CN105115348B - It is a kind of can be with Yu Haiyang increasing the turning device of heat transfer - Google Patents

Abstract

A flipping device that can be used in the sea to increase heat conduction relates to a heat conduction device. Provide an inversion device that can be used in oceans to increase heat conduction, which can effectively improve the effective thermal properties relative to its own intrinsic value, and increase the heat transfer efficiency. A high-temperature heat store, a low-temperature heat store, a long rod system and a fixed shaft are provided; one end of the long rod system is connected with a high-temperature heat store to heat the long rod system, and the other end of the long rod system is connected with a low-temperature heat store to make the long rod system The rod system is cooled, the center of the long rod system is fixed on the fixed shaft, the long rod system is turned over and the two ends of the long rod system are continuously switched between the high temperature heat store and the low temperature heat store. In order to control and optimize the effective thermal conductivity, the overturning operation is used to increase the total heat flow from the high-temperature heat store into the system, so that the heat transfer of the sample is faster when it is in contact with the heat store. The temperature difference between the ocean surface and the bottom can be used to achieve the effect of energy transmission, and the potential energy value of the ocean can be reasonably utilized.

Description

A flipping device that could be used in the ocean to increase heat transfer

technical field

The invention relates to a heat conduction device, in particular to a turning device which can be used in oceans to increase heat conduction.

Background technique

Heat conduction and heat convection are the mechanisms that almost cover the thermal properties of various energy-related devices, including two-stage thermal rectifiers whose thermal conductivity depends on temperature (Chang C.W., Okawa D., Majumdar A., et al. Solid-state thermal rectifier [J].Science,2006,314(5802):1121-1124), a thermal diode model combining two nonlinear one-dimensional lattices to obtain a wider range of system parameters (Li B.W., Wang L., Casati G.Thermaldiode: Rectification of heat flux[J].Physics Review Letter,2004,93(18):184301), a thermoelectric model that converts thermal energy into electrical energy (Rabari R., Mahmud S., Dutta A.Numericalsimulation of nanostructured thermoelectric generator considering surface tosurrounding convection[J].International Communications in Heat and MassTransfer,2014,56:146-151), photovoltaic devices that convert solar energy into electrical energy (Chow T.T.A review on photovoltaic/thermal hybrid solar technology[J].Applied Energy , 2010,87(2):365-379) and light-emitting diodes that convert electrical energy into heat and light (Gessmann T., Schubert E. High-efficiency AlGaInP light-emitting diodes for solid-state lighting applications[J].Journal of Applied Physics, 2004, 95(5):2203-2216).

Regarding the control and optimization of effective thermal conductivity, its application range is very wide, including micro-electromechanical systems, thermal signals, thermostat controllers, etc. Without changing the system parameters, we hope to achieve effective thermal management of the device by exploiting the transient behavior of the system. Yet another possible application of controlling the transient behavior is to increase the effective heat capacity of the system. Many devices have problems such as slow heat transfer and poor effect.

Contents of the invention

The purpose of the present invention is to solve the problems of slow heat transfer and poor effect in existing devices, and provide a device that can effectively improve the effective thermal properties relative to its own intrinsic value and increase the heat transfer efficiency, which can be used in oceans to increase Thermally conductive turning device.

The present invention is equipped with high-temperature thermal storage, low-temperature thermal storage, long rod system and fixed shaft;

One end of the long rod system is connected with a high-temperature heat store to heat the long rod system, and the other end of the long rod system is connected with a low-temperature heat store to cool the long rod system. The center of the long rod system is fixed on a fixed shaft, and the long rod system The system turns over and makes the two ends of the long rod system continuously switch between the high-temperature heat store and the low-temperature heat store.

The invention increases the heat flow from one end of the long rod system into the turning system through the turning system, so that its effective thermal conductivity and effective heat capacity can be greatly improved compared with the intrinsic value of the material itself; and a usable Based on the simple model of the ocean, the effect of the present invention is demonstrated by using the multi-physics field coupling analysis software COMSOL to simulate and assist. Based on energy conservation and Fourier's law, the present invention overcomes the shortcoming of slow energy transmission in some systems by using the instantaneous behavior of flipping, and will improve its effective thermal properties and realize rapid energy transmission.

Outstanding technical effects of the present invention are:

(1) In order to control and optimize the effective thermal conductivity, the present invention adopts the flipping operation to increase the total heat flow from the high-temperature heat store into the system, thereby achieving faster heat transfer when the sample is in contact with the heat store.

(2) The simple model proposed by the present invention that can be used in the ocean can realize the effect of energy transmission by using the temperature difference between the ocean surface and the bottom, and rationally utilize the potential energy value of the ocean.

Description of drawings

FIG. 1 is a schematic diagram of the structural composition of an embodiment of the present invention. In Fig. 1, the mark T _Rh represents the temperature of the high-temperature thermal store, and the mark T _Rc represents the temperature of the low-temperature thermal store; T _rod (t,x) represents the temperature of the long-rod system changing with time t and long-rod length x.

Fig. 2 is the temperature change of the high-temperature thermal store according to the embodiment of the present invention. In Fig. 2, the symbol T _Rh (t) represents the temperature of the high-temperature thermal store changing with time t.

Fig. 3 is the variation of the temperature of the low-temperature thermal storage according to the embodiment of the present invention. In Figure 3, the notation T _Rc (t) represents the temperature of the low-temperature thermal store as a function of time t.

Fig. 4 is the calculation result of the temperature distribution in the quasi-steady state under the flipping condition of the present invention.

Fig. 5 is the calculation result of the transient temperature distribution under the flipping condition of the present invention.

FIG. 6 is a graph showing the relationship between the ratio of the effective thermal conductivity to the intrinsic thermal conductivity and the turnover frequency obtained in the present invention.

FIG. 7 is a graph showing the relationship between the ratio of the effective heat capacity to the intrinsic heat capacity and the turnover frequency obtained in the present invention.

Fig. 8 is the simulation result of the water flow when a heat source is placed at the lower left end of the liquid-filled container according to the present invention.

Fig. 9 is the flow rate of water at each position of the container when the heat sources are different according to the present invention.

Fig. 10 is an application effect diagram of the present invention.

detailed description

The following embodiments will further limit the present invention in conjunction with the accompanying drawings.

Referring to Figures 1 to 3, the embodiment of the present invention is provided with a high-temperature heat store 1, a low-temperature heat store 2, a long rod system 3 and a fixed shaft 4; the left end of the long rod system 3 is connected with the high-temperature heat store 1 and makes the long rod system 3 heating, the right end of the long rod system 3 is connected with the low temperature heat storage 2 and the long rod system 3 is cooled, the center of the long rod system 3 is fixed on the fixed shaft 4, the long rod system 3 is overturned and the two ends of the long rod system 3 are turned Switch continuously between high temperature thermal storage 1 and low temperature thermal storage 2.

In Fig. 2, mark 5 is the temperature change 1 of the high-temperature heat store, and 6 is the temperature change 2 of the high-temperature heat store; in Fig. 3, mark 7 is the temperature change 1 of the low-temperature heat store, and 8 is the temperature change 2 of the low-temperature heat store.

The instantaneous action of flipping is used to enhance heat transfer, as follows:

1) Contact the left end point of the long rod system 3 with the high temperature heat store 1;

2) Contact the right end point of the long rod system 3 with the low-temperature heat store 2;

3) fixing the central point of the long rod system 3;

4) Flip the long rod system 3 so that the left end of the long rod system 3 with a lower temperature is connected to the high-temperature heat store. Due to the large temperature difference, the left end of the long rod system 3 is heated rapidly; at the same time, the right end of the long rod system 3 with a higher temperature Connected with the low-temperature heat storage, similarly, due to the large temperature difference, the right end of the long rod system 3 cools down rapidly;

5) Flip the long rod system 3 so that the higher right end of the long rod system 3 is connected to the low-temperature heat storage. Due to the large temperature difference, the right end of the long rod system 3 cools down rapidly; meanwhile, the lower left end of the long rod system 3 is connected to the The high-temperature heat storage is connected, and similarly, due to the large temperature difference, the left end of the long rod system 3 is heated rapidly;

6) Steps 4) to 5) are repeated until the long-rod system 3 reaches a quasi-steady state, and relevant calculations are performed to obtain effective values of the thermal properties of the flipped sample.

Figures 4 and 5 respectively show the temperature distribution of the long rod system obtained by the present invention under different sample conditions. Figure 4 is the temperature distribution diagram of a sample when it reaches the quasi-steady state; Figure 5 is the calculation result of the temperature distribution of a sample in the transient state.

Fig. 6 is a graph showing the relationship between the ratio of the effective thermal conductivity to the intrinsic thermal conductivity and the turnover frequency obtained in the present invention under different sample conditions (the intrinsic thermal conductivity of the long rod system is different).

Fig. 7 is a graph showing the relationship between the ratio of the effective heat capacity to the intrinsic heat capacity and the turnover frequency obtained in the present invention under different sample conditions (the heat convection coefficients of the high-temperature heat store and the long-rod system are different).

Figures 8 to 10 show one of the possible working modes of the present invention, that is, placing it in a fluid that is heated at the top and cooled at the bottom to achieve the effect of energy transmission. Since the temperature of the bottom of the water is lower than that of the upper surface, it is difficult to generate convection. Therefore, a heat source is placed at the lower left end of the container to drive the movement of water in the surrounding area, thereby driving the rotation of the long rod to achieve the effect of energy transmission. Two aspects are mainly concerned: (a) the relationship between the heat energy released by a static heat source placed in the lower left corner of the container and the flow rate of the liquid in the container; (b) the heat transfer energy from the tip of the long rod into the water. Fig. 8 is a diagram of the water flow motion vector r measured after placing a heat source R at the lower left end of the container; Fig. 9 is the flow velocity of water in a fixed direction when different heat sources are placed at the bottom; Fig. 10 is a hydraulic device containing 6 axes being controlled The effect diagram of rotating in the hot (23°C) and cold (3°C) fluid. The flow velocity in the center of the vessel is non-zero because the heat source is placed at the corner which hinders the fluid motion. Fluid circulation increases the likelihood that the resulting convection can overcome viscous drag. In addition, this small flow rate can be amplified through the conversion of gears to drive small electric generators. This is equivalent to the effect of flipping the system at a frequency of 0.001 per second. From Figure 6, it can be seen that the effective thermal conductivity can be increased many times the intrinsic thermal conductivity. If the rod is made of a material with the same density as water, the rod can move like water itself, and a small amount of heat at the bottom is enough to drive it to rotate.

Claims (1)

1. A turning device that can be used in the ocean to increase heat conduction is characterized in that it is provided with a high-temperature heat store, a low-temperature heat store, a long rod system and a fixed shaft; a heat source is placed at the lower left end of the turning device to drive the water in the surrounding area sports; One end of the long rod system is connected with a high-temperature heat store to heat the long rod system, and the other end of the long rod system is connected with a low-temperature heat store to cool the long rod system. The center of the long rod system is fixed on a fixed shaft, and the long rod system The system flips over and makes the two ends of the long rod system continuously switch between high-temperature heat storage and low-temperature heat storage; the material of the long rod is selected to have the same density as water, and the long rod moves like water itself, and part of the heat at the bottom drives its turn.