discount 70% in 2018-10-19 to 2018-10-21
price: USD$ 23.80
freight :USD$7.00,(Postal parcel)
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Installation and use
The installation and use of the refrigeration plate is very simple. Before installation, it is best to prepare a little thermal grease, then find a battery connected to the refrigerator, two leads, you can feel at one end and the other end was cold fever, the polarity of the lead and remember the cold and hot sides determine good refrigerator. If you want to get a larger amount of refrigeration, it is suggested to use two cooling methods, namely by two fold, with a cold heat below one, the results show that the two stage refrigeration effect is much better than the single level, if the conditions can be selected in grade three, certainly must have the power power support.
Note: this item is due to test DIY processing heat capacity (can refer to online data for other heat treatment). Only to be used, or the object of interest. I don't know. Please don't beat it. Once the refrigerator is used, the package will not be returned! No use of this shop does not bear all the freight, please need to play buyers, DIY friends carefully buy this product! Thank you
Semiconductor cooler brings us new concept of heat dissipation:
The semiconductor refrigerator in the case of electricity, both ends of the plate will have a certain difference, people use it to provide heat energy for the condensing surface objects provide a low temperature environment, fever. But the effect is very obvious. It's very convenient to use.
Here is about the semiconductor refrigerator according to the characteristics of thermoelectric technology, using a special semiconductor thermopile refrigeration, capable of converting electrical energy into heat energy, high efficiency.
There are many uses of semiconductor coolers, which can be used in portable refrigerators / incubators, hot and cold water dispensers, etc.. It is also used for heat dissipation of electronic devices. At present, the main semiconductor material used in cooler is bismuth telluride, and the impurity is treated as N type or P type semiconductor thermoelectric element by special treatment. It is characterized by a cooling and heating.
The DC power supply is switched on, the electronic negative (-) of the first through the P type semiconductor, which absorbs heat to N type semiconductor, and the heat release, every NP module, there is heat from the side is sent to the other side, caused by temperature difference, thus forming a cold end.
The following is a description of semiconductor devices, for your understanding of the semiconductor is very helpful
Thermoelectric refrigeration is a thermoelectric effect, mainly the application of Perle effect in refrigeration technology. A practical thermoelectric refrigeration device is composed of a semiconductor thermocouple which has a remarkable thermoelectric effect and a relatively high thermoelectric refrigeration efficiency.
The semiconductor thermocouple consists of N semiconductor and P type semiconductor. The N type material has excess electrons and has negative temperature difference potential. P type electronic materials are insufficient, the potential temperature; when the electrons passing through the node to N from P, its energy will increase, and increase the energy equivalent to the energy consumption of nodes. This can be demonstrated by a reduction in temperature difference.
In this way, the semiconductor components can meet the requirements of users by various connection methods. A P type semiconductor and N type semiconductor connected thermocouple connected to DC power supply, temperature difference and heat transfer in the joints will be. In the above joint, the current direction is N to P, the temperature decreased and endothermic, this is the cold end. At the junction below, the current direction is P to N, the temperature rises and the heat is released, so it is the hot end.
According to the figure to the number of thermocouples connected in series on the semiconductor circuit, and heat transfer is parallel, which constitute a common heap of thermoelectric refrigeration. After the DC power supply is shown on the diagram, the top of the thermopile is a cold end, and the bottom is the hot end. With the help of the heat exchanger and other heat transfer means, the hot end of the thermopile heat and continue to maintain a certain temperature, the cold end of the thermopile in the work environment to endothermic cooling, this is the principle of thermoelectric refrigeration.
Matters needing attention in use
1, do not know when the hot and cold surface cooler when using this method, the red line is connected to the power line is connected to the anode, cathode, and without cooling conditions, the instantaneous power of the test, which touch the two end of the refrigerator, you will feel a fever, a little have a fever cold, heat, cold side cold. But the time can not exceed 5 seconds, otherwise, because the hot end temperature is too high, it is easy to cause device burn out.
2, in general conditions, lead wire is usually expressed as positive electrode with red, which is usually expressed in black as negative electrode, which is the wiring method when the thermoelectric cooler works. When the heat is needed, the polarity of the current can be changed. The switching power supply must be used in the refrigeration operation, and the ripple factor of the power supply should be less than 10%.
3, the thermocouple thermocouple and logarithmic limit voltage identification method, thermocouple logarithm refers to the number of P, N nodes. For example: cooler model for TEC1-12706, 127 for cooler thermocouple logarithm, 06 allowable current value: A, the threshold voltage is logarithmic thermocouple cooler * 0.12, for example: limit voltage V TECI-12706 = 127 x 0.12 = 15.4 (V). The normal working pressure is 78% of the limit voltage, such as the working voltage of TEC1-12706 is 15.4*0.78=12.01V.
4, all kinds of cooler in use or in the test, the cooling and heating temperature of hot and cold exchange should be returned to the room temperature (usually more than 15 minutes). Otherwise it may cause damage to the refrigerator.
5, in order to prolong the life of the thermoelectric cooler, sealing the deal with refrigeration components around. We have two kinds of methods, one is the use of 704 silicone seal; the other is a mining epoxy resin seal, seal is designed to make the refrigerator completely isolated thermocouple with the outside air. Play a moisture-proof effect, and can prolong the service life of the refrigerator.
6, at the time of installation, the first two will wipe the refrigeration assembly clean, and in cooler for hot and cold surface evenly coated with a thin layer of thermal grease. The surface contact with the cooler is aluminum radiator or cold storage plate should be smooth, and wipe clean, also on the surface evenly coated with thermal grease; cooler during installation must be good contact with the cold storage cold plate, hot surface should also fully contact surface and the aluminum radiator, (as with screw fastening screws, several force should be uniform, not excessive or uneven force). In order to achieve the cooling effect, application of thermal insulation material is filled between the cold storage board and aluminum radiator, the thickness of 25-30mm is appropriate.
Install the pressure of 7, cooling plate suggested between 150PSI to 300PSI, the pressure is too low will cause cooling plate contact surface is bad, too much pressure, will damage the cooling plate.
8, users in the absence of special instruments, determine the cooler is qualified or not, mainly to test the resistance. You can use data or bridge with compensation resistance, resistance measurement of the refrigerator. Using a multimeter to test the static resistance refrigeration component is not accurate, only for reference.
9, in the process of handling and installation of the refrigerator, the operator should be gently, no refrigeration piece fall from a height, even at the height of the 10-20cm will cause the internal resistance of cooler produced significant changes, resulting in damage to the refrigerator.
10, a semiconductor refrigerating sheet used in the following situations, the life may be cut: A, the frequent use of alternating hot and cold B, vibration condition using C, a hot end radiator temperature exceeds 65 degrees D, working voltage (recommended the use of overpressure does not exceed the limit voltage 70%) cooling plate heating surface E, cooling plate contact F, not around the sealing glue used in humid environment
11, a semiconductor refrigerating sheet used in the following occasions, there will be rapid damage may: heating surface A, cooling pad does not contact any cooling objects B, cooling plate voltage exceeds the limit voltage pressure C, cooling plate more than 500PSI