How to choose the reheat process in the all air primary return air reheat air conditioning system

If possible, the secondary return air method should be used, which is more energy-saving.

If reheating is necessary, a heating section can be added to the combined air conditioning unit.

Basic Principles for Air Conditioning System Selection:

1) The selection of air conditioning system should fully consider the type, function, scale, meteorological conditions and energy conditions of the city where the building is located.

2) The selected air-conditioning system must ensure the design parameters of the building's interior, that is, to meet the requirements of temperature and humidity, fresh air volume and comfort.

3) Fully consider the initial investment and operating costs to meet the requirements of economic reasonableness.

Analysis and comparison of different air conditioning systems:

The system with the thermal and humid environment of the building as the main control object, according to the different media that bear various loads of the building, the air conditioning system is divided into full air system, all water system, air-water system and refrigerant system.

1. Full air system.

In an all-air system, the indoor air conditioning load is entirely borne by the treated air. The all-air system has several advantages:

1) The equipment is simple, saving the initial investment;

2) The temperature and humidity in the room can be strictly controlled;

3) It can realize energy-saving operation and adjustment under multiple working conditions throughout the year, and has good economy.

The all-air system treatment scheme has a primary return air system and a secondary return air system. The characteristics of both systems are summarized as follows:

1) Primary return air system: fresh air and return air are mixed in front of the hot and humid treatment equipment. When the temperature difference of the room air supply can be large or the indoor humidity dissipation is large, the primary return air system can be considered.

2) Secondary return air system: fresh air and return air are mixed in front of the heat and humidity treatment equipment and mixed with the return air again after treatment. The secondary return air system is suitable for places where the temperature difference of the supply air is limited and the heat source is not allowed to be reheated.

The secondary return air system uses the return air to save part of the reheat energy and save energy. However, the system is more complex than the primary return air system.

2. Whole water system.

A system in which all the treated water is used to bear the heat and humidity load in an air-conditioned room, and is called a total water system. Since the specific heat of water is larger than that of air, the volume of the all-water system is smaller than that of the all-air system, saving the space used in the building. However, the all-water system cannot solve the problem of ventilation in air-conditioned rooms.

3. Air-water system.

Air-water systems use both air and water to absorb the heat and humidity load in an air-conditioned room. Common ones are fan coil unit plus fresh air system and air-water inducer system. The fan coil unit plus fresh air system has the following characteristics:

1) The layout is flexible, and it can be used in combination with the centralized fresh air system, or it can be used alone;

2) The temperature and humidity can be adjusted independently, and each air-conditioned room does not interfere with each other;

3) Only a new fan room is needed, which does not occupy the area of the building machine room.

4. Refrigerant system.

The refrigerant system is to place the evaporator of the refrigeration system directly indoors to absorb waste heat and humidity. This method is generally used for decentralized installation of local air conditioning units, but because the refrigerant pipeline is not convenient for long-distance transportation, the refrigerant system has certain limitations in scale.

Said in the form of hot **? Or is it a regular air conditioner?

The air conditioner consists of four parts: refrigeration system, ventilation system, electrical control system and box system.

1. The refrigeration system is the most basic system of each air conditioner, and it is the main part of the refrigeration or heating function of the air conditioner;

The ventilation system is the part that realizes the heat exchange, which sends the cold energy generated by the refrigeration system to the interior and the heat in the condenser to the outside;

2. Electrical control is the operating system of the air conditioner, there are two ways: mechanical control and electronic control, with which the air conditioner can work according to people's wishes;

3. The box system is the supporting base frame of the air conditioner, and various parts are installed on it. The four systems are combined according to their respective functions to form a complete air conditioner.

Air supply system, exhaust system, air conditioning (cold and hot) water system, condensate system, cooling water system, energy storage system, compression refrigeration (heat) equipment system, multi-line (heat pump) air conditioning system, solar heating and air conditioning system, equipment automatic control system.

Shanghai Herun HVAC Equipment Engineering Co., Ltd. is a comprehensive and qualified HVAC equipment engineering company, which is an enterprise specializing in the design, sales, installation and after-sales service of air conditioning systems (water systems and fluorine systems), fresh air systems, air purification, ground source heat pump systems, and intelligent energy-saving control systems. With leading technical strength, high-quality service and reputation, the company has won a good reputation in the industry, and has won the trust and praise of new and old customers in various regions. The service objects include ZF, Parker Hannifin, BASF Chemical, Dow Chemical, Faurecia, Biomin, Carl Zeiss, Baomit, Trützler, HYDECK, Velcro, Carrier R&D Center, C919 Commercial Aircraft Manufacturing Base, Tianyu Ecology, Shanghai Chuangyi Industrial, L'Oreal, Bomag, WeWork, Chint Electric, etc.

Compressors, heat exchangers and piping, throttling mechanisms, fan duct systems, electrically assisted heat, air exchange, filter parts, etc., I hope to help you!

First, the control system.

Second, the refrigeration system.

1.Compressor.

2.Condenser.

3.Throttling device.

4.Evaporator.

1.Compressor.

2.Condenser.

3.Radiator.

4.Enclosure. 5.Controller.

Your circuit system.

Compressor capillaries.

Evaporator condenser.

1.Compressor.

2.Condenser.

3.Radiator.

4.Feed in the air.

5.Controller.

Lonely mountain man.

Air conditioning systems are divided into the following types:

1. All air.

DU system zhi

All-air system also.

The temperature in the room is controlled by the treated air capacity.

2. Whole water system.

This kind of system uses water as the medium to control the heat and cold in the room, and the incomplete water system cannot solve the ventilation function in the room, and is generally not used alone.

3. Air-water system.

This system combines two temperature control methods, the all-air system and the all-water system, and adds ventilation capacity on the basis of the all-water system.

4. Refrigerant system.

The temperature control of the refrigerant system is undertaken by the refrigerant, and in the absence of the refrigerant, the system cannot play the role of temperature control.

5. Fresh air system.

The fresh air system is an independent air handling system composed of an air system and an exhaust air system, which is composed of a fresh air fan and pipe fittings, which purifies the outdoor air through the fresh air fan and introduces it into the room, and finally discharges the indoor air through the pipe.

There are 4 types of household air conditioners:

Wall-mounted air conditioner.

Wall-mounted air conditioners are popular, and technology is constantly evolving. You should pay attention to the functional differences between brands.

The ventilation function is the latest technology used in wall-mounted air conditioners to ensure that there is fresh air in the home, prevent the occurrence of air conditioning diseases, and make it more comfortable and reasonable to use.

In addition, it is important to be silent and energy-efficient so that you can sleep until dawn. Some wall-mounted air conditioners have ultra-small outdoor units, which are also a good choice if you plan to put the outdoor units on the balcony.

As for the wall-mounted air conditioner of the cooling and heating type, it is necessary to pay attention to the choice of the air conditioner whose heating capacity is greater than the cooling capacity to ensure the heating effect. If there is an electric auxiliary heating function, it can ensure that it can be heated even in an ultra-low temperature environment (as low as -10 degrees Celsius) (the temperature of the air outlet is more than 40 degrees Celsius).

Vertical cabinet air conditioner.

To regulate the temperature in a large area, such as a large living room or commercial premises, a vertical cabinet air conditioner is the most suitable.

When choosing, you should pay attention to whether there is a negative ion sending function, because this can clean the air and ensure health. Some vertical cabinet air conditioners have a mode lock function, and the operation status is controlled by the owner, which will be more useful for commercial places or families with children at home, which can avoid unnecessary damage.

In addition, it is also important to have a long enough air supply range. At present, the maximum distance of air supply of vertical cabinet air conditioner can be greater than 15 meters, and with the wide-angle air supply, a larger area can be taken into account.

Window air conditioning. Easy to install, inexpensive, suitable for small rooms. When choosing, it is necessary to pay attention to its silent design, because the window unit is usually noisier than the split air conditioner, so it is better to choose a window machine that is close to the noise standard of the split air conditioner. In addition to the traditional window air conditioner, there are also novel models, such as a color-paneled children's machine designed for children, with voice prompts, which is both lively and practical and safe, and is also a good choice.

The innovative air conditioning design concept of ceiling air conditioner, the indoor unit is hoisted on the ceiling, and the air supply is wide angle on all sides, and the temperature is adjusted quickly, and it will not affect the interior decoration.

According to the function of the air conditioner, the air conditioner can be divided into single cooling air conditioner and cold and warm air conditioner. Single-chilled air conditioner: does not have a heating function, and is suitable for areas with hot summer or sufficient heating in winter**. Heating and cooling air conditioner: with heating function.

According to its heating method, it can be divided into heat pump type and electric auxiliary heating type. The heat pump type is suitable for areas with hot summer and cold winter; The electrically assisted heating type is suitable for areas with hot summers and cold winters due to the addition of electrically assisted heating parts, which makes heating strong.

The above air conditioners can also be divided into the following according to the temperature regulation: single cooling type: only used for refrigeration, suitable for areas with warm summer or sufficient heating in winter.

Cooling and heating type: with heating and cooling functions, it is suitable for hot areas in summer and cold in winter. Electrically Assisted Heating Type:

The electric auxiliary heating function is generally only used in high-power cabinet air conditioners, and the electric auxiliary heating components are added to the fuselage to ensure strong heating in winter. However, in the northern regions, where heating is more abundant in winter, it does not seem necessary.

1. Classification according to the setting of air-conditioning equipment:

1) Centralized air-conditioning system: The centralized air-conditioning system is to centralize all kinds of air handling equipment and fans in a special machine room to centralize the air treatment, and then the air supply system will send the processed air to each air-conditioning room.

2) Semi-centralized air-conditioning system: In addition to the centralized air treatment room, there is also a secondary treatment equipment in each air-conditioned room to further supplement the air from the centralized treatment room.

3) Fully decentralized air-conditioning system: an air-conditioning unit that assembles air handling equipment, fans, automatic control systems, cold and heat sources, etc., and directly places them in the air-conditioned room to process the air on the spot.

2. Classification according to the type of medium used to bear indoor load:

1) Total air system: An air-conditioning system in which the heat and humidity load in the air-conditioned room are all borne by the treated air.

2) All-water system: The heat and humidity load in the air-conditioned room are all borne by water as the cold and hot medium.

3) Air-water system: The heat and humidity load of the air-conditioned room is borne by the treated air and water.

4) Refrigerant direct evaporation system: This is an air-conditioning system in which the evaporator of the refrigeration system is directly placed indoors to absorb the heat and humidity load of the room.

3. Classified according to different service objects: comfort air conditioning and process air conditioning. Comfort air conditioners are usually used in homes or public places; Process air conditioners are usually used in factories, laboratories and other occasions with special requirements for air.

As shown in the figure, it is a fresh air unit, which belongs to a centralized air conditioning system. Its working principle is: outdoor fresh air enters the air handling room through the fresh air outlet, removes the dust in the air conditioner through the filter, and then passes through the treatment of the surface cooler, heater and other equipment to make the air reach the temperature and humidity required by the design, and the air supply fan is sent to the air duct system through the air volume control system to reduce the noise, and then sent to the air conditioning room by the air outlet through the air volume adjustment device of each room, and after absorbing the waste heat and humidity in the room, it is discharged from the air return outlet through the air duct.

Air conditioning system.

There are three kinds of classification according to the BAI setting of air handling equipment: 1 centralized system, 2 semi-centralized system, 3 fully dispersed system, according to the type of medium used to bear the indoor load: 1 full air system, 2 full water system, 3 air water system, 4 refrigerant system, according to the centralized air conditioning system to deal with the air ** divided into:

1 closed system, 2 DC system, 3 hybrid system.

There are three types of air conditioning system classification: according to air.

The settings of the DU processing equipment are classified as follows: DAO1 centralized system, 2 semi-centralized systems.

The system in the version, 3 full decentralized system according to the type of medium used to bear the indoor load is divided into: 1 full air system, 2 full water system, 3 air water system, 4 refrigerant system according to the centralized air conditioning system to deal with the air ** divided into: 1 closed system, 2 direct flow system, 3 mixed system.

Air conditioners are mainly divided into two categories: ** air conditioners and single air conditioners.

Classification according to structure: integral type is also called window type and split type air conditioner 2, according to the function classification: single cooling type and cold and hot type.

3. Classification according to the mode of operation: ordinary, wire-controlled and remote control 4. Other classification methods: the indoor unit is mathematically divided into one tractor.

two, one drag three; The climate and environment are classified as T1, T2 and T3 types, and T1 air conditioners are generally used in China.