CN1369050A - Modular heat pump system for drying and air-conditioning - Google Patents

Modular heat pump system for drying and air-conditioning Download PDF

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Publication number
CN1369050A
CN1369050A CN99815379A CN99815379A CN1369050A CN 1369050 A CN1369050 A CN 1369050A CN 99815379 A CN99815379 A CN 99815379A CN 99815379 A CN99815379 A CN 99815379A CN 1369050 A CN1369050 A CN 1369050A
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CN
China
Prior art keywords
air
assembly
heat pump
heat
condenser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN99815379A
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Chinese (zh)
Inventor
邹绍强
莫罕迈德·N·A·哈拉德
何锐千
蔡建永
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National University of Singapore
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National University of Singapore
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Filing date
Publication date
Priority to SG98048127 priority Critical
Priority to SG9804812A priority patent/SG83109A1/en
Priority to SG9905175A priority patent/SG83158A1/en
Priority to SG99051757 priority
Application filed by National University of Singapore filed Critical National University of Singapore
Publication of CN1369050A publication Critical patent/CN1369050A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements
    • F26B23/001Heating arrangements using waste heat
    • F26B23/002Heating arrangements using waste heat recovered from dryer exhaust gases
    • F26B23/005Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B40/00Subcoolers, desuperheaters or superheaters
    • F25B40/02Subcoolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B5/00Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B6/00Compression machines, plant, or systems, with several condenser circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08Humidity
    • F26B21/086Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/22Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

A modular versatile heat pump system for drying and air-conditioning is disclosed. The refrigerating components of the heat pump, comprising the compressor (40a), condenser (41), evaporators (45, 52) and expansion valves, are housed in a chassis with three interface ports (74a, 75a, 76a) for easy integration with any air-handling chamber via flexible industrial couplers. For drying application, the design makes use of conventional import/export transport containers with modification for loading and unloading of products. It adopts the first-in first-out process for loading and unloading of the products. For air-conditioning application, the present design can be coupled to the chamber to provide air-conditioning during system repair and maintenance. The proposed heat pump system has several advantages, namely, easy chamber scale-up to meet increase production, significant reduction of production down time, eliminate thermal discomfort during maintenance of refrigeration components for air conditioning systems.

Description

The modular heat pump system that is used for dry and air conditioning
Technical field
The present invention relates to be used for the design of the modular heat pump assembly of dry and air conditioning.The present invention relates to a kind of heat pump components structure at least in one embodiment, and wherein cooling element can be connected and separate with any air-handling chamber that is used for drying or air-conditioning purpose easily.
Background technology
Commercially available heat pump drier design has cooling element and the hothouse as a complete drying unit.For this drying machine, the thermic load refrigeration output that heat pump is required is suitable for comprising latent heat and sensible heat customizes according to the size and the maximum product load of hothouse.Because local or all replacements of cooling element, these drying machines are not really flexible to handle the product drying ability that increases for further expanding chilling unit.As a result, manufacturer must invest and expand its dry run to satisfy user's demand.In addition, under the situation of element fault, the drying work of heat pump drier must be ended, and produces drying machine downtime and loses output.Under air-conditioning maintenance and maintenance situation, must cut off chiller in order to repair work, cause in the room that air-conditioner serves or air regime change in the weather process chamber.The room occupant will meet with the acute variation of air regime and feel under the weather thus.Under the situation of the weather process chamber that is used to store, the product that may cause depositing rots.
The present invention has advantageously provided the multipurpose heat pump assembly, thereby chilling unit and air-handling chamber were assembled before utilizing such as the connector engages of industrial gas joint specially at them.The air that these joints allow to receive after the air that is used to regulate also will be regulated is discharged in the chamber.Air themperature, speed and absolute humidity have been considered in this air conditioning.
Common available heat pump components, as the heat pump components of drying machine, for single phase.Single phase, heat pump had an evaporimeter.This evaporimeter must can absorb sensible heat and latent heat load.
According to the present invention, proposed to be combined with two stage heat pumps of two phase evaporation systems, one of them evaporimeter another evaporimeter is relatively worked under elevated pressures.Preferably, in drying system, two stage system can reclaim more latent heat from dry air, and have flexibility to finish the various control schemes of humidity control better that are used for.For a lot of dry application occasions, in order to reduce to be used for the drying energy of product dehumidifying and to improve the quality of products, energy reclaims and air conditioning all has important function.
In improving heat recovery, high pressure evaporator is preferably born the part of heat of cooling load.Found that this allows low pressure evaporator to contribute its more thermal energy to be used for dehumidifying.In order better to carry out humidity control, the configuration of evaporimeter in air conduit preferably allows with two kinds of method control air humiditys.A kind of method is for utilizing the air by-pass process control dehumidifying by evaporimeter.Another kind method comprises the adjusting of the average coiled pipe surface temperature of high pressure evaporator, to be used to eliminate sensible heat and latent heat.
Another is improved to native system and combines external boiler.External boiler serves a dual purpose.Its first act as the fast starting that promotes heat pump.This be by just in cyclic process from extraneous " absorption " sensible heat, reach suitable stress level up to condenser.Its second act as " void " load, when occurring hanging down latent heat load in chamber, assistant load is joined in the refrigerating system.When the latent heat load in the hothouse was low, external boiler had advantageously guaranteed to be used for external loading constant of recuperation of heat.This interference is of value to initial latent heat load height and along with dry run changes rate of descent zone (fallingrate region) over to and the dry run that weakens gradually.
As mentioned above, this two stages heat pump components has also advantageously generated the multistage heat-pump-type drier that is used for advanced design, to satisfy the higher product quality and the built modular module of energy efficiency needs.
So, the present invention has advantageously provided the better energy recovery by improving the ratio that latent heat and total amount of heat reclaim, and by carry out sensible heat and latent heat exchange preferably with evaporimeter and condenser, better controls dry gas.In addition, the present invention has advantageously provided a kind of like this heat pump, it is equipped with the constant system of load that quick starts mechanism and for example guarantee to be used for recuperation of heat in whole dry run, and can be easily integrated into the efficient two stage scene heat pumps on any chamber.
That is, advantageously provided the multipurpose heat pump assembly, thereby but the heat pump elements that is assembled into modular unit with portable or transportation characterization can regulate use portable and maybe can transport chamber and engage or separate with any drying or normal air of being used for.The very flexible drying machine that makes of this heat pump structure can be expanded to satisfy higher product demand easily according to chamber size that changes and structure.The present invention can not produce downtime easily carrying out maintenance and repair work on the heat pump elements yet in dry run, it is rotten that product can not cause in apotheca, and can not make occupant in air-conditioned room feel uncomfortable on the temperature.
Summary of the invention
According to the present invention, the modular heat pump assembly that is suitable for joining to conditioning chamber is provided, this heat pump components comprises:
The two phase evaporation device systems that comprise high pressure and low pressure evaporator that are used for air conditioning;
Be used for sensible heat is imported airborne hot gas condenser;
Compressor;
Be used to be beneficial to and keep latent heat load constant outer evaporimeter;
At least one is used for from the inlet of the conditioning chamber admission of air of being regulated by heat pump components; And
Air after being used for will regulating from heat pump components is discharged into the outlet in the conditioning chamber.
Heat pump components also is provided, and it comprises:
Heat pump unit, it comprises that (i) comprises the high pressure that is used for air conditioning and two phase evaporation device systems of low pressure evaporator; (ii) be used for sensible heat is imported airborne hot gas condenser; (iii) compressor; And (iv) be used for from hot gas condenser admission of air and be used to keep latent heat load constant outer evaporimeter; And
Be suitable for receiving the air be conditioned and with the hothouse of air re-circulation to the heat pump unit from heat pump unit.
The present invention preferably is fit to be applied to drying and air conditioning.The dry air that enters heat pump unit is at first regulated by evaporimeter, is then regulated by the hot gas condenser before turning back in the conditioning chamber by another mouthful.Air can be according to desirable cooling of chamber atmosphere situation or heating.
The structure optimization of heat pump makes high pressure evaporator play part drying/humidification coiled pipe, and low pressure evaporator plays special-purpose humidification coiled pipe.In addition, in a preferred embodiment, back pressure regulating valve is installed on the drain line of high pressure evaporator constant to guarantee evaporating pressure.
In a preferred embodiment, the hot gas condenser comprises sub-cooler construction, and preferably includes hot gas condenser and two sub-coolers.This structure has advantageously provided and has been used for dry air to obtain the required sensible heat of ideal temperature.Preferably, this assembly also comprises control device, and it is used for guaranteeing providing enough sensible heats air themperature to obtain to be scheduled to the dry air from hot gas condenser and sub-cooler construction.Thereby the air themperature of dry air can be regulated as required.
In order to regulate air themperature, this assembly preferably includes condenser, and such as air-cooled condenser, it helps to discharge the airborne unnecessary heat of system's inner drying.In addition, in a preferred embodiment, assembly comprises the bypass damper system, is used to regulate the bypath air stream by assembly.Additional control device can also be provided, be used to regulate the bypass damper system to keep the ideal humidity of dry air.
In order to satisfy the higher temperature demand of dry air, assembly can also comprise auxiliary heater, to help introducing additional sensible heat in dry air.Preferably, provide another control device that activates auxiliary heater as required.
Heat pump components for example advantageously reaches, and the optimal heat of the efficient and cost-effective drying of industrial and agricultural products reclaims.This is to be used to cool off with the high pressure of removal moisture drying medium and low pressure inner evaporator and external boiler realize.In order to reclaim latent heat before the dehumidified air, the gas of discharging in the hothouse at first passes high pressure evaporator and experiences precooling process at low pressure evaporator.The air that the configuration of evaporimeter allows different proportion is by bypass and in the mixed downstream of coiled pipe.This can be controlled the humidity of dry air by the synchronizing process of aforesaid dehumidifying and mixing.
In condenser one side, two sub-coolers are preferred for heat recovery.Sub-cooler has been guaranteed: for hot operation, heat transfer area available between air and the refrigerant is bigger to be recovered by making to come the more heat of flash-pot.
Native system also is combined with passive evaporimeter one saver, is used for before evaporimeter precooled air and preheated air before condenser.This equipment also plays cooling device, thereby can finish cold-peace hot-air drying.
Brief Description Of Drawings
Below with reference to the embodiment of the invention being described and being used to explain that the accompanying drawing of the principle of the invention is described in more detail the present invention.Yet be understood that: schematically accompanying drawing is used for explaining and explanation structure of the present invention, and not as the determinate definition of the present invention, this limited content should be made with reference to the specification appending claims.
Fig. 1 illustrates two stage heat pump drier unit.As shown, two of high pressure and low pressure evaporimeter series arrangement.One saver is used for precooling and preheating and drying air around these two evaporator arrangement;
Fig. 2 is the schematic diagram that the heat pump circulation is shown;
Fig. 3 is the schematic diagram that the modular heat pump assembly is shown, and has the cooling element of assembling on relevant position separately;
Fig. 4 is the application schematic diagram that the heat pump components that is used for the air conditioning purpose is shown;
Fig. 5 is the side view of the heat pump drier that assembles, shows the conditioning chamber and the heat pump elements that are positioned in the modular unit;
Fig. 6 is the schematic diagram that high pressure and low pressure evaporator system are shown;
Fig. 7 illustrates the controlling organization that is used for external boiler so that system can quick start and can continue to absorb the schematic diagram of latent heat load;
Fig. 8 illustrates the circuit diagram that condenser is connected with sub-cooler.This illustrates from the three-way control valve to the vaporium and the cryogen flow of air-cooled condenser; And
Fig. 9 illustrates the schematic diagram that is used to stop heat pump and keeps the controlling organization of air themperature with auxiliary heater group (heater bank).
The specific embodiment of the invention
The design is from the test that two stage heat pump driers carried out that utilizes the laboratory model machine and envision.New structure is considered to better control scheme and energy reclaims more effective.This structure has expanded to the field drying machine, and it has the feature of easy interface between chamber and the modular heat pump unit.
In with the lower part, detailed description is used for chamber structure, cooling element and the control scheme of parallel evaporation structure with the heat pump cycle of adjusting air humidity.
Fig. 1 illustrates the two stage heat pump drier unit that link to each other with hothouse.Drying machine 10 is designed to the cooling element and hothouse 12 separations of heat pump cycle 11 as can be seen.This structure makes hothouse further expand better, and need not change the position of coiled pipe and other cooling element.In addition, this structure allows to make up the field drying machine, can easily integrate with any containerzation chamber at this chilling unit.This structure pattern allows expansion chamber and maintenance system neatly.In this explanation, circulating air (shown in the arrow) passes inner air door (damper) 13 and enters heat pump 11.Also provide generally the latter stage of drying cycles use to remove the bypass air door 14 of last moisture in the air.
Air is sent to precooling saver 15a from chamber 12, and delivers to high pressure evaporator 16 and low pressure evaporator 17 then respectively.Air passes the second saver 15b that is used for preheating then.After this, air passes the heating arrangement that comprises hot gas condenser 18 and two sub-cooler 19a and 19b and optionally heat booster 20.Air is got back to the chamber 12 that is used for drying purpose then.
Can be provided with also that outside air door 14a is beneficial to entering of fresh air and used air is discharged from assembly.
Though not shown in the drawings, condensed water preferably is set collects ditch and drainpipe, be used for removing condensed water from chamber.
Fig. 2 shows the refrigerant cycles of heat pump.Heat pump cycle comprises two evaporimeters, one relative another in elevated pressures work.The advantage of this two stage system comprises: reclaim more potential from dry gas, and finish a plurality of control schemes that are used for better humidity control neatly.Though not shown in the drawings, condensed water preferably is set collects ditch and drainpipe, be used for removing condensed water from chamber.
Fig. 2 shows two inner evaporator, i.e. high pressure evaporator 26 and low pressure evaporator 25, and external boiler 28.Dry gas from chamber at first passes high pressure evaporator 26 with obvious precooling, then passes through low pressure evaporator 25 with dehumidifying.Dry air absorbed sensible heat and was adjusted to desirable temperature from hot gas condenser 35 before it is discharged into thermal control units.Temperature controlled processes is finished like this: regulate flow velocity and become required size, arrive hot gas condenser 35 by three-way control valve 21, and remaining is bypassed to mixing chamber 33.The refrigerant of discharging from hot gas condenser 35 mixed in mixing chamber 33 with refrigerant from bypass line 34 before being discharged to air-cooled condenser 32.This refrigerant was collected in liquid receiver 31 places then expand into three evaporimeters 25,26 and 28 by three manual thermostatic expansion valves (TEV) or electric expansion valve (EEV) 27,29 and 30 before.Vapor refrigerant from low pressure evaporator 25 and external boiler 28 is collected in vaporium 23 places.Before entering vaporium 23, be adjusted to the stress level of low pressure evaporator 25 by back pressure regulating valve 24 from the refrigerant of high pressure evaporator 26.Enter the suction circuit of compressor and be compressed to the pressure size of its discharge by compressor 22 from the steam of vaporium 23.When using EEV, the surface temperature of high pressure and low pressure coiled pipe can be set by the desirable temperature value of input on the EEV control panel.This can control the pressure of two evaporimeters flexibly, this be since in two phase evaporation processes the refrigerant saturation temperature directly corresponding to the pressure of refrigerant.When using TEV, have only back pressure regulating valve to be used to regulate the high-pressure evaporation actuator temperature.In both cases, under high pressure or low pressure (when the using EEV) situation or under high pressure (when the using TEV) situation,, can regulate the absolute humidity of air by regulating the temperature of evaporimeter coiled pipe.
Fig. 3 shows the modular heat pump assembly that is equipped with a floss hole 58 and two air receiving ports 55 and 57.High pressure evaporator 45 is arranged in parallel in low pressure evaporator 52 tops.Except coiled pipe surface temperature method mentioned above is regulated the air humidity, air humidity also can be regulated self closing door 54 and 56 by one group of interconnection and be regulated.Adjustment process is undertaken by delivering to air door 54 and 56 from the control signal that is installed in the PID controller 47 on the control panel 46.The control air door has been regulated the air mass flow by high pressure and low pressure evaporator.Thereby, can carry out the dehumidification process of dry air, up to reaching desirable air humidity.By making compressor 40a make the generalization of heat pump structure based on the electric energy work of supplying with by commercially available diesel oil or gasoline engine generator 40.Direct into via the pond 48 of dripping from the condenses water of high pressure evaporator 45 and to discharge pond 53 and enter low pressure evaporator 52 to prevent condensed water.Be discharged into the external environment by discharge tube 50 from evaporimeter 45 and 52 condensed waters of collecting.External boiler 49 is positioned at the outside of framework as shown in the figure.From around the air of environment be inhaled into by air vane 51, with by external boiler 49 coolings.Absorb sensible heat from external environment and improved the recuperation of heat that is used for heat pump.The structure of having pointed out the modular heat pump unit does not depend on the building benchmark.Although adopt two step cycle to carry out air conditioning, this heat pump structure is owing to the reason in technology and space is unique on its configuration and structure.At first, it can utilize two or more air doors that have the evaporimeter of parallel organization configuration to regulate air humidity.Because parallel configuration, we provide air to flow through the path of each evaporimeter before the mixed downstream of evaporimeter at air.This configured in parallel has two advantages.At first it has guaranteed air uniform distribution feeding product carrier, thereby has prevented any air stagnant areas in the chamber.The second, it can dispose heat pump elements in miniaturization, and this is the essential characteristic that the heat pump structural module is used.
As shown in Figure 3, provide enough circulating energy to shift dry air onto outlet 58 from suction inlet 55 and 57 with the circulating fan 44 of axial or centrifugal pattern work.Air inlet skylight 42 is used for some fresh airs are incorporated into the dry air circulation.Air-cooled condenser 41 has been installed so that too much heat is discharged in the environment.The control panel 46 that puts PID controller, starting and termination switch is positioned at frame facet and is used for control and supervision.
Whole framework can via receiving port 55 and 57 and floss hole 58 be connected to conditioning chamber.Flexible industrial gas joint is used for each mouthful of assembly is connected to conditioning chamber.
Also can consider other work structuring of evaporimeter.For example, the modular heat pump unit also can design the high pressure and the low pressure evaporator of series arrangement, is used to cool off the purpose of latent heat and sensible heat equally.Other possible structure is independent evaporimeter, and it is built into and makes high pressure and low pressure evaporator be integrated but work under contingent condition.
The application of the modular heat pump unit of air conditioning was used for the hot perishable products that is easy to rot in Fig. 4 had illustrated and has been used between cold storage when heat condition changes a period of time between this cold storage.Fig. 4 illustrates two conduits 61 and 66 that have a common boundary with the heat pump that is used for refrigerating air-conditioner.In cold air is discharged between storage by air nozzle 65.Last air turns back to heat pump and is used for regulating again.One is used for discharging air and another industrial gas joint 62 and 63 that is used for air is sucked heat pump is used to engage air control module and heat pump from heat pump.This structure optimization ground is used for temporary transient cold air simultaneously in the heat-pump apparatus maintenance and deposits product.
Fig. 5 illustrates and is modified to be connected on the assembly of the present invention can make up the commercially available transportation chamber of dry component.Be used for the loading and unloading product and be used to provide dry air has significantly been reduced the fund cost from the use of the common cask of the chamber of heat pump unit guiding product.Hothouse 71 is separated into two segmentations by three dividing plates 72,72a and 72b.These three dividing plates 72,72a and 72b have set up the U-shaped passage catheter, be used for dry air via mouth 75,75a, 76 and 76a will flow to the load wagon 78a that has product carriage 78b from the dry air of mouth 74 and 74a before turning back to heat pump.Recirculation fan 73 has been installed so that the additive air that flow to product to be provided.This product correctly was configured on the netted carriage 78b before being positioned on the wheeled vehicle 78a.This car is shifted onto in the chamber by loading door 79 then, and at first the carriage of Zhuan Zaiing is nearest from heat pump.After being dried to desirable water content, after door 77a opened, product left hothouse via unloading part 77.Be configured to product drying this product of fast discharging after the desirable water content in case have the unloading part 77 of a 77a.Therefore, this drying machine adopts first-in first-out process.
The mouth that is connected with the heat pump framework is positioned at 74a, 75a and 76a place.Exhaust skylight 70 is used for dispersing some circulating airs from chamber, as shown in Figure 3 after fresh air is incorporated into air circulation via air dampers 42.From Fig. 5, easily see the chamber that can connect different size, as long as interface port links to each other.Thereby this structure is carried out system extension easily.The structure of chamber adopts first-in first-out process and can load and unload dry products fast but completely new concept owing to it.Equally, dividing plate can make dry air be evenly distributed to the product carriage, causes the even drying of product.In addition, chamber can be fitted with the go-cart guide rail to receive the product go-cart.These guide rails can be static or the part of transfer system, and it allows product continuous-flow or flows in batches.
Two the stage heat pump drying system be designed to improve heat recycle process, thereby and improve the thermal efficiency of drying machine.Basic principle in the heat recycle process is that improvement latent heat on evaporimeter shifts to gross energy ground.Illustrate with the lower part how two stage system can improve heat recycle process.
Inner evaporator (high pressure and low pressure)
Fig. 6 illustrates the connection of two inner evaporator.Native system utilizes two direct expansion inner evaporator to expand into the ideal humidity that two different pressures levels reach air by the liquid refrigerant of self cooling condenser in the future.Two thermal expansion valves 85 expand into two different stress levels with 86 refrigerant that are used for leaving condenser.Application in two evaporimeters 83 of different pressures level and 84 has advantageously improved on evaporimeter latent heat to the transfer of total refrigeration energy, and can control the humidity of dry air better.The dry air that leaves hothouse is cooled to its dew point or following behind high pressure evaporator 83.By this way, high pressure evaporator 83 plays part drying/humidification coiled pipe, and low pressure evaporator 84 works to have the special-purpose humidification coiled pipe of stronger dehumidifying effect.The adjusting of the refrigeration output when using direct expansion evaporimeter coiled pipe to help chamber internal latent heat load variations.Fig. 6 also shows back pressure regulating valve 81 and how to be installed on the drain line of high pressure evaporator.This adjuster has been guaranteed constant evaporating pressure, and has guaranteed the constant of evaporimeter coiled pipe surface temperature thus.Adjustment process realizes by throttling in compressor sucks circuit 81a.Amount of refrigerant and evaporimeter load matched by coiled pipe.
External boiler
Fig. 7 shows the control structure of external boiler.External boiler 114 plays double action.It first act as and helps the heat pump drier fast starting.This is by when compressor discharge pressure 120 during to preset value, and pressure switch 116 is delivered to normally closed solenoid valve 112 with a switching signal 117 and realized.This makes flow of refrigerant arrive thermal expansion valve 113 and external boiler 114, and shown in flowmeter 111, the heat of the environment that causes coming from the outside is absorbed by external boiler 114.When compressor discharge pressure 120 arrived another preset value, another switching signal was sent to magnetic valve 112, and terminate flow is to the refrigerant of thermal expansion valve 113, thus the work of cut-out external boiler 114.
Second effect of external boiler 114 is as " void " load, additional sensible heat load is joined in the refrigerating system when low latent heat load occurring in chamber.When hothouse internal latent heat load was low, it is constant that external boiler 114 guarantees to be used for the outside latent heat load of recuperation of heat.It is high and along with dry run enters second rate of descent zone and the dry run that weakens gradually that this interference is of value to initial latent heat load.During second rate of descent, be sent to PID controller 119 from the feedback signal 122 of product weight acquisition, the measured value of loading at the chamber internal latent heat.Be lower than setting value if product weight is reduced to, then controller 119 is delivered to magnetic valve 112 with a switching signal 118, and activates magnetic valve.This action makes flow of refrigerant arrive thermal expansion valve 113, and this valve 113 arrives external boiler 114 based on thermometric bubble (bulb) temperature 115 with refrigerant distribution again.This just makes the heat of the environment that comes from the outside be absorbed by external boiler.Under this condition, confirmablely be: because the rate of descent of product, the uptake of the latent heat energy that can compensated cavity indoor latent heat losses is required, and can keep the latent heat absorptivity of system constant.
Condenser and sub-cooler
Fig. 8 shows hot gas condenser 124 and two sub-coolers 125 and 126 be connected.A hot gas condenser 124 adds that two sub-coolers 125 and 126 provide the required sensible heat of air that is used for reaching ideal temperature.Two sub-coolers 125 and 126 are condensed into refrigerant by being used in that liquid available transmission area is bigger to reclaim extra heat from steam state.Two sub-coolers 125 and 126 use make removal process the best, and have improved whole energy efficiency.
Saver
The refrigerant saver is installed after reaching before high pressure and low pressure evaporator coiled pipe.Saver is born part evaporator cools task and condenser heating tasks.Its before air enters evaporimeter precooled air and before air enters the hot gas condenser preheated air.The transfer of heat of flash-pot one side air has strengthened the moisture of heat pump drier from ability to the use of the saver of opposite side air in the future.The air precooling of evaporimeter one side can be used in the major part of cooling worm to divide from air dried up.
Desirable dry air situation produces and controls by utilizing three controllers.Controller is used to provide enough sensible heats from hot gas condenser (HGC) and two sub-coolers (SC1 and SC2) so that dry air is reached air themperature.Second controller is used to control from auxiliary heater input sensible heat to satisfy the demand of higher temperature.The 3rd controller is used to regulate the surface and the bypass air door of evaporimeter, so that control dehumidification process and the ideal humidity of the air that keeps dry.
Air themperature
Fig. 8 shows the controlling organization of control drying air temperature.Air themperature is controlled by continuous P ID signal is sent to three-way control valve 123.This valve regulation refrigerant steam flow to HGC124, SC1125 and SC2 126, and bypass is fallen remainder before two circuit 128a and 128b are intersected in 1 128c.The refrigerant of Hun Heing enters air-cooled condenser 129 then.Air-cooled condenser 129 is used for before superfluous heat enters liquid receiver 130 it being dispersed.
Fig. 9 illustrates another control scheme and saves by utilizing auxiliary heater 131 to provide sensible heat to improve heat with the final stage in drying to dry air.For 10% to 20% of the decline of drying, about dry run, air humidity is consistent relatively.Because the sensible heat of removing product humidity is provided continuously, have only the temperature of dry air to reduce.Therefore, on economic implications, heat pump closed and heat continuously and will reduce job costs with auxiliary heater group 131.In order to realize this point, be input to PID controller 134 from the feedback signal of the machine 138 of weighing, this controller 134 is delivered to compressor and auxiliary heater group respectively with two synchronizing signals 135 and 135a again.Signal 135a actuation switch relay 132 and when signal 135 interrupts normally closed switch relay 136a cuts out the contact of auxiliary heater group.In case relay 136a interrupts, open potential free contact 137.This causes motor start relay 136 to cut off from the three phase mains to the screw compressor 133 signal.This a succession of Event triggered in auxiliary heater group 131 heater and interrupt screw compressor 133, cause heat pump to be closed and with auxiliary heater group 131 control air themperatures.
Air humidity
The 3rd PID controller is used to control self closing door.Air door is regulated by the surface of evaporimeter and the air-flow of bypass air door.The air that quilt by evaporimeter dehumidifies mixes with the air of bypass to keep the desirable humidity of air.
Second method of humidity control is regulated the HP evaporimeter according to back pressure regulating valve shown in Figure 6 81 operating pressure.The operating pressure of HP evaporimeter plays the effect into the accurate indication of evaporating coil temperature.In a lot of air conditioning applications, the coiled pipe temperature that remain unchanged will accurately be controlled exactly and remove sensible heat and latent heat.By the accurate adjusting of back pressure regulator 81, the coiled pipe average surface temperature is set to remove required sensible heat and latent heat, obtains the air humidity that needs.
Air velocity
Dry air is controlled by the three-phase frequency inverter to the flow velocity of chamber.By the adjusting inverter frequency and from air blades airspeedometer reading, the air velocity that enters chamber can be set to desirable volume flow.
Refrigerant cycle control
Work in the working range of recommending in order to ensure screw compressor, condensation temperature is set in the scope of 45 ℃ to 55 ℃ (behind desuperheats compressor discharge place record be respectively 16.5 cling to 21 crust) and works.The suggestion lower limit is used for 35 ℃ ambient temperature, and allows 10 ℃ temperature deviation, is used for by air-cooled condenser enough heats being dispersed environment.Upper limit purpose is by preventing that motor overheating from guaranteeing the life-span of compressor.In evaporimeter one side,, generally be set at 5 ℃ SST in order to obtain the refrigeration output of 14.2kW.Can set lower evaporating temperature, but the possibility that can exist coiled pipe to freeze.Simultaneously, corresponding refrigeration output will reduce.The connection of external boiler and the pressure of closing are set at 14 crust and 16 crust respectively, to reach desirable condensation temperature and to keep evaporator temperature within working range.
Example
Carry out the time of initial commissioning test with evaluating system stability and arrival stable state operating mode.Table 1 is illustrated in the chamber without any the result who measures gained under the situation of latent heat load from air side.This example is an illustrative purposes only, and never should become restriction of the present invention.
Table 1-measures the result of gained from heat pump and air side
The running parameter of compressor and heat pump
The compressor operating electric current 8.5 ampere
The hair-dryer running current 50Hz, 3.2 amperes
Suction pressure 4.0 to 5.0 crust
Blowdown presssure 19 to 21 crust
Chamber temp ????50℃
Relative humidity ????25%
Air velocity ????2.8m/s
The air side temperature
Triple channel temperature PID sets ????48.5℃
Behind the hothouse ????47.5℃
Behind the precooling coiled pipe ????44.0℃
Behind the HP evaporimeter ????22.5℃
Behind the LP evaporimeter ????13.5℃
After the preheating ????18.6℃
Behind the SC2 ????32.0℃
Behind the SC1 ????37.0℃
Behind the HGC ????48.3℃
Based on the value of table 1 and the energy consumption of compressor, calculating the COP of heat pump when 48.5 ℃ of work is 2.96.When having latent heat load in chamber, we require the higher heat recovery and the COP of raising.
Mark
The COP coefficient of performance does not have unit
The EC saver-
HGC hot gas condenser-
The HP high pressure evaporator-
The LP low pressure evaporator-
The PID proportional-integral-differential-
SC1 cooler 1-
SC2 cooler 2-
The saturated delivery temperature of SDT ℃
SMER specified moisture separation rate kg/kWh
The saturated inlet temperature of SST ℃
The application of above-mentioned modular construction is also non exhaustive, and it expands to outside the dry and cold storage application.The notion of being convenient to the joint that has a common boundary between equipment and the air conditioner unit and separation method can be used for a lot of air conditioning applications occasions by the choose reasonable of expansion valve, compressor, condenser, evaporimeter and refrigerant.A further specifying property is exemplified as portable reserve cooling device, and it can assemble and be installed to any air conduit system easily during air-conditioning is safeguarded.This just provides temporary transient air conditioning to the room in the cooling element maintenance.Equally, assemble with said method if having a plurality of unit of the heat pump of different refrigeration outputs, the design can advantageously strengthen the refrigeration output of any air-conditioning system, and only need change very little or do not change.

Claims (26)

1. modular heat pump assembly that is suitable for being connected on the conditioning chamber, described heat pump components comprises:
The two phase evaporation device systems that comprise high pressure and low pressure evaporator that are used for air conditioning;
Be used for sensible heat is introduced airborne hot gas condenser;
Compressor;
Help keeping latent heat load constant outer evaporimeter;
At least one is used for from the inlet of the described conditioning chamber admission of air of being regulated by described heat pump components; And
Be used for to be discharged into from the air heat pump assembly after regulating the outlet in the conditioning chamber.
2. assembly as claimed in claim 1, wherein, described high pressure and low pressure evaporator are with parallel or serial structure configuration.
3. assembly as claimed in claim 1, wherein, described high pressure and low pressure evaporator are provided by the independent evaporimeter coiled pipe with the variable pressure that is used for latent heat and sensible heat air conditioning.
4. assembly as claimed in claim 1, wherein, described high pressure evaporator plays part drying/humidification coiled pipe, and described low pressure evaporator plays special-purpose humidification coiled pipe.
5. assembly as claimed in claim 1, wherein, back pressure regulating valve is installed on the drain line of described high pressure evaporator constant to guarantee evaporating pressure.
6. assembly as claimed in claim 1, wherein, described hot gas condenser comprises the sub-cooler construction with two sub-coolers.
7. assembly as claimed in claim 1, comprise be used for guaranteeing from the hot gas condenser provide enough sensible heats to dry air to reach the control device of predetermined air temperature.
8. assembly as claimed in claim 7, wherein, the refrigerant that flows to described condenser is regulated by three-way control valve.
9. assembly as claimed in claim 1 comprises being used for regulating the condenser of described air themperature by discharging superfluous heat from described air.
10. assembly as claimed in claim 9, wherein, described condenser is an air-cooled condenser.
11. assembly as claimed in claim 9, wherein, described condenser is available by the hot condenser of discharging heat that conducts of the cooling medium beyond the deacration, such as water-cooled condenser.
12. assembly as claimed in claim 1 comprises the bypass damper system that is used to regulate by the bypath air stream of assembly.
13. assembly as claimed in claim 12 comprises being used to regulate described bypass damper system to keep the control device of desirable air humidity.
14. assembly as claimed in claim 1 comprises the auxiliary heater of being convenient to additional sensible heat introducing, to satisfy the required higher temperature of described air.
15. assembly as claimed in claim 14 comprises the control device that is used for triggering as required described auxiliary heater.
16. assembly as claimed in claim 1, comprise and be installed in before the described evaporimeter and saver afterwards, be used for the described dry air of precooling before described dry air enters described evaporimeter, and before described dry air enters condenser the described dry air of preheating.
17. assembly as claimed in claim 16, wherein, described saver comprises two plate shape fin coiled pipes that are filled with refrigerant.
18. assembly as claimed in claim 16, wherein, described saver comprises small heat-exchanger or fin-tube heat exchanger.
19. assembly as claimed in claim 1, wherein, described compressor is a Scrawl compressor.
20. assembly as claimed in claim 1, wherein, the compression of vapor refrigerant is carried out with different compression methods by compressor, as centrifugal, repeatedly, rotation or screw compressor.
21. assembly as claimed in claim 1, wherein, described compressor can open, half airtight or complete airtight.
22. assembly as claimed in claim 1 comprises axis or centrifugal circulating fan, is used at the assembly inner circulating air, and is used for the air after regulating is discharged in the described conditioning chamber.
23. assembly as claimed in claim 1 comprises and is convenient to introduce the access to plant that fresh air mixes with air in the described assembly.
24. assembly as claimed in claim 23, wherein, described access to plant comprises can regulate the suction skylight structure.
25. a heat pump components comprises
Heat pump unit, it comprises that (i) comprises the high pressure that is used for air conditioning and two phase evaporation device systems of low pressure evaporator; (ii) be used for sensible heat is introduced the hot gas condenser of described air; (iii) compressor; And (iv) be used to receive from the air of described hot gas condenser and be convenient to keep latent heat load constant outer evaporimeter; And
Be suitable for from described heat pump unit receive after regulating air and with the hothouse of air re-circulation to the heat pump unit.
26. assembly as claimed in claim 25, wherein, described heat pump unit and described hothouse are separate, helping the expansion of described hothouse, and need not change described heat pump unit.
CN99815379A 1998-12-12 1999-12-06 Modular heat pump system for drying and air-conditioning Pending CN1369050A (en)

Priority Applications (4)

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SG98048127 1998-12-12
SG9804812A SG83109A1 (en) 1998-12-12 1998-12-12 Two stage heat pump dryer
SG9905175A SG83158A1 (en) 1998-12-12 1999-10-19 A modular heat pump system for drying and air-conditioning
SG99051757 1999-10-19

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AU (1) AU3095800A (en)
ID (1) ID30058A (en)
MY (1) MY124685A (en)
SG (1) SG83158A1 (en)
WO (1) WO2000036344A1 (en)

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CN106457132A (en) * 2014-05-09 2017-02-22 阿特拉斯·科普柯空气动力股份有限公司 Method and device for cool drying gas
CN107606727A (en) * 2017-08-21 2018-01-19 中华电信股份有限公司 The outer air cooling air-conditioning device of modular
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CN103438682A (en) * 2013-07-29 2013-12-11 宁波天海制冷设备有限公司 Heat pump drying equipment
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WO2000036344A1 (en) 2000-06-22
MY124685A (en) 2006-06-30
ID30058A (en) 2001-11-01
SG83158A1 (en) 2001-09-18

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