CN102794206A - Environmental test equipment with large-capacity refrigeration system and control method for environment test equipment - Google Patents
Environmental test equipment with large-capacity refrigeration system and control method for environment test equipment Download PDFInfo
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- CN102794206A CN102794206A CN2011101382809A CN201110138280A CN102794206A CN 102794206 A CN102794206 A CN 102794206A CN 2011101382809 A CN2011101382809 A CN 2011101382809A CN 201110138280 A CN201110138280 A CN 201110138280A CN 102794206 A CN102794206 A CN 102794206A
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Abstract
The invention discloses environmental test equipment with a large-capacity refrigeration system and a control method for the environmental test equipment. The environmental test equipment comprises a test chamber, an air conditioner part which is connected with the test chamber and can control temperature, refrigeration loops which are connected with the air container part through pipings, and an electric instrument part which is in circuit connection with the test chamber, the air conditioner part, and the refrigeration loops; and each refrigeration loop comprises a high temperature side loop and a low temperature side loop which are connected with each other through a plate heat exchanger. A temperature controller sets the opening of an electronic expansion valve to control refrigeration capacity; and the flow of high temperature bypasses and the opening and the closing of hot gas bypasses can be selected according to the set temperature value and the opening of the electronic expansion valve. According to the environmental test equipment, the refrigeration loops, the high temperature bypasses and the hot gas bypasses can be reasonably controlled, and the reliability can be guaranteed.
Description
Technical field
The present invention relates to a kind of environmental test equipment and control method thereof with big capacity refrigeration system.
Background technology
Over the years, environmental test require increasingly high.Especially the maximization of testing equipment, the increase of temperature changing speed.In order to reach these requirements, use the instance of big capacity refrigerating circuit (refrigerating circuit that power 10Hp is above) to rise significantly in recent years.
Adopt big capacity refrigerating circuit, realized that the thermic load occurred frequently on the low-temperature test is handled, the rapid temperature of per minute 10 degree becomes, or the like requirement for height.
In the design of environmental test equipment, selected refrigerating circuit, the machine of heater or the like is all selected according to peak demand.Such as exacting terms is that the rapid temperature of per minute 10 degree becomes, and calculates the refrigerating capacity that needs and the selected refrigerating circuit that can performance needs ability by this condition.
But exacting terms is not necessarily carried out in client's test.With above-mentioned example, sometimes carry out per minute 10 degree, sometimes carry out the temperature change test of per minute 2 degree.If the refrigerating circuit of low capacity (such as power 10Hp once), original refrigerating capacity is also little.So refrigerating circuit is opened with certain ability (maximum capacity) always.If refrigerating capacity is crossed big talk, the heater of in air-conditioner, equipping is adjusted suitable device capability, just can.
But, big capacity refrigerating circuit, its ability is very big, if having only the usage of maximum capacity, when refrigerating capacity is excessive, very big heater capacity.Like this, consuming capacity is high too, and equipment has also produced such as maximization, and cost is too high, and is unrealistic, the problem of non-efficient.
In addition, the flow control methods of refrigerating circuit is a prior art.Such as, the capillary of several kinds of different flows of equipment switches the refrigerant circular flow, perhaps adopts the aperture of electric expansion valve or heating power expansion valve to control the refrigerant circular flow.
No matter how to control flow, all following problem can take place:
The not enough too high phenomenon that produces compressor discharge pipe temperature of cooling when A, hot operation.
Compressor frosting phenomenon when B, cold operation.
Compressor suction pressure when C, low discharge operation is crossed low phenomenon.
These problems directly influence the life-span of compressor.If continue the abnormal loop state of operation, the damage of compressor takes place easily, the very big expenses and the interruption of test take place.
There is following method to solve to these problems.
1, the too high phenomenon of compressor discharge pipe temperature
The bypass of equipment high temperature comes the refrigerant temperature of cooling compressor suction inlet.This is to expand into the refrigerating circuit low-pressure section of getting back to the evaporimeter back behind the suitable pressure to the on high-tension side liquid coolant of refrigerating circuit.Be exactly the part with refrigerating circuit circulation refrigerant, the refrigerant of compressor is got back in cooling.
If it is not enough that cooling just takes place the flow in this loop very little.If the liquid phenomenon also takes place back in flow too much.All be the phenomenon bad to compressor.For fear of these problems, the switching of several kinds of flows of general jumbo refrigerating circuit equipment or the flow-control of heating power expansion valve.
And the suitable flow of high temperature bypass is to the flow (aperture of electric expansion valve) of major loop, and test temperature all is correlated with.
2, compressor frosting phenomenon and compressor suction pressure are crossed low phenomenon
Jumbo refrigerating circuit generally is equipped with hot gas bypass circuit.This is directly to get back to compressor suction to the HTHP refrigerant handling capacity control valve that compressor comes out.The effect of ability force control valve is defrost compressor when guaranteeing necessarily above compressor suction pressure.
This loop equipment magnetic valve is opened when needing, and closes in the time of unwanted and controls.
More than explained, the control method of refrigerating capacity, and keep normal refrigerating circuit state, and the action of high temperature bypass and hot gas bypass circuit and effect, these all are prior aries.But these technology all are correlated with.
Be not used in the reasonable control method in these three movable loops at present.Can only adopt the usage that produces firm discharge, perhaps simply combine and carry out capacity variation and the control of protecting the loop.So can not bring into play the effective capacity of big capacity refrigerating circuit and the reliability that can not guarantee the loop.
Summary of the invention
The present invention provides a kind of environmental test equipment and control method thereof with big capacity refrigeration system, can reasonably control refrigerating circuit, and high temperature bypass and hot gas bypass circuit guarantee reliability.
In order to achieve the above object; The present invention provides a kind of environmental test equipment with big capacity refrigeration system; The air-conditioning part of the temperature controllable that this environmental test equipment comprises laboratory, be connected with laboratory, the some refrigerating circuits that partly are connected with air-conditioning through pipe arrangement, and the electric meter that circuit connects above-mentioned various piece is adorned part;
Described refrigerating circuit comprises high temperature side loop and the low temperature side loop that connects through plate type heat exchanger.
Described air-conditioner partly is provided with pressure fan, heater, evaporimeter.
Described electric meter dress part is provided with temperature sensor and the solid-state relay that temperature controller, circuit connect said temperature controller, and the solid-state relay circuit connects described heater.
Described high temperature side loop comprises high temperature side compressor, condenser, the expansion valve that pipeline connects.
Described low temperature side loop comprises low temperature side compressor, electric expansion valve, evaporimeter, high temperature bypass, the hot-gas bypass that pipeline connects.
Described high temperature bypass comprises first high-temperature solenoid valve, second high-temperature solenoid valve, the 3rd high-temperature solenoid valve, big capillary, middle capillary, the little capillary that pipeline connects.
Described hot-gas bypass comprises magnetic valve, the ability adjustment valve that pipeline connects.
A kind of control method with environmental test equipment of big capacity refrigeration system, this control method comprises following steps:
Step 2, temperature controller are set the aperture of electric expansion valve, control refrigerating capacity;
Step 3, according to temperature value and the electronic expansion valve opening set, select the flow of high temperature bypass and the keying of hot-gas bypass.
Described step 2 comprises following steps:
Step 2.1, selection control method, if select heater output quantity control method, then execution in step 2.2, if select running status and heater output quantity control method, then execution in step 2.3;
Step 2.2, utilize the heater output quantity to control the aperture of electric expansion valve;
Step 2.3, utilize running status and heater output quantity to control the aperture of electric expansion valve;
The scope of the once-through operation amount of the territory of the output quantity of heater and electric expansion valve changes;
According to temperature-constant operation or these two kinds of running statuses of change of temperature test, and the territory of the temperature value of setting and the temperature value measured output quantity of setting heater and the once-through operation amount of electric expansion valve.
Described step 2.2 comprises following steps:
The aperture of electric expansion valve is minimum when step 2.2.1, startup;
Step 2.2.2, temperature controller are set the territory of the output quantity of heater;
In heater output quantity 0-100%, set the UP field, KEEP field, DOWN field;
Step 2.2.3, temperature controller are set the once-through operation amount of electric expansion valve;
Step 2.2.4, according to the output quantity of heater, the time cycle that every thermal insulation degree controller is set, judge the operational ton of primary electron expansion valve; If the heater output quantity is in the UP field; Execution in step 2.2.5 then, if the heater output quantity is in the KEEP field, execution in step 2.2.6 then; If the heater output quantity is in the DOWN field, execution in step 2.2.7 then;
Step 2.2.5, judge whether electric expansion valve reaches maximum opening, if aperture is constant, if refrigerating circuit is arranged in addition, start second group of refrigerating circuit, if not, the aperture of electric expansion valve increases the once-through operation amount;
The aperture of step 2.2.6, electric expansion valve is constant;
Step 2.2.7, judge whether electric expansion valve reaches minimum aperture, if aperture is constant, if started a plurality of refrigerating circuits, close one group of refrigerating circuit, if not, the aperture of electric expansion valve reduces the once-through operation amount
The present invention can keep its normal operating condition in the effective capacity of the big capacity refrigerating circuit of performance, can guarantee the refrigerating circuit of high reliability.
Description of drawings
Fig. 1 is a kind of structural representation with environmental test equipment of big capacity refrigeration system provided by the invention;
Fig. 2 is the structural representation of the refrigerating circuit of a kind of environmental test equipment with big capacity refrigeration system provided by the invention;
Fig. 3 is electronic expansion valve controls figure;
Fig. 4 is electronic expansion valve controls figure;
Fig. 5 is the control chart of high temperature bypass and hot-gas bypass.
The specific embodiment
Following according to Fig. 1～Fig. 5, specify preferred embodiment of the present invention:
As shown in Figure 1; It is a kind of structural representation with environmental test equipment of big capacity refrigeration system; The air-conditioning part 120 of the temperature controllable that this environmental test equipment comprises laboratory 110, be connected with laboratory 110, the some refrigerating circuits 130 that are connected through pipe arrangement with air-conditioning part 120, and circuit connects the electric meter dress part 140 of above-mentioned various piece;
Described air-conditioner part 120 is provided with pressure fan 121, heater 122, evaporimeter 123;
Described electric meter dress part 140 is provided with temperature sensor 142 and the solid-state relay 143 that temperature controller 141, circuit connect said temperature controller 141, and solid-state relay 143 circuit connect described heater 122;
As shown in Figure 2, described refrigerating circuit 130 comprises the high temperature side loop 210 and low temperature side loop 220 that connects through plate type heat exchanger 214;
Described high temperature side loop 210 comprises high temperature side compressor 211, condenser 212, the expansion valve 213 that pipeline connects;
Described low temperature side loop 220 comprises low temperature side compressor 221, electric expansion valve 222, evaporimeter 123, high temperature bypass 230, the hot-gas bypass 240 that pipeline connects;
First high-temperature solenoid valve 231 that described high temperature bypass 230 comprises that pipeline connects, second high-temperature solenoid valve 232, the 3rd high-temperature solenoid valve 233, big capillary 234, middle capillary 235, little capillary 236;
Described hot-gas bypass 240 comprises magnetic valve 241, the ability adjustment valve 242 that pipeline connects.
Need big flow like high temperature bypass 230, first high-temperature solenoid valve 231 is opened, the words of flow in needing; Just second high-temperature solenoid valve 232 is opened, needed low discharge, just the 3rd high-temperature solenoid valve 233 is opened; Hot gas bypass circuit is opened if desired, just magnetic valve 241 is opened.
The present invention also provides a kind of control method with environmental test equipment of big capacity refrigeration system, comprises following steps:
Generally export the heater output quantity of 0-100% with PID control;
PID control is the general control theory of temperature controller.P: ratio, I: integration, D: differential.The ratio that differs with setting value and measured value is calculated, and integral and calculating, and present variations in temperature state comes differential calculation.
Step 2, temperature controller 141 are set the aperture of electric expansion valve 222, control refrigerating capacity;
Step 2.1, selection control method, if select heater output quantity control method, then execution in step 2.2, if select running status and heater output quantity control method, then execution in step 2.3;
Step 2.2, utilize the heater output quantity to control the aperture of electric expansion valve 222 (as shown in Figure 3);
The aperture of electric expansion valve 222 is minimum when step 2.2.1, startup;
Step 2.2.2, temperature controller 141 are set the territory of the output quantity of heater;
In heater output quantity 0-100%, set the UP field, KEEP field, DOWN field;
Such as, 0-20% is the UP field, and 20-80% is the KEEP field, and 80-100% is the DOWN field;
Described territory is that the power balance of usage, refrigerating circuit and heater according to testing equipment is set; It is unfavorable that the too big words province in UP field can go up; Too little words ability gathers way slowly, and the KEEP field is too little, the refrigerating capacity increase can take place reduce repeatedly problems such as phenomenon; So, set the scope that is fit to through the result of technique computes or equipment debugging;
Step 2.2.3, temperature controller 141 are set the once-through operation amount of electric expansion valve 222;
Such as, 1% of the total operational ton of electric expansion valve;
Step 2.2.4, according to the output quantity of heater, the time cycle (as 3 seconds) that every thermal insulation degree controller 141 is set, judge the operational ton of primary electron expansion valve 222; If the heater output quantity is in the UP field; Execution in step 2.2.5 then, if the heater output quantity is in the KEEP field, execution in step 2.2.6 then; If the heater output quantity is in the DOWN field, execution in step 2.2.7 then;
Step 2.2.5, judge whether electric expansion valve 222 reaches maximum opening, if aperture is constant, if refrigerating circuit is arranged in addition, start second group of refrigerating circuit, if not, the aperture of electric expansion valve 222 increases the once-through operation amount, as 1%;
The aperture of step 2.2.6, electric expansion valve 222 is constant;
Step 2.2.7, judge whether electric expansion valve 222 reaches minimum aperture, if aperture is constant, if started a plurality of refrigerating circuits, close one group of refrigerating circuit, if not, the aperture of electric expansion valve 222 reduces the once-through operation amount, as 1%;
Step 2.3, utilize running status and heater output quantity to control the aperture of electric expansion valve 222;
The scope of the once-through operation amount of the territory of the output quantity of heater and electric expansion valve 222 changes;
According to temperature-constant operation or these two kinds of running statuses of change of temperature test, and the territory of the temperature value of setting and the temperature value measured output quantity of setting heater and the once-through operation amount of electric expansion valve 222;
As shown in Figure 4, in the present embodiment, set five kinds of states, certainly, set several kinds of states according to the user mode of equipment;
The main operation of environmental test equipment is temperature-constant operation and variations in temperature operation, the difference of the speed that also changes in the variations in temperature;
Do not need responsive operation during constant temperature test, need bigger operational ton when warm speed change degree is big;
1, temperature-constant operation, and design temperature and measurement temperature differ in 10 degree time: consider to economize can, the little output quantity of trying one's best in stable condition;
0-20% is the UP field, and 20-30% is the KEEP field, and 30-100% is the DOWN field;
When the heater output quantity was 0-10%, the once-through operation amount of electric expansion valve 222 was 0.8%, when the heater output quantity is 10-20%; The once-through operation amount of electric expansion valve 222 is 0.4%, and when the heater output quantity was 20-30%, the once-through operation amount of electric expansion valve 222 was 0%; When the heater output quantity is 30-40%; The once-through operation amount of electric expansion valve 222 is 0.4%, and when the heater output quantity was 40-100%, the once-through operation amount of electric expansion valve 222 was 0.8%;
2, temperature-constant operation, and design temperature and measurement temperature differ 10 degree when above: increase the operational ton in each field, realize comparatively fast reaching design temperature;
0-20% is the UP field, and 20-30% is the KEEP field, and 30-100% is the DOWN field;
When the heater output quantity was 0-10%, the once-through operation amount of electric expansion valve 222 was 4%, when the heater output quantity is 10-20%; The once-through operation amount of electric expansion valve 222 is 2%, and when the heater output quantity was 20-30%, the once-through operation amount of electric expansion valve 222 was 0%; When the heater output quantity is 30-40%; The once-through operation amount of electric expansion valve 222 is 2%, and when the heater output quantity was 40-100%, the once-through operation amount of electric expansion valve 222 was 4%;
3, change of temperature test, and design temperature surpasses 20 degree: and change of temperature test needs responsive refrigerating capacity to change than constant temperature test, but the variable quantity in the high temperature field is not big especially;
0-30% is the UP field, and 30-70% is the KEEP field, and 70-100% is the DOWN field;
When the heater output quantity was 0-10%, the once-through operation amount of electric expansion valve 222 was 2%, when the heater output quantity is 10-20%; The once-through operation amount of electric expansion valve 222 is 1%, and when the heater output quantity was 20-30%, the once-through operation amount of electric expansion valve 222 was 5%; When the heater output quantity is 30-70%; The once-through operation amount of electric expansion valve 222 is 0%, and when the heater output quantity was 70-100%, the once-through operation amount of electric expansion valve 222 was 0.5%;
4, below change of temperature test and design temperature+20 are spent; And the temperature difference of design temperature and measurement temperature is in 1 degree: the variations in temperature that reaches low temperature needs the variation of responsive refrigerating capacity; But when soon reaching design temperature, operational ton diminishes a bit, prevents overshoot;
0-30% is the UP field, and 30-70% is the KEEP field, and 70-100% is the DOWN field;
When the heater output quantity was 0-10%, the once-through operation amount of electric expansion valve 222 was 3%, when the heater output quantity is 10-20%; The once-through operation amount of electric expansion valve 222 is 2%, and when the heater output quantity was 20-30%, the once-through operation amount of electric expansion valve 222 was 1%; When the heater output quantity is 30-70%; The once-through operation amount of electric expansion valve 222 is 0%, and when the heater output quantity was 70-100%, the once-through operation amount of electric expansion valve 222 was 1%;
5, below change of temperature test and design temperature+20 are spent, and the temperature difference of design temperature and measurement temperature surpasses 1 degree: need responsive refrigerating capacity variation, the operation quantitative change is big;
0-30% is the UP field, and 30-70% is the KEEP field, and 70-100% is the DOWN field;
When the heater output quantity was 0-10%, the once-through operation amount of electric expansion valve 222 was 5%, when the heater output quantity is 10-20%; The once-through operation amount of electric expansion valve 222 is 3%, and when the heater output quantity was 20-30%, the once-through operation amount of electric expansion valve 222 was 2%; When the heater output quantity is 30-70%; The once-through operation amount of electric expansion valve 222 is 0%, and when the heater output quantity was 70-100%, the once-through operation amount of electric expansion valve 222 was 2%;
Adopt the detailed control of such operational ton, can realize finer and smoother refrigerating capacity control;
Step 3, according to temperature value and electric expansion valve 222 apertures set, select the flow of high temperature bypass 230 and the keying of hot-gas bypass 240;
As shown in Figure 5, present embodiment is set five kinds of states:
1, design temperature high (10 degree-80 degree), big (flow the is big) field (40-100%) of electronic expansion valve opening:
The loop state that high temperature and flow are big, the refrigerant of getting back to compressor is the highest temperature, selects the high temperature bypass of maximum stream flow, opens first high-temperature solenoid valve 231;
2, temperature in the design temperature, the field of electronic expansion valve opening big (40-100%):
Can cool off the refrigerant temperature of getting back to compressor than state 1 little flow, so second high-temperature solenoid valve 232 is opened in the high temperature bypass of flow in selecting;
3, design temperature low temperature (50 degree-20 degree), the field of electronic expansion valve opening big (40-100%):
Can cool off the refrigerant temperature of getting back to compressor than state 2 little flows,, open the 3rd high-temperature solenoid valve 233 so select the high temperature bypass of low discharge;
4, design temperature high (10 degree-80 degree), the field of the aperture of electric expansion valve little (0-40%):
Though high temperature, the loop flow is little, so the high temperature bypass of flow in selecting; Open second high-temperature solenoid valve 232, still, the low phenomenon of mistake of compressor suction pressure as a child took place in the aperture of electric expansion valve easily; So open hot gas bypass circuit, open magnetic valve 241;
5, low temperature (50 degree, 10 degree) in the design temperature, the field of the aperture of electric expansion valve little (0-40%):
Temperature is lower, and flow is also little, so select the high temperature bypass of low discharge; Open the 3rd high-temperature solenoid valve 233, still, the low phenomenon of mistake of compressor suction pressure as a child took place in the aperture of electric expansion valve easily; So open hot gas bypass circuit, open magnetic valve 241;
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (10)
1. environmental test equipment with big capacity refrigeration system; It is characterized in that; The air-conditioning part (120) of the temperature controllable that this environmental test equipment comprises laboratory (110), be connected with laboratory (110), the some refrigerating circuits (130) that are connected through pipe arrangement with air-conditioning part (120), and the electric meter that circuit connects above-mentioned various piece is adorned partly (140);
Described refrigerating circuit (130) comprises high temperature side loop (210) and low temperature side loop (220) that connect through plate type heat exchanger (214).
2. the environmental test equipment with big capacity refrigeration system as claimed in claim 1 is characterized in that, described air-conditioner part (120) is provided with pressure fan (121), heater (122), evaporimeter (123).
3. the environmental test equipment with big capacity refrigeration system as claimed in claim 2; It is characterized in that; Described electric meter dress part (140) is provided with temperature sensor (142) and the solid-state relay (143) that temperature controller (141), circuit connect said temperature controller (141), and solid-state relay (143) circuit connects described heater (122).
4. the environmental test equipment with big capacity refrigeration system as claimed in claim 1 is characterized in that, described high temperature side loop (210) comprises high temperature side compressor (211), condenser (212), the expansion valve (213) that pipeline connects.
5. the environmental test equipment with big capacity refrigeration system as claimed in claim 1; It is characterized in that described low temperature side loop (220) comprises low temperature side compressor (221), electric expansion valve (222), evaporimeter (123), high temperature bypass (230), the hot-gas bypass (240) that pipeline connects.
6. the environmental test equipment with big capacity refrigeration system as claimed in claim 5; It is characterized in that described high temperature bypass (230) comprises first high-temperature solenoid valve (231), second high-temperature solenoid valve (232), the 3rd high-temperature solenoid valve (233), big capillary (234), middle capillary (235), the little capillary (236) that pipeline connects.
7. the environmental test equipment with big capacity refrigeration system as claimed in claim 5 is characterized in that, described hot-gas bypass (240) comprises magnetic valve (241), the ability adjustment valve (242) that pipeline connects.
8. the control method with environmental test equipment of big capacity refrigeration system is characterized in that, this control method comprises following steps:
Step 1, the temperature value that measures according to the predefined temperature value of temperature controller (141) and temperature controller (141); Temperature controller (141) calculates the heater output quantity; This heater output quantity is exported to solid-state relay (143), the output signal of solid-state relay (143) control heater (122);
Step 2, temperature controller (141) are set the aperture of electric expansion valve (222), control refrigerating capacity;
Step 3, according to temperature value and electric expansion valve (222) aperture set, select the flow of high temperature bypass (230) and the keying of hot-gas bypass (240).
9. the control method with environmental test equipment of big capacity refrigeration system as claimed in claim 8 is characterized in that, described step 2 comprises following steps:
Step 2.1, selection control method, if select heater output quantity control method, then execution in step 2.2, if select running status and heater output quantity control method, then execution in step 2.3;
Step 2.2, utilize the heater output quantity to control the aperture of electric expansion valve (222);
Step 2.3, utilize running status and heater output quantity to control the aperture of electric expansion valve (222);
The scope of the once-through operation amount of the territory of the output quantity of heater and electric expansion valve (222) changes;
According to temperature-constant operation or these two kinds of running statuses of change of temperature test, and the territory of the temperature value of setting and the temperature value measured output quantity of setting heater and the once-through operation amount of electric expansion valve (222).
10. the control method with environmental test equipment of big capacity refrigeration system as claimed in claim 9 is characterized in that, described step 2.2 comprises following steps:
The aperture of electric expansion valve (222) is minimum when step 2.2.1, startup;
Step 2.2.2, temperature controller (141) are set the territory of the output quantity of heater;
In heater output quantity 0-100%, set the UP field, KEEP field, DOWN field;
Step 2.2.3, temperature controller (141) are set the once-through operation amount of electric expansion valve (222);
Step 2.2.4, according to the output quantity of heater, the time cycle that every thermal insulation degree controller (141) is set, judge the operational ton of primary electron expansion valve (222); If the heater output quantity is in the UP field; Execution in step 2.2.5 then, if the heater output quantity is in the KEEP field, execution in step 2.2.6 then; If the heater output quantity is in the DOWN field, execution in step 2.2.7 then;
Step 2.2.5, judge whether electric expansion valve (222) reaches maximum opening, if aperture is constant, if refrigerating circuit is arranged in addition, start second group of refrigerating circuit, if not, the aperture of electric expansion valve 222 increases the once-through operation amount;
The aperture of step 2.2.6, electric expansion valve (222) is constant;
Step 2.2.7, judge whether electric expansion valve (222) reaches minimum aperture, if aperture is constant, if started a plurality of refrigerating circuits, close one group of refrigerating circuit, if not, the aperture of electric expansion valve (222) reduces the once-through operation amount.
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| CN112682990A (en) * | 2020-12-28 | 2021-04-20 | 江苏拓米洛环境试验设备有限公司 | Control method and system for environmental protection test equipment |
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| CN104654682A (en) * | 2013-11-21 | 2015-05-27 | 上海爱斯佩克环境设备有限公司 | Environmental testing apparatus |
| CN103706416A (en) * | 2013-12-27 | 2014-04-09 | 天津商业大学 | Thermostatic bath system |
| CN104567161A (en) * | 2014-12-29 | 2015-04-29 | 广东芬尼克兹节能设备有限公司 | Stable electronic expansion valve control method |
| CN104941707A (en) * | 2015-05-20 | 2015-09-30 | 东莞市科宝试验设备有限公司 | Refrigeration system applied to constant-temperature and constant-humidity test box |
| CN112682990A (en) * | 2020-12-28 | 2021-04-20 | 江苏拓米洛环境试验设备有限公司 | Control method and system for environmental protection test equipment |
| CN112682990B (en) * | 2020-12-28 | 2022-03-18 | 江苏拓米洛环境试验设备有限公司 | Control method and system for environmental protection test equipment |
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| CN102794206B (en) | 2014-09-03 |
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