Energy consumption in greenhouses and selection of an optimized heating system with minimum energy consumption

2019 ◽  
Vol 48 (7) ◽  
pp. 3257-3277 ◽  
Author(s):  
Seyed Alireza Mostafavi ◽  
Ali Rezaei
Keyword(s):  
Energy Consumption ◽  
Minimum Energy ◽  
Heating System ◽  
Minimum Energy Consumption ◽  
Selection Of

Cylinder Valves Reliability and Performance in Booster-Primary Compressors

2011 ◽  
Author(s):  
Enzo Giacomelli ◽  
Massimo Schiavone ◽  
Claudio Vaglini
Keyword(s):  
Energy Consumption ◽  
Mechanical Behaviour ◽  
High Efficiency ◽  
Minimum Energy ◽  
Lubricating Oil ◽  
Minimum Energy Consumption ◽  
And Performance ◽  
Wide Operating ◽  
Careful Design ◽  
Selection Of

The production of LDPE, in addition to the hyper-compressors, requires heavy-duty Booster and Primary compressors. Although operating at lower pressures, Booster-Primary units are complex machines, considering the need of wide operating range and capacity control, due to the different products often required by the plants. They are able to give an appreciable contribution to the operational results. Their cylinder valves, as critical parts need a careful design, that will be important for adequate operation, considering the aspects of Safety, Performance and Reliability. The aim of high efficiency is obtained by the use of methodologies, able to optimize the geometry and positively affecting the energy consumption. Similar advances are used for the strength of the components operating under fatigue stresses, like in the case of seats and rings or plates. The operating results both from energy consumption and mechanical behaviour are consequence of proper simulations. Mathematical models optimize performance and ensure reliable operation, to reach a correct mechanical behaviour with minimum energy consumption of the valves. Also the pulsation can be investigated in case the situation is considered critical for the plant. The selection of the valves, ring or plate type, can be significant as they have a different performance as a function of the lubricating oil quantity and viscosity.

scholarly journals Research on the Construction of an e-Commerce Marketing System Based on the Wireless Sensor Network

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Chi Zhang
Keyword(s):  
Energy Consumption ◽  
Wireless Sensor Network ◽  
Sensor Network ◽  
Minimum Energy ◽  
Cluster Head ◽  
Hardware Design ◽  
Wireless Sensor ◽  
Marketing System ◽  
Minimum Energy Consumption ◽  
Selection Of

This paper takes e-commerce as the research object, based on the combination of wireless sensor network research results, using relevant theoretical analysis tools to identify several major problems in the marketing of enterprises. Then, the internal environment conditions of developing e-commerce are comprehensively analyzed through human resources, financial resources, marketing ability, and platform building ability, and the advantages and disadvantages of the enterprise itself are presented in a three-dimensional manner to help the enterprise understand its situation. Firstly, the overall hardware structure design of this paper is analyzed, and the network marketing node hardware design is proposed as the core of the system hardware design, and the marketing node hardware design circuit diagram is given through the selection of marketing node sensors, the selection of wireless communication modules, and the selection of marketing node microprocessors. Based on the specific application of the wireless sensor network in the e-commerce marketing system, the number of cluster selection is reduced by calculating and setting the remaining energy threshold of the cluster head for the whole network. The optimal cluster head is searched for based on the density of marketing nodes in different regions and the minimum energy consumption of the cluster after the division of the region within the cluster, and the original cluster head is replaced; the density of marketing nodes in different e-commerce is different, and the optimal number of cluster heads is searched for based on the minimum energy consumption of the network. In summary, three strategies are implemented to improve the design of wireless sensor network routing, and the effectiveness of the algorithm is verified through experimental simulation. Through the analysis of e-commerce operation, the intracluster congestion control is achieved by a dual-cluster head strategy with intracluster push selection of subcluster heads; the network nonuniform hierarchy and resource scheduling strategy achieve intercluster congestion mitigation and decongestion. A minimum energy consumption multihop path tree is also proposed here, which can achieve the lowest energy consumption of marketing nodes and networks and improve the link quality relative to other transmission paths. After simulation experiments, the effectiveness and reliability of the congestion algorithm are verified. A guarantee scheme is provided for the development of e-commerce marketing strategies to help breakthroughs and developments in marketing management, and an attempt is also made to provide a template for other enterprises to follow.

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