Is the heat exchange of villa split system a direct system?

(1) can be divided into water cooling and air cooling according to cooling methods. Water-cooled with water as cooling medium, such as water-cooled heat pump unit. Air-cooled type takes air (forced ventilation) as cooling medium, such as air-cooled heat pump unit. (2) According to the function classification, it can be divided into cold (hot) water unit, direct cooler and air duct unit. The cold (hot) water unit can deliver cold water or hot water to indoor terminal equipment (such as fan coil units); A direct cooler, such as a multi-split machine, completes refrigeration or heating by vaporizing or condensing refrigerant in an evaporator or condenser. The air duct unit can blow cold air or fresh air to different rooms through the air duct. (3) According to the equipment type, it can be divided into multi-machine split type, air-cooled heat pump type, VRV frequency conversion control type, water source heat pump type, ground source heat pump type, water-cooled heat pump type and absorption type. (1) Multi-machine split type, also known as multi-type, such as type II and type III, is suitable for one room, one hall and two rooms. (2) Air-cooled heat pump type, also known as household or compound air conditioner. Outdoor units are mainly used, which can be hung or erected in hidden places or placed on the roof. Indoor machines are wall-mounted, ceiling-mounted, ceiling-mounted and cabinet-mounted. This kind of air conditioner is suitable for general rooms, villas, apartments and supermarkets. @VRV frequency conversion control system (hereinafter referred to as VRV system), also known as multi-zone assembled central air conditioning system, was initiated by Daikin Company of Japan. One outdoor unit of the system can carry 8 or more indoor units. Outdoor units can be placed on the roof, and the wiring length between indoor units can reach 100m, even if the building is 15 floors. VRV system adopts various control modes, and can control up to 256 indoor units in an independent control system. In addition to the general form, VRV system household central air conditioning also includes H heat recovery series, K heat recovery series and frequency conversion K series. ④ Water source heat pump is an air conditioning system with heat recovery, which has more obvious advantages in energy saving, especially in transitional seasons and winter. Water source heat pump unit, cooling tower, heater, circulating water pump, water pipe loop, water system control box and indoor temperature controller form an air conditioning system. There are many kinds of outdoor hosts, such as horizontal, vertical and floor-standing, which are integrated and separated, and there are many forms of indoor air conditioning. ⑤ Ground source heat pump is a system that provides air conditioning, heating and domestic hot water to rooms with less investment. The biggest feature of ground source heat pump system is that it does not need general fuel. Air conditioning is a ground source heat pump, which uses closed pipes buried underground or submerged in lakes and ponds to collect or release heat from nature as energy to realize air conditioning and heating. Not only saves energy, but also has no pollution to the environment. This new air-conditioning heating method has a history of more than 30 years and has been widely used in the United States and Canada. ⑥ Water-cooled heat pump air conditioner adopts tap water circulation cooling, which is suitable for household heat pump units. ⑦ Absorption small central air conditioner is an absorption refrigerator with artificial gas, liquefied petroleum gas, natural gas and other fuels as energy source, which can produce cold water of 7℃ for air conditioning, and is suitable for residential and commercial buildings. There are single cooling type and cold and warm type to choose from. (4) According to the different classification of cold and heat load conveying media. According to the different conveying media of cold and heat load, household central air conditioning can be divided into three types: cold and hot water system (conveying medium is water), air duct system (conveying medium is air, also known as all-air system) and VRV system (conveying medium is refrigerant). (a) Domestic central air conditioning with cold and hot water systems; (b) Duct system, household central air conditioning; (c)VRV system home central air conditioning.