With economic development and improvement of people's living standards, heating and air conditioning in public buildings and houses have become common needs. In developed countries, heating and air conditioning energy consumption can account for 25-30% of the total social energy consumption. The energy mix in our country depends mainly on fossil fuels, especially coal. A large number of pollutants generated by the combustion of fossil fuels, including a large number of harmful gases such as SO2, NOX and greenhouse gases such as CO2. The environmental problems arising from burning large quantities of fossil fuels have increasingly become the focus of attention of all governments and the public. China's heating has experienced a change from a small coal-fired boiler to a coal-fired boiler. Now further prohibit the construction of small and medium-sized coal-fired boiler rooms in urban areas, reflecting the government attaches great importance to the protection of the atmospheric environment. Therefore, in addition to the type of district heating, there is an urgent need to develop alternative alternative heating methods. Heat pump is a new technology for heating and air-conditioning that can effectively save energy, reduce air pollution and CO2 emissions. Heat pump (refrigerator) is through the work of the heat from the low temperature medium to a medium of high temperature medium. Building air-conditioning system should generally meet the winter heating and summer cooling two opposite requirements. Traditional air-conditioning systems usually require separate sets of cold sources (chillers) and heat sources (boilers). Because of the need to have a cold source (chiller) in a building air conditioning system, boiler and boiler rooms can be eliminated if it is run in heat pump mode in winter, saving not only initial investment, but also the use of clean energy such as electricity throughout the year, Greatly reduce the air pollution caused by heating problems. Using heat pumps to heat buildings can greatly reduce primary energy consumption. Normally we generate heat by burning direct fossil fuels (coal, oil, natural gas) and eventually heat the building through several heat transfer links. In the ideal case where there is no heat loss from the boiler and heating pipelines, primary energy utilization (ie, the ratio of the heat of the building heating to the heating of the fuel) can be up to 100%. However, burning fossil fuels typically produces temperatures in the 1500-1800 ° C range, which are high-grade thermal energy, whereas building heating ultimately requires low-grade thermal energy at 20-25 ° C; direct burning of fossil fuels for building heating means a significant amount Available energy loss. If the first use of high-temperature thermal energy combustion power generation, and then use the electric energy-driven heat pump to absorb low-grade thermal energy from the surrounding environment, the appropriate increase in temperature and heating the building, you can take full advantage of high-grade fuel energy, greatly reducing the Primary energy consumption for heating. The coefficient of performance of a heat-supply heat pump, which is the ratio of heat supplied to consumed electricity, can now reach 3-4; the efficiency of thermal power plants can be as high as 35-58% (high for gas-fired combined cycle power plants). The use of fuel power generation and then heat pump heating, under the conditions of the existing advanced technology, an energy efficiency can reach more than 200%. Therefore, the use of heat pump technology for building heating can greatly reduce the heating fuel consumption, not only saving energy, but also greatly reduce the emissions of CO2 and other pollutants caused by burning fossil fuels. Low-temperature heat sources utilized by heat pumps can generally be the environment (air, surface water and ground) or a variety of waste heat. It should be noted that the heat absorbed by these heat sources by heat pumps is a renewable energy source.
Undermount sinks are sinks installed under the surface of a worktop with a cut out made to the size of the bowl. It is not common for an undermount sink to come with a draining board but rather the idea is that water can be wiped towards the sink. The kitchen tap is installed separately unlike an inset sink and in the case of granite worktops, has a radial cut out to suit the shape of the sink. They are known as a modern kitchen design and are starting to appear more often.
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