Heat pump works as a natural phenomenon, just as water flows from low to high, as the heat is always from high temperature to low temperature. But people can create machines that use water pumps to pump heat from low to high temperatures, just as water is raised from low to high. Therefore, the heat pump is essentially a heat lifting device, which itself consumes a part of the energy, excavates the stored energy in the environmental medium and increases the use of the temperature. The heat pump consumes only a third of the heat One or lower, which is also the energy-saving features of the heat pump. The principle of heat pump and refrigeration is the same as that of system equipment. The system of vapor compression heat pump (refrigeration) mainly consists of compressor, evaporator, condenser and throttle valve. The compressor plays a role of compressing and conveying circulating working fluid The role of the heat pump (cooling) system from the low temperature and low pressure to the high temperature and pressure Department; evaporator is the output of cold equipment, its role is to make the refrigerant flowing through the throttle valve liquid evaporation to absorb the object being cooled Of the heat, to achieve the purpose of refrigeration; condenser is the output of heat equipment, heat absorbed from the evaporator along with the compressor power of work by the heat transferred in the condenser cooling medium away, to achieve the purpose of heating; expansion valve Or throttle on the working fluid play a role in throttling and depressurization, and regulate the flow of refrigerant into the evaporator cycle. According to the second law of thermodynamics, the power consumed by the compressor (electric energy) plays a compensating role, so that the circulating working fluid continuously absorbs heat from the low-temperature environment and radiates heat to the high-temperature environment and cycles cyclically. Heat pump classification Heat pump is the need for the condenser heat, the evaporator is removed from the environment, this time from the environment to heat the object is called the heat source; the opposite is the need to cool the evaporator, the condenser heat to the environment, this When the object to the environment heat is called cold source. Evaporator condenser according to the circulating refrigerant and the environment of the heat transfer medium is divided into two main forms of air heat exchange and water heat exchange. This heat pump or refrigerator according to the environment and the heat transfer medium can be divided into water - water, water - air, air - water, and air - air four categories. The use of air as a heat source heat pump, called the air source heat pump. Air source heat pump has a long history, and its installation and use are very convenient, widely used. However, due to the difference of regional air temperature, the typical application in our country is south of the Yangtze River. In North China, average winter temperatures are below zero degrees Celsius. Air-source heat pumps are not only run in poor conditions, poor stability, but also inefficient because of frost formation. The use of water as a heat source heat pump, called water source heat pump. Water is an excellent heat source. Its heat capacity is large and its heat transfer performance is good. Generally, the efficiency and capacity of cooling and heating of water source heat pump are higher than that of air source heat pump. However, the application of water source heat pump is much less than that of air source heat pump due to the limitation of water source. Ground source heat pump working principle and classification Ground source heat pump is the use of water source heat pump in a form that is the use of water and ground energy (groundwater, soil or surface water) for cold and heat exchange as a source of heat pump heat source, the winter Earth's heat in the "take" out, supply indoor heating, at this time for the "heat source"; Summer heat to the room, released into the groundwater, soil or surface water, at this time can be "cold source." Ground source heat pump heating air conditioning system is divided into three parts: outdoor heat exchange system, water source heat pump units and indoor heating air conditioning terminal system. Water source heat pump which there are two main forms: water - water or water - air type. Heat transfer between the three systems * water or air heat exchange medium, heat exchange medium between water source heat pump and ground energy is water, and heat exchange medium of building heating and air conditioning end can be water or air. Compared with air source heat pump ground source heat pump, there are many advantages: (1) small temperature fluctuations throughout the year. Winter temperature is higher than the air temperature, summer air temperature is lower than the ground, so the ground source heat pump heating, cooling factor is higher than the air source heat pump, generally higher than 40%, so energy saving and cost savings of about 40%. (2) Winter operation does not require defrosting, reducing frost and defrosting losses. (3) ground source has a better energy storage effect. Ground source classification According to the different ways of outdoor heat exchange can be divided into three categories: 1. Soil buried coil system, 2. Groundwater system, 3. Surface water system. According to whether the circulating water is a closed system, the ground can be divided into closed-loop and open-loop system. Closed-loop systems such as buried coil (vertical or horizontal buried pipe), surface water to place the heat exchanger. Open-loop systems such as pumping groundwater or surface water. In addition, there is a "direct expansion" that does not use intermediate water to transfer heat as the system described above. Instead, a heat exchanger (evaporator) of the heat pump is directly buried for heat exchange. Application of ground source heat pump Ground source heat pump applications from the application of building objects can be divided into two major categories of domestic and commercial, from the transport of cold and heat can be divided into centralized systems, decentralized systems and hybrid systems. Home system users use their own heat pump, ground and water or duct delivery system for hot and cold supply, and more for small houses, villas and other household air-conditioning. Centralized heat pump system is arranged in the engine room, hot and cold concentrated through the air duct or water distribution system to the rooms. Dispersing system with a central pump, the water loop to the water to the user as a cold source of heat, users use their own heat pump unit to regulate the air. Generally used in office buildings, schools, commercial buildings, etc., this system can be fully used in the user's cold and heat on the electricity, easy to measure, applicable to the current independent heat measurement requirements. Hybrid Systems Combine ground sources with cooling towers or heating boilers as systems for cold and heat sources. The hybrid system is very similar to the decentralized system, except that cooling towers or boilers are added to the cold and heat source system. In the south, the cooling load is large and the heat load is low. It is suitable for the combined use of ground source and cooling tower in summer and only the ground source in winter. In the north, the heat load is large and the cooling load is low. In winter, it is suitable for the combined use of ground sources and boilers. In summer, only the ground source is used. This will reduce the capacity and size of the ground source and save on investment. Dispersing systems or hybrid systems are essentially water ring heat pump air conditioning systems.
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