wu
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Waste Heat ◽  
Frequency Control ◽  
Building Envelope ◽  
Air Conditioning System ◽  
Central Air Conditioning ◽  
Energy Saving Technology ◽  
System Energy

Through to investigation on present situation of the Changzhou Changrui Hotel air conditioning system energy consumption, by analysis the energy consumption, the power consumption of hotel central air-conditioning system charge 58% of the total electric, accounted for a large proportion. So we should take the necessary measures to reduce the expenses of air conditioning system energy consumption. According to the analysis of data on the survey, we put forward some particular energy-saving measures of central air-conditioning system of the hotel, including strengthening the building envelope insulation, energy saving technology of doors and windows, measures of roof energy saving, setting reasonable indoor temperature, adopting frequency control air-conditioning, reuse waste heat of the central air-conditioning, using the condensation water of central air conditioning to make-up water and reducing temperature of cooling tower , and drying the fresh air independently.

scholarly journals Design Method for Cast-in-place Energy Pile Considering Equivalent Heat Exchange Rate

2013 ◽  
Vol 33 (3) ◽  
pp. 1049-1061
Author(s):  
Sunhong Min ◽  
Sangwoo Park ◽  
Kyoungsik Jung ◽  
Hangseok Choi
Keyword(s):  
Exchange Rate ◽  
Heat Exchange ◽  
Design Method ◽  
Energy Pile

scholarly journals Reducing the metabolic energy of walking and running using an unpowered hip exoskeleton

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Tiancheng Zhou ◽  
Caihua Xiong ◽  
Juanjuan Zhang ◽  
Di Hu ◽  
Wenbin Chen ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Design Method ◽  
Metabolic Cost ◽  
Metabolic Energy ◽  
Spring Stiffness ◽  
Spatiotemporal Parameters ◽  
The Common ◽  
Hip Flexion ◽  
Optimal Stiffness ◽  
Insight Into

Abstract Background Walking and running are the most common means of locomotion in human daily life. People have made advances in developing separate exoskeletons to reduce the metabolic rate of walking or running. However, the combined requirements of overcoming the fundamental biomechanical differences between the two gaits and minimizing the metabolic penalty of the exoskeleton mass make it challenging to develop an exoskeleton that can reduce the metabolic energy during both gaits. Here we show that the metabolic energy of both walking and running can be reduced by regulating the metabolic energy of hip flexion during the common energy consumption period of the two gaits using an unpowered hip exoskeleton. Methods We analyzed the metabolic rates, muscle activities and spatiotemporal parameters of 9 healthy subjects (mean ± s.t.d; 24.9 ± 3.7 years, 66.9 ± 8.7 kg, 1.76 ± 0.05 m) walking on a treadmill at a speed of 1.5 m s−1 and running at a speed of 2.5 m s−1 with different spring stiffnesses. After obtaining the optimal spring stiffness, we recruited the participants to walk and run with the assistance from a spring with optimal stiffness at different speeds to demonstrate the generality of the proposed approach. Results We found that the common optimal exoskeleton spring stiffness for walking and running was 83 Nm Rad−1, corresponding to 7.2% ± 1.2% (mean ± s.e.m, paired t-test p < 0.01) and 6.8% ± 1.0% (p < 0.01) metabolic reductions compared to walking and running without exoskeleton. The metabolic energy within the tested speed range can be reduced with the assistance except for low-speed walking (1.0 m s−1). Participants showed different changes in muscle activities with the assistance of the proposed exoskeleton. Conclusions This paper first demonstrates that the metabolic cost of walking and running can be reduced using an unpowered hip exoskeleton to regulate the metabolic energy of hip flexion. The design method based on analyzing the common energy consumption characteristics between gaits may inspire future exoskeletons that assist multiple gaits. The results of different changes in muscle activities provide new insight into human response to the same assistive principle for different gaits (walking and running).

scholarly journals Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1893
Author(s):  
Kwonye Kim ◽  
Jaemin Kim ◽  
Yujin Nam ◽  
Euyjoon Lee ◽  
Eunchul Kang ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Pump System ◽  
Heat Pump System ◽  
Scale Experiment ◽  
Real Scale

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

Evaluation of heat exchange rate of GHE in geothermal heat pump systems

2009 ◽  
Vol 34 (12) ◽  
pp. 2898-2904 ◽  
Author(s):  
Liu Jun ◽  
Zhang Xu ◽  
Gao Jun ◽  
Yang Jie
Keyword(s):  
Exchange Rate ◽  
Heat Exchange ◽  
Heat Pump ◽  
Geothermal Heat ◽  
Geothermal Heat Pump

Energy Consumption Analysis of Ship Energy System

2014 ◽  
Vol 962-965 ◽  
pp. 1836-1839
Author(s):  
Yong Ren ◽  
Zhen Ying Mu ◽  
Hong Tao Zheng ◽  
Shi Chen
Keyword(s):  
Energy Consumption ◽  
Recovery Rate ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Energy System ◽  
Loss Ratio ◽  
Energy Consumption Analysis ◽  
Performance Indexes ◽  
Analysis Models

Energy consumption analysis models of ship energy system were established. The performance indexes, such as energy loss ratio, waste heat recovery rate and waste heat recovery perfect degree were defined. A 70000 - ton crude oil carrier was taken as an example for energy consumption analysis. The results show that the waste heat recovery rate of exhaust smoke was 15.69%, and the waste heat recovery perfect degree was 52.76%.

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