Description de 3 algorithmes d'ordinateurs developpes pour le calcul des performances des tours de refroidissement, des refroidisseurs de fluide par evaporation et des condenseurs a evaporation disponibles sur le marche. Analyse de cas pour chacun des 3 types d'echangeurs

Performance simulation of evaporative heat exchangers-(cooling towers, fluid coolers and condensers)

TEC1-12705 and TEC1-12706 two types of semiconductor refrigeration chips were designed with different hot-end heat dissipation conditions. At the same time, a test device for heat dissipation of heat pipes for heat sinks with separate current input and two-stage refrigeration was designed, and the influence of hot-end heat dissipation conditions on cold-end temperature was analyzed. The test results show that the cold terminal temperature of the semiconductor refrigeration sheet is related to the heat dissipation capacity of the hot terminal. Under the condition of limited heat dissipation capacity, the cold terminal temperature decreases first and then increases with the increase of the input current; and under the condition of ensuring the heat dissipation capacity, the cold terminal temperature decreases with the increase of the input current and decreases with the decrease of the hot terminal temperature. The two-piece TEC1-12706 semiconductor refrigeration sheet adopts two-stage refrigeration with separate current input, and the minimum temperature of the cold terminal can reach −36,8°С. The test results show that improving the heat dissipation conditions of the hot end can improve the performance of a single semiconductor refrigeration sheet. At the same time, under the best heat dissipation conditions, the use of separate current input two-stage refrigeration can greatly reduce the temperature of the cold end, which is of great significance to improve the working temperature difference of the semiconductor refrigeration sheet.

Experimental Research on Heat Dissipation at the Hot End of Semiconductor Refrigeration Chips

Experimental and Theoretical Study of an Underground Non-Typical Cooling Tower

Advances in research for underground buildings: Energy, thermal comfort and indoor air quality

In order to solve the ‘condensation heat excess’ problem for protective underground engineering, a new condensation heat processing schema was proposed, which is based on the theoretical analysis results that the condensation heat should be transferred to the exotic environment. The main idea of the proposal is utilizing exhaust air of the ventilation system and applying evaporative heat transferring mode.

The Study of the Evaporative Condensation Heat Processing Schema Based on Utilization of the Exhaust Air

Whether the results of the dynamic heat flux from the underground engineering envelope are accurate, may influence the accuracy of calculating the transient heat load and could affect the initial cost and actual operation of the air-conditioning system in the underground engineering. The paper is to find out the mechanisms of the heat transfer in the underground engineering envelope. The mechanisms of heat transfer in normal underground engineering envelope, simplified calculation for heat transfer in the underground engineering envelope and the dynamic emulation of the heat load of the underground engineering envelope.

The Systems Emulation Study of the Dynamic Heat Load for Underground Structure Envelope

Based on experimental platform of the evaporative cooling system and a large number of experimental data, the influence of air relative humidity and dry bulb temperature on the energy consumption ratio (ECR) of the evaporative condenser is studied. Resorting to the test data, linear, quadratic and cubic fitting surfaces are used to get the function of energy consumption ratio with two variables, dry bulb temperature and relative humidity. The fitting and validation results show that the quadratic surface approaches the real data best among the three manners.

Experimental Study on Effect of Meteorologic Parameters on Evaporative Cooling System Performance

Concerning the salient features of components energy consumption model in air conditioning system, this paper proposes a half-online identification algorithm to estimate the parameters of the models. The algorithm monitors the error online. When the error reaches the upper limit, one-time least square estimation is used to identify the parameter and update the model by means of current data within a certain time window. Experimental studies are conducted on a fan energy consumption model, which parameters are varying in real time. The estimation results show that the algorithm can greatly reduce the computational burden and possession of resources, while ensure good estimation performance.

Half-Online Identification Algorithm for Parameter Estimation of Fan Energy Consumption Model

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Papers

The Study of the Evaporative Condensation Heat Processing Schema Based on Utilization of the Exhaust Air

The Systems Emulation Study of the Dynamic Heat Load for Underground Structure Envelope

Experimental Study on Effect of Meteorologic Parameters on Evaporative Cooling System Performance

Half-Online Identification Algorithm for Parameter Estimation of Fan Energy Consumption Model