Proposal of bypass in heat recovery system with sucking air

Siažik, Ján; Malcho, Milan; Rezničák, Štefan

doi:10.1063/1.4953748

Cited by 1 publication

(2 citation statements)

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“…The generally accepted logic of solving the formulated problem leads to the replenishment of conservation laws with models of elements [6,7], [8] and iterative schemes for its solution [9,10], [11]. The disadvantages of this approach are well known (see, for example, [15]).…”

Section: Analysis Of the Bypass Connection Modelmentioning

confidence: 99%

“…A neural network intelligent control is proposed for a network of heat exchangers based on a lumped model and accepted constraints. The design of heat exchange systems is also associated with the provision of HEN flow control capabilities in the heat exchanger network, and bypass manipulation provides higher dynamic characteristics of the system [8], as well as increased reliability in the event of equipment failure [9]. Ease of maintaining the flow temperature in the network, changing the outlet flow in the network at set values or changing the outlet flow for new target values is achieved by adjusting the bypass flow in some or all of the heat exchangers [10].…”

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confidence: 99%

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Improving the designing method of thermal networks: bypass connection

Derevyanko¹,

Mescheryakov²

2021

AAIT

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The paper presents the results of the development of a model of a heat exchange system with a bypass connection of flows. An analytical model of a bypass for two heat exchange elements in the form of a relationship between the temperature ratio differences of flows and efficiency has been developed. The resulting expression for the efficiency of energy exchange in the system depends on the distribution of elements and flows at the entrance to the system and does not depend on the distribution in the mixing unit. It is shown that the key factor determining both the operation of the designed system and its elements is the correspondence of the direction of the processes in the real system with their direction, hypothetically chosen by the designer when specifying its topology. The distribution of the energy potential dictates the conditions for the operability of the system and its elements through the uncertainty of the values of the average energy measures. The statement of the problem of determining the matrix elements that satisfy the requirement of the minimum uncertainty of the average energy measures leads to the determination of the distribution of the efficiency of the system elements in its topological representation in accordance with the requirements of the second law of thermodynamics. The formulated requirements for the minimality of the uncertainty of the average energy measures and the construction, based on the Shannon principle, make it possible to obtain a solution to the formulated problem as a finite subset of the values of the efficiency of the inter-network and intra-network energy exchange. In addition, the extremeness of solutions (minimum uncertainty of average energy measures) ensures the maximum efficiency of energy transfer from the “hot” network to the “cold” network in its elements and the minimum energy dissipation in the mixing nodes. The urgency of the topic is due to the fundamental need to reduce energy costs of systems. The applied aspect is to minimize the mass, dimensions and energy component in enterprises where thermal transformations are significant.

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