CN203231439U - An energy recovery type fresh air air handling unit - Google Patents

Abstract

The utility model provides an energy recovery type all fresh air handling unit. The unit comprises a fresh air heat exchange cavity and an exhaust heat exchange cavity. The fresh air heat exchange cavity comprises a filtering section, a thermal and humidity processing section and a fresh air outlet section. The filtering section comprises a novel air inlet and an air filter. The thermal and humidity processing section comprises a finned tubular heat exchanger, a four-way reversing valve, a gas-liquid separator, a compressor and a one-way valve. The fresh air outlet section comprises a fan and a fresh air outlet. The exhaust heat exchange cavity comprises an exhaust inlet section, a heat recovery section and an exhaust outlet section. The exhaust inlet section comprises an exhaust inlet and a filter. The heat recovery section comprises a plate heat exchanger, solenoid valves and a finned tubular heat exchanger. The exhaust outlet section comprises a fan and an exhaust outlet. The plate heat exchanger is used for recovering condensation heat, so that the exhaust outlet section comprises a fan and an exhaust outlet. The system operation conditions can be adjusted according to the specific environment temperature, the heat recovery amount and the like to enable the unit to operate under the optimum condition, and targeted supply can be achieved according to the hot water demanded quantity of users.

Description

An energy recovery type fresh air air handling unit

technical field

The utility model relates to an energy recovery type fresh air air handling unit, which belongs to the technical field of air conditioning engineering. the

Background technique

The fresh air air handling unit is a kind of air handling equipment that provides fresh air indoors. Its working principle is to extract fresh air outdoors, after cooling (heating), dehumidification, cleaning, etc., and then send it into the room through the fan to replace The original air in the room is used to meet the requirements of the indoor personnel for high-quality air. Compared with the centralized air conditioning system, the fresh air air handling unit can not only ensure the quality of indoor fresh air, but also has incomparable advantages in preventing cross-infection of viruses and bacteria and the spread of bad odors. the

At present, in the design of air conditioners, the cooling load index is generally taken as 100-150W/m ² . When operating under air-conditioning conditions, the condensation heat can reach 1.15-1.30 times the cooling capacity. It can be seen that the energy of the refrigerator is quite large, and the fresh air air handling unit In the process, the heat taken away by the exhaust air is naturally discharged, which will inevitably cause atmospheric heat pollution, aggravate the "urban heat island effect", and also deteriorate the operating environment of the air conditioning unit, increase the energy consumption of the air conditioner, and if the effective device is used, it will The recovery and utilization of this part of condensation heat is an energy-saving way to turn waste into wealth, and it is also an important research topic.

Based on the shortcomings of existing air handling units, this utility model designs an energy recovery type fresh air air handling unit. the

Contents of the invention

The problem to be solved by the utility model is to overcome the deficiencies of the prior art, recover the exhaust heat of the unit to the greatest extent, and make effective use of it. Based on this, an energy recovery type fresh air air handling unit is proposed, which uses a water-cooled plate heat exchange The condenser recovers condensation heat, and can adjust the operating conditions of the system according to the specific ambient temperature, heat recovery amount, etc., so that the unit can operate in the best condition, and supply hot water in a targeted manner according to the user's demand for hot water. the

The technical scheme that the utility model adopts is as follows:

An energy recovery type fresh air air handling unit, including a shell, and a metal partition divides the inside of the shell into a fresh air heat exchange chamber and an exhaust air heat exchange chamber. The fresh air heat exchange chamber includes a filter section, a heat and humidity treatment section and Fresh air outlet section: the filter section includes a fresh air inlet and an air filter located at the fresh air inlet, and the heat and humidity treatment section includes a first finned tube heat exchanger, a four-way reversing valve, a gas-liquid separation The fresh air outlet section includes the first fan and the fresh air outlet; the exhaust air heat exchange cavity includes the exhaust air inlet section, the heat recovery section and the exhaust air outlet section: the exhaust The air inlet section includes an exhaust air inlet and a filter located at the exhaust air inlet, and the heat recovery section includes a plate heat exchanger, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve , the fifth electromagnetic valve and the second finned tube heat exchanger, the exhaust air outlet section includes the second fan and the exhaust air outlet; Type heat exchanger, gas-liquid separator and compressor are connected, and the other one is divided into two branches: the first branch is connected with the plate heat exchanger through the first solenoid valve, and the second branch is connected with the plate heat exchanger through the third The solenoid valve and the fourth solenoid valve are connected to the second finned tube heat exchanger; the first finned tube heat exchanger is connected to the second finned tube heat exchanger through an expansion valve, and at the same time The five solenoid valves and the second solenoid valve are connected between the third solenoid valve and the fourth solenoid valve; the plate heat exchanger is connected with the heat storage tank outside the housing through a hot water regulating valve.

Since the plate heat exchanger has the advantages of compact structure, small footprint, light weight, high heat transfer efficiency, and small structural thermal resistance, the use of plate heat exchangers as heat recovery condensers can achieve energy saving and high efficiency. . The heat recovery device is designed in the form of all heat recovery, which utilizes almost all condensation heat and has a large amount of heat recovery. the

In summer working conditions, the exhaust fan introduces the indoor exhaust air into the exhaust air inlet. After being filtered, it enters the heat recovery section for treatment and then is discharged to the outside through the exhaust air outlet. At the same time, the outdoor fresh air enters the heat and humidity treatment section after being filtered. The device absorbs the heat of the fresh air to cool it down, and then sends it into the room through the fan for continuous circulation to provide high-quality fresh air to the room. There are two forms of condensation heat recovery in this process: the plate heat exchanger and the finned tube heat exchanger operate in series and parallel operation, and the plate heat exchanger can operate alone as a condenser to supply hot water. When running in series, the pressure regulating valve is used to control the pressure of the condensing agent at the outlet of the plate heat exchanger to ensure the condensation temperature and heat recovery of the finned tube heat exchanger. It is used to adjust the flow of hot water and control the amount of heat recovery to ensure the normal operation of the unit. When running in parallel, the heat recovery is stable and the heat recovery can reach 100%. Compared with the series structure, the system requires less refrigerant charge. the

In winter working conditions, the indoor exhaust air enters the exhaust air heat exchange cavity through the exhaust air inlet, and after being filtered by the filter, it exchanges heat with the evaporator. , The outdoor fresh air enters the fresh air heat exchange cavity through the fresh air inlet, and enters the condensation section after being filtered. After the heat exchange between the fresh air and the condenser, the temperature rises and enters the room. In this process, only the finned tube heat exchanger works, but it absorbs the heat of the indoor exhaust air and realizes the purpose of energy recovery. the

Compared with the prior art, the utility model has the following beneficial effects:

1. The plate heat exchanger is used to achieve maximum energy recovery, which improves energy utilization and reduces environmental heat pollution.

2. The operating conditions of the system can be adjusted according to different heat recovery, water temperature and ambient temperature, so that the unit can operate under the best conditions, and at the same time, it can meet the different needs of users for hot water. the

3. Recovery of condensation heat provides users with domestic hot water, reducing the consumption of electric energy or gas boilers for heating, and saving users' expenses. the

Description of drawings

Fig. 1 is a schematic diagram of the principle of the energy recovery type fresh air air handling unit of the present invention. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail. the

As shown in Figure 1, the energy recovery type fresh air air handling unit includes a shell 15, and a metal partition 12 divides the shell 15 into a fresh air heat exchange chamber 3 and an exhaust air heat exchange chamber 16. In the fresh air heat exchange cavity 3, there are filter section, heat and humidity treatment section and fresh air outlet section, wherein the filter section includes fresh air inlet 1 and air filter 2, and the heat and humidity treatment section includes finned tube heat exchanger 4, Expansion valve 5, four-way reversing valve 6, gas-liquid separator 7, compressor 9 and one-way valve 8, fresh air outlet section includes fan 10 and fresh air outlet 11; exhaust air heat exchange cavity 16 is divided into exhaust Air inlet section, heat recovery section and exhaust air outlet section, wherein the exhaust air inlet section includes exhaust air inlet 13, filter 14, and the heat recovery section includes plate heat exchanger 18, hot water regulating valve D1, solenoid valve D2, D3, D4, D5, D6 and the finned tube heat exchanger 17, the exhaust air outlet section includes an exhaust air outlet 21 and a fan 20. Tap water enters the plate heat exchanger 18 to exchange heat, and after being heated, enters the hot water storage tank 22 through the hot water regulating valve D1 for use by users. the

Summer working conditions: the exhaust fan 20 in the exhaust heat exchange cavity 16 introduces the indoor exhaust air into the exhaust air inlet 13, and after being filtered, enters the heat recovery section for treatment, and is discharged to the outside through the exhaust air outlet 21; At the same time, the outdoor fresh air enters the heat-humidity treatment section after being filtered, and the finned tube heat exchanger 4 (the evaporator at this time) absorbs the heat of the fresh air to cool it down and sends it into the room through the fan 10 to provide high-quality fresh air to the room, and This cycle continues. The condensation heat recovery form of this process is:

1. The plate heat exchanger and the finned tube heat exchanger operate in series

Refrigerant liquid passes through the evaporator, absorbs the heat of outdoor fresh air and becomes a high-temperature and low-pressure gas, and after being compressed by the gas-liquid separator 7 and compressor 9, it becomes a high-temperature and high-pressure gas. At this time, the solenoid valves D2, D3, and D5 are opened and closed. Solenoid valves D4 and D6, the superheated saturated steam enters the plate heat exchanger 18 through the solenoid valve D2 for heat exchange with water, provides hot water, and then sends it to the finned tube heat exchanger 17 through the solenoid valves D3 and D5 (at this time it is Condenser) to dissipate the remaining heat, and then send it to the evaporator after the pressure is reduced by the expansion valve 5, and the refrigeration cycle is carried out.

2. The plate heat exchanger and the finned tube heat exchanger operate in parallel

The refrigerant liquid passes through the evaporator, absorbs the heat of the outdoor fresh air and vaporizes into a high-temperature and low-pressure gas, which is compressed by the compressor 9 to become a high-temperature and high-pressure gas. At this time, the solenoid valves D2, D4, D5, and D6 are opened, and the solenoid valves are closed. D3, part of the refrigerant gas enters the plate heat exchanger 18 to heat water through the solenoid valve D2, and part of it is sent to the finned tube heat exchanger 4 through the solenoid valves D4 and D5, and the two parts of the refrigerant liquid are combined and then decompressed through the expansion valve 5 , After becoming a low-temperature and low-pressure liquid, it enters the evaporator and performs a refrigeration cycle.

3. Only the plate heat exchanger runs

The refrigerant liquid turns into a high-temperature and low-pressure gas after passing through the evaporator, and becomes a high-temperature and high-pressure gas after being compressed by the compressor 9. At this time, open the solenoid valves D2 and D6, close the solenoid valves D3, D4, and D5, and the refrigerant gas passes through the solenoid valves After D2 is sent to the plate heat exchanger 18 to exchange heat with water, the water is heated, the heat is transferred to the water, and the hot water is sent to the hot water storage tank 22 for use by users. At this time, the refrigerant changes from a high-temperature and high-pressure gas to a low-temperature and high-pressure gas. The liquid, after being depressurized by the expansion valve 5, becomes a low-temperature and low-pressure liquid, and then sent to the evaporator for refrigeration cycle.

Working conditions in winter: the indoor exhaust air is introduced into the exhaust air heat exchange chamber 16 by the exhaust air fan 20 through the exhaust air inlet 13, filtered by the filter 14, and connected with the finned tube heat exchanger 17 (at this time, the evaporator ) for heat exchange, after the heat exchange, the temperature of the exhaust air decreases, and it is discharged to the outside through the exhaust air outlet 21. At the same time, the outdoor fresh air is introduced into the fresh air heat exchange chamber 3 by the fresh air fan 10 through the fresh air inlet 1, and enters the condensation after being filtered In the section, the fresh air enters the room after exchanging heat with the condenser 4 and the temperature rises. In this process, when the electromagnetic valves D4 and D5 are opened, only the finned tube heat exchanger 17 works, but it absorbs the heat of the indoor exhaust air, realizing the purpose of energy recovery. the

Claims (1)

1. the brand-new wind air-treatment of an energy recovery type unit comprises housing, it is characterized in that, metal partion (metp) is divided into new air heat-exchange cavity and air draft heat exchange cavity with enclosure interior,

The new air heat-exchange cavity comprises fillter section, hot wet process section and new wind air outlet section: described fillter section comprises new wind air inlet and is positioned at the air cleaner at new wind air inlet place, described hot wet process section comprises first fin-tube heat exchanger, four-way change-over valve, gas-liquid separator, compressor and check valve, and described new wind air outlet section comprises first blower fan and new wind air outlet;

Air draft heat exchange cavity comprises air draft air inlet section, heat-recovery section and air draft air outlet section: described air draft air inlet section comprises the air draft air inlet and is positioned at the filter at air draft air inlet place, described heat-recovery section comprises plate type heat exchanger, first magnetic valve, second magnetic valve, the 3rd magnetic valve, the 4th magnetic valve, the 5th magnetic valve and second fin-tube heat exchanger, and described air draft air outlet section comprises second blower fan and air draft air outlet;

Three tunnel of described four-way change-over valve links to each other with first fin-tube heat exchanger, gas-liquid separator and compressor respectively, other one the tunnel is divided into two branch roads: first branch road links to each other with described plate type heat exchanger by first magnetic valve, and second branch road links to each other with described second fin-tube heat exchanger with the 4th magnetic valve by the 3rd magnetic valve;

Described first fin-tube heat exchanger links to each other with second fin-tube heat exchanger by expansion valve, is connected between the 3rd magnetic valve and the 4th magnetic valve by the 5th magnetic valve, second magnetic valve simultaneously;

Described plate type heat exchanger is connected by the outer hot water storage tank of hot water control valve and housing.

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