1. The principle is different:
Photovoltaic - high-purity silicon can use solar light to generate direct current, photovoltaic power generation;
Photothermal--collecting the solar thermal processing into the vapor state, promoting the turbine, the generator generating alternating current, photothermal power generation; the principle is the same as traditional power generation;
2. Different ways of energy storage:
Photovoltaic-batteries have a service life of several years and need to be replaced. Replaced batteries will cause a lot of pollution.
Photothermal-thermal storage tank; use hot-melt salt, no need to replace, just add;
3. Use different directions:
Photovoltaic - suitable for decentralized, small-scale, upscale cities; small local area power supply
Light and heat - suitable for centralized, large-scale, general areas; the entire region, province, and even the country's large-scale power supply, using only 100 square kilometers of solar thermal energy in Xinjiang desert, enough for our electricity in China; Xinjiang desert is 42.48 10,000 square kilometers;
4. The relevant industrial chain is different:
Photovoltaic--Si ore production, purification, slicing, product, and related industry chain are professional;
Light and heat - steel, glass, cement, etc., involving many industries, similar to real estate, related industry chain length, very rich;
5. Different ownership of core technology and equipment:
Photovoltaic - core technologies and equipment are controlled by Germany, Russia, Japan, and the United States; we need to spend a lot of foreign exchange to buy;
Photothermal--the core technology and equipment are all domesticated; all intellectual property rights are completely state-owned;
Venous cannula is also a deep venous puncture catheter. The method is to select the appropriate puncture site and insert the needle under the skin, and insert the needle with negative pressure until the dark red blood is absorbed, indicating that the needle has entered the vein, and the guide wire is inserted. Withdraw the puncture needle to leave the guide wire in the blood vessel, and then insert the venous catheter that needs to be indwelled along the guide wire, then exit the guide wire, inject diluted heparin saline and fix the catheter, the deep venous catheterization is completed. The veins for puncture and catheterization are usually selected clinically, including the subclavian vein, internal jugular vein, and femoral vein. After the puncture catheter is indwelled, attention must be paid to the care of the puncture site to avoid infection with thrombus or catheter falling off.
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