CN101532742A - Parallel type thermal differential evaporation cold (hot) water machine - Google Patents
Parallel type thermal differential evaporation cold (hot) water machine Download PDFInfo
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- CN101532742A CN101532742A CN200910111543A CN200910111543A CN101532742A CN 101532742 A CN101532742 A CN 101532742A CN 200910111543 A CN200910111543 A CN 200910111543A CN 200910111543 A CN200910111543 A CN 200910111543A CN 101532742 A CN101532742 A CN 101532742A
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Abstract
The invention relates to a parallel type thermal differential evaporation cold(hot) water machine, comprising a condenser, two or more than two compressors, an evaporator cold-water inlet pipe, an evaporator cold-water outlet pipe, a refrigerant pipe, evaporation units of the same number with compressors and throttle valves of the same number with compressors, wherein the throttle valves, the evaporator units, compressors are connected together in turn and with one condenser to form a circulation system; the evaporator units are connected together side by side along flow direction to form one evaporator, the cold-water outlet pipe of the former evaporator unit is connected with the cold-water inlet pipe of the post evaporator unit, thus a parallel evaporator is formed. The parallel type thermal differential evaporation cold (hot) water machine has features of energy saving, consume reduction, convenient maintenance.
Description
Technical field:
The present invention relates to a kind of parallel differential temperature evaporation cold (heat) water unit.
Background technology:
Existing idle call multimachine compression cold (heat) water unit owing to be subjected to the restriction of early stage design concept, all is designed to the single vapo(u)rization system of pressing of single evaporator to simplify its structure and to reduce cost.Its systematic schematic diagram as shown in Figure 3, its course of work is mainly (omitted accessory for sake of convenience and be example with the process of refrigerastion): cold-producing medium flashes to steam in evaporimeter, absorbs the latent heat of vaporization (having produced cold) during evaporation and the cold water temperature that coil pipe is outer reduces and produces low-temperature cold water.For the evaporation process (process of refrigerastion) in the evaporimeter can constantly be gone on, need constantly to replenish refrigerant liquid and drain the steam that is produced in the evaporimeter.The compressor of a plurality of parallel connections (inhaling steam ports and steam drain all is connected in parallel) siphons away refrigerant vapour and its compression has been become the refrigerant vapour of HTHP from evaporimeter; The refrigerant vapour of HTHP is discharged from the steam drain of compressor and is flowed to condenser along refrigerant pipe.In condenser, refrigerant vapour under high pressure is cooled and emits heat, and it is cooling for evaporator evaporation to have become refrigerant liquid again.Because evaporating temperature is directly proportional with evaporating pressure,, need with throttling arrangement refrigerant liquid throttling step-down with generation low pressure in order to obtain the required low evaporating temperature of cold water; Refrigerant liquid after the step-down is sweat cooling in the inflow evaporator again, has so just realized a kind of refrigeration cycle.As long as compressor does not quit work, this kind of refrigeration cycle will go on always.
The shortcoming of this cold (heat) water unit is: (1) though in the process of cold (heat) current pervaporation device water temperature be progressively descend (rising), but because refrigeration system has only an evaporimeter, thereby this evaporating pressure can only minimum by temperature (height) the decision of evaporator outlet water temperature, can't utilize the relatively-high temperature of front end in the cold water temperature-fall period in the kind of refrigeration cycle, according to refrigeration principle, evaporating temperature (pressure) is low more, and refrigerating efficiency is just low more; Represent that the equivalent Carnot cycle schematic diagram that concerns between its refrigerating efficiency and evaporating temperature sees Fig. 5; (2) since single evaporator cold (heat) water unit evaporating pressure when descending efficient reduce very soon, limited the utilization of low-temperature cold water and the big temperature difference (big unit cold water is imported and exported the temperature difference) technology.Improve supply backwater temperature difference and very big potentiality are arranged improving the air-conditioning system energy utilization efficiency, reducing cold water temperature water outlet degree has very big influence to the air-conditioning system wet-out property, and the raising of dehumidification rate also can significantly improve the energy utilization efficiency in the air-conditioning system air handling process; (3) in the process of refrigerastion, it is big that single evaporator cold water is imported and exported the temperature difference, and the outlet water temperature easily produces in the evaporimeter because of heat exchanging corner causes local overcooling and freezes near freezing point the time, damages unit.
Summary of the invention:
The object of the present invention is to provide a kind of energy-saving and cost-reducing parallel differential temperature evaporation cold (heat) water unit.
The present invention includes it and comprise condenser, the compressor more than two or two, evaporimeter cold water inlet, evaporimeter cold water outlet pipe, refrigerant pipe, it is characterized in that: it also comprise the evaporation element identical with number of compressors and with number of compressors identical choke valve, connect the back in regular turn by a plurality of choke valves, a plurality of evaporation element, a plurality of compressor and connect to form a circulatory system with a condenser; A plurality of evaporation elements are connected in series along water (flow) direction and are combined into evaporimeter, the cooling water outlet of previous evaporation element connects the cold water inlet of a back evaporation element, the formation that is connected in series so in regular turn combined-type evaporator, the evaporimeter cold water inlet is gone into from a side joint of evaporimeter, and evaporimeter cold water outlet pipe is derived from the opposite side of evaporimeter.
The present invention has following advantage: (1) is owing to be provided with independently evaporation element and evaporation element is arranged by the water (flow) direction order every compressor, the evaporation element two ends are not sealed, during unit operation in each evaporation element refrigerant liquid can under different pressure, evaporate.Evaporimeter is imported and exported water temperature and is had the temperature difference during unit operation, and the evaporating temperature of evaporation elements at different levels is progressively to descend rather than by the decision of evaporator outlet water temperature, thereby has improved the average evaporating temperature of unit, has improved the Energy Efficiency Ratio of unit.(2) can saferly produce the more cold water of low temperature more efficiently, slow down the efficient that causes because of unit cold (heat) water outlet temperature decline (or rising) and reduced, improve the comprehensive Energy Efficiency Ratio of unit.More the cold water low-temperature receiver of low temperature has higher dehumidification rate and bigger energy-saving potential in the air handling process of air-conditioning system.(3) can realize the big temperature difference more efficiently for backwater, and big temperature difference low-temperature receiver helps " branch matter " processing that central air conditioner system realizes air conditioner load efficiently, this is to be difficult in the former air-conditioning system realize.(4) evaporation element can be divided into limited several series by the evaporation capacity scope, the evaporation element of the different evaporation capacity of homologous series is taked standard interface, the evaporation element that different compressors is mated is thickness (length) difference, thereby can be combined into required evaporimeter arbitrarily easily; (5) packaged evaporator is more convenient for keeping in repair, and changes and inner the cleaning; (6) evaporimeter that is combined into by evaporation element helps the production of evaporimeter standardized stream waterline to reduce cost.
Description of drawings:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of the evaporimeter of evaporation element formation among the present invention.
Fig. 3 is the structural representation of present technology.
The equivalent Carnot cycle schematic diagram of Fig. 4 for concerning between refrigerating efficiency of the present invention and evaporating temperature.
The equivalent Carnot cycle schematic diagram of Fig. 5 for concerning between the refrigerating efficiency of prior art and evaporating temperature.
Label declaration: 1 compressor, 2 condensers, 3 choke valves; 4 evaporimeters; 5 evaporimeter cold water inlets, 6 evaporimeter cold water outlet pipes; 7 refrigerant pipes, 8 evaporation elements, 81 evaporation coils, 82 shells, 83 flanges, 9 evaporimeter end caps, 10, evaporimeter.
The specific embodiment:
As shown in Figure 1, the present invention includes condenser 2, two or more compressor 1, evaporimeter cold water inlet 5, evaporimeter cold water outlet pipe 6, refrigerant pipe 7, the evaporation element 8 identical and identical choke valve 3 with number of compressors with number of compressors, connect to form a unit in regular turn by a compressor and an evaporation element and a choke valve, being arranged in parallel between a plurality of unit back is connected in series with a condenser and forms a circulatory system.
A plurality of evaporation elements are connected in series along water (flow) direction and are combined into evaporimeter, and the cooling water outlet of previous evaporation element connects the cooling water inlet of a back evaporation element, so connect and compose the evaporimeter 8 of tandem compound in regular turn.Evaporimeter cold water inlet 5 is gone into from a side joint of evaporimeter, and evaporimeter cold water outlet pipe 6 is derived from the opposite side of evaporimeter.Because every compressor is provided with independent evaporation element, and evaporation element is arranged by the water (flow) direction order, the evaporation element two ends are not sealed, each modular evaporation can be carried out under different pressure during unit operation.Evaporimeter is imported and exported water temperature and is had the temperature difference during unit operation, and the evaporating temperature of evaporation elements at different levels is progressively to descend rather than by the decision of evaporator outlet water temperature, thereby has improved the average evaporating temperature of unit, has improved the Energy Efficiency Ratio of unit.Simultaneously can saferly produce the more cold water of low temperature more efficiently, slow down that the unit cold water outlet temperature descends (or rising) and the efficient that causes reduces, improve the comprehensive Energy Efficiency Ratio of unit.More the cold water low-temperature receiver of low temperature has higher dehumidification rate and bigger energy-saving potential in the air handling process of air-conditioning system.
As shown in Figure 2, evaporation element is divided into evaporation coil 81 and shell 82 two parts, and shell 82 is a tubular, is provided with evaporation coil 81 in the shell, and flange 83 is not sealed and is provided with at two ends, and the evaporimeter two ends are provided with evaporimeter end cap 9.By flange is set, evaporation element is connected in twos, and the evaporation element at evaporimeter two ends is linked to each other with the evaporimeter end cap.
Evaporation element is divided into limited several grades by the evaporation capacity scope, and the interface of the evaporation element of different brackets is identical.Because the evaporation element that different compressors is mated is thickness (length) difference, thereby tandem compound becomes required evaporimeter arbitrarily easily; Adopt combined-type evaporator to be more convenient for keeping in repair, to change and inner the cleaning; The evaporimeter of being made up of the evaporation element series connection helps the production of evaporimeter standardized stream waterline to reduce cost simultaneously.
Below in conjunction with Fig. 4 Fig. 5 the present invention and prior art are analyzed.
As shown in Figure 5, among the figure: W is the work done during compression that refrigeration consumed; TK is the condensation temperature of refrigerant vapour in the condenser; The evaporating temperature of cold-producing medium in the TO evaporimeter;
The evaporating temperature that is cold-producing medium in the evaporimeter is low more, area is big more, the work done during compression that refrigeration is consumed is also big more, has only an evaporimeter in the refrigeration system of prior art, thereby this evaporating temperature can only be by the minimum evaporator outlet water temperature decision of temperature, can't utilize the relatively-high temperature of front end in the cold water temperature-fall period in the kind of refrigeration cycle, so prior art exists weak point.
As shown in Figure 4, it is to have adopted the equivalent Carnot cycle schematic diagram that concerns between the refrigerating efficiency of 3 groups of compressors and evaporating temperature, among the figure: the work done during compression that W1 first compressor is consumed; The work done during compression that W2 second compressor is consumed; The work done during compression that W3 the 3rd compressor is consumed; Shaded area under W1, the W2 is the work done during compression that the present invention saved.
Because the water temperature in the exit of the 1st group of pairing evaporation element of compressor is higher, i.e. the evaporating temperature height of cold-producing medium is so the work done during compression that is consumed is less, the rest may be inferred, the water temperature in the exit of last group evaporation element is minimum, and the evaporating temperature of cold-producing medium is low, so the work done during compression maximum that is consumed.There is the temperature difference in evaporimeter import and export water temperature during unit operation, the evaporating temperature of evaporation elements at different levels is progressively to descend rather than determined by the evaporator outlet water temperature, thereby improved the average evaporating temperature of unit, and having improved the Energy Efficiency Ratio of unit, its equivalent Carnot cycle schematic diagram is seen Fig. 4.All be 40 ℃ in the supposition condensation temperature, evaporimeter final outflow water temperature all is 7 ℃, when evaporimeter import and export water temperature difference all is 5 ℃, each compressor is under the same model compressor prerequisite, as calculated, the present invention generally can improve refrigerating efficiency more than 5% than existing handpiece Water Chilling Units in theory, and the big more energy-saving effect of evaporimeter import and export water temperature difference is good more.
Claims (5)
1, a kind of parallel differential temperature evaporation cold (heat) water unit, it comprises condenser, two or more compressor, evaporimeter cold water inlet, evaporimeter cold water outlet pipe, refrigerant pipe, it is characterized in that: it also comprise the evaporation element identical with number of compressors and with number of compressors identical choke valve, connect the back in regular turn by a plurality of choke valves, a plurality of evaporation element, a plurality of compressor and connect to form a circulatory system with a condenser; A plurality of evaporation elements are connected in series along water (flow) direction and are combined into evaporimeter, the cooling water outlet pipe of previous evaporation element connects the cold water inlet of a back evaporation element, so connect and compose the evaporimeter of series connection in regular turn, the evaporimeter cold water inlet is gone into from a side joint of evaporimeter, and evaporimeter cold water outlet pipe is derived from the opposite side of evaporimeter.
2, parallel differential temperature evaporation cold (heat) water unit according to claim 1 is characterized in that: connect to form a unit in regular turn by a compressor and an evaporation element and a choke valve, be arranged in parallel between a plurality of unit.
3, parallel differential temperature evaporation cold (heat) water unit according to claim 2, it is characterized in that: described evaporation element is divided into evaporation coil and shell two parts, and shell is a tubular, is provided with evaporation coil in the shell, and flange is not sealed and is provided with at two ends.
4, parallel differential temperature evaporation cold (heat) water unit according to claim 3, it is characterized in that: described evaporimeter two ends are provided with the evaporimeter end cap.
5, parallel differential temperature evaporation cold (heat) water unit according to claim 4, it is characterized in that: described evaporation element is divided into limited several grades by the evaporation capacity scope, and the interface of the evaporation element of different brackets is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910111543A CN101532742A (en) | 2009-04-23 | 2009-04-23 | Parallel type thermal differential evaporation cold (hot) water machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910111543A CN101532742A (en) | 2009-04-23 | 2009-04-23 | Parallel type thermal differential evaporation cold (hot) water machine |
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| CN101532742A true CN101532742A (en) | 2009-09-16 |
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| CN200910111543A Pending CN101532742A (en) | 2009-04-23 | 2009-04-23 | Parallel type thermal differential evaporation cold (hot) water machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445016A (en) * | 2011-11-16 | 2012-05-09 | 广州市设计院 | Method for preparing large-temperature difference chilled water in single machine two-stage compression manner and special water chilling unit |
| CN102506511A (en) * | 2011-11-17 | 2012-06-20 | 广州市设计院 | Method and special water chilling unit for manufacturing chilled water with large temperature difference in stand-alone three-stage compression manner |
| CN103925752A (en) * | 2013-01-10 | 2014-07-16 | 海瑞弗机房设备(北京)有限公司 | Refrigeration device and refrigeration method |
| CN105004100B (en) * | 2015-07-21 | 2018-06-26 | 同济大学 | Vapor compression refrigeration/heat pump system of single refrigerant circuit, more pressures of inspiration(Pi) |
| CN112944757A (en) * | 2021-02-25 | 2021-06-11 | 宁波美科二氧化碳热泵技术有限公司 | Transcritical CO2Detection and maintenance method for heat pump unit group |
-
2009
- 2009-04-23 CN CN200910111543A patent/CN101532742A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445016A (en) * | 2011-11-16 | 2012-05-09 | 广州市设计院 | Method for preparing large-temperature difference chilled water in single machine two-stage compression manner and special water chilling unit |
| CN102506511A (en) * | 2011-11-17 | 2012-06-20 | 广州市设计院 | Method and special water chilling unit for manufacturing chilled water with large temperature difference in stand-alone three-stage compression manner |
| CN103925752A (en) * | 2013-01-10 | 2014-07-16 | 海瑞弗机房设备(北京)有限公司 | Refrigeration device and refrigeration method |
| CN103925752B (en) * | 2013-01-10 | 2016-04-20 | 海瑞弗机房设备(北京)有限公司 | Refrigerating plant and refrigerating method |
| CN105004100B (en) * | 2015-07-21 | 2018-06-26 | 同济大学 | Vapor compression refrigeration/heat pump system of single refrigerant circuit, more pressures of inspiration(Pi) |
| CN112944757A (en) * | 2021-02-25 | 2021-06-11 | 宁波美科二氧化碳热泵技术有限公司 | Transcritical CO2Detection and maintenance method for heat pump unit group |
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Open date: 20090916 |