CN201407781Y - Central air-conditioning waste heat recovery system utilizing dual-conversion thermostatic control technology - Google Patents

Central air-conditioning waste heat recovery system utilizing dual-conversion thermostatic control technology Download PDF

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CN201407781Y
CN201407781Y CN2009200558756U CN200920055875U CN201407781Y CN 201407781 Y CN201407781 Y CN 201407781Y CN 2009200558756 U CN2009200558756 U CN 2009200558756U CN 200920055875 U CN200920055875 U CN 200920055875U CN 201407781 Y CN201407781 Y CN 201407781Y
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heat recovery
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cooling
central air
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覃希
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Abstract

The utility model provides a central air-conditioning waste heat recovery system utilizing dual-conversion thermostatic control technology, which comprises a water chiller compressor, a condenser, a cooling water system and a waste heat recovery system, wherein a heat recovery heat exchanger is installed in series connection at the front of the condenser, a temperature sensor is arranged on a pipeat a water outlet end of the heat recovery heat exchanger, a water level sensor for monitoring water level inside a heat preservation water tank is disposed inside the heat preservation water tank ofthe waste heat recovery system, and a temperature sensor is mounted inside a cooling water system loop formed by a frequency conversion cooling water pump and a cooling tower. The central air-conditioning waste heat recovery system utilizing dual-conversion thermostatic control technology can recycle waste heat and prepare hot water, simultaneously lead the cooling water system to run in a constant temperature manner, achieve the purpose of leading water temperature of hot water, water temperature of cooling water and condensing pressure to be stable, improve the refrigerating efficiency of central air-conditioning water chillers, reduce energy consumption, decrease thermal pollution, and be of great significance to energy conservation and environmental protection.

Description

Use the central air-conditioning residual neat recovering system of two frequency conversion thermostatic control technology
Technical field
The utility model belongs to the energy-conserving and environment-protective field, relates in particular to the waste heat recirculation system of central air-conditioning.
Background technology
Along with high speed development of national economy,, have higher requirement to resources effective utilization and energy-saving and environmental protection.In Eleventh Five-Year Plan, country clearly proposes to reduce by 20% to the energy resource consumption of per GDP, and main disposal of pollutants total amount reduces by 10% target and requirement.
This shows that energy-saving and emission-reduction, protection environment have been mentioned the height of fundamental state policy, this is not only the requirement of national economy sustainable development, also brings huge economic benefit and good social benefit to enterprise simultaneously, is the behave of benefiting the nation and the people.
Along with China's reform and opening to the outside world and economic development, the area of China's commercial building increases day by day, built up about luxurious hotel of building more than 40000 and office building according to statistics at present, 10000 Duo Jia megastore are provided with about 4,500,000,000 square metres of the construction area of central air conditioner system.According to the energy consumption investigation statistics of commercial building, the energy consumption cost in commercial building every year that is provided with air-conditioning system is near 150 yuan/square metre, and the energy consumption cost in existing commercial building every year amounts to just up to 22,500,000,000 yuans.
And on the other hand, China's energy utilization rate is lower, and more than 10 percentage point will hang down in the industrial country of still emulating the advanced at present, and unit gross national product energy consumption is emulated the advanced national high 6~10 times, and the energy loss-rate of production unit product exceeds 50%~100% abroad.The poor efficiency of the energy is used economic construction and the development that not only has influence on China, also has influence on the environment that we depend on for existence.Central air conditioner system must be based on the basis of Utilizing Energy Sources in Reason and effectively conservation measures as one of main energy using technology.
And conventional central air conditioner system mainly is made up of cold-producing medium circulation, cooling water circulation, chilled water circulation and air circulation.In the cold-producing medium circulation, the cold-producing medium heat absorption flashes to the cold-producing medium of gaseous state, is compacted into high temperature, gases at high pressure in compressor; The gaseous refrigerant of HTHP enters the water cooling that is cooled in the condenser by blast pipe, is reduced into highly pressurised liquid; By the choke valve decompression, high-pressure refrigerant becomes the gas-liquid mixture that low pressure contains a small amount of gas; Thereafter, cold-producing medium level pressure (low pressure) in evaporimeter absorbs the heat of chilled water in a large amount of evaporimeters down, and evaporation becomes the gaseous refrigerant of low pressure; Gaseous refrigerant returns in the compressor by suction line again, so constantly circulation.In the cooling water circulation, cooling water has absorbed the heat of cold-producing medium in condenser after, deliver to by cooling water pump under the top spray of cooling tower, the air that rises with adverse current carries out the wet exchange of heat, cooling water temperature reduces, cooling water delivers to condenser by cooling water pump again and cold-producing medium carries out heat exchange, and temperature raises, so circulation.The refrigeration duty of air-conditioned room (being heat) enters the cold-producing medium circulation by evaporimeter, and the evaporation heat of cold-producing medium enters the cooling water circulation by condenser again, is discharged in the atmosphere and goes.Heat is in a handling process, evaporation heat=condenser heat (being Q evaporation=Q condensation).
Therefore, for the conventional air-conditioning refrigeration machine, it mainly acts on is air conditioning, and the condensation heat of air-conditioning system directly is discharged in the atmosphere and is not used.When refrigeration unit was moved under air conditioning condition, to a large amount of condensation heat of atmospheric environment discharging, common condensation heat can reach 1.15~1.3 times of refrigerating capacity.A large amount of condensation heat directly enters atmosphere, loses in vain, causes bigger energy waste, and distributing and ambient temperature being raise of these heats causes the serious environmental thermal pollution, produces tropical island effect.
In sum,, be used for heating domestic hot-water and production technology hot water, not only can reduce the condensation heat pollution on the environment, but also be a kind of power-economizing method of turning waste into wealth if the condensation heat that refrigeration machine is emitted is reclaimed.
Based on above-mentioned starting point, present central air-conditioning condensation heat extraction heat recovery system, be by central air conditioner cold water unit is provided with, heat recovery heat exchanger of series connection (is exactly to be equivalent to increase a condenser in fact before conventional condenser, heat carrying this moment equation becomes: Q evaporation=Q condensation+Q reclaims), the high temperature refrigerant that compressor is discharged is before cooling off by conventional condenser, carry out waste heat recovery and prepare hot water, it has not only obtained free hot water, also reduced the thermal pollution that is disposed to atmosphere by cooling tower, reduce the generation of tropical island effect, good energy conservation and environmental protection benefit arranged!
Yet, conventional central air-conditioning waste heat recovery mode is between heat recovery heat exchanger and recuperation of heat water tank, utilizes pipeline to be connected with water pump, with the water pump heating that constantly circulates, water in the water tank is heated up gradually, until reaching required water temperature (55--60 ℃) in the cycle heat exchange process.Comparatively serious defective and problem below this circulating central air-conditioning waste heat recovery mode exists inevitably:
(1), in the cycle heat exchange process of recuperation of heat, the heating that will constantly circulate of the water temperature of recuperation of heat water tank just can reach required water temperature, and can not reach needed water temperature at any time;
(2), circulating recuperation of heat makes the variation of constantly rising of the water temperature of water tank, water temperature is among the dynamic change all the time, promptly water temperature is a variable, make the water temperature instability, and in use need water tank is replenished running water, cause water temperature to descend again, the water temperature instability is made troubles to use;
(3), since in the cycle heat exchange process of recuperation of heat circulating water temperature constantly rise, the temperature difference between circulating water temperature and compressor exhaust temperature reduces, feasible (Q recovery) condenser heat diminishes.It is big that (Q condensation) condenser heat then becomes thus, causes coolant water temperature also constantly to rise and change, and causes condensing pressure to change, and the result is the operating condition instability, and is influential to the normal operation of handpiece Water Chilling Units.
Summary of the invention
For solving the technical problem that background technology proposed, the utility model proposes a kind of central air-conditioning residual neat recovering system of using two frequency conversion thermostatic control technology, it is a kind of system integration technology of implementing energy-saving and emission-reduction in central air conditioner system.
For achieving the above object, the utility model is achieved by the following technical programs: the structure of using the central air-conditioning residual neat recovering system of two frequency conversion thermostatic control technology is made of cooling load, refrigerating water pump, handpiece Water Chilling Units compressor, condenser, cooling water system, residual neat recovering system.Wherein the cooling load is connected with the handpiece Water Chilling Units compressor by refrigerating water pump, handpiece Water Chilling Units compressor and condenser join, condenser connects cooling water system, the heat recovery heat exchanger of described condenser and residual neat recovering system is in series, the pipeline place is provided with temperature sensor in the heat recovery heat exchanger water side, transfer to data handling unit (DHU) assembly by temperature sensor collecting temperature information content, then doing contrast with the set water temperature parameter differentiates, by the rotating speed and the flow of variable-frequency governor control heat-exchanger pump, make the water temperature of heat recovery heat exchanger water side reach the temperature of setting.Described residual neat recovering system also comprises frequency conversion heat-exchanger pump, cold water storage cistern, air source water heater group of joining with heat recovery heat exchanger and the thermal isolation and heat storage water tank that is attached thereto, and the level sensor of water level situation in the monitoring thermal isolation and heat storage water tank is housed in the wherein said thermal isolation and heat storage water tank.
Further technical measures are that above-mentioned cooling water system mainly is made up of frequency conversion cooling water pump and cooling tower, is provided with temperature sensor in the loop of cooling water system.As the hot water amount who utilizes waste heat recovery to produce during, need stop waste heat recovery greater than required hot water amount.At this moment, Q reclaims=0, and heat energy carrying equation becomes: Q evaporation=Q condensation.Evaporation heat is all discharged by cooling water system by condenser, and the water temperature of cooling water rises, and causes the condensing pressure instability.And this moment, by being arranged at the temperature sensor in the cooling water system loop, the collecting temperature information content transfers to data handling unit (DHU) assembly, then doing contrast with the set water temperature parameter differentiates, by the rotating speed and the flow of variable-frequency governor control cooling water pump, make the water temperature of cooling water backwater end reach the temperature of setting.
Compared with prior art, central air-conditioning residual neat recovering system of the present utility model, adopt two frequency conversion thermostatic control technology, make central air-conditioning when recovery used heat freely prepares the constant temperature high-temperature-hot-water, make cooling water system also can be in the temperature-constant operation of setting, promptly realize hot water water temperature stability, cooling water water temperature stability and the stable purpose of condensing pressure simultaneously; And owing to be in energy-conservation operating mode operation, operating condition is good, can also improve the refrigerating efficiency of central air-conditioning handpiece Water Chilling Units, prolongs the service life of air-conditioning system equipment, improves operational efficiency, cuts down the consumption of energy, reduces thermal pollution, and the energy-conserving and environment-protective meaning is remarkable.Particularly, have following substantive distinguishing features and marked improvement:
1, breaks through and solved current central air-conditioning waste heat recovery circulation heating and produce in the hot water process, need the circulation heating cause hot water temperature's problem of unstable, substitute former circular heating formula by the directly-heated thermostatic type.
2, break through and solved current central air-conditioning waste heat recovery circulation heating and produce in the hot water process, the water temperature instability causes air conditioner cold water unit operation condensing pressure problem of unstable, substitutes the control that heats up of former power frequency by the frequency conversion thermostatic control.
3, break through and solved current central air-conditioning waste heat recovery circulation heating and produce in the hot water process, recuperation of heat, cooling water system onrelevant independent operating cause cooling water system water temperature problem of unstable, by alternative former onrelevant independent operating system of two frequency conversion thermostatic control coordinated operation system.
Therefore, the utility model innovative technology is that the essence change has taken place the mode that makes original traditional central air-conditioning waste heat recovery produce hot water, but widespread adoption in the hotel, hospital, school, factory and the place that need freeze simultaneously and prepare hot water, practical, market prospects are wide.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the utility model central air-conditioning residual neat recovering system.
Among the figure: 1, cooling load, 2, refrigerating water pump, 3, the handpiece Water Chilling Units compressor, 4, temperature sensor, 5, condenser, 6, cooling water system, 601, frequency conversion cooling water pump, 602, cooling tower, 7, residual neat recovering system, 701, heat recovery heat exchanger, 702, the frequency conversion heat-exchanger pump, 703, feed pipe, 704, cold water storage cistern, 705, the air source water heater group, 706, the thermal isolation and heat storage water tank, 707, temperature sensor, 708, level sensor.
The specific embodiment
With reference to shown in Figure 1, should use the central air-conditioning residual neat recovering system of two frequency conversion thermostatic control technology, its composition comprises cooling load 1, refrigerating water pump 2, handpiece Water Chilling Units compressor 3, condenser 5, cooling water system 6, residual neat recovering system 7, cooling load 1 links to each other with handpiece Water Chilling Units compressor 3 through refrigerating water pump 2, handpiece Water Chilling Units compressor 3 joins with condenser 5, condenser 5 connects cooling water system 6, residual neat recovering system 7 is by heat recovery heat exchanger 701, frequency conversion heat-exchanger pump 702, feed pipe 703, cold water storage cistern 704, air source water heater group 705, thermal isolation and heat storage water tank 706 constitutes, before condenser 5, be in series with a heat recovery heat exchanger 701, the pipeline place is provided with temperature sensor 707 in the water side of heat recovery heat exchanger 701, by transferring to data handling unit (DHU) assembly after the collecting temperature information content, compare differentiation with the water temperature parameter of setting then, according to this differentiation object command Frequency Drive system desired value is followed the tracks of again and approach until reaching desired value; Level sensor 708 is housed in the thermal isolation and heat storage water tank 706, and this level sensor 708 is used to monitor the water level situation in the thermal isolation and heat storage water tank.Cooling water system 6 mainly is made up of frequency conversion cooling water pump 601 and cooling tower 602, is provided with temperature sensor 4 in the loop of cooling water system 6.
Should use the central air-conditioning residual neat recovering system of two frequency conversion thermostatic control technology, by frequency conversion heat-exchanger pump 702 cold water is transported to handpiece Water Chilling Units compressor 3, arrive heat recovery heat exchanger 701 again, cold water is after heat exchanger and condenser 5 carry out heat exchange, the water temperature (as 55 ℃) of the water temperature of output for setting directly enters thermal isolation and heat storage water tank 706 for using.Concrete operation implementation procedure and operation principle are as follows:
1. adopt two frequency conversion directly-heated thermostatic type heat recovery technologies:, make handpiece Water Chilling Units compressor 3 high temperature condense thermal energy of discharging and the current that pass through carry out the heat exchange of fullest by the discharge of control inflow heat recovery heat exchanger 701.Under the certain situation of heat, discharge and water temperature are inversely proportional to.That is: discharge is big more, and water temperature is just low more; Otherwise discharge is more little, and then water temperature is high more.
2. two frequency conversion directly-heated thermostatic type heat recovery water temperature control: by one temperature sensor 707 being set at the water side of heat recovery heat exchanger 701 pipeline, the temperature information amount that temperature sensor is collected is transferred to the micro processor system, compare differentiation with the water temperature parameter of setting (as being set at 55 ℃), the micro processor system is according to the contrast discrimination result, instruct the Frequency Drive system then, desired value followed the tracks of approach, until reaching desired value (i.e. setting value).
3. thermal isolation and heat storage water tank 706 water levels control: level sensor 708 is housed in thermal isolation and heat storage water tank 706, when the hot water of thermal isolation and heat storage water tank 706 is filled, level sensor 708 is transferred to data handling unit (DHU) assembly with the high water level signal, instruction frequency conversion heat-exchanger pump 702 is out of service, thereby stops to carry out recuperation of heat.When the hot water in the water tank dropped to low water level, level sensor 708 was transferred to data handling unit (DHU) assembly with the low water level signal, and instruction frequency conversion heat-exchanger pump 702 starts, and carries out recuperation of heat.
4. when carrying out recuperation of heat, the condenser heat part that handpiece Water Chilling Units compressor 3 is discharged is exchanged in the domestic hot-water by heat recovery heat exchanger 701; And other partial condensation heat will enter and cools off in the cooling water system 6, because cooling water system 6 also is provided with temperature sensor 4, make the flow of frequency conversion cooling water pump 601 can control by the water temperature and the closed circuit temperature difference that circulates of the chilled(cooling) water return (CWR) of setting equally.When the water temperature of chilled(cooling) water return (CWR) is higher than setting value (as 33 ℃), frequency conversion cooling water pump 601 meeting speed-raising augmented flows; Otherwise can slow down, to reduce flow.
5. when stopping recuperation of heat, the condenser heat that handpiece Water Chilling Units compressor 3 is discharged enters cooling water system 6 fully.At this moment, place the temperature sensor 4 in cooling water system 6 loops that the water temperature information content is transferred to data handling unit (DHU) assembly, data handling unit (DHU) assembly compares differentiation with information content and setting value (as 33 ℃), instruction Frequency Drive system, follow the tracks of the target setting value, make the handpiece Water Chilling Units cooling water temperature be in good working condition.
6. the recuperation of heat of two frequency conversion directly-heated thermostatic type, making the water that enters heat recovery heat exchanger is cold water all the time, and water temperature is constant, and having avoided circulating water temperature constantly to raise influences the changing situation of the operating mode of handpiece Water Chilling Units compressor 3, is beneficial to the operation of handpiece Water Chilling Units more.
Present technique is by heat recovery heat exchanger 701 of series connection before the condenser 5 of routine, make caloric value carrying equation become: Q evaporation=Q condensation+Q reclaims, the high temperature refrigerant that compressor is discharged is before cooling off by conventional condenser 5, carry out waste heat recovery and prepare hot water, the condenser 5 of heat recovery heat exchanger 701 with routine united two into one, by directly-heated thermostatic type temperature control technology, both controlled the leaving water temperature of heat recovery water, the water outlet water temperature can free adjustment be set in the scope between 50-60 ℃, control the condensing pressure of handpiece Water Chilling Units again, also adapted to the regulatory demand of recuperation of heat load and cooling heat dissipation load simultaneously.
The utility model technology is produced hot water by using two frequency conversion thermostatic control central air-conditioning heat recovery technology systems instead, use under the situation of clean energy resource at the cancellation boiler, can directly cut down the consumption of energy more than 70%, boiler waste gas reaches zero-emission simultaneously, air conditioning cooling water thermal pollution discharging reduces more than 30%, has huge economic benefit and social benefit.
Above content is in conjunction with further describing that concrete main embodiment is done, and can not assert that concrete enforcement of the present utility model is confined to these explanations.Those skilled in the art are not breaking away under the prerequisite of the utility model design, some other technology of done accurately, the deduction or replace that beautify, all should belong to protection domain of the present utility model.

Claims (2)

1, a kind of central air-conditioning residual neat recovering system of using two frequency conversion thermostatic control technology, comprise the cooling load, refrigerating water pump, the handpiece Water Chilling Units compressor, condenser, cooling water system and residual neat recovering system, described cooling load is connected with the handpiece Water Chilling Units compressor by refrigerating water pump, handpiece Water Chilling Units compressor and condenser join, condenser connects cooling water system, it is characterized in that: the heat recovery heat exchanger of described condenser and residual neat recovering system is in series, after being provided with by the collecting temperature information content, pipeline place, heat recovery heat exchanger water side transfers to data handling unit (DHU) assembly, then make the temperature sensor that contrast is differentiated with the set water temperature parameter, described residual neat recovering system also comprises the frequency conversion heat-exchanger pump that joins with heat recovery heat exchanger, by cold water storage cistern, air source water heater group and the thermal isolation and heat storage water tank that is attached thereto are equipped with the level sensor of monitoring water level situation in the thermal isolation and heat storage water tank in the wherein said thermal isolation and heat storage water tank.
2, the central air-conditioning residual neat recovering system of the two frequency conversion thermostatic control technology of application according to claim 1, it is characterized in that: described cooling water system comprises frequency conversion cooling water pump and cooling tower at least, is provided with temperature sensor in the loop of cooling water system.
CN2009200558756U 2009-05-04 2009-05-04 Central air-conditioning waste heat recovery system utilizing dual-conversion thermostatic control technology Expired - Fee Related CN201407781Y (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102549268A (en) * 2009-12-02 2012-07-04 阿特拉斯·科普柯空气动力股份有限公司 Method for controlling a compossed device and compossed device wherein such method is applied
CN106123259A (en) * 2016-06-27 2016-11-16 曾毅 A kind of utilizing heat energy of air conditioner retracting device
CN106969528A (en) * 2017-03-23 2017-07-21 深圳普鲁士特空压系统有限公司 A kind of the heat recovery circulatory system and its method
CN108375150A (en) * 2018-04-26 2018-08-07 郑州云海信息技术有限公司 A kind of air-conditioning system
CN110486871A (en) * 2019-07-31 2019-11-22 河南中烟工业有限责任公司 A kind of residual neat recovering system of central air-conditioning
CN113790487A (en) * 2021-09-09 2021-12-14 珠海格力电器股份有限公司 Heat recovery unit and control method thereof
CN113899037A (en) * 2021-09-30 2022-01-07 珠海格力电器股份有限公司 Heat recovery system and control method thereof
WO2024051125A1 (en) * 2022-09-06 2024-03-14 江苏科技大学 Leveling device and method having auxiliary heating function

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102549268A (en) * 2009-12-02 2012-07-04 阿特拉斯·科普柯空气动力股份有限公司 Method for controlling a compossed device and compossed device wherein such method is applied
CN102549268B (en) * 2009-12-02 2014-11-12 阿特拉斯·科普柯空气动力股份有限公司 Method for controlling a compossed device and compossed device wherein such method is applied
US9016072B2 (en) 2009-12-02 2015-04-28 Atlas Copco Airpower N.V. Method for controlling a composite device and a composite device in which the method can be applied
CN106123259A (en) * 2016-06-27 2016-11-16 曾毅 A kind of utilizing heat energy of air conditioner retracting device
CN106969528A (en) * 2017-03-23 2017-07-21 深圳普鲁士特空压系统有限公司 A kind of the heat recovery circulatory system and its method
CN108375150A (en) * 2018-04-26 2018-08-07 郑州云海信息技术有限公司 A kind of air-conditioning system
CN108375150B (en) * 2018-04-26 2024-04-16 郑州云海信息技术有限公司 Air conditioning system
CN110486871A (en) * 2019-07-31 2019-11-22 河南中烟工业有限责任公司 A kind of residual neat recovering system of central air-conditioning
CN113790487A (en) * 2021-09-09 2021-12-14 珠海格力电器股份有限公司 Heat recovery unit and control method thereof
CN113899037A (en) * 2021-09-30 2022-01-07 珠海格力电器股份有限公司 Heat recovery system and control method thereof
WO2024051125A1 (en) * 2022-09-06 2024-03-14 江苏科技大学 Leveling device and method having auxiliary heating function

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