Heat exchanger from the form of sub-units, heat pump units can be divided into three general: air heat pump units, water-ring heat pump units and ground-source heat pump units. Air heat pump unit and water ring heat pump unit and ground source heat pump group is different. It is based on air as a heat carrier for heat transfer; and water ring heat pump unit and ground source heat pump through the water as a heat carrier for heat transfer. However, please note that one point: the domestic water ring heat pump units and ground-source heat pump group are often referred to as water source heat pump. In fact, water ring heat pump and ground source heat pump in the working temperature is very different. From the system structure and cold source point of view, the central air conditioning system is also divided into three categories: the traditional central air conditioning system, water pump air conditioning systems and ground source heat pump air conditioning system. The traditional central air conditioning system generally consists of a refrigeration unit (air heat pump unit, chiller, direct gas turbine, etc.), a water circulation system, an exothermic device (cooling tower), a heat source, an indoor heat exchanger, etc. The heat inside the building is exchanged with the atmosphere ; Water ring heat pump air conditioning system consists of water ring heat pump units, water circulation system, closed cooling tower, auxiliary heat source, indoor heat exchanger and other components, the building's heat is still exchanged with the atmosphere; and ground source heat pump air conditioning system from ground source Heat pump units, water circulation systems, soil heat exchangers and indoor heat exchangers. The heat in the building is no longer exchanged with the atmosphere but exchanges heat with soil, groundwater or surface water. Nearly a year or two, the domestic air conditioning sector often appear to temperature air conditioning, ground source heat pump, water source heat pump, the central liquid hot and cold air conditioning and other terms. What is the difference between these systems and the US soil-gas geothermal heat pump system? In fact, most of these air-conditioning systems are derived from or imitated by domestic manufacturers, and the European water-water-based ground-source heat pump system has been transformed. At present, there are two ground-source heat pump technologies being promoted in China. One is China's water-water-based ground-source heat pump technology, developed on the basis of the water-water-based ground-source heat pump technology in Western and Northern Europe by the mid-1990s. The other is based on the Ministry of Science and the US Department of Energy signed the "agreement on the use of geothermal energy cooperation in 2000 from the United States introduced a full set of soil - gas-based ground source heat pump technology. Based on water-water ground-source heat pump technology, American soil-gas ground source heat pump technology was gradually developed and perfected by Americans after the 1980s. It is the most advanced ground source heat pump technology in the world at present. In addition to its three major advantages of environmental protection, energy saving and low operating cost, water-to-water ground-source heat pump technology has its greatest technological development: it can directly take heat from the soil or discharge it to the ground without groundwater Heat, through the dispersedly arranged in each room of the soil-gas pump unit, which directly converted into hot air or cold air heating or cooling room to solve the water-water-based heat pump technology to promote the limited mining encountered Groundwater and recharge difficulties, the two biggest problems. Water-water ground-source heat pump technology was introduced into our country from Europe in the 1990s. In Europe, water-water heat pumps are developed based on the fact that the Nordic climate is not hot in the winter and the colder the summer, mainly to solve local heating problems. It usually takes heat from groundwater or surface water, converts it into hot water through a centralized centralized water-to-water ground-source heat pump unit and sends it to all rooms to heat the room using floor radiant heating. After this technology was introduced into our country, according to the climate characteristics of our country, the domestic manufacturers made the transformation, the radiant floor heating into fan coil heat exchanger, into a dual-use central air conditioning. It also uses groundwater as a heat source to extract heat from groundwater or discharge heat to it. After passing through a centralized centralized water-water geothermal pump unit, it is converted into hot or cold water and then sent to fan coils arranged in various rooms Converted into cold or hot air heating or cooling the room. Domestic water-water heat pump technology and the United States soil-gas heat pump technology are mainly in the following three points: 1, due to the limited heat transfer characteristics of the unit, the domestic water-water ground source heat pump technology mostly use groundwater as hot and cold Source, and the United States soil-type ground-source heat pump technology can not use groundwater, through the ground to the soil as a direct source of cold and heat to extract heat or heat to it. At present, the biggest difficulty encountered in the promotion of domestic water-water geothermal pump technology is the limitation of exploitation of groundwater and recharge in major cities. The soil-gas ground source heat pump technology can remove heat directly from the soil without groundwater, which solves the difficulties encountered in the popularization of large cities and makes the soil-type ground source heat pump technology in a large scale such as Beijing and other large cities Promotion is possible, a wider range of applications. 2, Domestic water-water ground source heat pump technology is still a centralized arrangement, while the US soil-gas ground source heat pump technology adopts a more flexible and decentralized arrangement to achieve household-based measurement in an absolute sense. 3, the energy conversion and transmission process is different. The soil-gas ground source heat pump technology eliminates the process of generating hot water and chilled water and improves the conversion efficiency of the unit. Therefore, the earth-gas ground source heat pump technology has higher heat exchange efficiency and lower running costs.
We diviided the led light according to the using eviiroment. Most of our product is the commercial LED Lighting
Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
Pendant Light Kits,E26 Led Pendant Light,E27 Led Pendant Light,Pendant Light Fixture Led
Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.jmdilinled.com