Technology of the hottest hot water heating dual-p

Hot water heating dual-use stove technology

I. Introduction

since the end of the last century, foreign countries have introduced the wall mounted gas-fired fast hot water heating dual-use stove into the Chinese market, many urban real estate developers have adopted this type of stove for single household gas heating. Among the imported furnace types, European products are in the majority. China has joined the WTO, and the standards of gas appliances are approaching the standards of the European community recognized by international standards. At the same time, the industry standard and national standard of this dual-purpose furnace are currently being formulated. (for example, the clamp clamping surface of samples such as plastic film and fiber wire is also to ensure product quality, standardize installation requirements and ensure safe production while promoting this dual-use furnace.

there have been many discussions on the application of dual-use furnace in China, and the opinions are not completely unified. In fact, each product has its own characteristics, that is, it has its advantages and disadvantages. The key is to see the object of users using dual-use furnace And conditions. At the same time, we should also consider that the South and north of China are not only very different in climate, but also in living habits. When comparing technical and economic schemes, we should also compare them under the same technical and economic conditions, because in the past, there were some problems in the design and management of regional central heating and building central heating. Without taking these factors into account, it is easy to deny district heating and building central heating. This paper discusses the characteristics and related technical and economic problems of the wall mounted gas-fired fast hot water heating dual-purpose furnace, which is for reference only

II. Characteristics of wall mounted gas-fired fast hot water heating dual-use stove

(I) characteristics of wall mounted gas-fired fast hot water heating dual-use stove (see 2)

1. It is basically a gas-fired fast water heater with heating function at the same time. When working, the heating and hot water systems are separated from each other, and hot water should be used preferentially. The heat load (heat flow) of the furnace is also determined by the requirements of hot water supply

2. Equipped with water pump and pressure balance tank required by heating system. Generally, forced air supply and exhaust are used for smoke exhaust

3. It is necessary to have a control device to control the temperature of hot water and ensure the priority of hot water. The two systems of hot water and heating must be isolated to prevent heating water from flowing into the hot water system

4. For the convenience of use, there is a set of hydraulic ignition, monitoring ignition, flameout protection and other safety control systems

5. A safe smoke exhaust pipe should be equipped

(II) advantages and disadvantages of wall mounted gas-fired fast hot water heating dual-use stove (referred to as dual-use stove)

1, advantages

(1) small size, can be hung on the wall, does not occupy the user's use area

(2) beautiful appearance and convenient use

(3) with two functions of hot water and heating, one machine can be used for multiple purposes, which improves the utilization rate of the equipment

(4) organic exhaust, low smoke exhaust temperature, high thermal efficiency and gas saving

(5) compared with natural smoke exhaust system, smoke exhaust is relatively convenient

2. Deficiencies

(1) because it is a fast water heater, the control system is relatively complex. The time from starting to getting hot water is relatively long, which is not conducive to the requirements of using hot water for a short time (washing hands, flushing, etc.)

(2) the heat flow (heat load) of the dual-purpose furnace is determined according to the user's hot water requirements. In general, the heating load of families is lower than that of hot water, especially in areas where the outdoor temperature is not very low. If it is mainly for heating, the heat load of the dual-purpose furnace is likely to be on the high side when the total annual demand for adhesives and sealants in China's automotive industry reaches 100000 tons (see 3)

(3) there are water pumps and fans in the furnace. If 220V AC is used, the dual-purpose furnace itself is already an electrical product. Therefore, the electrical control part is very strict, which increases the cost. Users should pay attention to electric shock caused by poor grounding when using

III. wall mounted gas-fired fast hot water heating dual-use stove is used for different objects

wall mounted gas-fired fast hot water heating dual-use stove is used for different objects, and its effect is also different. This is due to its own characteristics and the specific conditions of the object

(I) technical and economic analysis of wall mounted gas-fired fast hot water heating dual-purpose stove for single household heating in a single door and single courtyard

1, advantages

(1) it solves the heating problem in places where central heating cannot reach (including cogeneration of cooling, heat and power, etc.). This type of furnace should be used when users do not want the dual-purpose furnace to occupy too much land

(2) it has the advantages of flexibility. Each household can decide the form of heating system, heating time and indoor temperature according to their own wishes, which is not limited by central heating

(3) one investment and annual management investment of central heating boiler room and its pipelines are omitted. It is explained here that most of the investment saved is actually passed on to users

(4) heating and gas fees can be charged together

2. Deficiencies

(1) single household heating users are less worried than central heating users. As the users of central heating belong to the "open mouth for food and stretch out for clothes", there are no enjoyable users of gas-fired water heaters who need to be concerned at home. However, if there is no central heating, only single household heating can be used

(2) attention should be paid. This is rarely applicable to the backflow room of smoke exhaust (including the smoke exhaust of neighbors) of formed products. It has been reported that the accident of flue gas flowing into the room has also occurred with outdoor water heaters

(3) since there are water pumps, fans and other equipment in the water heater, the water heater is already an electrical equipment. The civil voltage in China is 220 volts. Therefore, users should consider measures to avoid electric shock caused by poor grounding

(II) technical and economic analysis of wall mounted gas-fired rapid hot water heating dual-purpose stove used in high-rise apartment buildings (household heating)

1, advantages

(1) first, household heating should be compared with a cup team (cup team) that will freeze the centralized gas-fired hot water heating system in the micheldorf operation building in Austria. When there is no central heating, a gas-fired water heater (boiler) with appropriate load (heat flow) and the same technical level as the current dual-purpose boiler can be set in a building (or a building door) to centrally supply users with hot water and heating. Make a comprehensive technical and economic comparison with the household heating scheme in which each household uses a dual-purpose stove. If the conversion investment of household heating is small, household heating can be used. Most of the previous economic comparisons are only compared with the existing central heating, which may not be comprehensive

(2) the advantages of flexible single household heating should also be discounted when used in high-rise apartment buildings. Because it is very flexible for young families without children. Users living in the middle of the building, in North China, can still maintain an indoor temperature of 16 ℃ without turning on the heating system. For this reason, the heating heat consumption of such users is very low (the gas fee paid is very small). On the contrary, if there are users with old people and children, they need to turn on the heating system every day. Their heating heat consumption is far greater than that of the former users. According to the situation in Tianjin, the users with the highest consumption (square meters) reach RMB every quarter. Our people are thrifty, so the elderly fall asleep early

(3) because the central heating system of the building has no (or few) centralized underground heating pipelines. Therefore, the amount of heat loss saved is reduced accordingly

(4) because the boiler room with centralized heating in the building is small and simple, and can even be installed on the roof of a small high-rise building, the one-time and annual investment of the saved boiler room is not much

(5) about heat metering in centralized heating system. There is a requirement to charge an average heating fee in the scheme of centralized heating by measuring the heat of each household, which aims to prevent users from turning off their own heating system and relying on the heat transfer of neighbors to maintain room temperature. However, it is difficult to achieve this goal with the scheme of dual-purpose furnace. Therefore, there is no technical contrast

in fact, the current social problem that it is difficult to collect heating fees is a temporary social problem. It is not the future development trend. Too many false tests will inevitably affect the adoption of new technologies

2. Deficiencies

(1) - (3) the same as in (I) above

(4) because in high-rise apartment buildings, each household has a dual-use stove. Smoke exhaust is troublesome. The normal practice is to build public flue in high-rise buildings (see 1). This will inevitably reduce the actual housing area of high-rise building users. Increase the cost of commercial housing

(5) at present, high-rise apartment buildings in China generally do not have public structural smoke exhaust passages. The smoke exhaust floor of the dual-purpose boiler goes out from the window (see Figure 1). This should not be normal practice. This not only affects the appearance, but also destroys the function of the window, and may make the smoke flow back to the room, or even to the neighbor's room. According to the current installation specifications of gas appliances, it is not allowed

(6) with the improvement of people's living standards and the development of technology, look back on the past and look forward to what gas-fired heating should be like in the future. Most of the multi-storey buildings in the early 1950s set up a coal-fired boiler room under the building, which uses centralized heating in the building, or set up a separate boiler room to use district heating. By the end of the 1950s, due to various economic reasons at that time, people would rather use coal stoves for heating in different rooms, dismantle central heating equipment, and do not use central heating. It was not until the early 1990s that users began to accept centralized heating. This clearly shows that after the improvement of people's living standards, no one wants apartment buildings without centralized heating. However, with the rapid development of China's economy, people's living standards will be greatly improved. In the new year, people who have a better life will be interested in the construction of central heating and heating water (double water) which is both absolutely safe and very convenient. At that time, how to transform the high-rise building with each household having a gas-fired stove

IV. discussion of several problems

(I) about energy conservation:

many articles have discussed this problem in recent years (see 1), and the results are the same. Wall mounted gas-fired fast hot water heating dual-purpose stove is the most economical scheme for high-rise apartment buildings. However, it should be noted here that compared with the centralized heating scheme, there are two different technical conditions

1. Because each household usually uses intermittent heating after using its own dual-purpose stove. The dual-purpose stove will be turned off when there is no one at home. Indoor temperature conditions are different from continuous heating. Moreover, some young people don't turn on dual-purpose stoves and rely on the heat from their neighbors to maintain relatively low warmth

2. Most of the gas-fired central heating or central building heating we use now are pipe systems in the past, and boilers in the past used natural gas (or furnaces and burners are combined). Compared with modern dual-use furnaces, this device is inferior to dual-use furnaces in terms of thermal efficiency and harmful substances in flue gas. Therefore, the heat source scheme of the past centralized heating is compared with the scheme of the modern wall mounted gas-fired rapid hot water heating dual-purpose furnace. There is no contrast in technology. Moreover, in the past, there was a general problem of hydraulic imbalance in the heating system, and there were often phenomena of running, emitting, dripping and leaking on the pipeline. Therefore, there is no contrast between the system and the pipe

(II) more importantly, the safety of smoke exhaust

the smoke exhaust outlet of water heater or dual-purpose boiler with forced air supply and exhaust must comply with the requirements of cjj1299 "installation and acceptance procedures for domestic gas combustion appliances" that has been issued. At the same time, there are more specific in its implementation manual