CN201203218Y - Heat-humidity separate treatment air-conditioning unit with multiple chilled water temperatures - Google Patents

Abstract

Separate treatment of heat and moisture at multiple chilled water temperatures The compressor (1), condenser (2), liquid receiver (3), and filter (4) of the air-conditioning unit are connected to each other at their input ends, and the output ends of the filter pass through the first The electronic expansion valve (5) is connected to the first evaporator (6), and connected to the second evaporator (8) through the second electronic expansion valve (7); the output end of the first evaporator is connected to the first input end of the compressor (1a ), the output end of the second evaporator is connected to the second input end (1b) of the compressor; the chilled water output end of the first evaporator is connected to the input end of the first water pump (9), and the output end of the first water pump is connected to the floor radiation The input end of the coil (10) and the output end of the floor radiant coil are connected to the chilled water input end of the first evaporator; the chilled water output end of the second evaporator is connected to the input end of the second water pump (11), and the second water pump The output end of the auxiliary fan coil unit (12) is connected to the input end of the auxiliary fan coil unit, and the output end of the auxiliary fan coil unit is connected to the input end of the second evaporator.

Description

Heat-humidity separate treatment air-conditioning unit with multiple chilled water temperatures

technical field

The utility model relates to a water chiller capable of independent heat and humidity treatment, which uses floor radiation to bear indoor sensible heat load, and an auxiliary fan coil unit to bear indoor humidity load, and an air treatment method thereof, which belongs to the technical field of design and manufacture of refrigeration and air-conditioning systems.

Background technique

With the improvement of people's living standards, the requirements for the comfort of work, study and living environment are getting higher and higher, and air conditioners are widely used. However, with the depletion of fossil energy, energy shortage has become an important problem facing the development of the world , How to achieve energy saving on the basis of meeting people's comfort needs is very important. The floor radiant cooling technology has such characteristics. The floor radiant cooling has the advantages of high comfort and energy saving. However, one of the biggest problems in floor radiant cooling is that the surface of the floor is prone to "condensation", which seriously hinders the development and application of floor radiant cooling technology. Most of the existing floor radiant cooling system solutions adopt the combination of chiller + floor radiant coil and displacement ventilation system, or the combination of chiller + floor radiant coil and solution dehumidification. The system equipment is huge, the initial investment is high, and the control is complicated, which reduces the economy of the entire air-conditioning system.

Contents of the invention

Technical problem: The purpose of this utility model is to solve the problems of complex system, large initial investment and low control precision in the existing floor radiant cooling system, and propose a multi-chilled water cooling system with simple system, high control precision and good economic performance. The heat and humidity of the temperature are treated separately by the air conditioning unit.

Technical solution: In the air conditioner for separate treatment of heat and humidity at multiple chilled water temperatures in this utility model, the outlet of the compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the liquid storage, and the output end of the liquid storage is connected to the filter The input end of the filter is connected, the output end of the filter is respectively connected with the input end of the first electronic expansion valve and the input end of the second electronic expansion valve, the outlet of the first electronic expansion valve is connected with the input end of the first evaporator, and the first evaporator The output end of the electronic expansion valve is connected to the first input end of the compressor, the outlet of the second electronic expansion valve is connected to the input end of the second evaporator, and the output end of the second evaporator is connected to the second input end of the compressor. The chilled water output end of the first evaporator is connected to the input end of the first water pump, the output end of the first water pump is connected to the input end of the floor radiation coil, and the outlet of the floor radiation coil is connected to the chilled water input end of the first evaporator. The chilled water outlet of the second evaporator is connected to the input end of the second water pump, the output end of the second water pump is connected to the input end of the auxiliary fan coil unit, and the outlet of the auxiliary fan coil unit is connected to the input end of the second evaporator.

The air treatment method of the air-conditioning device for heat and humidity separation treatment of multiple chilled water temperatures of the utility model is that the compressor of the chiller has double suction pressure, and the chiller has two evaporators, which respectively produce chilled water at different temperatures, and the first evaporation The high-temperature chilled water (12-14°C) produced by the second evaporator is supplied to the floor radiant coil to bear the main heat load in the room; the low-temperature chilled water (around 7°C) produced by the second evaporator is supplied to the auxiliary fan coil for use To bear the indoor humidity load and a small part of the heat load. When some indoor air passes through the auxiliary fan coil unit, because the temperature of the chilled water in the fan coil unit is lower than the dew point temperature of the air, the moisture in the air condenses in the fan coil unit, and the air comes out of the auxiliary fan coil unit as drier air. After mixing with the indoor air, it enters the auxiliary fan coil circulation again, thereby eliminating the indoor humidity load, making the dew point temperature of the indoor air lower than the floor surface temperature, and ensuring that the floor does not appear "condensation" during the floor radiant cooling process. The indoor air conducts convection and radiation heat exchange with the floor where the radiant coil is buried at the same time, and the cold energy is transmitted from the floor to the air and indoor equipment and personnel. Independent treatment of heat and humidity. The floor radiant coil does not undertake the dehumidification function, and can use higher temperature chilled water, thereby increasing the evaporation temperature of the refrigeration system, greatly improving the performance of the unit, and realizing energy saving.

The scheme adopted by the air-conditioning unit for the separation of heat and humidity at multiple chilled water temperatures is: the refrigerant is compressed and discharged in the compressor and enters the condenser to condense, and after condensing into a liquid, it enters the liquid storage, and then passes through the filter, and from the filter After coming out, the refrigerant is divided into two paths, one path is throttled and depressurized by the first electronic expansion valve, and then the refrigerant turns into a gas-liquid two-phase and enters the first evaporator, where the refrigerant exchanges heat with chilled water, absorbs heat and evaporates. Prepare high-temperature frozen water. After the refrigerant is completely evaporated, it becomes a superheated gas and enters the compressor from the first suction end of the compressor, and is compressed and discharged again, thereby realizing a cycle. Another path of refrigerant passes through the second electronic expansion valve, is throttled and reduced in pressure, and then enters the second evaporator, where the refrigerant exchanges heat with chilled water, absorbs heat and evaporates to produce low-temperature chilled water. After the refrigerant is completely evaporated, it becomes superheated gas, enters the compressor from the second suction end of the compressor, is recompressed by the compressor, and then discharged, thus realizing a cycle. In the high-temperature chilled water circuit, the chilled water exchanges heat with the refrigerant in the first evaporator, and the temperature drops. After coming out of the first evaporator, it is sucked and pressurized by the first water pump and then enters the floor radiant coil. Conduction, convection and radiation heat exchange, the temperature of the chilled water rises, and after coming out of the floor radiation coil, it enters the first evaporator again to exchange heat with the refrigerant to reduce its own temperature. Thus forming a cycle. In the low-temperature chilled water circuit, the chilled water exchanges heat with the refrigerant in the second evaporator, and the temperature drops. After coming out of the second evaporator, it is sucked by the second water pump and pressurized, and then enters the auxiliary fan coil, where the chilled water is exchanged with the air. Heat exchange, the water vapor in the air condenses, the temperature of the chilled water rises, and after coming out of the auxiliary fan coil, it enters the first evaporator to exchange heat with the refrigerant again, releasing heat to lower its own temperature, thus forming a cycle.

The key for the whole device to realize floor radiant cooling without dew condensation on the floor is to adjust the indoor air humidity by controlling the chilled water flow and wind speed in the auxiliary fan coil unit, so as to ensure that the dew point temperature of the indoor air is lower than the floor surface temperature , to prevent the occurrence of "condensation" on the floor. By controlling the frequency of the second water pump, that is, the speed, the chilled water flow of the auxiliary fan coil can be adjusted, and the wind speed can be controlled by changing the operating gears (high, medium and low) of the fans in the auxiliary fan coil.

Beneficial effects: The advantage of the heat-humidity separation treatment air-conditioning device with multiple chilled water temperatures is that it can simply and effectively eliminate the condensation problem of floor radiant cooling, and make up for the shortcoming of the floor radiant cooling in the initial cooling transition time. . The whole device has simple structure, high control precision and less initial investment. At the same time, because high-temperature chilled water is used to bear the indoor sensible heat load, the performance of the unit is greatly improved, realizing the high efficiency and energy saving of the entire unit system, and having good economy.

Description of drawings

Fig. 1 is a schematic flow chart of the utility model heat-moisture separation treatment air-conditioning device with multiple chilled water temperatures.

In the above figure, there are: compressor 1; compressor first input end 1a; compressor second input end 1b; condenser 2; liquid receiver 3; filter 4; first electronic expansion valve 5; first evaporator 6 ; The second electronic expansion valve 7; The second evaporator 8; The first water pump 9; The floor radiant cooling coil 10; The second water pump 11;

Detailed ways

Further illustrate the specific embodiment of the present utility model in conjunction with accompanying drawing 1: compressor 1 outlet connects the input end of condenser 2, the output end of condenser 2 connects the input end of accumulator 3, the output end of accumulator 3 and filter The input end of the filter 4 is connected, the output end of the filter 4 is connected with the input end of the first electronic expansion valve 5 and the input end of the second electronic expansion valve 7 respectively, and the output end of the first electronic expansion valve 5 is connected with the first evaporator 6, the output of the first evaporator 6 is connected to the first input 1a of the compressor 1, the output of the second electronic expansion valve 7 is connected to the input of the second evaporator 8, and the output of the second evaporator 8 The second input terminal 1b of the compressor 1 is terminated. The chilled water output end of the first evaporator 6 is connected to the input end of the first water pump 9, the output end of the first water pump 9 is connected to the input end of the floor radiation coil 10, and the output end of the floor radiation coil 10 is connected to the first evaporator 6 chilled water input. The chilled water output end of the second evaporator 8 is connected to the input end of the second water pump 11, the output end of the second water pump 11 is connected to the input end of the auxiliary fan coil unit 12, and the output end of the auxiliary fan coil unit 12 is connected to the second evaporator 8 input terminal. Wherein, compressor 1 is a double-suction pressure compressor, such as a multi-cylinder piston compressor, or a screw compressor with intermediate suction, or a digital scroll compressor.

Separate treatment of heat and moisture at multiple chilled water temperatures The treatment process of the air-conditioning unit is as follows: part of the indoor air is first sucked by the auxiliary fan coil unit, because the temperature of the chilled water in the fan coil unit is lower than the dew point temperature of the air, and the water vapor in the air flows through the fins of the fan coil unit. Condensation on the sheet reduces the humidity of the air. After the air comes out of the auxiliary fan coil unit and mixes with the indoor air, it enters the auxiliary fan coil unit again to circulate, thereby eliminating the indoor humidity load and making the dew point temperature of the indoor air lower than the floor surface temperature, ensuring There is no "condensation" phenomenon in the process of floor radiant cooling. The indoor air conducts convection and radiation heat exchange with the floor where the radiant coil is buried at the same time. The cold energy is transferred from the floor to the air, indoor equipment and personnel, and the floor radiant coil bears the sensible heat load in the room. Realize the independent treatment of heat and humidity of indoor air conditioning load, and at the same time, the floor radiation does not undertake the dehumidification function, and higher temperature chilled water can be used, thereby increasing the evaporation temperature of the refrigeration system, greatly improving the performance of the unit, and realizing energy saving.

The specific process of separate treatment of heat and humidity at multiple chilled water temperatures is as follows: the refrigerant is compressed and discharged in the compressor, enters the condenser to condense, condenses into a liquid, enters the liquid receiver, and then passes through the filter to come out of the filter Afterwards, the refrigerant is divided into two paths. One path passes through the first electronic expansion valve to throttle and reduce pressure. After the refrigerant turns into a gas-liquid two-phase, it enters the first evaporator, where the refrigerant exchanges heat with chilled water, absorbs heat, and evaporates to produce Take high-temperature chilled water, and after the refrigerant is completely evaporated, it becomes a superheated gas that enters the compressor from the first suction end of the compressor, and is compressed and discharged again, thus realizing a cycle. The other refrigerant passes through the second electronic expansion valve, is throttled and depressurized, and then enters the second evaporator, where the refrigerant exchanges heat with the chilled water, absorbs heat and evaporates to produce low-temperature chilled water, and becomes The superheated gas enters the compressor from the second suction end of the compressor, is recompressed by the compressor, and then discharged, thereby realizing a cycle. In the high-temperature chilled water circuit, the chilled water exchanges heat with the refrigerant in the first evaporator, and the temperature drops. After coming out of the first evaporator, it is sucked by the first water pump and pressurized, and then enters the floor radiant coil. The chilled water, floor, air Conduction, convection and radiation heat exchange, the temperature of the chilled water rises, and after coming out of the floor radiation coil, it enters the first evaporator again to exchange heat with the refrigerant to reduce its own temperature. Thus forming a cycle. In the low-temperature chilled water circuit, the chilled water exchanges heat with the refrigerant in the second evaporator, and the temperature drops. After coming out of the second evaporator, it is sucked by the second water pump and pressurized, and then enters the auxiliary fan coil, where the chilled water is exchanged with the air. Heat exchange, the temperature of chilled water rises, and after coming out of the auxiliary fan coil, it enters the first evaporator to exchange heat with the refrigerant again, releasing heat to lower its own temperature, thus forming a cycle.

In the early stage of floor radiant cooling start-up, by increasing the auxiliary fan coil wind speed and chilled water volume, the indoor air temperature can quickly reach the target value, making up for the lack of too long pre-cooling time for floor radiant cooling start-up.

When the indoor humidity load changes, the amount of chilled water and wind speed entering the auxiliary fan coil is controlled by adjusting the second water pump and the number of fan operating gears. When the humidity load is large, the amount of chilled water and wind speed entering the auxiliary fan coil is increased. When the humidity load is small, reduce the chilled water volume and wind speed entering the auxiliary fan coil unit.

Claims (5)

1. the heat of chilled water temperature more than one kind wets and separately handles aircondition, it is characterized in that compressor (1) outlet connects the input of condenser (2), the input of the output termination reservoir (3) of condenser (2), the output of reservoir (3) links to each other with the input of filter (4), the output of filter (4) connects the input of first electric expansion valve (5) and the input of second electric expansion valve (7) respectively, the output of first electric expansion valve (5) connects the input of first evaporimeter (6), the first input end (1a) of the output termination compressor (1) of first evaporimeter (6), the input of output termination second evaporimeter (8) of second electric expansion valve (7), second input (1b) of the output termination compressor (1) of second evaporimeter (8); The input of chilled water output termination first water pump (9) of first evaporimeter (6), the output of first water pump (9) connects the input of flooring radiation coil pipe (10), the chilled water input of output termination first evaporimeter (6) of flooring radiation coil pipe (10); The input of chilled water output termination second water pump (11) of second evaporimeter (8), the input of the output termination accessory fan coil pipe (12) of second water pump (11), the input of output termination second evaporimeter (8) of accessory fan coil pipe (12).

2. the heat of many chilled water temperatures according to claim 1 is wet separately handles aircondition, it is characterized in that compressor (1) is a double suction atmospheric pressure compressor.

3. the heat of many chilled water temperatures according to claim 2 is wet separately handles aircondition, it is characterized in that described double suction atmospheric pressure compressor is the multi-cylinder piston compressor, or the middle air-breathing helical-lobe compressor of band, or digital scroll compressor.

4. the heat of many chilled water temperatures according to claim 1 is wet separately handles aircondition, it is characterized in that accessory fan coil pipe (12) bears the room air humidity load, and the blower fan wind speed is adjustable in the accessory fan coil pipe (12).

5. the heat of many chilled water temperatures according to claim 1 is wet separately handles aircondition, it is characterized in that first water pump (9), second water pump (11) are variable frequency pump or adjustable speed water pump.