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Energy efficiency evaluation method for current heat exchanger and heat exchange network formed by the same

A heat exchange network and evaluation method technology, which is applied in the field of energy efficiency evaluation of heat exchange networks in industrial enterprises, can solve the problems of being unable to keep up with the situation and considering the energy efficiency level of heat exchange networks at the system level, and achieve the effect of lowering the technical threshold

Inactive Publication Date: 2019-06-14
浙江宏纪能源环境科技有限公司
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Problems solved by technology

In the past, the energy efficiency index evaluation method of a single heat exchanger based on the first law of thermodynamics did not consider the energy efficiency level of the heat exchange network from the system level, and it has been unable to keep up with the situation

Method used

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  • Energy efficiency evaluation method for current heat exchanger and heat exchange network formed by the same
  • Energy efficiency evaluation method for current heat exchanger and heat exchange network formed by the same
  • Energy efficiency evaluation method for current heat exchanger and heat exchange network formed by the same

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] This embodiment relates to an energy efficiency evaluation method of an existing heat exchanger and the heat exchange network formed therein.

[0027] The operation flow of the energy efficiency evaluation method combined with the current heat exchange network diagram figure 1 , the specific implementation steps are as follows:

[0028] Step 1. Obtain the basic information of the basic composition of the heat exchange network, the inlet and outlet temperatures of the hot and cold fluids, the mass flow rate, and the specific heat capacity at constant pressure;

[0029] The inlet and outlet temperatures of hot and cold fluids, mass flow rate and specific heat capacity at constant pressure are obtained by direct measurement, and then the corresponding heat capacity flow rate is calculated by multiplying the mass flow rate by the specific heat capaci...

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Abstract

The invention discloses an energy efficiency evaluation method for a current heat exchanger and a heat exchange network formed by the same, comprising the following steps: step one, obtaining basic information of basic constitution of the heat exchange network, cold and hot fluid inlet and outlet temperature, mass flow and constant-pressure specific heat capacity; step two, using exergy efficiencyand heat transfer validity to evaluate the energy efficiency level of a single heat exchanger; and step three, judging whether the heat exchange network belongs to a clamp point or a threshold valueproblem, indicating the problem of the current heat exchange network, and calculating the potential energy efficiency improvement rate of the current heat exchange network. According to the method inthe invention, the energy grade of the cold and hot energy flow in the heat exchange network is comprehensively considered from the system, and the overall energy efficiency level of the heat exchangenetwork can be evaluated through calculation and analysis only according to the cold and hot fluid inlet and outlet temperature of the heat exchanger.

Description

technical field [0001] The invention relates to the field of energy efficiency evaluation of heat exchange networks of industrial enterprises, in particular to an energy efficiency evaluation method of an existing heat exchanger and the formed heat exchange network. Background technique [0002] In industrial production, heat exchangers are the main equipment for energy (heat) exchange. With the deepening of energy conservation and emission reduction work, higher and higher requirements are put forward for heat exchangers. At the same time, the energy efficiency evaluation methods of heat exchangers are also proposed. higher requirements. In the past, the energy efficiency index evaluation method of a single heat exchanger based on the first law of thermodynamics did not consider the energy efficiency level of the heat exchange network from the system level, and it has been unable to keep up with the situation. It is necessary to propose a new evaluation method that combine...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 李威苑京成胡长兴
Owner 浙江宏纪能源环境科技有限公司
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