CN115200106A - Waste heat recovery system and energy-saving constant-temperature and constant-humidity air conditioning unit - Google Patents
Waste heat recovery system and energy-saving constant-temperature and constant-humidity air conditioning unit Download PDFInfo
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- CN115200106A CN115200106A CN202210748369.5A CN202210748369A CN115200106A CN 115200106 A CN115200106 A CN 115200106A CN 202210748369 A CN202210748369 A CN 202210748369A CN 115200106 A CN115200106 A CN 115200106A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F2013/228—Treatment of condensate, e.g. sterilising
Abstract
The invention discloses a waste heat recovery system and an energy-saving constant-temperature and constant-humidity air conditioning unit, which relate to the technical field of air conditioners and comprise an energy-saving constant-temperature and constant-humidity air conditioning unit, an electrode type humidifier and an energy recovery system; the energy-saving constant-temperature constant-humidity air conditioning unit sequentially comprises an air conditioning unit box body, an air inlet, a primary filter, a fan motor, a secondary filter, a surface cooler, a heater, a humidifier spray pipe, an energy recovery heat exchanger, an air outlet and a temperature sensor T2; the energy recovery system comprises a circulating water pump, an energy recovery heat-preservation water tank, a water filter, a pipeline system, an electric two-way valve, an electric three-way valve and temperature sensors T1 and T2. The system can realize waste heat recovery under two different working conditions in winter and summer, and respectively recycles the drainage of the electrode humidifier and the condensed water of the air conditioning unit, thereby achieving the energy-saving effect.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a waste heat recovery system and an energy-saving constant-temperature constant-humidity air conditioning unit.
Background
More and more industrial products, pharmaceutical and food production workshops, laboratories and other environments have constant temperature and humidity requirements, and therefore constant temperature and humidity air conditioning equipment is required to achieve constant temperature and humidity. In order to realize and keep constant temperature and humidity, the air conditioning unit is provided with cooling, dehumidifying, heating and humidifying equipment. The constant temperature and humidity air conditioning unit dehumidifies in the summer working condition, and the constant temperature and humidity air conditioning unit heats and humidifies in the winter working condition. Therefore, the humidifier becomes the most common humidifier for the constant temperature and humidity air conditioning unit. The electrode humidifier continuously performs water replenishing and draining according to the conductivity of water in the humidification barrel in the operation process, wherein the drained water is high-temperature boiling water in the humidification barrel, the drained temperature is about 80 ℃, and the direct draining of the high-temperature water is energy waste. Because the drainage temperature is higher, the drainage pipeline of the electrode humidifier usually adopts high-temperature resistant galvanized or seamless steel pipes, which brings no increase of cost. In addition, when the constant temperature and humidity air conditioning unit cools and dehumidifies in summer, all the condensed water generated by the surface air cooler is normally and directly discharged. The condensed water temperature of the air conditioning unit is lower, generally between 14 and 15 ℃, and meets the requirement of medium-temperature chilled water for refrigeration of the air conditioning unit. Direct discharge is also an energy waste.
Disclosure of Invention
The invention provides a waste heat recovery system and an energy-saving constant-temperature and constant-humidity air conditioning unit, which aim to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
an energy-saving constant-temperature and constant-humidity air conditioning unit comprises an energy-saving constant-temperature and constant-humidity air conditioning unit, an electrode type humidifier and an energy recovery system;
the energy-saving constant-temperature and constant-humidity air conditioning unit sequentially comprises an air conditioning unit box body, an air inlet, a primary filter, a fan motor, a secondary filter, a surface cooler, a heater, a humidifier spray pipe, an energy recovery heat exchanger, an air outlet and a temperature sensor T2;
the energy recovery system comprises a circulating water pump, an energy recovery heat-preservation water tank, a water filter, a pipeline system, an electric two-way valve, an electric three-way valve and temperature sensors T1 and T2.
Preferably, the energy recovery heat-preservation water tank is an open water tank made of a steel plate, and heat-preservation cotton is wrapped outside the open water tank;
the water tank is internally provided with intermediate clapboards, so that the water tank is completely divided into a water supply side and a water return side to form a water supply and return circulating system, all the intermediate clapboards are provided with float valves, when the water supply in the water supply tank exceeds a limited amount, the float valves are opened, the water supply flows into the water return tank, and meanwhile, an electric three-way valve at the bottom of the water return tank is opened and is discharged by a drain pipe;
the descaling filtering device is arranged on the upper part of the water supply tank of the energy recovery heat-preservation water tank and is formed by attaching non-woven fabrics on a micro-penetration plate, so that scale in high-temperature drainage is filtered, and the energy recovery heat exchanger is prevented from being filthy and blocked.
Preferably, when the electrode humidifier operates, after the humidifying barrel drains water, the electric two-way valve is opened, the bypass valve of the electric three-way valve is closed, the circulating water pump is started to suck the drained water into the water supply tank of the energy heat preservation water tank, when a certain amount of water is collected in the water supply tank, the electric two-way valve and the circulating water pump are started (a control system is provided with time delay, namely the control system is started after the time delay of N minutes compared with the circulating water pump), high-temperature water flows into the energy recovery heat exchanger to carry out heat exchange, and meanwhile, the temperature T2 of wind and the temperature T1 of water behind the heat exchanger are detected;
the return water enters a return water tank, and an electric three-way valve at the bottom of the return water tank is controlled: when the electric two-way valve is opened, the adjusting proportion of the electric three-way valve is that the flow of the water supply pipe of the bypass valve is zero, the flow of the water discharge pipe is 100 percent, and the backwater is discharged completely; when the electric two-way valve is closed, the electric three-way valve adjusts the proportion that the flow of the bypass valve upper hose is 100%, the flow of the drain pipe is 0, the water return is all by-passed for circulating heat exchange, when the temperature of T2 is close to T1, the by-pass is closed, all the discharge is carried out, and the heat recovery is stopped.
Preferably, when the constant temperature and humidity air conditioning unit operates, surface cooling dehumidification generates condensed water, the electric two-way valve is closed, the flow of a bypass valve of the electric three-way valve is 100%, a drain pipe is closed, the circulating water pump is started to suck the condensed water into a water supply tank of the energy heat preservation water tank, when a certain amount of water is collected in the water supply tank, the electric two-way valve and the circulating water pump are started (a control system is provided with time delay, namely the control system is started after N minutes of time delay of the circulating water pump), and the condensed water flows into the energy recovery heat exchanger to carry out heat exchange; the backwater enters a backwater tank, the adjusting proportion of an electric three-way valve at the bottom of the backwater tank is that the flow of a water feeding pipe of a bypass valve is zero, the flow of a drain pipe is 100%, and the backwater is completely discharged.
Preferably, the waste heat recovery system is characterized in that a set of energy recovery device is arranged on the energy-saving constant-temperature and constant-humidity air conditioning unit, the energy recovery device recovers the heat of high-temperature water discharged by the electrode humidifier when the air conditioning unit operates in winter, and the high-temperature water is filtered and then sent into the constant-temperature and constant-humidity air conditioning unit for preheating and heating to recover the heat in the high-temperature water; when the air conditioning unit operates in summer, low-temperature condensate water generated by cooling and dehumidifying of the surface air cooler is recycled for pre-surface cooling in front of the surface air cooler, and cold energy in the low-temperature condensate water is recycled;
the system is operated in winter: when the electrode humidifier works, high-temperature water is continuously discharged, the high-temperature water (about 80 ℃) discharged from a water discharge pipe of the electrode humidifier is sucked into the energy recovery heat-preservation water tank through a water pipe by a circulating water pump, and because the water discharged by the electrode humidifier contains scale, a filtering device for removing the scale is required to be arranged in the energy recovery heat-preservation water tank, and the scale removing filtering device adopts a micro-perforated plate to attach non-woven fabrics, so that the scale filtering effect is effectively filtered; the energy recovery heat preservation water tank is divided into two parts, one part is a water supply tank which stores high-temperature water for the energy recovery heat exchanger of the air conditioning unit to provide the high-temperature water, and the other part is a water return tank which is formed by returning the medium-temperature water after the heat exchange of the energy recovery heat exchanger into the heat preservation tank and performs cyclic utilization or necessary discharge according to the heat recovery requirement of the air conditioning unit; high-temperature water on the side of a water supply tank in the heat-preservation water tank is supplied by a water supply pipe, the high-temperature water passes through the water supply pipe, a water filter performs secondary filtration, the high-temperature water at 80 ℃ is sent into an energy recoverer through the water supply pipe, the high-temperature water at 80 ℃ is subjected to heat exchange with low-temperature air (winter outdoor temperature), the high-temperature water at 80 ℃ is changed into medium-temperature water at 60 ℃ after heat exchange, the medium-temperature water enters the side of a water return tank in the heat-preservation water tank through a water return pipe, a water discharge pipe is arranged at the bottom of the water return side of the water tank, an electric three-way valve is arranged, when the electrode humidifier does not discharge water, the water return passes through the electric three-way valve, the water return is returned into the water supply pipe through a bypass pipe for circulating heat exchange, and when the water return temperature T1 detected by a temperature sensor on the water return pipe is close to the air outlet temperature T2 of the heat exchanger, the electric three-way valve is adjusted to enable the flow of the bypass pipe to be 0 (namely, the water discharge pipe is 100 percent, and the low-temperature water in the water return tank is discharged by the water discharge pipe, and the water circulation of the system is stopped; when the electrode humidifier is drained and the water supply tank in the energy recovery water tank can supply water, the energy recovery system recycles the heat recovery;
if the electrode humidifier continuously drains water, the drainage amount exceeds the heat exchange water amount required by the energy recovery coil pipe, namely when a water supply tank in the heat preservation water tank reaches the set height in the tank, the float valve is opened, the water of the water supply tank flows back to the water tank, and the water supply tank is prevented from overflowing; meanwhile, an electric three-way valve at the bottom of the water return tank is controlled to close the bypass water pipe and drain the water fully, namely the water return tank drains water when the ball float valve is opened;
the system is a water system operation flow, and the operation flow is analyzed from the air side of the air conditioning unit, namely the temperature of the fresh air is increased after the outdoor fresh air passes through the primary filter and the intermediate filter and is subjected to heat exchange with high-temperature drainage (80 ℃) in the outdoor low-temperature fresh air and the energy recovery coil pipe; the fresh air preheated by the energy recovery coil is heated by the main heating coil 6 and humidified by the humidifier 7 to reach a proper temperature and humidity, and then is sent to an air conditioner control area;
the system operates in summer: when the air conditioning unit cools and dehumidifies, the surface cooler usually adopts chilled water of 7-12 ℃ to cool and dehumidify, the temperature of condensed water generated by air is about 14-15 ℃, and low-temperature condensed water is sucked into the water supply side of the heat preservation water tank by the water discharge pipe of the air conditioning unit, the adjusting electric three-way valve and the water supply pump through the condensed water supply pipe; the low-temperature condensed water on the water supply side of the heat preservation water tank is supplied by a water supply pipe, the low-temperature condensed water passes through the water supply pipe of an electric two-way valve, a water filter performs secondary filtration, the low-temperature water at 14 ℃ is sent into energy recovery through the water supply pipe by a water pump, heat exchange is performed between the low-temperature water at 14 ℃ and high-temperature air (outdoor temperature in summer), the low-temperature water at 14 ℃ is changed into medium-temperature water at 19 ℃ after heat exchange, the medium-temperature water enters the water return side of the heat preservation water tank through a water return pipe, the flow of the bypass water pipe is 0 (namely the bypass water pipe is closed) through a drain pipe at the bottom of the water return side of the water tank through an electric three-way valve, the drain pipe drains water at 100%, and the medium-temperature condensed water on the water return side is drained by the drain pipe;
when the electric two-way valve is not used in summer or working conditions are switched in winter and summer, the electric two-way valve is opened to drain water; similarly, the operation scheme of the air conditioning unit on the wind side in summer is that after outdoor fresh air passes through the primary filter and the intermediate filter, the temperature of the fresh air is reduced after the outdoor high-temperature fresh air and low-temperature condensation drainage water (14 ℃) in the energy recovery coil pipe exchange heat; the fresh air precooled by the energy recovery coil is sent to an air conditioning control area after being cooled and dehumidified by the main surface cooling coil and reheated by the heating coil;
the energy recovery system is used under two working conditions of winter and summer, and when the working condition of summer is operated, the heat recovery operation scheme in winter is automatically closed; and conversely, when the system operates in winter, the summer heat recovery system is closed.
Compared with the prior art, the invention has the beneficial effects that:
1. the system can realize waste heat recovery under two different working conditions in winter and summer, and respectively recycles the drainage of the electrode humidifier and the condensed water of the air conditioning unit, thereby achieving the effect of energy conservation;
2. when the constant temperature and humidity air conditioning unit is in a heating and humidifying operation state in winter, the drainage of the electrode type humidifier is recycled into the energy recycling box and is sent into an energy recycling coil of the constant temperature and humidity air conditioning unit through a circulating water pump to exchange heat with low-temperature air, the heat in the high-temperature drainage is recycled, the heating capacity of the constant temperature and humidity air conditioning unit is reduced, and energy is saved. Meanwhile, high-temperature drainage is recycled and then changed into medium-temperature water drainage, so that the requirement on high temperature resistance of the pipeline is lowered, and the cost of the pipeline is reduced;
3. under the cooling dehumidification running state in summer of constant temperature and humidity air conditioning unit, the comdenstion water that air conditioning unit produced does not directly discharge, in collecting the energy recovery coil pipe that sends back in the constant temperature and humidity air conditioning unit through circulating water pump among the holding water box, carries out the heat exchange with the outdoor new trend of high temperature, retrieves the cold volume of comdenstion water, makes the new trend cooling, reduces the cold volume of table cold coil pipe, reaches energy-conserving effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the energy recovery system of the present invention operating during winter;
FIG. 3 is a schematic diagram of the energy recovery system of the present invention operating during the summer season.
In the figure:
1. an air conditioning unit box body; 2. a primary filter; 3. a fan motor; 4. a medium-efficiency filter; 5. a surface cooler; 6. a heater; 7. a humidifier nozzle; 8. an energy recovery heat exchanger; 9. a water circulating pump; 10. an energy recovery heat preservation water tank; 11. a water filter; 12. an electric two-way valve; 13. an electric three-way valve; 14. a middle partition plate; 15. a float valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Referring to fig. 1-3, the present invention provides a technical solution:
an energy-saving constant-temperature and constant-humidity air conditioning unit comprises an energy-saving constant-temperature and constant-humidity air conditioning unit, an electrode type humidifier and an energy recovery system;
the energy-saving constant-temperature and constant-humidity air conditioning unit sequentially comprises an air conditioning unit box body 1, an air inlet, a primary filter 2, a fan motor 3, a medium-efficiency filter 4, a surface cooler 5, a heater 6, a humidifier spray pipe 7, an energy recovery heat exchanger 8, an air outlet and a temperature sensor T2;
the energy recovery system comprises a circulating water pump 9, an energy recovery heat-preservation water tank 10, a water filter 11, a pipeline system, an electric two-way valve 12, an electric three-way valve 13 and temperature sensors T1 and T2.
In the above, the energy recovery heat preservation water tank is an open water tank made of a steel plate, and heat preservation cotton is wrapped outside the open water tank;
the water tank is internally provided with intermediate clapboards 14, so that the water tank is completely divided into a water supply side and a water return side to form a water supply and return circulating system, all the intermediate clapboards are provided with float valves 15, when the water supply in the water supply tank exceeds a limited amount, the float valves 15 are opened, the water flows into the water return tank, and meanwhile, an electric three-way valve 13 at the bottom of the water return tank is opened and is discharged by a drain pipe;
the upper part of the water supply tank of the energy recovery heat-preservation water tank 10 is provided with a scale removal filtering device which is formed by sticking non-woven fabrics on a micro-penetration plate, so that the scale in high-temperature drainage is filtered, and the energy recovery heat exchanger is prevented from being dirty and blocked.
When the electrode type humidifier operates, after the humidifying barrel drains water, the electric two-way valve is opened, the bypass valve of the electric three-way valve is closed, the circulating water pump is started to suck the drained water into the water supply tank of the energy heat preservation water tank, when a certain amount of water is collected in the water supply tank, the electric two-way valve and the circulating water pump are started (a control system is provided with time delay, namely the control system is started after the time delay of N minutes compared with the circulating water pump), high-temperature water flows into the energy recovery heat exchanger to carry out heat exchange, and meanwhile, the temperature T2 of wind and the temperature T1 of water behind the heat exchanger are detected;
the return water enters a return water tank, and an electric three-way valve at the bottom of the return water tank is controlled: when the electric two-way valve is opened, the adjusting proportion of the electric three-way valve is that the flow of the water supply pipe of the bypass valve is zero, the flow of the water discharge pipe is 100 percent, and the backwater is discharged completely; when the electric two-way valve is closed, the adjusting proportion of the electric three-way valve is that the flow of the water supply pipe of the bypass valve is 100%, the flow of the water discharge pipe is 0, the return water is subjected to all bypass circulation heat exchange, and when the temperature of T2 is close to that of T1, the bypass is closed, all the water is discharged, and the heat recovery is stopped.
When the constant-temperature and constant-humidity air conditioning unit operates, surface cooling dehumidification generates condensate water, the electric two-way valve is closed, the flow of a bypass valve of the electric three-way valve is 100%, a drain pipe is closed, the circulating water pump is started to suck the condensate water into a water supply tank of the energy heat preservation water tank, when a certain amount of water is collected in the water supply tank, the electric two-way valve and the circulating water pump are started (a control system is provided with time delay, namely the control system is started after N minutes of time delay of the circulating water pump), and the condensate water flows into the energy recovery heat exchanger to carry out heat exchange; the backwater enters a backwater tank, the adjusting proportion of an electric three-way valve at the bottom of the backwater tank is that the flow of a water feeding pipe of a bypass valve is zero, the flow of a drain pipe is 100%, and the backwater is completely discharged.
In the waste heat recovery system, a set of energy recovery device is arranged on the energy-saving constant-temperature and constant-humidity air conditioning unit, the high-temperature water heat discharged by the electrode humidifier is recovered when the air conditioning unit operates in winter, and the high-temperature water is sent into the constant-temperature and constant-humidity air conditioning unit for preheating and heating after being filtered, so that the heat in the high-temperature water is recovered; when the air conditioning unit operates in summer, low-temperature condensate water generated by cooling and dehumidifying of the surface air cooler is recycled for pre-surface cooling in front of the surface air cooler, and cold energy in the low-temperature condensate water is recycled;
the system operates in winter: high-temperature water is continuously discharged when the electrode humidifier works, high-temperature water (about 80 ℃) discharged from a water discharge pipe of the electrode humidifier is sucked into the energy recovery heat-preservation water tank through a water pipe by a circulating water pump, and because the water discharged by the electrode humidifier contains scale, a filtering device for removing the scale is required to be arranged in the energy recovery heat-preservation water tank, and the scale removing filtering device adopts a micro-perforated plate to attach non-woven fabrics, so that the scale filtering effect is effectively achieved; the energy recovery heat preservation water tank is divided into two parts, one part is a water supply tank which stores high-temperature water for the energy recovery heat exchanger of the air conditioning unit to provide the high-temperature water, and the other part is a water return tank which is formed by returning the medium-temperature water after the heat exchange of the energy recovery heat exchanger into the heat preservation tank and performs cyclic utilization or necessary discharge according to the heat recovery requirement of the air conditioning unit; high-temperature water on the side of a water supply tank in the heat-preservation water tank is supplied by a water supply pipe, the high-temperature water passes through the water supply pipe, and is sent into an energy recoverer by a water pump, the high-temperature water at 80 ℃ is subjected to heat exchange with low-temperature air (winter outdoor temperature), the high-temperature water at 80 ℃ is changed into medium-temperature water at 60 ℃ after heat exchange, and the medium-temperature water enters the water return tank side in the heat-preservation water tank through a water return pipe, a water discharge pipe is arranged at the bottom of the water return side of the water tank, an electric three-way valve is arranged, when the electrode humidifier does not discharge water, the return water passes through the electric three-way valve, the return water returns to the water supply pipe through a bypass water pipe for circulating heat exchange, and when the return water temperature T1 detected by a temperature sensor on the water return pipe is close to the outlet air temperature T2 of the heat exchanger, the electric three-way valve is adjusted to enable the flow of the bypass water pipe to be 0 (namely, the water discharge pipe is 100 percent), the low-temperature water in the water return tank is discharged through the water discharge pipe, and the water circulation of the system is stopped; when the electrode humidifier is drained and the water supply tank in the energy recovery water tank can supply water, the energy recovery system recycles the heat recovery;
if the electrode humidifier continuously drains water, the drainage amount exceeds the heat exchange water amount required by the energy recovery coil pipe, namely when a water supply tank in the heat preservation water tank reaches the set height in the tank, the ball float valve is opened, water of the water supply tank flows back to the water tank, and the water supply tank is prevented from overflowing; meanwhile, an electric three-way valve at the bottom of the water return tank is controlled to close the bypass water pipe and drain the water fully, namely the water return tank drains water when the ball float valve is opened;
the system is a water system operation flow, and the operation flow is analyzed from the air side of the air conditioning unit, namely the temperature of the fresh air is increased after the outdoor fresh air passes through the primary filter and the intermediate filter and is subjected to heat exchange with high-temperature drainage (80 ℃) in the outdoor low-temperature fresh air and the energy recovery coil pipe; the fresh air preheated by the energy recovery coil is heated by the main heating coil 6 and humidified by the humidifier 7 to reach a proper temperature and humidity, and then is sent to an air conditioner control area;
the system operates in summer: when the air conditioning unit cools and dehumidifies, the surface cooler usually adopts chilled water of 7-12 ℃ to cool and dehumidify, the temperature of condensed water generated by air is about 14-15 ℃, and the low-temperature condensed water is sucked into the water supply side of the heat preservation water tank through a drain pipe of the air conditioning unit, an adjusting electric three-way valve, a condensing water supply pipe and a water supply pump; the low-temperature condensed water on the water supply side of the heat preservation water tank is supplied by a water supply pipe, the low-temperature condensed water passes through the water supply pipe of an electric two-way valve, a water filter performs secondary filtration, the low-temperature water at 14 ℃ is sent into energy recovery through the water supply pipe by a water pump, heat exchange is performed between the low-temperature water at 14 ℃ and high-temperature air (outdoor temperature in summer), the low-temperature water at 14 ℃ is changed into medium-temperature water at 19 ℃ after heat exchange, the medium-temperature water enters the water return side of the heat preservation water tank through a water return pipe, the flow of the bypass water pipe is 0 (namely the bypass water pipe is closed) through a drain pipe at the bottom of the water return side of the water tank through an electric three-way valve, the drain pipe drains water at 100%, and the medium-temperature condensed water on the water return side is drained by the drain pipe;
when the electric two-way valve is not used in summer or working conditions are switched in winter and summer, the electric two-way valve is opened to drain water; similarly, the operation scheme of the air conditioning unit on the summer wind side is that the temperature of the fresh air is reduced after the outdoor fresh air passes through the primary filter and the intermediate filter and the heat exchange is carried out between the outdoor high-temperature fresh air and low-temperature condensation drainage water (14 ℃) in the energy recovery coil; the fresh air precooled by the energy recovery coil is sent to an air-conditioning control area after being cooled and dehumidified by the main surface cooling coil and reheated by the heating coil;
the energy recovery system is used under two working conditions of winter and summer, and when the energy recovery system operates under the working condition of summer, the heat recovery operation scheme in winter is automatically closed; and conversely, when the system operates in winter, the summer heat recovery system is closed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides an energy-saving constant temperature and humidity air conditioning unit which characterized in that: the energy-saving constant-temperature and constant-humidity air conditioning unit comprises an energy-saving constant-temperature and constant-humidity air conditioning unit, an electrode type humidifier and an energy recovery system;
the energy-saving constant-temperature and constant-humidity air conditioning unit sequentially comprises an air conditioning unit box body (1), an air inlet, a primary filter (2), a fan motor (3), a secondary filter (4), a surface cooler (5), a heater (6), a humidifier spray pipe (7), an energy recovery heat exchanger (8), an air outlet and a temperature sensor T2;
the energy recovery system comprises a circulating water pump (9), an energy recovery heat-preservation water tank (10), a water filter (11), a pipeline system, an electric two-way valve (12), an electric three-way valve (13) and temperature sensors T1 and T2.
2. The energy-saving constant-temperature and constant-humidity air conditioning unit as claimed in claim 1, wherein: the energy recovery heat-preservation water tank is an open water tank made of a steel plate, and heat-preservation cotton is wrapped outside the open water tank;
the water supply and return system is characterized in that intermediate partitions (14) are arranged in the water tank, so that the water tank is completely divided into a water supply side and a water return side to form a water supply and return circulation system, all the intermediate partitions are provided with ball float valves (15), when the amount of water supplied in the water supply tank exceeds a limited amount, the ball float valves (15) are opened, the supplied water flows into the water return tank, and meanwhile, an electric three-way valve (13) at the bottom of the water return tank is opened and is discharged by a water discharge pipe;
the upper part of the water supply tank of the energy recovery heat preservation water tank (10) is provided with a scale removal filtering device which is formed by attaching non-woven fabrics on a micro-penetration plate, so that the scale in high-temperature drainage is filtered, and the energy recovery heat exchanger is prevented from being filthy and blocked.
3. The energy-saving constant-temperature and constant-humidity air conditioning unit as claimed in claim 1, wherein: when the electrode type humidifier operates, after the humidifying barrel drains water, the electric two-way valve is opened, the bypass valve of the electric three-way valve is closed, the circulating water pump is opened to suck the drained water into the water supply tank of the energy heat preservation water tank, when water in the water supply tank is collected to a certain amount, the electric two-way valve and the circulating water pump are opened (a control system is provided with time delay, namely the electric two-way valve and the circulating water pump are opened after the time delay of N minutes compared with the circulating water pump), high-temperature water flows into the energy recovery heat exchanger to carry out heat exchange, and meanwhile, the temperature T2 of wind and the temperature T1 of water behind the heat exchanger are detected;
the return water enters a return water tank, and an electric three-way valve at the bottom of the return water tank controls: when the electric two-way valve is opened, the adjusting proportion of the electric three-way valve is that the flow of the water supply pipe of the bypass valve is zero, the flow of the water discharge pipe is 100 percent, and the backwater is discharged completely; when the electric two-way valve is closed, the electric three-way valve adjusts the proportion that the flow of the bypass valve upper hose is 100%, the flow of the drain pipe is 0, the water return is all by-passed for circulating heat exchange, when the temperature of T2 is close to T1, the by-pass is closed, all the discharge is carried out, and the heat recovery is stopped.
4. The energy-saving constant temperature and humidity air conditioning unit as claimed in claim 1, characterized in that: when the constant temperature and humidity air conditioning unit operates, surface cooling dehumidification generates condensate water, the electric two-way valve is closed, the flow rate of a bypass valve of the electric three-way valve is 100%, a drain pipe is closed, the circulating water pump is started to suck the condensate water into a water supply tank of the energy heat preservation water tank, when a certain amount of water is collected in the water supply tank, the electric two-way valve and the circulating water pump are started (a control system is provided with time delay, namely the control system is started after the time delay of N minutes compared with the circulating water pump), and the condensate water flows into the energy recovery heat exchanger to carry out heat exchange; the backwater enters the backwater tank, the adjusting proportion of the electric three-way valve at the bottom of the backwater tank is that the flow of the bypass valve water supply pipe is zero, the flow of the drain pipe is 100%, and the backwater is discharged completely.
5. A waste heat recovery system as claimed in claim 1, wherein: the waste heat recovery system is characterized in that a set of energy recovery device is arranged on the energy-saving constant-temperature and constant-humidity air conditioning unit, the high-temperature water heat discharged by the electrode humidifier is recovered when the air conditioning unit operates in winter, and the high-temperature water is sent into the constant-temperature and constant-humidity air conditioning unit for preheating and heating after being filtered, so that the heat in the high-temperature water is recovered; when the air conditioning unit operates in summer, low-temperature condensate water generated by cooling and dehumidifying of the surface air cooler is recycled for pre-surface cooling in front of the surface air cooler, and cold energy in the low-temperature condensate water is recycled;
the system operates in winter: when the electrode humidifier works, high-temperature water is continuously discharged, the high-temperature water (about 80 ℃) discharged from a water discharge pipe of the electrode humidifier is sucked into the energy recovery heat-preservation water tank through a water pipe by a circulating water pump, and because the water discharged by the electrode humidifier contains scale, a filtering device for removing the scale is required to be arranged in the energy recovery heat-preservation water tank, and the scale removing filtering device adopts a micro-perforated plate to attach non-woven fabrics, so that the scale filtering effect is effectively filtered; the energy recovery heat preservation water tank is divided into two parts, one part is a water supply tank which stores high-temperature water for the energy recovery heat exchanger of the air conditioning unit to provide the high-temperature water, and the other part is a water return tank which is formed by returning the medium-temperature water after the heat exchange of the energy recovery heat exchanger into the heat preservation tank and performs cyclic utilization or necessary discharge according to the heat recovery requirement of the air conditioning unit; high-temperature water on the side of a water supply tank in the heat-preservation water tank is supplied by a water supply pipe, the high-temperature water passes through the water supply pipe, a water filter performs secondary filtration, the high-temperature water at 80 ℃ is sent into an energy recoverer through the water supply pipe, the high-temperature water at 80 ℃ is subjected to heat exchange with low-temperature air (winter outdoor temperature), the high-temperature water at 80 ℃ is changed into medium-temperature water at 60 ℃ after heat exchange, the medium-temperature water enters the side of a water return tank in the heat-preservation water tank through a water return pipe, a water discharge pipe is arranged at the bottom of the water return side of the water tank, an electric three-way valve is arranged, when the electrode humidifier does not discharge water, the water return passes through the electric three-way valve, the water return is returned into the water supply pipe through a bypass pipe for circulating heat exchange, and when the water return temperature T1 detected by a temperature sensor on the water return pipe is close to the air outlet temperature T2 of the heat exchanger, the electric three-way valve is adjusted to enable the flow of the bypass pipe to be 0 (namely, the water discharge pipe is 100 percent, and the low-temperature water in the water return tank is discharged by the water discharge pipe, and the water circulation of the system is stopped; when the electrode humidifier is drained and the water supply tank in the energy recovery water tank can supply water, the energy recovery system recycles the heat recovery;
if the electrode humidifier continuously drains water, the drainage amount exceeds the heat exchange water amount required by the energy recovery coil pipe, namely when a water supply tank in the heat preservation water tank reaches the set height in the tank, the ball float valve is opened, water of the water supply tank flows back to the water tank, and the water supply tank is prevented from overflowing; meanwhile, an electric three-way valve at the bottom of the water return tank is controlled to close the bypass water pipe and drain the water fully, namely the water return tank drains water when the ball float valve is opened;
the system is a water system operation flow, and the operation flow is analyzed from the wind side of the air conditioning unit, namely the temperature of fresh air is increased after the outdoor fresh air passes through the primary filter and the intermediate filter and is subjected to heat exchange with high-temperature drainage (80 ℃) in the outdoor low-temperature fresh air and the energy recovery coil; the fresh air preheated by the energy recovery coil is heated by the main heating coil 6 and humidified by the humidifier 7 to reach a proper temperature and humidity, and then is sent to an air-conditioning control area;
the system operates in summer: when the air conditioning unit cools and dehumidifies, the surface cooler usually adopts chilled water of 7-12 ℃ to cool and dehumidify, the temperature of condensed water generated by air is about 14-15 ℃, and low-temperature condensed water is sucked into the water supply side of the heat preservation water tank by the water discharge pipe of the air conditioning unit, the adjusting electric three-way valve and the water supply pump through the condensed water supply pipe; the low-temperature condensed water on the water supply side of the heat preservation water tank is supplied by a water supply pipe, the low-temperature condensed water passes through the water supply pipe of an electric two-way valve, a water filter performs secondary filtration, the low-temperature water at 14 ℃ is sent into energy recovery through the water supply pipe by a water pump, heat exchange is performed between the low-temperature water at 14 ℃ and high-temperature air (outdoor temperature in summer), the low-temperature water at 14 ℃ is changed into medium-temperature water at 19 ℃ after heat exchange, the medium-temperature water enters the water return side of the heat preservation water tank through a water return pipe, the flow of the bypass water pipe is 0 (namely the bypass water pipe is closed) through a drain pipe at the bottom of the water return side of the water tank through an electric three-way valve, the drain pipe drains water at 100%, and the medium-temperature condensed water on the water return side is drained by the drain pipe;
when the electric two-way valve is not used in summer or working conditions are switched in winter and summer, the electric two-way valve is opened to drain water; similarly, the operation scheme of the air conditioning unit on the summer wind side is that the temperature of the fresh air is reduced after the outdoor fresh air passes through the primary filter and the intermediate filter and the heat exchange is carried out between the outdoor high-temperature fresh air and low-temperature condensation drainage water (14 ℃) in the energy recovery coil; the fresh air precooled by the energy recovery coil is sent to an air-conditioning control area after being cooled and dehumidified by the main surface cooling coil and reheated by the heating coil;
the energy recovery system is used under two working conditions of winter and summer, and when the energy recovery system operates under the working condition of summer, the heat recovery operation scheme in winter is automatically closed; and conversely, when the system operates in winter, the summer heat recovery system is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210748369.5A CN115200106A (en) | 2022-06-29 | 2022-06-29 | Waste heat recovery system and energy-saving constant-temperature and constant-humidity air conditioning unit |
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| CN202210748369.5A CN115200106A (en) | 2022-06-29 | 2022-06-29 | Waste heat recovery system and energy-saving constant-temperature and constant-humidity air conditioning unit |
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