Subject content
Read the hot waters, answer the question
The hot water heater is the new home-based equipment that has emerged over the years because it is not preheating, it is convenient, it is aesthetic, and it is popular with a number of users。
In the case of hot water heaters, when they open their taps for a few seconds, they can provide a hot water supply that is suitable for temperature, even at the rate of one second of heating, three seconds of hot water, quickly and conveniently, to meet the fast-paced needs of modern human life, ideal for users who need hot water at short or long intervals, such as barbershops, hospitals, schools, etc., and, above all, save valuable time. Owing to lack of intimacy, the size is small and does not occupy space. They are generally larger, i. E. Hot kitchen tap power is typically 3kw ~ 5kw, bathing is typically around 6kw ~ 12kw, which requires a dedicated line to be used, and circuit lines are typically over 4mm2。
That is to say, the main advantages of thermostats are two. One is hot water fast without waiting. The second is energy conservation and environmental protection. Since no preheating is required, the heat energy is dispersed without preheating, it is closed when it is used, as much water as it is used, and there is no energy consumption of the unused, unheated, unheated water in the storage of water heaters, which actually saves energy and electricity. In general, thermoelectric water heaters save 15-30 per cent of electricity compared to traditional water heaters. Therefore, countries classify such products as energy-efficient. In the case of water and electricity shortages, it is certainly very realistic to focus on this product。
The greatest concern for electrical water heater products is security. Thermal electro-thermal water heaters are also generally designed to provide adequate consumer safety of their applications, such as the use of non-metal heaters, hydro-segregation technologies, leak protections, and in situ protection。
When you read the general requirements for the installation of water heaters, you can appreciate the safety of the factory。
1. An electrical water heater shall be equipped with a fixed special-purpose plugin and shall not use mobile power panels. The size should match the electrical water heater power plug. The plug should be placed above the water vent level of the electric water heater and, in order to avoid short-circuit hazards caused by water spilling, it would be preferable to use a water-protected plug。
2. Households shall have reliable access to the land and the electrical resistance value shall not exceed four times. Household outlets, which must be connected to the power line, are not allowed to be empty at the end. If conditions do not permit access to the surface line, use the product with a firewall。
In the use of electro-thermal water heaters, the power supply may not be cut through the switch on the plug, as the leak protection plug following the breakout of the plug is not operational and cannot be protected in the event of a malfunction, such as a wire charge。
The above installation processes are verified by professionals and do not meet requirements and are not installed。
Some producers also have water-controlled electric doors, sound alarms, patented circuits, magnetic tarcrete, ultra-temperature blackouts, high-pressure discharges, many of which are multiplely protected and highly safe with state 3c certification。
Another advantage compared to the traditional water heater, the heater, is long life. The cold water is heated directly through the heating body, which is “live water” and is not easy to stay, so the heater also has a longer life span than the traditional electric water heater, usually two to three times as much as the traditional electric water heater, with a quality product of more than 15 years。
Why are most water heaters seen in the mall or traditional water heaters? This has to do with the specifications of the circuits used in our country. In general, the selection is based on the amount of the charge, with a general lighting power line of 2. 5 mm2 applied to the national copper core 1-1. 5 mm2. The 4mm2 power lines were rarely used in urban renovations 10 years ago. The first is a line of 4mm2 which is much more expensive than 2. 5 mm2 and the second is a line of 4 mm2 required for appliances that a family does not have that power. When the hot water heater comes to life, many people's home wires are unable to carry this power and are used reluctantly, with a high risk of electrical fire. The lack of infrastructure is the main reason for the inadequate availability of heaters. New buildings 10 years later, with a standard home main power supply line of 6 mm2 copper core bv, can be equipped with hot water heaters。
The ratio of cold and hot water used in developed countries is 1:9 and, in the past, in china, is 9:1, and we are confident that in the near future we will make it even more reasonable。
In the light of the above, please answer the following questions:
(1) thermal water heater is significantly larger than the traditional water heater (selecting “electricity” or “electricity”) and the heating is therefore fast。
(2) that is, the fundamental reason why the water heater must install the surface is the ground-line electrical resistance (selecting to fill “a much larger” than “a much smaller” or “approx. Equal”) to human electrical resistance, which, in the event of a leak, allows the vast majority of currents to flow along the surface。
(3) if a 1. 5 mm2 route connection is used, i. E. A hot water heater, the possible consequence is 。
(4) the myung family installed a 3kw kitchen heater, as shown in the figure. Mother washes once in the winter, running at about 20s, with one degree of electricity of five cents, so that mom can wash with warm water times。
It's much less power than heat burning on the fuse
[ exhales ]
(1) i. E. Heat water heater power is generally high, kitchen tap power is typically 3kw ~ 5kw and bathing is typically around 6kw ~ 12kw, which is analysed accordingly
(2) it is understood that the ground-to-ground electrical resistance shall not exceed four times. (b) home-based outlets, which must be connected to the power lines, whereas human resistance is usually thousands of euros, so when water heaters fail, even when people come into contact with water heaters, currents are imported from the ground
(3) when the conductor is too thin, the resistance is greater, and the law of joules
Analysis
(4) based on
, calculates the frequency of one degree of electrical washing。
(1) it is understood that thermal water heater is significantly more powerful, more powerful and faster than the traditional water heater, so that heating is fast。
(2) the underlying reason why a hot water heater must install a surface line is that the terrestrial electrical resistance is much smaller than that of humans and that, in the event of a failure, most currents can flow along the surface line。
(3) when using a 1. 5 mm2 conductor connection, i. E. A hot water heater, which is thinner, more resistant and has a high current, based on
It is known that the conductor produces a large amount of heat, so that the consequences may be overheating, increasing temperatures and even burning fires。
(4) mother washes once in the winter, running about 20s, consuming electricity:
The number of times a mother can wash with hot water at 1 degree:
Twice。
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