During the summer season, when a building＊s heating system is not used to full capacity, excess capacity from the existing heat source can be used for heating outdoor pools. A heat exchanger installed between the swimming pool＊s circulation system and the building＊s ordinary heating system separates the circuits and provides pool heating.
Heating systems normally supply heat to a single building, with the heat source inside this building. The heat is normally provided by a boiler, but it can also come from a heat pump or solar panels. Heat exchangers are commonly used in all types of heating applications with demands on comfort, reliability and safety. However, either way, this is an excellent system to invest in for several reasons. The heat exchanger transfers heat from one circuit to another, but also efficiently handles the pressure differences that normally exist between the primary and secondary sides. The heated boiler water can be circulated directly through the heating system to provide space heating (radiators). The normal system＊s operating temperature is below 100∼C (212∼F). Tap water is heated by transferring heat via a heat exchanger to the tap water system where water at a lower temperature is required, normally between 50每60∼C (122每140∼F).
The temperature of the return water can be an important factor in protecting the boiler. By circulating heated water from the boiler to a heat exchanger with a temperature control, the required temperature for floor heating (30∼C/86∼F) can be obtained. The temperature difference can also be accomplished using a three-way valve, mixing heated water with return water in the system. Swimming pools may be heated in the same way. In this application a plate heat exchanger (PHE) with titanium plates will prevent chlorinated water or seawater from contaminating the main system. This will eliminate the risk of corrosion.
Optimized energy utilization
In some buildings, for example hotels, there is an opportunity to string several different heating applications together, utilizing the energy as the temperature drops in each consecutive application (see graph below). This may involve radiators, ventilation, tap water, floor heating and swimming pools. The he at can be generated by a boiler or a heat pump (geothermal heating) and then transferred through a string of heat exchangers to the different applications. The heat to the radiator system is transferred directly from the boiler at 75∼C (167∼F). A PHE transfers heat from the boiler to the heating ventilation system at 70∼C (158∼F). The heat for the tap water is extracted by a third PHE at the required lower temperature, about 65∼C (149∼F). This PHE also transfers heat to the floor heating system at a temperature of 30∼C (86∼F). A fourth heat exchanger uses the remaining heat for the swimming pool.
Solar energy can be used as heat from solar collectors, i.e. solar thermal technologies, both in large-scale and small-scale installations. Providing households with heated water is one common heating application in regions with the appropriate climate. The solar heat is absorbed on a flat surface and then transported to storage by some type of fluid. A storage tank is needed because most.
There are two main reasons for using a heat exchanger to separate the solar heating system.
Treated water, or a glycol solution, is needed in the solar panel. A closed loop also prevents the risk of scaling and corrosion in the solar panel. Heating of the heat is being produced when demand is low. Given the often-unreliable nature of sunshine, a standby solution with a heater of conventional type is required to maintain a constant domestic hot water temperature. This is why solar panels are usually used as an alternative or supplemental energy source, for example to warm swimming pools.
District heating is an environmentally friendly and reliable method of delivering comfort heating. Heat generated in a central boiler plant is transferred to several buildings through pipes. A very wide range of sources, including combustion of oil, natural gas, biofuel or geothermal sources can provide the heat. The possibilities of using waste heat from industry, surplus heat from waste incineration, industrial processes and sewage, purpose-built heating plants or co-generation plants in district heating make it a flexible and energy efficient choice. You can
optimize costs as prices change, and maximize environmental protection. For the consumer, district heating means a trouble free way of getting energy. The central boiler of a district heating system is more convenient and more efficient than small individual house-heating systems. Combustion techniques and exhaust cleaning will decrease the negative impact on the environment. Heat exchangers play a major role in enabling efficient heat transfer between the two systems in order to deliver heated tap water and heating to end users. Baode plate heat exchangers represent the preferred heat exchanger solution in district heating systems throughout the world today. Baode currently offers three different types of heat exchangers in district heating applications. The traditional PHE is used when mechanical cleaning of the unit is required. Brazed heat exchangers are used when a cost-effective and very compact design is preferred. These two types are mainly used in district heating substations as tap water heaters and in space heating loops, whereas all-welded PHEs are used in high temperature and high pressure systems.
In multifamily houses, or other buildings with large district heating substations, there is the demanding requirement of supplying space heating, tap water, ventilation and floor heating, to many users with minimal energy loss. Using Baode＊s heat exchangers with their close temperature approach, i.e. 0,5∼C/<0,9∼F, results in better utilization of the energy. It also results in lower return temperature, which is usually desired. Consequently, by using quality products in the heating system, overall costs can be reduced. Another very important purpose of the heat exchangers in the district heating system is to secure the internal installation by separating the end users from the distribution net. This is necessary, as there are major temperature and pressure differences. If an accident should occur, the risk of severe flooding can also be minimized.
A large substation may be defined as a substation connected in two passes. This connection means maximum utilization of heat and a low return temperature during tap water consumption. It is especially advantageous in combination with a combined heat and power plant where a low return temperature is desirable.
The typical space heat load requirement for a small substation, e.g. a one family house, is 15每30 kW and the tap water requirement is between 0,2 and 0,35 l/s. The heat exchangers are usually connected in parallel. Tap water production can be either instantaneous or semi-instantaneous (see page 8). The heat exchanger＊s reliability is essential, as is simplicity for the user and low maintenance requirements. Other important factors are compactness and finish, since the substation may be installed in a conspicuous place in a house. Floor heating can be installed as an alternative, or complement, to radiator heating. By shunting water from the radiator circuit the right temperature for floor heating, approximately 30∼C/86∼F, can be obtained.
By artificially creating optimum growth conditions in a greenhouse, it is possible to cultivate vegetables, houseplants, flowers and tree seedlings all the year round, even out-of-season and in otherwise harsh
climates. Greenhouses can be heated in different ways, for example using ground heating, ventilation or radiators. There is a great need for efficient and reliable heating products in this application. The operating costs may be as much as 35 percent of the product costs when cultivating vegetables or flowers in greenhouses. Baode＊s PHEs assure energy
optimization and reduce the risk of costly shutdowns.
Hospitals and different industries use a lot of steam in their processes. Surplus steam may be used for space heating and tap water heating locally, or sold for use in district heating systems. Baode has developed a range of steam plate heat exchangers, the TS-M Series, for heating water with industrial steam. They feature efficient heat transfer and long life expectancy due to their pressure, temperature and fatigue resistant designs. Together, the design and performance of the TS-M Series add up to greater lifecycle economy, and significant savings can be made in costs, as well as time and energy
Two-pass and parallel connections
Other district heating applications
Most heating applications place high demands on the installed equipment. The products must be reliable and flexible and provide the required safety, and in some systems, meet very high hygienic standards. Low operating costs is another important factor in most systems. These are the kinds of challenges that Baode rises to on a daily basis around the world. Whatever the application, we have the knowledge to solve your HVAC problems and you can always rely on our equipment
Much heat is typically produced during industrial processes. This may be heat emanating from an actual process, but it might also be waste heat from process cooling. It is both environmentally and economically sound to use this surplus heat instead of letting it go unemployed. Baode＊s PHEs are perfectly suited to utilizing otherwise wasted excess heat in factories. The surplus heat could be used locally for space heating or for heating tap water in the factory or in adjoining offices. It is more usual, however, to sell the waste heat, making use of it in district heating applications
In regions with colder climates there are, naturally, many different and more specific heating needs, both indoors and outdoors. Such needs might include ground heating to keep platforms and ramps at train stations free from frost, in order to avoid personal injuries
Product safety is always an important factor when choosing equipment for heating systems in schools and day care centers, as well as in homes designed for the elderly. As children and old people are vulnerable groups heating system shutdowns can have grave consequences.﹛
Sports centre/sports ground
centers and public baths there is a constant need of large quantities of heated tap water for showering. Baode＊s heat exchangers make this possible. Our PHEs are also designed to minimize the risk of bacteria growth, making them both efficient and hygienic products. One heating application that is becoming more common throughout Europe is the warming of football fields. By putting ducts underneath the grass and the circulating heated water through them, the fields will be so much better during the winter season.
District heating systems distribute heated water or, in some cases, steam from a central boiler in a heat plant to multiple buildings. The heat can be provided by a variety of sources, including oil, natural gas, coal, biofuel or heat from waste incineration. The utilization of heat from low-temperature sources, for example geothermal heat, is possible using heat exchangers and heat pumps. By reusing and recycling waste heat, fossil fuel consumption can be reduced, which leads to lower CO2 emissions. The heated water from the heat plant boiler is sent to a heat exchanger, which separates the production site from the distribution pipes in the district heating network. The heat is then distributed to the different end users, where substations take care of the heat transfer to the respective buildings. These substations normally include one heat exchanger for space heating and another for tap water heating. There are several reasons for installing heat exchangers to separate the heat plant and the district heating network. Baode heat exchangers provide superior energy efficiency and reliability in these applications. Usually there are major pressure and temperature differences, which may cause severe harm to equipment and property. A heat exchanger can also protect sensitive HVAC equipment from dirty, polluted or corrosive heating media. Still another important reason for separating production, distribution and end user is to make the areas of responsibilities clear.
In shopping malls, and a lot of other public premises, the heating system focus is more on the ability to provide space heating than providing large quantities of heated tap water. The advantages of the Baode PHE are clearly apparent in these ventilated systems. By specifying a PHE it is possible to achieve a 0,5∼C/<0,9∼F temperature approach. The PHE can also isolate corrosive media from an expensive HVAC system, which reduces the risk of damage and frequent need of maintenance.
Combined heat and power plant
In a combined heat and power plant (co-generation plant) heat and electricity are produced simultaneously, the heat being a by-product. The heat is usually used in district heating networks, which leads to improved energy efficiency and economy. The utilization of the energy in the fuel will be 85每90 percent. The efficiency is 35每40 percent higher than if the heat and electricity are produced separately. In the co-generation plant, burning fuel heats up water that is converted to steam under high pressure and temperature. This steam drives a turbine, which is connected to the generator that produces the electricity. After the turbine the steam is condensed in a heat exchanger. The heat released in this process is then transferred to the district heating pipes, where it is distributed to the end users.
Geothermal heating utilizes the energy from the interior of the earth. It is environment friendly as it enables a reduction in fossil fuel combustion, and it is, as a rule, an economical choice. Geothermal heating is usually used as a complement to other heating sources. If the geothermal water temperature is high enough, the heated water can be fed directly to a heat exchanger and then used in district heating systems. There are also industrial uses and different agricultural applications, most notably greenhouse heating, where the use of geothermal heat may reduce energy costs considerably. The introduction of heat pumps has facilitated an increasing number of geothermal heating applications around the world. The heat pump makes it possible and economical to use low temperature heat from the ground or groundwater. Baode PHEs with stainless steel or titanium plates are your best choice in applications with corrosive media, like geothermal water.