Appliance industry

1. Heat storage heating technology is a kind of clean and economical heating way

The heating demand in winter in northern China has an important influence on urban environment and energy consumption. Because of China's current energy consumption is mainly dominated by coal, serious environmental pollution, the city basically is a typical coal-burning pollution, sulfur dioxide and carbon dioxide in the atmosphere, 90% are from coal. With the increase of coal consumption in the heating period each year, the pollution concentration is sharply over the standard, which is not only serious pollution in the area, but also with the change of the air flow, which affects other non heating areas in the country, even the neighboring countries.

According to the experience of many big cities in the world, the fundamental way to improve the air pollution is to change the energy structure.

Heat storage type electric heating technology is a successful attempt, the heat storage principle of the heat storage of the heat storage medium electric heating, the heat absorption and temperature, the heat storage medium to store heat insulation measures in order to achieve the purpose of reducing; release the heat in the exothermic heat storage medium temperature stage. In China, since 2008, the State Grid and the Beijing municipal government on the part of the building of a large scale "coal to electricity" project, has achieved great success, the use of thermal storage electric heating technology.

Relevant experts for the use of storage electric heater and city central heating pipe network are compared, considering the factors of heat index, heating equipment investment, operating costs, maintenance costs and depreciation, the conclusion is that the cost of storage electric heater heating is much lower than that of ordinary electric heater; such as building energy calculation, the cost of below the city centralized heating network centralized heating fee standards, the use of heat storage type electric heater, per square meter construction area of a heating season can save cost about 26%; if used in non heating energy-saving construction costs will be slightly higher than the city centralized heating network of central heating, but the actual in the non energy saving building 24 hours a day, most people don't open fire, and the city centralized heating network generally costs are fixed, so even in the non energy saving building thermal storage type electric heater is not higher than the cost of Urban centralized heat pipe network cost.

Addition to economic benefits, with an electric heating device for reducing soot and smoothed by "peak" cut peak load, can effectively reduce the peak power demand, which plays an important role in making full use of time low power waste, has significant social benefits.

2. Principle and characteristics of heat storage and heating

Heat storage type electric heater is in nightly low price electricity heating for 6-7 hours, the cheap electric energy converted into heat, and stored in the 17-18 hours; other peak periods, will release the stored heat power, so that it can use the low tariff policy, and 24 hours continuously to the room heat, to achieve the "peak, low heat storage, electricity halved".

Storage electric heater with electric heating tube as a heating element to heat storage brick as heat medium, the heating pipe is heated to heat directly to the heat storage brick, heat storage brick made of high density iron oxide composition, specific heat 1.1KJ/ C.Kg, namely per kilogram of heat storage brick temperature 1 C can absorb 1.1 KJ heat storage. The average maximum temperature of the heat storage brick can reach above 700 DEG C, the heat storage can also be exothermic, and no harmful gas is released. After power failure, through the role of heat preservation brick and the insulation layer between the shell, the heat storage brick according to a certain exothermic curve see Figure 1 (equipment power is 3200W), to achieve 24 hours of continuous heat to the room. Therefore, the heating room temperature fluctuation is very small, basically in a uniform, constant state.

Figure 1 Heat storage type heater economic and environmental protection

Figure 2 Heat release curve

The heat storage heater has the following advantages:

(1) low power consumption, lower operating costs of storage and use of heat and electricity heating trough heat storage period, stable release throughout the day, running costs decreased by about 50%.
(2) continuous heating for 24 hours a day, room temperature uniform and stable, warm and pleasant. Heat is stored in the heat storage capacity of the high heat storage brick, and through the efficient thermal insulation material control system release, the release of all day to ensure indoor heating. After the calculation of the configuration of the heat storage heating system can make room temperature 16-20 C.
(3) flexible adjustment, applicable to the needs of different users
(4) beautiful appearance, easy installation
(5) safe and reliable operation, maintenance free
(6) acts of energy conservation, green heating; no pollution, no noise, safety and environmental protection
(7) long service life, usually 15-20 years.
3  storage thermoelectric heater structure characteristics
The structure of the heat storage type heater is not complicated, which is mainly composed of the heating element heating element (heating pipe), the heat storage brick, the thermal insulation material and the temperature controller.

Fig. 3 internal structure of heat storage type electric heater

The world's leading brands of regenerative electric heater has the elegant appearance, light weight, high heat storage body, good insulation properties, thermal control technology superior etc..

Most of the thermal storage heating manufacturers focus on the research and development of heat storage media, which are considered to be the high thermal storage performance of the medium, so it can solve the problem that the regenerative heat exchanger can not be released for a long time. In fact, in addition to the quality of heat storage media, the electric heater itself is the key to the control of heat release. It is necessary to have a good heat storage medium, but also to make the stored heat can be better preserved, when necessary to get controlled release. So the choice of insulation material is very important.

At present, some domestic brands have two problems, the first is relatively large volume, heavy weight, the space occupied by the international advanced level models of two times. Second is the temperature control state is not ideal, heat storage electric heater overheating in the morning and 3-4 PM to cool. This is not only the ideal heat preservation material, but also one of the reasons.

4. Nano porous insulation board is an ideal thermal insulation material

Nano porous insulation board is the use of nano silicon dioxide, adding appropriate additives, through the special process of direct compression molding of high pressure insulation material.

Due to the synergistic comprehensive effect of its special nano porous structure and various additives, used in the different temperature range to maximize the inhibition of heat conduction and convection and radiation, makes the material is much better than that of all other traditional insulation materials, such as mineral wool, pearl rock, insulating brick, calcium silicate, vermiculite and ceramic fiber products that is better than the aerogel mat and other products, in most of the temperature range of thermal conductivity of nano microporous insulation panel is even lower than the static thermal conductivity of air.

The MT-800 microporous insulation board produced by our company is a kind of ideal thermal insulation material which is very suitable for the application of thermal storage heater. The characteristics of the product are as follows:

The application of MT-800 in heat storage type heater, has the following advantages:

1 because of its room temperature to 800 degrees in different temperature range of thermal conductivity is very low, can be said to be the best insulation material. So the heat in the heat storage brick in the reservoir to the highest level of protection, to prevent the uncontrolled loss.
2 at the same time, because of its low thermal conductivity, thermal insulation effect under the same circumstances, insulation materials can be very thin, is the traditional insulation materials such as mineral wool, ceramic fiber and calcium silicate 1/3-1/4. This provides a favorable condition for the storage of thermal and electrical heating of light and small space.
3 at the same time, MT-800 is environmentally friendly non combustible material, will not be used in the process of releasing any harmful substances, in the absence of external damage can be permanently used.
So, in order to create an ideal heat storage type heater, do not ignore the choice of insulation material. MT-800 nanoporous insulation board is the most ideal material.
Because of the different thermal storage characteristics and usage of each heat storage brick, the optimum thickness of MT-800 should be optimized. Please contact our sales engineer to calculate.

The information in this paper is based on our best understanding of the product. We do not undertake any guarantee for the accuracy and completeness of the information, and shall not be liable for any potential loss of any property rights. We reserve the right to make changes to the specifications of the product at any time without notice. Any user of our products will have to bear all the risks of their property, health and other aspects of use.