Structure for enhancing a heat exchange rate of an electric radiator

Abstract

A structure for enhancing a heat exchange rate of an electric radiator is especially used in the electric radiator which applies a mineral oil to transmit the heat, such that a higher heat exchange rate can be achieved at a circulation part of related oil leaf.A relative distance between inner pipe walls of the oil loop is shortened, and a ratio of a long side to a short side of the loop is set to be greater than 6:1, which enables a flowing heat-transmission oil to easily break through a threshold Reynolds number to form a turbulent flow. On the other hand, heat-carrying particles of small specific heat are mixed into the oil body to improve the effect of heat transmission.

Description

BACKGROUND OF THE INVENTION[0001](a) Field of the Invention[0002]The present invention relates to a structure for enhancing a heat exchange rate of an electric radiator, and more particularly to a structure which is used in an oil-leaf electric radiator to improve the heat exchange rate of oil leaves.[0003](b) Description of the Prior Art[0004]As an oil-leaf electric radiator does not consume oxygen and is not provided with a high temperature of burning, it has been widely used. To resist an internal pressure, an oil-leaf loop of the conventional oil-leaf electric radiator is in a circular cross section to effectively disperse stress; therefore, it is not able to allow a heat transmission oil to quickly deliver heat energy, causing a temperature inductor to be unable to control an operation of a heater and allowing the heater to operate at an excessively high temperature. Accordingly, the internal pressure of machine will be increased, such that a casing will be burst out to form an...

AI Technical Summary

Benefits of technology

"The present invention aims to enhance the heat exchange rate of an electric radiator by using a specific heat transmission oil with high efficiency of heat dissipation. This results in a faster heat exchange and better oil leaf for turbulent flow. Additionally, the heat transmission oil is combined with heat-carrying particles to further improve heat dissipation. The use of a heat transmission oil with a lower heat specific than mineral oil allows for faster temperature exchange and resistance to eco-issues."

Problems solved by technology

To resist an internal pressure, an oil-leaf loop of the conventional oil-leaf electric radiator is in a circular cross section to effectively disperse stress; therefore, it is not able to allow a heat transmission oil to quickly deliver heat energy, causing a temperature inductor to be unable to control an operation of a heater and allowing the heater to operate at an excessively high temperature.

For the aforementioned oil loop of circular cross section, if it is desired to easily achieve a turbulent effect, a diameter of the loop should be decreased; therefore, under an equal pressure, a flow rate of the loop will be inevitably increased, which will decrease a time to exchange heat with an inner wall of pipe, thereby resulting in a reduced efficiency of heat exchange.

However, after a long time of usage, the oil quality will be degraded to lose an effect of heat transmission, and viscosity and degree of lubrication of the oil will be greatly reduced.

If each machine requires 1˜3 liters or more of the heat transmission oil, then a severe pollution will be resulted after recycling the oil.

Furthermore, the recycled oil cannot be converted for other regeneration purposes.

Therefore, an obvious disadvantage exists in an issue of environmental protection.

Correspondingly, as the on-and-off operation in a higher frequency should be performed by the switch intermittently, it is easy to damage the switch or even the heater.

The most important is that when the aforementioned heater is subjected to the periodic on-and-off operation in a normal condition, its parts are easily degraded and damaged, and as the complete heat exchange cannot be performed to a part of the heat transmission oil, when a part of the oil liquid returns to the heater, it will absorb the heat energy again to accumulate a large heat, which allows the oil quality to be overheated to cause the degradation; following that, a heat dissipation performance is reduced.

In general, after three years of usage, the heat dissipation performance of heater will be clearly disabled and therefore it should be replaced, whereas the waste oil cannot be reused, thereby constituting a large burden to an ecosystem.

The aforementioned shortcomings are caused by that the circulation process is not able to effectively proceed with the heat exchange, and the heat dissipation rate is slow.

However, the heater 12 is out of control due to that the aforementioned inductive switch 110 is not able to quickly receive an instruction, which causes the heater 12 to operate continuously, such that the heater 12 will definitely be subjected to the high temperature.

When the heat transmission oil is operating under the excessively high temperature, a large scale of swelling will occur, which increases a distance between the oil molecules and reduces a total capacity of heat dissipating.

However, for a design basis of length to width ratio, only a uniform distribution of oil loop is taken into consideration without accounting for that the viscosity of existing mineral oil can facilitate a condition of turbulent flow, which will reduce the heat exchange rate.

However, the driving energy is very small, and the flow rate of oil will be very slow correspondingly, which is difficult to form the turbulent flow at the pipe wall.

A method is to reduce a cross sectional area at a pipe opening; however, after decreasing the cross sectional area, the flow rate in the pipe will be increased at an equal pressure, such that a time to exchange heat will be lost, thereby greatly reducing the efficiency of heat exchange.

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