Based on the method for ring temperature and pressure ratio controlled cooling model water system in refrigeration station systemTechnical field
What the present invention relates to is integrated refrigeration station control field, is specifically related to the method based on ring temperature and pressure ratio controlled cooling model water system in a kind of refrigeration station system.
Background technology
Buildings in general causes air conditioner load to change along with seasonal variations, and winter, thermic load was generally little than refrigeration duty in summer, and air-conditioner water system supply backwater temperature difference generally gets 5 DEG C summer, gets 10 DEG C winter.Need refrigerating operaton at transition season or winter, now cooling water temperature is on the low side, if do not carry out control can produce lower pressure ratio, thus causes cold in refrigeration station system normally to start.
In the prior art, the mode of compressor raising pressure ratio adopts bypass mode to control the flow of water-cooling system usually; Or directly employing manually or empirical data carries out controlled cooling model tower and quantity opened by cooling water pump, and subjectivity accounting is comparatively large, cannot realize Automated condtrol.And this kind to control lower control accuracy poor, water system hysteresis quality greatly, causes cold difficulty in starting, even cannot normally run.
Summary of the invention
According to the deficiencies in the prior art, the invention provides a kind of by judging the mode that combines of compressor pressure ratio in environment temperature and control refrigerator system, the method for controlled cooling model water system, thus realize refrigeration station system and run fast.
Technical scheme of the present invention is: based on the method for ring temperature and pressure ratio controlled cooling model water system in a kind of refrigeration station system, concrete steps are as follows:
1) ambient wet bulb temperature outside monitoring refrigeration station unit compares with design temperature, when environment temperature is greater than design temperature, carry out step 2); When environment temperature is less than or equal to design temperature, the flow of cooling water is adjusted to the metered flow of 0.6 times, proceeds step 3);
2) the comparing of monitoring of environmental wet-bulb temperature and design temperature, when environment temperature is more than or equal to design temperature, the flow of cooling water is adjusted to metered flow, continues 5-8 second, proceed step 4); When environment temperature is less than design temperature, the flow of cooling water is adjusted to (0.6-1.0) metered flow doubly, continues 5-8 second, proceed step 3);
3) whether the temperature of monitoring condenser water inlet is less than design temperature, when the temperature of condenser water inlet is less than design temperature, opens cooling tower one-level fan; When the temperature of condenser water inlet is more than or equal to design temperature, open cooling tower secondary fan;
4) monitoring chilled water and cooling water actual measurement pressure reduction continue to be greater than 45%-50% normal flow pressure reduction more than 15 seconds, then start main frame;
5) type of compressor is judged, when type of compressor is magnetic suspension centrifugal compressor, judge the operation pressure ratio of compressor and the size setting pressure ratio, when running pressure ratio and being greater than setting pressure ratio, after cooling tower leaving water temperature desired value being set to 26 DEG C by centralized control system, re-start step 1); When running pressure ratio and being not more than setting pressure ratio, then handpiece Water Chilling Units in refrigeration station system is loaded amplitude and adjust to 10% to end of run; When type of compressor is not for magnetic suspension centrifugal compressor, the operation pressure reduction of monitoring handpiece Water Chilling Units, when running pressure reduction and being greater than setting pressure reduction, after cooling tower leaving water temperature desired value being set to 26 DEG C by centralized control system, re-starts step 1); When running pressure ratio and being not more than setting pressure reduction, then handpiece Water Chilling Units in refrigeration station system is loaded amplitude and adjust to 10% to end of run.
Preferred version is as follows:
Step 1) in design temperature be 22 DEG C.
Step 2) in design temperature be 28 DEG C.
Step 3) in design temperature be 25 DEG C.
Step 5) in setting pressure ratio be 1.4.
Step 5) in setting pressure reduction be 0.3MPa.
The present invention by the logic control of full frequency conversion refrigeration station system, thus realizes the logic control of cooling water system, and energy-saving effect is fairly obvious, and automaticity is high, is suitable for commercial introduction and uses.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Detailed description of the invention
Below in conjunction with Fig. 1, the present embodiment is described in further detail, but the present invention is not limited to specific embodiment.
Embodiment 1:
Based on a method for ring temperature and pressure ratio controlled cooling model water system in refrigeration station system, concrete steps are as follows:
1) monitor ambient wet bulb temperature outside refrigeration station unit and 22 DEG C compare, when environment temperature is greater than 22 DEG C, carry out step 2); When environment temperature is less than or equal to 22 DEG C, the flow of cooling water is adjusted to the metered flow of 0.6 times, proceeds step 3);
2) monitoring of environmental wet-bulb temperature and 28 DEG C compare, when environment temperature is more than or equal to 28 DEG C, the flow of cooling water is adjusted to metered flow, continues 5 seconds, proceed step 4); When environment temperature is less than 28 DEG C, the flow of cooling water is adjusted to (0.6-1.0) metered flow doubly, continues 5 seconds, proceed step 3);
3) whether the temperature of monitoring condenser water inlet is less than 25 DEG C, when the temperature of condenser water inlet is less than 25 DEG C, opens cooling tower one-level fan; When the temperature of condenser water inlet is more than or equal to 25 DEG C, open cooling tower secondary fan;
4) monitoring chilled water and cooling water actual measurement pressure reduction continue to be greater than 45% normal flow pressure reduction more than 15 seconds, then start main frame;
5) type of compressor is judged, when type of compressor is magnetic suspension centrifugal compressor, judge the operation pressure ratio of compressor and the size of 1.4, when running pressure ratio and being greater than 1.4, after cooling tower leaving water temperature desired value being set to 26 DEG C by centralized control system, re-start step 1); When running pressure ratio and being not more than 1.4, then handpiece Water Chilling Units in refrigeration station system is loaded amplitude and adjust to 10% to end of run; When type of compressor is not for magnetic suspension centrifugal compressor, the operation pressure reduction of monitoring handpiece Water Chilling Units, when running pressure reduction and being greater than 0.3MPa, after cooling tower leaving water temperature desired value being set to 26 DEG C by centralized control system, re-starts step 1); When running pressure ratio and being not more than 0.3MPa, then handpiece Water Chilling Units in refrigeration station system is loaded amplitude and adjust to 10% to end of run.
The present invention by the logic control of full frequency conversion refrigeration station system, thus realizes the logic control of cooling water system, and energy-saving effect is fairly obvious, and automaticity is high, is suitable for commercial introduction and uses.