Experimental Analysis of Micro-CHP Based on Biomass Direct-Fired Stirling Engine

2012 ◽  
Vol 151 ◽  
pp. 36-40
Author(s):  
Da Guo Ma ◽  
Xin Bo Jiang ◽  
Xu Zhang ◽  
Yan Ma
Keyword(s):  
Energy Use ◽  
Engine Speed ◽  
Stirling Engine ◽  
Biomass Energy ◽  
Working Process ◽  
Charge Voltage ◽  
Thermal Energy Conversion ◽  
Energy Conversion Process ◽  
Working Principle ◽  
Use Efficiency

The working principle of the micro-CHP based on biomass direct-fired Stirling engine and the thermal energy conversion process of the biomass direct-fired fuels were analyzed. On the basis of analysis, a 1kW β-type Stirling generator was designed and constructed for lab tests. Then, experiments were carried out to evaluate the effectiveness of the prototype. Through the analysis of experimental data and simulation, the change law of charge voltage, charge current with the engine speed and pressure, as well as the relation of heat and electricity, the power generation efficiency and the overall efficiency of the thermoelectric in the working process was obtained. The results showed that biomass energy use efficiency will be improved through the use of micro-CHP based on biomass direct-fired Stirling engine.

Simulation on the Biomass Direct-Fired Stirling Engine

2010 ◽  
Vol 450 ◽  
pp. 55-58
Author(s):  
Xu Zhang ◽  
Yan Ma ◽  
Jie Zang ◽  
Tie Chen ◽  
Jing Yin ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Simulation Software ◽  
Stirling Engine ◽  
Biomass Energy ◽  
Design And Optimization ◽  
Simulink Simulation ◽  
New Period ◽  
Working Principle ◽  
The New Period ◽  
Swept Volume

The theoretical analysis of the working principle of the β-type Stirling engine was carried out. According to the constraints of their mathematical model, an analysis was made through the MATLAB/Simulink simulation software, and the simulated curves are generated under the different parameters which were used to compare and research. The results show that the output power and the pressure of the cylinder change with the different pressure, temperature, swept volume and the cylinder volume, and which reflect the influencing factors of the power. The simulation gives an intuitive theoretical basis for the design and optimization of the direct-fired biomass Stirling engine, and points out the direction of the development of the biomass energy in the new period.

scholarly journals Canopy Size and Light Use Efficiency Explain Growth Differences between Lettuce and Mizuna in Vertical Farms

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 704
Author(s):  
Theekshana C. Jayalath ◽  
Marc W. van Iersel
Keyword(s):  
Energy Use ◽  
Incident Light ◽  
Dry Weight ◽  
Biomass Energy ◽  
Photon Flux ◽  
Light Use Efficiency ◽  
Growing Period ◽  
Use Efficiency ◽  
High Yields ◽  
Canopy Size

Vertical farming is increasingly popular due to high yields obtained from a small land area. However, the energy cost associated with lighting of vertical farms is high. To reduce this cost, more energy efficient (biomass/energy use) crops are required. To understand how efficiently crops use light energy to produce biomass, we determined the morphological and physiological differences between mizuna (Brassica rapa var. japonica) and lettuce (Lactuca sativa ‘Green Salad Bowl’). To do so, we measured the projected canopy size (PCS, a morphological measure) of the plants throughout the growing cycle to determine the total amount of incident light the plants received. Total incident light was used together with the final dry weight to calculate the light use efficiency (LUE, g of dry weight/mol of incident light), a physiological measure. Plants were grown under six photosynthetic photon flux densities (PPFD), from 50 to 425 µmol m–2 s–1, for 16 h d–1. Mizuna and lettuce were harvested 27 and 28 days after seeding, respectively. Mizuna had greater dry weight than lettuce (P < 0.0001), especially at higher PPFDs (PPFD ≥ 125 µmol m–2 s–1), partly because of differences in the projected canopy size (PCS). Mizuna had greater PCS than lettuce at PPFDs ≥ 125 µmol m–2 s–1 and therefore, the total incident light over the growing period was also greater. Mizuna also had a higher LUE than lettuce at all six PPFDs. This difference in LUE was associated with higher chlorophyll content index and higher quantum yield of photosystem II in mizuna. The combined effects of these two factors resulted in higher photosynthetic rates in mizuna than in lettuce (P = 0.01). In conclusion, the faster growth of mizuna is the result of both a larger PCS and higher LUE compared to lettuce. Understanding the basic determinants of crop growth is important when screening for rapidly growing crops and increasing the efficiency of vertical farms.

PERFORMANCE OF SMALL CAPACITY SOLAR PUMP IN EASTERN REGION OF INDIA

2020 ◽  
Vol 7 (01) ◽  
Author(s):  
ATIQUR RAHMAN
Keyword(s):  
Energy Use ◽  
Pressure Head ◽  
Eastern Region ◽  
Groundwater Abstraction ◽  
Annual Fluctuation ◽  
Fuel Prices ◽  
Delivery Pressure ◽  
Current Scenario ◽  
Use Efficiency ◽  
Solar Pump

Solar energy use for groundwater abstraction is one of the most viable options for smallholders’ irrigation in current scenario of increasing fuel prices. Therefore, the dissemination and adoption of solar pumps of low capacities among these farmers is in demand. In this paper a case study was in eastern region to assess the performance of 3horsepower solar pump, as this capacity pump is currently being promoted by the governments to small farmers at subsidised rates. In eastern region where groundwater regime in most of the area is ranging5-10 m bgl with annual fluctuation of ±2 to ±4 m, and abstracted groundwater by a 3 horsepower solar pumpis rangedfrom 100-173 m3/day, depending upon the months on a bright day. Thispump also offers a delivery pressure head 1.0- 1.5 kg/cm2, and therefore facilitates pressured irrigation for improved water use efficiency.

scholarly journals Estimation of Ocean Thermal Energy Conversion Resources in the East of Malaysia

2020 ◽  
Vol 9 (1) ◽  
pp. 22
Author(s):  
Sathiabama T. T. Thirugnana ◽  
Abu Bakar Jaafar ◽  
Takeshi Yasunaga ◽  
Tsutomu Nakaoka ◽  
Yasuyuki Ikegami ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Energy Conversion ◽  
Thermal Energy ◽  
Biomass Energy ◽  
Relative Depth ◽  
Solar Pv ◽  
Ocean Thermal Energy Conversion ◽  
Thermal Energy Conversion ◽  
Oceanographic Data ◽  
Ocean Thermal Energy

The Malaysian Government has set a target of achieving 20% penetration of Renewable Energy (RE) in the energy mix spectrum by 2025. In order to get closer to the target, Ocean Thermal Energy Conversion (OTEC) aligned with solar PV, biogas and biomass energy sources must be evaluated and comprehended. Hybrid OTEC systems consisting of energy and water production are currently under research and validation. Therefore, for the construction of a commercial OTEC plant, 1 MW or 2.5 MW, the choice of a strategic location or potential site is vital. In this paper, oceanographic data such as seawater temperature, depth, salinity and dissolved oxygen obtained from the Japan Oceanographic Data Center (JODC) for Semporna, Tawau, Kudat, Pulau Layang-Layang and Pulau Kalumpang in Sabah, Malaysia, are reported. The RE available from the Exclusive Economic Zone (EEZ) on the coast of Sabah was estimated based on the JODC data obtained. There were no remarkable differences in temperatures between the five sites, which were reported as approximately 27 °C at the surface and 7 °C at depths below 600 m. The surface salinities below 100 m at those sites were slightly lower than the deeper waters, where the salinity increased up to approximately 34.5 PSU. Dissolved oxygen data from the Pulau Kalumpang site showed a slight increment to approximately 4.7 mL/L at depth intervals below 50 m, before declining steadily to approximately 1.7 mL/L along with the depth. The temperature-salinity profiles of the Malaysian sites were congruent with those of Palau, Kumejima and Okinawa, but not with that of Fiji, where the salinity profile showed a distinct variation at the relative depth (below 200 m). Estimates of RE using two different methods were used to prove the potential of OTEC in Malaysia.

DEVELOPMENT OF A KNOWLEDGE-BASED INTELLIGENT CAD SYSTEM FOR AUTOMOTIVE PANEL DIE

2008 ◽  
Vol 07 (01) ◽  
pp. 51-54 ◽  
Author(s):  
HUI-XIA LIU ◽  
WEI WEI ◽  
XIAO WANG ◽  
LAN CAI
Keyword(s):  
Die Design ◽  
Design System ◽  
Working Process ◽  
Cad System ◽  
Knowledge Based ◽  
Working Principle ◽  
Panel Die ◽  
Automotive Panels ◽  
Automotive Panel

A knowledge-based intelligent die design system for automotive panels is developed by UG software platform. This system can accomplish design intelligently and automatically through engineering rules in the knowledge base. The framework and implementation of the system are discussed. Finally, a case study of the panel die design of car trunk in the system is implemented, which illustrates working process, working principle, implement method and practicability of the system, and validates the advanced design conception proposed in this paper.

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