CN107305044B

CN107305044B - Energy-saving machine room air conditioning system and operation method thereof

Info

Publication number: CN107305044B
Application number: CN201610254995.3A
Authority: CN
Inventors: 王舜
Original assignee: Vertiv Tech Co Ltd
Current assignee: Vertiv Tech Co Ltd
Priority date: 2016-04-21
Filing date: 2016-04-21
Publication date: 2020-03-27
Anticipated expiration: 2036-04-21
Also published as: CN107305044A

Abstract

The invention relates to an energy-saving machine room air conditioning system and an operation method thereof. This energy-conserving computer lab air conditioning system includes a first circulation circuit that is used for refrigerated, and this first circulation circuit is including pump, liquid storage pot, condenser, compressor, evaporimeter and the expansion valve of series connection in proper order, a first check valve of both ends still parallelly connected of pump, a second check valve of compressor both ends still parallelly connected, this energy-conserving computer lab air conditioning system still include one be used for right the inlet air temperature of condenser carries out the second circulation circuit of precooling, and this second circulation circuit utilizes the nature cold source to cool down the inlet air temperature of condenser. Because the circulating system for precooling by using the natural cold source is added, the air inlet temperature of the condenser in the air conditioning system of the energy-saving machine room is reduced, the annual working time of a pump in the first circulating system for refrigeration in the air conditioner is prolonged, the refrigerating time by using the cold energy of the outdoor natural cold source is prolonged, and the annual energy efficiency ratio of the air conditioning system of the energy-saving machine room is improved.

Description

Energy-saving machine room air conditioning system and operation method thereof

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of air conditioners, in particular to an energy-saving machine room air conditioning system and an operation method thereof.

[ background of the invention ]

With the development of modern information technology, the number and scale of communication machine rooms are continuously enlarged, and meanwhile, under the call of national energy conservation and emission reduction policies, the reduction of energy consumption of the machine rooms becomes a key point of attention of many operators. According to investigation, the power consumption of the precise air conditioner in the machine room accounts for more than 50% of the total power consumption of the machine room, and the power consumption of the air conditioner can reach about 70% of the power consumption of the base station or the module station in a plurality of base stations and module stations. Therefore, effectively reducing the power consumption of the air conditioner is an important direction for reducing the energy consumption of the machine room.

The SDC air conditioning System (Smart Dual Cycle System, intelligent double circulation System) is a novel energy-saving air conditioner in a machine room, and the basic composition structure of the air conditioning System is that a set of pump System is added on the basis of the original refrigeration System. When the environment is low, a pump system in the air conditioning system operates, and the compressor is bypassed and stops operating, at the moment, the air conditioning system obtains the cold energy of an outdoor natural cold source through the pump system, so that the indoor refrigeration requirement is met; when the ambient temperature is high, the pump system cannot meet the refrigeration requirement, the pump system is bypassed and stops running, and the compressor system independently runs to provide refrigeration capacity.

The system is influenced and limited by the dry bulb temperature of the local environment, the annual running time of the pump system is short, and the annual energy efficiency ratio of the system is not improved.

[ summary of the invention ]

The invention aims to solve the technical problem of an energy-saving machine room air conditioning system with a more optimized annual energy efficiency ratio and an operation method thereof.

In order to solve the technical problem, the invention provides the following technical scheme:

the utility model provides an energy-conserving computer lab air conditioning system, this energy-conserving computer lab air conditioning system includes a first circulation circuit that is used for refrigerated, this first circulation circuit is including pump (1) of series connection in proper order, liquid storage pot (3), condenser (4), compressor (5), evaporimeter (6) and expansion valve (12), a first check valve (21) of still parallelly connected at the both ends of this pump (1), a second check valve (22) of still parallelly connected in this compressor both ends, a serial communication port, this energy-conserving computer lab air conditioning system still includes a second circulation circuit that is used for carrying out the precooling to the inlet air temperature of this condenser (4), this second circulation circuit utilizes the nature cold source to cool down the inlet air temperature of this condenser (4).

In some embodiments, the second circulation loop comprises: the water pipe coil (42) of the condenser (4), the water storage tank (7) and the water pump (11) are sequentially connected in series, the water storage tank (7) is used for storing a transfer medium for precooling, and the water pump (11) is used for pumping water out of the water storage tank (7) and returning the pumped water to the water storage tank (7) after passing through the water pipe coil (42).

In some embodiments, the reservoir (7) is an insulated reservoir or a reservoir buried in soil or immersed in water to ensure that the temperature of the transfer medium inside is below ambient temperature.

In some embodiments, the second circulation loop further comprises: the underground pipe or the cooling tower is connected with the water coil pipe (42), the water storage tank (7) and the water pump (11) in series, and after the water pump (11) pumps water out of the water storage tank (7), the underground pipe or the cooling tower returns to the water storage tank (7) through the water coil pipe (42).

In some embodiments, the second circulation loop further comprises an electric valve (9), the electric valve (9) is connected in parallel to two ends of the water coil (42), when the electric valve (9) is turned on, the water coil (42) is bypassed, and the water pump (11) pumps water out of the water storage tank (7), passes through the buried pipe or the cooling tower, and returns to the water storage tank (7).

An operation method of an energy-saving machine room air conditioning system comprises the following steps: detecting the ambient temperature; and when the ambient temperature is higher than the condensation temperature of the transmission medium in the second circulation loop of the energy-saving machine room air conditioning system for precooling, starting a water pump in the second circulation loop.

In some embodiments, the method further comprises: if the environment temperature is lower than the threshold temperature of starting the water coil pipe, opening the electric valve and bypassing the water coil pipe; if the environment temperature is higher than or equal to the threshold temperature of the starting water coil, the electric valve is disconnected, so that the transfer medium pumped out of the water storage tank by the water pump flows into the cooling tower after passing through the water coil, and finally returns to the water storage tank.

In some embodiments, the method further comprises: and detecting the temperature difference between the environment temperature and the water inlet temperature of the water coil, or the temperature difference between the environment temperature and the water inlet temperature of the water storage tank to adjust the flow of the transfer medium in the second circulation loop.

In some embodiments, when the water pump is an inverter pump, the step of detecting a temperature difference between the ambient temperature and a water inlet temperature of the water coil or a water inlet temperature of the water storage tank to adjust the flow rate of the transfer medium in the second circulation loop includes: detecting the temperature difference between the environment temperature and the water inlet temperature of the water coil or the water inlet temperature of the water storage tank; if the temperature difference is larger than the preset temperature difference preset by the energy-saving machine room air conditioning system, the flow of the transfer medium is increased until the flow is maximum; and if the temperature difference is less than or equal to the preset temperature difference of the energy-saving machine room air conditioning system, reducing the flow of a water system until the water pump is closed.

In some embodiments, when the water pump is a fixed frequency pump, the step of detecting a temperature difference between the ambient temperature and the inlet water temperature of the water coil or the inlet water temperature of the water storage tank to adjust the flow rate of the transfer medium in the second circulation loop includes: detecting the temperature difference between the environment temperature and the water inlet temperature of the water coil or the water inlet temperature of the water storage tank; and when the temperature difference is smaller than the preset temperature difference in the control system of the energy-saving machine room air conditioning system, closing the water pump.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of an energy-saving machine room air conditioning system provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of an air conditioning system of an energy-saving machine room according to embodiment 2 of the present invention;

fig. 3 is a schematic structural diagram of an energy-saving machine room air conditioning system provided in embodiment 3 of the present invention;

fig. 4 is a flowchart of an operation method of an air conditioning system of an energy-saving machine room according to embodiment 4 of the present invention;

fig. 5 is a flowchart of an operation method of an energy-saving machine room air conditioning system according to embodiment 4 of the present invention when a variable frequency water pump is used;

fig. 6 is a flowchart of an operation method when the energy-saving machine room air conditioning system adopts the fixed-frequency water pump according to embodiment 4 of the present invention.

Reference numerals:

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, embodiment 1 of the present invention provides an energy-saving air conditioning system for a machine room. This energy-conserving computer lab air conditioning system includes: the system comprises a pump 1, a first one-way valve 21, a liquid storage tank 3, a condenser 4, a compressor 5, a second one-way valve 22, an evaporator 6, an expansion valve 12, a water storage tank 7 and a water pump 11. The condenser 4 comprises a fluorine coil 41 and a water coil 42, the fluorine coil 41 and the water coil 42 being two separate heat exchange coils.

Wherein, the pump 1, the liquid storage tank 3, the condenser 4 and the fluorine coil 41 thereof, the compressor 5, the evaporator 6 and the expansion valve 12 are connected in series in sequence to form a first circulation loop for refrigeration. Wherein, the two ends of the pump 1 are also connected with a first one-way valve 21 in parallel, and the compressor is connected with a second one-way valve 22 in parallel. In the first circulation loop, when the inlet air temperature of the fluorine coil 41 of the condenser 4 is higher than a certain threshold value, the first check valve 21 is switched on, and the second check valve 22 is switched off, the pump 1 is bypassed, and the energy-saving machine room air conditioning system is only refrigerated by the compressor to provide cold energy; when the inlet air temperature of the fluorine coil 41 of the condenser 4 is lower than a certain threshold value, the second check valve 22 is switched on, and the first check valve 21 is switched off, the compressor 5 is bypassed, and the energy-saving machine room air conditioning system only provides cooling capacity by the operation of the pump 1.

The water coil 42, the reservoir 7 and the pump 11 form a second circulation loop. In the second circulation loop, the water pump 11 pumps water from the reservoir 7 through the water coil 42 and back into the reservoir 7. The accumulator tank 7 may provide water at a temperature below ambient air temperature for cooling the air passing through the water coil 42. The water storage tank 7 can be an insulated water storage tank to ensure that the water temperature of water required in the water storage tank is lower than the ambient temperature; or buried in soil or soaked in water to ensure that the water temperature inside the water is lower than the ambient temperature. The liquid stored in the reservoir 7 may be water, glycol, or other liquid that provides a pre-cooling effect. Therefore, the second circulation system lowers the intake air temperature of the condenser 4 by the natural cooling source.

The flow direction of the air at the inlet of the condenser 4 is: passes through the water coil 42 and then the fluorine coil 41 to the condenser 4. The water in the water coil 42 is the water which is extracted from the water storage tank and is lower than the ambient temperature, and the water can pre-cool the air passing through the water coil 42, so that the inlet air temperature of the condenser 4 is reduced. When the pre-cooled air is cooled by the fluorine coil 41, the energy consumption required for cooling can be reduced. Meanwhile, due to the precooling treatment of the inlet air in the condenser 4 by the second circulation system, the annual working time of the pump 1 is prolonged by reducing the inlet air temperature of the fluorine coil 41 of the condenser 4. The pump 1 meets the indoor refrigeration requirement by acquiring the cold energy of an outdoor natural cold source, and the energy consumption of the pump is lower than that of the compressor 5. That is, for the energy-saving machine room air conditioning system, the longer the pump 1 operates all the year round, the higher the energy efficiency ratio of the energy-saving machine room air conditioning system.

Example 2

As shown in fig. 2, compared with embodiment 1, an energy-saving air conditioning system in a machine room provided in embodiment 2 of the present invention is different in that: in the second circulation circuit a ground pipe 8 is added. Namely, the water coil 42, the buried pipe 8, the water storage tank 7 and the water pump 11 are connected in series in sequence to form a second circulation loop.

When the water pump 1 operates, water in the water storage tank 7 is pumped out, air is pre-cooled through the water coil pipe 42, and then the air is cooled through the buried pipe 8 and returns to the water storage tank.

The buried pipe 8 can be a cooling tower 10, and can also be a water ring buried pipe for absorbing cold of well water or rivers and lakes.

Example 3

As shown in fig. 3, compared with embodiment 1, an energy-saving air conditioning system in a machine room provided in embodiment 3 of the present invention is different in that: an electric valve 9 and a cooling tower 10 are added in the second circulation loop. Wherein, the water coil 42, the cooling tower 10, the water storage tank 7 and the water pump 11 are connected in series in sequence to form a second circulation loop. The electro valve 9 is connected in parallel with the water coil 42.

When the environment temperature is lower than a set value in operation, the electric valve 9 is switched on, the water coil 42 is bypassed, and the water pumped by the water pump 11 from the water storage tank 7 directly enters the cooling tower 10 for cooling and then returns to the water storage tank 7 for standby.

Example 4

As shown in fig. 4, an operation method of an air conditioning system in an energy saving machine room according to embodiment 4 of the present invention includes:

step 110, detecting an ambient temperature Ta;

and step 120, when the ambient temperature Ta is higher than the condensation temperature Tfre of the transmission medium of the pre-cooled second circulation loop of the energy-saving machine room air conditioning system, starting a water pump in the second circulation loop.

Optimally, step 120 may further include: and when the temperature of the measured environment temperature Ta is lower than or equal to the condensation temperature Tfire of the transfer medium, the water pump is closed.

The transfer medium is the liquid stored in the water storage tank 7, when the ambient temperature is lower than or equal to the condensation temperature, the liquid is solidified, and the liquid cannot be pumped out of the water storage tank 7, so the water pump 1 can be started only when the ambient temperature Ta is higher than the condensation temperature Tfire; for example, the condensation temperature Tfre of water is 2 deg.c.

Preferably, the operation method of the air conditioning system of the energy-saving machine room provided in embodiment 4 may further include:

step 130, judging whether the environment temperature is higher than the threshold temperature Tset of the starting water coil 42 or not, and if the environment temperature is lower than the threshold temperature Tset, turning on the electric valve 9; above which the electric valve 9 is opened.

Setting the threshold temperature Tset of the water coil 42 too low may affect the EER (Energy Efficiency Ratio, i.e. the coefficient of performance of the air conditioner, also called the Energy Efficiency Ratio) of the Energy-saving machine room air conditioning system when the pump 1 is running, and may be set to 5 ℃.

When the electric valve 9 is switched on, the water coil 42 is bypassed, the transfer medium pumped out from the water storage tank 7 by the water pump 11 directly flows into the cooling tower 10 for cooling, and at the moment, only the transfer medium in the water storage tank 7 is cooled and stored; when the electric valve 9 is disconnected, the transfer medium pumped out of the water storage tank 7 by the water pump 11 passes through the water coil 42 to pre-cool the air at the inlet of the condenser 7, then flows into the cooling tower 10 to be cooled, and finally returns to the water storage tank 7; thereby extending the annual operating time of the pump and thereby improving the energy efficiency ratio.

in step 140, the temperature difference △ T between the ambient temperature Ta and the inlet water temperature Tin1 of the water coil 42 or the inlet water temperature Tin2 of the accumulator tank 7 is detected to adjust the flow rate of the transfer medium in the second circulation loop.

Specifically, the method comprises the following steps:

when Ta is larger than Tset, the transfer medium passes through the water coil 42, the flow is adjusted by controlling the difference △ T between the inlet water temperature Tin1 of the coil 2 and the ambient temperature Ta, and △ T is Ta-Tin 1;

when Ta is less than Tset, the flow is adjusted by controlling the difference value △ T between the ambient temperature Ta and the inlet water temperature Tin2 of the water storage tank, wherein △ T is equal to Tin2-Ta, and optimally, the ambient wet bulb temperature is adopted for Ta, and the ambient dry bulb temperature is adopted for Ta when the inlet water temperature of the buried pipe or the water ring buried pipe is adopted to measure the temperature difference △ T.

As shown in fig. 5, preferably, when the water pump 11 is a variable frequency pump, the step 140 specifically includes:

step 141, detecting the temperature difference △ T between the ambient temperature Ta and the inlet water temperature Tin1 of the water coil 42 or the inlet water temperature Tin2 of the water storage tank 7;

step 142, judging whether the temperature difference △ T is greater than a preset temperature difference DT preset in a control system of the energy-saving machine room air conditioning system, if so, executing step 143, otherwise, executing step 144;

step 143, increasing the flow of the transmission medium until the flow is maximum;

and 144, reducing the flow of the water system until the water pump 11 is closed.

As shown in fig. 6, preferably, when the water pump 11 is a fixed-frequency pump, the step 140 specifically includes:

step 145, detecting the temperature difference △ T between the ambient temperature Ta and the inlet water temperature Tin1 of the water coil 42 or the inlet water temperature Tin2 of the water storage tank 7;

and step 146, when the temperature difference △ T is smaller than a preset temperature difference DT preset in a control system of the energy-saving machine room air conditioning system, closing the water pump 11.

In the above embodiments 1 to 5, the compressor 5 may be a constant-capacity or variable-capacity compressor, the pump 1 may be a constant-frequency pump or a variable-frequency pump, the condenser 5 may be an air-cooled condenser or an evaporative condenser, the expansion valve 12 may be an electronic expansion valve, a thermostatic expansion valve or other intelligent flow regulating valve body, the electric valve 9 is a normally closed solenoid valve, the cooling tower 10 may be replaced by a buried pipe, or may be a water-circulating buried pipe for absorbing well water or water in rivers and lakes, or three or two of the three forms may be connected in parallel. The number of the compressor 5, the pump 1, the water pump 11 and the evaporator 6 may be one or more.

The embodiment of the invention provides an energy-saving machine room air conditioning system and an operation method thereof, which make full use of cold sources in outdoor environment by using a liquid medium cold accumulation mode, such as: the air source, the soil source or the water source reduce the air inlet temperature of the fluorine coil pipe of the condenser, thereby reducing the condensation temperature, improving the annual running time of the pump, improving the energy efficiency ratio of the system and achieving the purpose of energy conservation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The energy-saving machine room air conditioning system comprises a first circulation loop for refrigeration, wherein the first circulation loop comprises a pump (1), a liquid storage tank (3), a condenser (4), a compressor (5), an evaporator (6) and an expansion valve (12) which are sequentially connected in series, two ends of the pump (1) are also connected with a first one-way valve (21) in parallel, and two ends of the compressor are also connected with a second one-way valve (22) in parallel, and the energy-saving machine room air conditioning system is characterized by further comprising a second circulation loop for precooling the air inlet temperature of the condenser (4), and the second circulation loop utilizes a natural cold source to cool the air inlet temperature of the condenser (4);

the second circulation loop includes: the water coil pipe (42), the jar that impounds (7) and the water pump (11) of condenser (4) that series connection in proper order, the jar that impounds (7) are used for the storage to be used for the transmission medium of precooling, water pump (11) are used for following water is taken out in the jar that impounds (7), and the via behind water coil pipe (42) will the water of taking out returns to in the jar that impounds (7).

2. Energy-saving air conditioning system of a machine room as claimed in claim 1, wherein the water storage tank (7) is an insulated water storage tank or a water storage tank buried in soil or immersed in water to ensure that the temperature of the transfer medium inside is lower than the ambient temperature.

3. The energy-saving machine room air conditioning system of claim 1, wherein the second circulation loop further comprises: the underground pipe or the cooling tower is connected with the water coil (42), the water storage tank (7) and the water pump (11) in series, and after the water pump (11) pumps water out of the water storage tank (7), the water is pumped back to the water coil (42), the underground pipe or the cooling tower and finally returns to the water storage tank (7).

4. The air conditioning system of energy-saving machine room as claimed in claim 3, wherein the second circulation loop further comprises an electric valve (9), the electric valve (9) is connected in parallel with both ends of the water coil (42), when the electric valve (9) is turned on, the water coil (42) is bypassed, and the water pump (11) pumps water out of the water storage tank (7), and then the water returns to the water storage tank (7) after passing through the buried pipe or the cooling tower.

5. An operation method of an energy-saving machine room air conditioning system, which is applied to the energy-saving machine room air conditioning system according to any one of claims 1 to 4, and is characterized by comprising the following steps:

detecting the ambient temperature;

and when the ambient temperature is higher than the condensation temperature of the transmission medium in the second circulation loop of the energy-saving machine room air conditioning system for precooling, starting a water pump in the second circulation loop.

6. The method for operating an energy saving machine room air conditioning system of claim 5, wherein the method further comprises:

if the environment temperature is lower than the threshold temperature of starting the water coil pipe, an electric valve is conducted, and the water coil pipe is bypassed; and if the environment temperature is higher than or equal to the threshold temperature of the starting water coil, disconnecting the electric valve, enabling the water pump to pump the transfer medium pumped out of the water storage tank to flow into the cooling tower after passing through the water coil, and finally returning to the water storage tank.

7. The method for operating an energy saving machine room air conditioning system of claim 5, wherein the method further comprises:

detecting the temperature difference between the environment temperature and the water inlet temperature of the water coil pipe, or adjusting the flow of the transfer medium in the second circulation loop by the temperature difference between the environment temperature and the water inlet temperature of the water storage tank.

8. The method according to claim 7, wherein when the water pump is an inverter pump, the detecting a temperature difference between the ambient temperature and a water inlet temperature of the water coil, or a temperature difference between the ambient temperature and a water inlet temperature of the water storage tank, to adjust the flow rate of the transfer medium in the second circulation loop, specifically comprises:

detecting the temperature difference between the environment temperature and the water inlet temperature of the water coil or the water inlet temperature of the water storage tank;

if the temperature difference is larger than the preset temperature difference preset by the energy-saving machine room air conditioning system, the flow of the transfer medium is increased until the flow is maximum; and if the temperature difference is less than or equal to the preset temperature difference of the energy-saving machine room air conditioning system, reducing the flow of a water system until the water pump is closed.

9. The method according to claim 7, wherein when the water pump is a fixed frequency pump, the detecting a temperature difference between the ambient temperature and a water inlet temperature of the water coil, or a temperature difference between the ambient temperature and a water inlet temperature of the water storage tank, is used to adjust the flow rate of the transfer medium in the second circulation loop, and specifically comprises:

and when the temperature difference is smaller than a preset temperature difference in a control system of the energy-saving machine room air conditioning system, closing the water pump.