I am a practitioner of solar water heaters. I don't know if the solar hot water bottle you mentioned is the black plastic bag commonly used in Shandong and other areas for rooftop bathing. If so, it's simple: it is a closed black plastic bag to which two pipes are connected, one for the water inlet and the other for the return signal pipe. 'water. When using, first place the plastic bag on the roof with direct sunlight and use the tap water pipe to fill the plastic bag with water through the water pipes upper and lower. When the water is full, water will flow out of the signal pipe. , and the tap water will be turned off. As the black plastic bag absorbs heat easily, it naturally heats the water inside and can therefore be washed in the evening.
This thing is relatively cheap and can usually be bought for a few dozene yuan. However, since it cannot retain heat, it can only be used in summer, and due to the aging of rubber, it is used. Generally can only be used for one year.
Steps to make small solar technology work
No. Solar hot water bottles should be placed on the roof of a rural bungalow and should be placed in a place with the best light in the house, otherwise the heating effect will be affected and they can only be used during dog days. in summer, it is basically ineffective in winter and is only suitable for rural bungalows. The solar hot water bottle is made of polymer nylon plastic, added with anti-aging agents, ultraviolet heat absorbers and other special heat-absorbing materials, and a double-layer composite surface of a collection device heat.
1. Clean the eraser materials with a brush:large eraser, trash brush.
Tools: scissors, glue.
Production method:
1. Dig a small, shallow round hole in one end of the eraser 2. Remove the tip of the trash brush, wash it and dry it.
3. Cut the end of the brush tip to turn it into a small brush
4. Insert the tip of the brush into the small round hole of the eraser and stick it firmly with glue (finished)
2. Small production: solar hot water bottle
Material:
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Large black plastic bag, rope.
Preparation method:
Fill the black plastic bag with water, tie the opening of the bag tightly and expose it to the sun (see photo). After a while, the water in the bag will be warm and can be used to wash your face and feet.
3. Materials: nuts, matches, plasticine, small strips of fabric.
Steps:
1. Put the tip of the nut on the fire andburn it for a while, then throw it into cold water. The nut will crack along the seams.
2. Break the walnut into two halves along the seam.
Antique clock - hourglass
1. Take out the two boxes of jelly that were eaten and poke a hole in the middle of the boxes of jelly.
2. Take out another clear straw and use the straw to connect the two jelly boxes together.
3. Put the sand into the jelly box, then close the opening of the jelly box with plastic wrap. (Complete)
3. Remove the walnut kernels, leaving the shell empty, and stick a small piece of modeling clay inside the shell.
4. Use matches and a small piece of fabric with “Dream” written on it to make a sail and insert it into the playdough. Thus, a “nuclear ship” carrying dreamsThe “fishing boat” can now set sail.