In the decades when the fireplace was born and entered the commodity era, various types of structural performance of the fireplace have emerged in the HVAC products market in China, including China. The types of these fireplaces are as follows: 1. According to the heating method, it can be divided into instant wall hanging furnace and volume wall hanging furnace; 2. According to the purpose, it can be divided into single function and heating bath dual-use type, of which heating and bathing dual-use type can be divided into casing type wall-hung boiler and plate-changing wall-hung boiler; 3. From the characteristics of the gas valve body, it can be divided into an open-type wall-hung boiler and a proportional wall-hung boiler; 4. From the characteristics of the combustion chamber pressure, it can be divided into positive pressure combustion type wall-hung boiler and negative pressure combustion type wall-hung boiler; 5. From the form of heat exchanger, it can be divided into internal combustion type wall-hung boiler and external combustion type wall-hung boiler; 6. From the characteristics of the circulation system, it can be divided into open wall hanging furnace and closed wall hanging furnace; 7. From the characteristics of whether or not the residual heat can be recovered, it can be divided into ordinary wall-hung boilers and condensing wall-hung boilers.
PPF (luminous flux density) is an indicator used to measure the light energy output of plant lamps, indicating the flow of light energy through a unit area in a unit time. The higher the PPF, the following effects on plant lights:
1. Provide more adequate light energy: high PPF means that plant lamps can output more light energy, which is very important for plant photosynthesis. Photosynthesis is a key process for plant nutrient synthesis and growth, and high PPF can provide more adequate light energy and promote the efficiency of plant photosynthesis, thus promoting plant growth and development.
2. Promote the photosynthesis efficiency of plants: plant lamps with high PPF can provide more intense light, so that the chlorophyll on the leaves of the plants can absorb light energy more fully, thus improving the efficiency of photosynthesis. The improvement of photosynthesis efficiency can increase the nutrient synthesis capacity of plants and promote the growth and development of plants.
3. Increase the yield and quality of plants: high-PPF plant lamps can provide more intense light and promote the growth rate and yield of plants. In agricultural production, the use of high-PPF plant lamps can increase the yield of crops, and the quality of crops may also be improved due to the increase in light intensity.
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