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Calculation method of unsteady-state radiant heat transfer load for stratified air-conditioning in large space buildings

A layered air-conditioning and load transfer technology, which is applied in calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of calculation result error, non-compliance with requirements, neglect of reflection and absorption, etc.

Active Publication Date: 2021-07-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] (1) The direct radiation model is used in the calculation of radiation heat transfer, that is, only the direct radiation part is considered when calculating the radiation heat transfer between the wall surface of the non-air-conditioned area and the wall surface of the air-conditioned area, and the reflection absorption is ignored, and there are certain errors in the calculation results;
[0029] (2) Multiply the heat gain correction coefficient C of the air-conditioned area by the radiation heat transfer from the wall of the non-air-conditioned area to the floor of the air-conditioned area 1 (take 1.3) to determine the radiation transfer heat from the entire non-air-conditioned area to the air-conditioned area. The heat gain correction coefficient has nothing to do with parameters such as layer height, which is obviously unreasonable, so this coefficient is not universal;
[0031] (4) The cooling load is determined by using the cooling load coefficient as a constant, which does not meet the modern requirements for unsteady load calculation

Method used

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  • Calculation method of unsteady-state radiant heat transfer load for stratified air-conditioning in large space buildings
  • Calculation method of unsteady-state radiant heat transfer load for stratified air-conditioning in large space buildings
  • Calculation method of unsteady-state radiant heat transfer load for stratified air-conditioning in large space buildings

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Embodiment 1

[0058] The first embodiment provides a complete calculation method for the unsteady radiation heat transfer load of the layered air conditioner in a large-space building. In this complete calculation method, the hourly temperature of the inner wall surface of the enclosure structure in the non-air-conditioned area and the air-conditioned area due to the outdoor periodic disturbance is first calculated, and the heat storage characteristics of the enclosure structure are considered by using the harmonic response method during calculation; Then calculate the hourly wall radiative heat transfer between each wall surface in the non-air-conditioned area and between each wall surface in the air-conditioned area according to the hourly inner wall temperature. In the calculation, the Gebhart radiation model (considering direct radiation absorption and primary reflection absorption) is used instead of the direct radiation model. Calculation; then according to the hourly solar radiation i...

Embodiment 2

[0172] In order to facilitate the engineering calculation, the second embodiment provides a simplified engineering calculation method for the unsteady radiation heat transfer load of the layered air conditioner in a large-space building. It first calculates the hourly inner wall temperature, the calculation process of the hourly inner wall temperature is consistent with the complete calculation method in Example 1: secondly, the hourly wall radiant heat of each wall in the non-air-conditioned area to the ground in the air-conditioned area is calculated by using the direct radiation model The transfer amount and the hourly solar radiation heat transfer amount from each external window in the non-air-conditioned area to the ground in the air-conditioned area; then the coefficient C is corrected according to the corresponding model 0 Value, heat gain correction coefficient C of wall air-conditioning area 1a value, solar air-conditioning zone heat gain correction coefficient C 1b...

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Abstract

The present invention provides a method for calculating the unsteady-state radiant heat transfer load of stratified air-conditioning in large-space buildings, which is used for unsteady-state calculation of the radiant heat transfer load from non-air-conditioned areas to air-conditioned areas in the stratified air-conditioning loads of large-space buildings, thereby To solve the problem that the radiation heat transfer load can only be calculated in a steady state and the calculation is inaccurate in the design of layered air conditioners, it is characterized in that it includes the following steps: Step S1, fitting the hourly comprehensive temperature of outdoor air, and calculating the comprehensive temperature of outdoor air step by step The time-varying expansion is in the form of Fourier series; step S2, calculate the hourly inner wall temperature; step S3, calculate the hourly radiation heat transfer amount; step S4, fit the hourly radiation heat transfer amount; step S5: Calculates unsteady radiative heat transfer loads.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning load calculation in large-space buildings, and in particular relates to a calculation method for unsteady-state radiation heat transfer load of layered air-conditioning in large-space buildings. Background technique [0002] In order to reduce building energy consumption and improve indoor air quality, stratified air conditioning is often used in large space buildings. Layered air-conditioning refers to the air-conditioning method that only air-conditions the lower part of the large-space building and does not perform air-conditioning on the upper space. Therefore, in large-space buildings, the stratified air-conditioning load refers to the load that is only responsible for the air-conditioning in the lower air-conditioning area. The stratified air-conditioning load is the basis for determining the cooling capacity provided by the air-conditioning system to the room, and it is also the ke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20G06F119/08
CPCG06F30/13G06F30/20
Inventor 黄晨苗宇峰俞玲吕留根乔梁王昕李瑞彬悦靖
Owner UNIV OF SHANGHAI FOR SCI & TECH