CN100476311C - Temperature and humidity independent control air conditioning system - Google Patents

Abstract

This invention relates to moisture independent control and memory air conditioning technique combination and to one system, which combines independent control air conditioning with outer melt and earth source pump technique, wherein, the hanging radiation board adopts cool water for 18 to 20 degrees to satisfy low temperature wind and cooling temperature requirements with better ice memory displacement peak to fill trough and with low cost and good air conditioning quality.

Description

Temperature and humidity independent control air conditioning system

technical field

The invention relates to the field of combining temperature and humidity independent control with energy storage air conditioning technology, in particular to an air conditioning system with independent temperature and humidity control.

Background technique

The control of indoor temperature and humidity is the main task of the air-conditioning system. At present, the conventional air-conditioning system sends the treated air into the room and relies on the heat exchange with the indoor air to complete the temperature and humidity control. However, it is difficult to achieve the control target of temperature and humidity with a single-parameter air supply, which often leads to the failure of temperature and humidity to meet the requirements at the same time. Due to the different characteristics of temperature and humidity treatment, treating the two at the same time will often cause some unnecessary energy loss.

Contents of the invention

The object of the present invention is to provide an air-conditioning system with independent temperature and humidity control according to the shortcomings of the above-mentioned prior art. On the premise of quality, energy saving and environmental protection are realized.

The object of the present invention is realized by the following technical solutions:

An air-conditioning system with independent control of temperature and humidity, characterized in that the system is composed of a temperature adjustment system and a humidity adjustment system, and the two are two independent adjustment output systems, the humidity adjustment system adopts an independent fresh air system, and the fresh air unit adopts Large temperature difference air supply mode, the cooling coil of the fresh air unit is used for freezing and dehumidification, and the cold source is provided by the ice storage system. The temperature adjustment system adopts radiation cooling mode, and a radiant panel is installed at the end of the system. The temperature adjustment system includes Electric refrigeration unit, ice storage device, ceiling radiant panel, ice water pump, plate heat exchanger I, plate heat exchanger II, glycol pump, chilled water pump I, chilled water pump II, and the outlet end of the evaporator of the electric refrigeration unit It is divided into two circuits, one is connected to the ice storage device, the other is connected to the plate heat exchanger I, and then the two are connected to the evaporator of the electric refrigeration unit through the ethylene glycol pump, and the ice storage device is connected to the plate heat exchanger II through the ice water pump. The heat exchanger I is connected to the ceiling radiant plate, and the return water from the suspended ceiling radiant plate is sent to the plate heat exchanger I through the chilled water pump I for heat exchange.

An air-conditioning system with independent control of temperature and humidity, characterized in that the system is composed of a temperature adjustment system and a humidity adjustment system, and the two are two independent adjustment output systems, the humidity adjustment system adopts an independent fresh air system, and the fresh air unit adopts Large temperature difference air supply mode, the cooling coil of the fresh air unit is used for freezing and dehumidification, and the cold source is provided by the ice storage system. The temperature adjustment system adopts radiation cooling mode, and a radiant panel is installed at the end of the system. The temperature adjustment system includes Ground source heat pump unit, buried coil, ice storage device, ceiling radiation plate, ice water pump, plate heat exchanger I, plate heat exchanger II, ethylene glycol pump, in which the refrigerant circuit of the system is: ground source The outlet end of the evaporator of the heat pump unit is divided into two routes, one is connected to the ice storage device, the other is connected to the plate heat exchanger I, and then the two are connected back to the evaporator of the ground source heat pump unit through the ethylene glycol pump, and the ice storage device is passed through The ice water pump is connected to the plate heat exchanger II, the buried coil is respectively connected to the plate heat exchanger I and the condenser of the ground source heat pump unit, and the ceiling radiation plate is connected to the plate heat exchanger I and the condenser of the ground source heat pump unit respectively catch.

The plate heat exchanger II is connected to the fresh air unit, and the fresh air unit is connected to the condenser of the ground source heat pump unit.

The plate heat exchanger II is connected to the fresh air unit, and the fresh air unit passes through the chilled water pump II to the plate heat exchanger II for heat exchange.

The advantage of the present invention is that it combines the air-conditioning mode with independent control of temperature and humidity with external ice melting and ground source heat pump technology, and the ceiling radiant plate uses cold water at 18-20°C, which improves the evaporation temperature of the refrigeration unit and the performance coefficient of the refrigeration unit The COP is significantly improved, and in transitional seasons, groundwater, surface water or cooling water from cooling towers can be considered as a cold source, which is energy-saving and environmentally friendly. Melting ice outside the ice storage device provides 3-5°C low-temperature water to supply fresh air units, which can meet the requirements of low-temperature air supply for chilled water temperature and meet the requirements of air-conditioning off-peak operation, and make better use of ice storage to shift peaks and fill valleys, saving operation Cost and improve the quality of air conditioning and other advantages.

Description of drawings

Fig. 1 is a schematic diagram of the system principle of Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the system principle of the second embodiment of the present invention;

Detailed ways

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1-2, the labels 1-20 respectively represent: air-conditioning water constant pressure device 1, fresh air unit 2, air-conditioning water constant pressure device 3, ceiling radiation plate 4, cooling water constant pressure device 5, hot and cold water pump I 6 , hot and cold water pump II 7, cooling water pump 8, buried coil 9, plate heat exchanger I 10, plate heat exchanger II 11, ice water pump 12, ice storage device 13, glycol constant pressure device 14, ethylene glycol Alcohol pump 15, ground source heat pump unit 16, dual working condition refrigeration unit 17, cooling tower 18, chilled water pump I 19, chilled water pump II 20. Label: two-way electric switch valve V1, V2, two-way electric control valve V3, V4, manual valve F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, temperature sensor: T1 , T2, T3, T4, T5, T6, flow sensor Fi.

Embodiment one:

The cold source adopts ground (water) source heat pump + ice storage and external ice melting method, and the end of the air conditioner adopts ceiling radiant panels + independent fresh air system, and the fresh air system adopts the air supply method with large temperature difference.

The temperature and humidity independent control air-conditioning system of the present embodiment comprises ceiling radiant panels 4, air-conditioning water constant pressure device 3, cold and hot water pump 16, plate heat exchanger 110, fresh air unit 2, air-conditioning water constant pressure device 1, heating and cooling Water pump II 7, ethylene glycol constant pressure device 14, ethylene glycol pump 15, ground source heat pump unit 16, ice storage device 13, ice water pump 12, plate heat exchanger II 11, buried coil 9, cooling water pump 8, Cooling water constant pressure device 5.

Among them, the refrigerant circuit: the outlet end of the evaporator of the ground source heat pump unit 16 is divided into two circuits, one is connected to the ice storage device 13 through the electric switch valve V1, and the other is connected to the plate heat exchanger I 10 through the electric switch valve V2, and then merged From the ethylene glycol pump 15 back to the evaporator of the ground source heat pump unit 16, the ice storage device 13 passes through the electric regulating valve V3 all the way, enters the plate heat exchanger II 11 through the ice water pump 12, bypasses all the way through the electric regulating valve V4, and merges Back to the ice storage device 13.

Air-conditioning water circuit: the buried coil 9 is connected to the plate heat exchanger I10 through the manual valves F2, F6, and the condenser of the ground source heat pump unit 16 through the manual valves F1, F5, and the ceiling radiant plate 4 is connected to the manual valves F3, F3, F7 is connected to the plate heat exchanger I10, connected to the condenser of the ground source heat pump unit 16 through F4 and F8, and the fresh air unit 2 is connected to the plate heat exchanger II 11 through the manual valves F9 and F10, and connected to the plate heat exchanger II 11 through the manual valves F11 and F12 It is connected with the ground source heat pump unit 16 condenser.

When this embodiment is applied: the ground source heat pump unit 16 operates in the cooling condition during the day in summer, and operates in the ice-making condition at night; it operates in the heating condition in winter.

Cooling in summer: open manual valves F1, F3, F5, F7, F9, F11, close manual valves F2, F4, F6, F8, F10, F12.

The system operates in the following modes:

1. During the low-valley electricity period at night, the system runs in the ice-making mode. In the refrigerant circuit, the ground source heat pump unit 16 and the glycol pump 15 run, the electric on-off valve V1 is opened, the electric on-off valve V2, the electric regulating valve V3 and the electric on-off valve are connected. The regulating valve V4 is closed; the air-conditioning water circuit stops working, that is, the cold and hot water pump I 6 and the cold and hot water pump II 7 stop running.

In the brine circuit, the ethylene glycol solution enters the ground source heat pump unit 16 through the ethylene glycol pump 15 to be refrigerated, and then enters the ice storage device 13 through the electric switch valve V1, and transfers the cooling capacity to the water in the ice storage device 13 It is frozen outside the coil pipe, and the ethylene glycol solution after the temperature rise returns to the ethylene glycol pump 15 to enter the next cycle.

2. During the day, the ice storage device melts the ice to provide low-temperature cold water for use by the fresh air unit, and the ground source heat pump unit 16 produces relatively high-temperature cold water for use by the ceiling radiant panels 4 .

In the refrigerant circuit, the ground source heat pump unit 16 and the ethylene glycol pump 15 are running, the electric on-off valve V1 is closed, the electric on-off valve V2 is opened, and the temperature of the ethylene glycol solution coming out of the condenser of the ground source heat pump unit 16 is low. Through the plate heat exchanger 110 and the ceiling radiant plate 4 return water for heat exchange, the ethylene glycol solution after the temperature rise returns to the ground source heat pump unit 13 condenser through the ethylene glycol pump 15, and enters the next cycle.

In the chilled water circuit of the fresh air unit 2, the cold and hot water pump II 7 is running, and the air-conditioning return water from the fresh air unit 2 enters the plate heat exchanger II 11, exchanges heat with the ice storage device 13 ice water circuit, and sends it to the fresh air unit 2 after the temperature drops , enter the next cycle. The cold water with higher temperature after the backwater heat exchange with the fresh air unit 2 transfers heat to the ice in the ice storage device 13 to melt the ice, and the cold water after cooling enters the plate heat exchanger 110 through the ice water pump 12, and is connected with the fresh air unit 2 Return water for heat exchange and enter the next cycle. Electric control valves V3 and V4 are adjusted to meet the requirements of load changes.

During heating in winter: open manual valves F2, F4, F6, F8, F10, F12, close manual valves F1, F3, F5, F7, F9, F11.

The ground source heat pump unit 16 is running under the heating condition, the electric on-off valve V1, the electric regulating valve V3, and the electric regulating valve V4 are closed, the electric on-off valve V2 is opened, and the ethylene glycol solution passes through the plate heat exchanger I 10 and the buried coil 9 The cooling water performs heat exchange, and the ethylene glycol solution after the temperature rises returns to the condenser of the ground source heat pump unit 16 through the ethylene glycol pump 15, and enters the next cycle.

The air-conditioning return water from the ceiling radiant plate 4 passes through the cold and hot water pump 6, and passes through the manual valve F4; the air-conditioning return water from the fresh air unit 2 passes through the cold and hot water pump I 6, and passes through the manual valve F10, and the two channels merge into the ground source heat pump unit 16 The condenser, after the temperature rises, is divided into two ways for heating, one way enters the ceiling radiant panel 4 through the manual valve F8, and the other way enters the fresh air unit 2 through the manual valve F12.

In order to clearly illustrate the operating status of each valve in the system, as shown in Table 1 and Table 2.

Table 1 Seasonal switching valve control table of ground source heat pump unit (as shown in Figure 1)

Table 2 Control table of refrigerant circuit valves (as shown in Figure 1)

Embodiment two:

The cold source adopts electric refrigeration unit + ice storage and external ice melting method, and the end of the air conditioner adopts ceiling radiant panels + independent fresh air system, and the fresh air system adopts the air supply method with large temperature difference.

The temperature and humidity independent control air-conditioning system of this embodiment includes ceiling radiant panels 10, air-conditioning water constant pressure device 3, chilled water pump I 19, plate heat exchanger I 10, fresh air unit 2, air-conditioning water constant pressure device 1, and chilled water pump II 20. Ethylene glycol constant pressure device 14, ethylene glycol pump 15, electric refrigeration unit 17, ice storage device 13, ice water pump 12, plate heat exchanger II 11, cooling tower 18, cooling water pump 8.

The refrigerant circuit wherein: the outlet end of the evaporator of the refrigerator 17 is divided into two paths, one path is connected to the ice storage device 13 through the electric switching valve V1, and the other path is connected to the plate heat exchanger 110 through the electric regulating valve V2, and then after converging, the Glycol pump 15 returns to refrigerator 17 evaporator. One way of the ice storage device 13 passes through the electric control valve V3, enters the plate heat exchanger II11 through the ice water pump 12, and one way bypasses through the electric control valve V4, and returns to the ice storage device 13 after merging.

Air-conditioning water circuit: plate heat exchanger I10 is connected to the ceiling radiant plate 4, the return water of the ceiling radiant plate 4 is sent to the plate heat exchanger I10 through the chilled water pump I19 to exchange heat with the refrigerant circuit, and the chilled water after the temperature is lowered Send to the ceiling radiant plate 4 for cooling. The plate heat exchanger II 11 is connected to the fresh air unit 2, and the return water of the fresh air unit 2 is sent to the plate heat exchanger II 11 through the chilled water pump II 20 to exchange heat with the external ice-melting ice water circuit, and the low-temperature chilled water after the temperature drops is sent to the fresh air Unit 2 provides cooling.

When this embodiment is used, the system adopts the following operating modes:

1. During the low-valley electricity period at night, the system runs in the ice-making mode. In the refrigerant circuit, the refrigerator 17 and the glycol pump 15 run, the electric on-off valve V1 is opened, the electric on-off valve V2, the electric regulating valve V3 and the electric regulating valve are turned on. V4. Closed; the air conditioning water circuit stops working, that is, the chilled water pump I 19 and the chilled water pump II 20 stop running.

In the brine circuit, the ethylene glycol solution enters the refrigerator 17 through the ethylene glycol pump 15 to be refrigerated and then enters the ice storage device 13, and transfers the cold energy to the water in the ice storage device 13 to freeze outside the coil. Ice, the ethylene glycol solution after the temperature rise returns to the ethylene glycol pump 15 through the electric regulating valve V3, and enters the next cycle.

2. During the day, the ice storage device 13 melts the ice to provide low-temperature cold water for the fresh air unit 2, and the refrigerator 17 produces relatively high-temperature cold water for the ceiling radiant panel 4 to use.

In the refrigerant circuit, the refrigerator 17 and the ethylene glycol pump 15 are running, the electric switch valve V1 is closed, the electric switch valve V2 is opened, and the ethylene glycol solution exchanges heat with the return water of the ceiling radiant plate 4 through the plate heat exchanger 110 , the ethylene glycol solution after the temperature rise returns to the refrigerator 17 condenser through the ethylene glycol pump 15, and enters the next cycle.

In the chilled water circuit of the fresh air unit 2, the chilled water pump II 20 is running, and the air-conditioning return water from the fresh air unit 2 enters the plate heat exchanger II 11, exchanges heat with the ice storage device 13 ice water circuit, and sends it to the fresh air unit 2 after the temperature drops. Enter the next cycle. After exchanging heat with the return water of the fresh air unit 2, the chilled water with a higher temperature transfers heat to the ice in the ice storage device 13 to melt the ice. The water exchanges heat and enters the next cycle. Electric control valves V3 and V4 are adjusted to meet the requirements of load changes. In the chilled water circuit of the ceiling radiant plate 4, the chilled water pump I 19 is running, and the air-conditioning return water from the ceiling radiant plate 4 enters the plate heat exchanger I 10, exchanges heat with the refrigerant of the refrigerator, and sends it to the ceiling radiant plate after the temperature is lowered 4. Enter the next cycle.

In order to clearly illustrate the operating status of each valve of the system, as shown in Table 3.

Table 3 Valve control table (as shown in Figure 2)

In the above embodiments, the indoor temperature adjustment adopts the radiation cooling method, and the water supply temperature is about 18-20°C, which bears the heat transfer and solar heat load of the building envelope, that is, the gradual load and the radiant heat load of indoor equipment and personnel; humidity adjustment It is realized by an independent fresh air system. The fresh air system bears all the indoor humidity load and the convective heat load of personnel and equipment, that is, the instantaneous load, and at the same time meets the requirements of the fresh air volume of indoor personnel.

The ground source heat pump unit switches through the working conditions. In winter, it can use radiation heating. In the transition season, it can directly provide radiation cooling source through buried coil heat exchange. Water-cooled electric refrigeration unit can directly use cooling water to provide radiation cooling source.

Apparently, those skilled in the art can recognize that the use of the suspended ceiling radiant panels mentioned in the embodiments of the present invention can also be replaced by dry fan coil units or other equivalent devices.

The cold source adopts ground (water) source heat pump + ice storage and external ice melting method and electric refrigeration unit + external ice melting and ice storage method. Ground source heat pumps are combined with ice storage to exchange heat between heat pump equipment and shallow underground resources such as soil, groundwater, and surface water. In summer, low-peak electricity is used to make ice at night, for cooling during the day, and for heating and heat sources in winter. This system makes full use of high-grade and low-grade energy, maximizes the advantages of the two grades of energy, and greatly optimizes the energy structure. Two different air-conditioning systems make full use of their respective advantages. The ground source heat pump uses renewable energy—shallow underground resources, which not only improves the operating efficiency of the equipment, but also protects the environment; the external ice melting method can greatly Improving the ice-melting rate of the ice storage tank can better meet the requirements of low-temperature air supply and avoid peak operation of the refrigerator of the air-conditioning system. Thereby improving the quality of the air conditioner, saving the initial investment of the air conditioner system, and saving the operating cost of the ice storage air conditioner system.

The air-conditioning system is independently controlled by temperature and humidity, and the indoor residual humidity and CO ₂ are exhausted through the fresh air. The indoor residual heat is eliminated through the ceiling radiant panels. The losses caused by combined heat and humidity treatment in conventional air conditioning systems are eliminated. It can meet the changing requirements of the heat-humidity ratio in different rooms and avoid the phenomenon that the indoor humidity is too high or too low.

Ground source heat pump technology is a high-efficiency and energy-saving air-conditioning technology that uses underground shallow geothermal resources (also called ground energy, including groundwater, surface water or soil, etc.) to provide both heating and cooling. The ground source heat pump realizes the transfer of low-level energy to high-level energy by inputting a small amount of high-grade energy (such as electric energy). Due to the small ground temperature fluctuation throughout the year, warm in winter and cool in summer, its seasonal performance coefficient has the characteristics of a constant temperature heat source heat pump, and the seasonal average performance system is relatively high. The ground energy is used as the heat source of heat pump heating in winter and the cold source of air conditioning in summer, that is, in winter, the heat in the ground energy is taken out, and the temperature is raised to supply indoor heating; in summer, the heat in the room is taken out and released to the ground. Can go. Usually the ground source heat pump consumes 1KW of energy, and the user can get more than 4KW of heat or cold.

Ice-storage air-conditioning uses the cheap electricity in the low-load period of the power grid to cool through the refrigerator, and stores the cold energy in the form of latent heat in the ice. During the peak period of electricity consumption when the electricity price is expensive, the ice is melted to release the cold energy to meet the cooling load of the air conditioner. On the one hand, ice-storage air-conditioning can balance the load of the power grid, and on the other hand, it can save users the cost of air-conditioning operation, so it has good social and economic benefits.

With the rapid development of ice storage air conditioners, since melting ice can increase the lower outlet water temperature, large temperature difference and low temperature air supply air conditioning technology has also been widely used in recent years. The application of large temperature difference and low temperature air supply technology can reduce water pipes, The size of the air duct reduces the power of the water pump and fan, which can reduce the initial investment and operating costs of the air conditioning system, and at the same time improve the quality of the air conditioner. When applied to an independent fresh air system, it can not only greatly improve the processing capacity of the fresh air unit, but also reduce the cost of replacement. The thermal area can achieve better dehumidification effect, so that the system of independent control of temperature and humidity can be easily realized. The external ice-melting method can provide a lower outlet water temperature and a higher cooling rate than internal ice-melting, improving the overall efficiency of the system.

Claims (4)

1. An air-conditioning system with independent temperature and humidity control, characterized in that the system is composed of a temperature regulation system and a humidity regulation system, and the two are two independent regulation output systems, the humidity regulation system adopts an independent fresh air system, and the fresh air The unit adopts a large temperature difference air supply method, and the cooling coil of the fresh air unit is used for freezing and dehumidification. The cold source is provided by the ice storage system. The system includes electric refrigeration unit, ice storage device, ceiling radiant panel, ice water pump, plate heat exchanger I, plate heat exchanger II, glycol pump, chilled water pump I, chilled water pump II, among which the evaporator of the electric refrigeration unit The outlet end is divided into two routes, one is connected to the ice storage device, the other is connected to the plate heat exchanger I, and then the two are connected to the evaporator of the electric refrigeration unit through the glycol pump, and the ice storage device is connected to the plate heat exchanger II through the ice water pump , the plate heat exchanger I is connected with the ceiling radiant plate, and the return water from the suspended ceiling radiant plate is sent to the plate heat exchanger I through the chilled water pump I for heat exchange. 2. An air conditioning system with independent control of temperature and humidity, characterized in that the system is composed of a temperature adjustment system and a humidity adjustment system, and the two are two independent adjustment output systems. The humidity adjustment system adopts an independent fresh air system, and the fresh air The unit adopts a large temperature difference air supply method, and the cooling coil of the fresh air unit is used for freezing and dehumidification. The cold source is provided by the ice storage system. The system includes ground source heat pump units, buried coils, ice storage devices, ceiling radiant panels, ice water pumps, plate heat exchangers I, plate heat exchangers II, and ethylene glycol pumps. The refrigerant circuit of the system is: The outlet of the evaporator of the ground source heat pump unit is divided into two routes, one is connected to the ice storage device, and the other is connected to the plate heat exchanger I, and then the two are connected back to the evaporator of the ground source heat pump unit through the ethylene glycol pump to store ice The device is connected to the plate heat exchanger II through the ice water pump, and the buried coil is respectively connected to the plate heat exchanger I and the condenser of the ground source heat pump unit. device connected. 3. An air-conditioning system with independent temperature and humidity control according to claim 2, characterized in that said plate heat exchanger II is connected to a fresh air unit, and the fresh air unit is connected to the condenser of the ground source heat pump unit. 4. An air-conditioning system with independent temperature and humidity control according to claim 1, characterized in that the plate heat exchanger II is connected to a fresh air unit, and the fresh air unit exchanges heat with the plate heat exchanger II through the chilled water pump II.

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