CN105042968A - Control method for high-efficiency operation of multi-compressor energy-step-utilization water-heating unit of water-to-water heat pump - Google Patents
Control method for high-efficiency operation of multi-compressor energy-step-utilization water-heating unit of water-to-water heat pump Download PDFInfo
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- CN105042968A CN105042968A CN201510320884.3A CN201510320884A CN105042968A CN 105042968 A CN105042968 A CN 105042968A CN 201510320884 A CN201510320884 A CN 201510320884A CN 105042968 A CN105042968 A CN 105042968A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
Abstract
The invention relates to a control method for high-efficiency operation of a multi-compressor energy-step-utilization water-heating unit of a water-to-water heat pump. The control method is characterized in that water temperatures of total inlet water and outlet water at a hot water side of the unit are set to be t1 and t2; inlet water and outlet water temperatures at the hot water side corresponding to each compressor are designed to be tn1 and tn2; n presents the tandem n-th compressor; the inlet and outlet water temperatures at the hot water side of the first compressor are t11 and t12; practical inlet and outlet water temperatures of the unit are t1 and t2; when the practical inlet water temperature t1 is lower than or equal to t12, all compressors are started; when the practical inlet water temperature t1 is greater than t12 but lower than or equal to t22, the first compressor is stopped, and only the (2-n)-th compressor is started; when the practical inlet water temperature t1 is greater than t22 but lower than or equal to t32, the first and the second compressors are stopped, and only the (3-n)-th compressor is started; when the practical inlet water temperature t1 is greater than t(n-1)2 but lower than or equal to t2, the n-th compressor is started, and when the water temperature changes with the range, load changes are matched by adding and subtracting through the unit; and when the inlet water temperature reaches (t2+1) DEG C, all compressors are spotted. The control method has the beneficial effects of enabling the unit to efficiently operate, saving energy resources, and the like.
Description
Technical field
The present invention relates to a kind of control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function.Belong to HVAC/plumbing technical field.
Background technology
At present, in the buildings such as hotel, hotel, hospital and school, there is domestic hot-water's demand, generally provide the mode of domestic hot-water to have air source heat pump system, boiler room system and hydrothermal pump system etc., wherein the highest with water-water heat pump Energy Efficiency Ratio.
In prior art, for hydrothermal pump system, its nucleus equipment is water-water heat pump Hot water units, and be energy cascade utilization, efficient water-water heat pump unit generally arranges multiple compressors, progressively to improve water temperature, and keeps unit efficiency.But in existing control method, when sub-load or inflow temperature change, be generally by simple unloading to unit (all unloading), the defect such as have that control procedure is rough, compressor efficiency is low, energy consumption of compressor is high and unit eer is low.
Therefore, in order to improve efficiency and the Energy Efficiency Ratio of unit, needing to propose a kind of new control method, making unit when sub-load, unit energy Effec-tive Function.
Summary of the invention
Object of the present invention, there is for solving existing control method the problem that control procedure is rough, compressor efficiency is low, energy consumption of compressor is high and unit eer is low, a kind of control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function is provided, has the advantages that to make unit Effec-tive Function, economize energy.
Object of the present invention can reach by taking following technical scheme:
The control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function, is characterized in that: setting a water-water heat pump Hot water units has n compressor, and the total Inlet and outlet water water temperature of unit hot water side is t
1and t
2, the hot water side design Inlet and outlet water temperature that every compressor is corresponding is t
n1and tn
2, n is the n-th compressor of series connection, and the 1st compressor hot water side turnover water temperature is t
11and t
12; The actual Inlet and outlet water temperature of unit is t
1and t
2;
1) as actual inflow temperature t
1≤ t
12time, open whole compressor, when water temperature changes within the scope of this, add the change of off-load matched load by unit;
2) as actual inflow temperature t
12< t
1≤ t
22time, stop First compressor, only open 2-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
3) as actual inflow temperature t
22< t
1≤ t
32time, stop First and the second compressor, only open 3-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
By that analogy
4) as actual inflow temperature t
(n-1) 2< t
1≤ t
2time, open the n-th compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
5) when inflow temperature reaches t
2when+1 DEG C, stop whole compressor.
Object of the present invention can reach by taking following technical scheme:
Further preferred version is, each high-temperature water hydro-thermal pump hot water machine group band 4 compressor, and design water inlet coolant-temperature gage is 15 DEG C, and leaving water temperature is 60 DEG C; The hot side inflow temperature that First compressor is corresponding is 15 DEG C, leaving water temperature is 28 DEG C, the hot side inflow temperature that second compressor is corresponding is 28 DEG C, leaving water temperature is 40 DEG C, the hot side inflow temperature that 3rd compressor is corresponding is 40 DEG C, leaving water temperature is 50 DEG C, and the hot side inflow temperature that the 4th compressor is corresponding is 50 DEG C, leaving water temperature is 60 DEG C;
1) as actual inflow temperature t
1when≤28 DEG C, open whole compressor, when temperature of intaking changes within the scope of 15 DEG C-28 DEG C, changed by the off-load matched load that adds of unit;
2) as actual inflow temperature 28 DEG C of < t
1when≤40 DEG C, open 2-4 compressor, when water temperature changes within the scope of 28 DEG C-40 DEG C, changed by the off-load matched load that adds of unit;
3) as actual inflow temperature 40 DEG C of < t
1when≤50 DEG C, open 3-4 compressor, when water temperature changes within the scope of 40 DEG C-50 DEG C, changed by the off-load matched load that adds of compressor;
4) as actual inflow temperature 50 DEG C of < t
1when≤60 DEG C, open the 4th compressor, when water temperature changes within the scope of 50 DEG C-60 DEG C, changed by the off-load matched load that adds of compressor;
5) when inflow temperature reaches 61 DEG C, stop whole compressor, unit is out of service.
Further preferred version is, the 1st) add the change of off-load matched load by unit described in point, refer to: unit inflow temperature is 15 DEG C, leaving water temperature is 60 DEG C, the water-in and water-out temperature difference is 45 DEG C; When water temperature is higher than 15 DEG C, total water-in and water-out temperature difference becomes and is less than 45 DEG C, and when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, and inflow temperature is higher, and unit unloading is more; Namely water temperature of intaking is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating; When water temperature is lower than 15 DEG C, required thermic load is greater than design heating load, the oepration at full load of compressor standard-sized sheet.
Further preferred version is, 2nd) being changed by the off-load matched load that adds of unit described in, refers to: the design water temperature that 2-4 compressor is corresponding is 28 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 32 DEG C, when water temperature of intaking is higher than 28 DEG C, total water-in and water-out temperature difference becomes and is less than 32 DEG C, and when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more.Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
Further preferred version is, 3rd) being changed by the off-load matched load that adds of unit described in, refers to: the design water temperature that 3-4 compressor is corresponding is 40 DEG C-60 DEG C, the design water-in and water-out temperature difference is 20 DEG C, when water temperature of intaking is higher than 40 DEG C, total water-in and water-out temperature difference becomes and is less than 15 DEG C, and when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more.Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
Further preferred version is, 4th) being changed by the off-load matched load that adds of unit described in, refers to: the design water temperature that the 4th compressor is corresponding is 50 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 10 DEG C, when water temperature of intaking is higher than 50 DEG C, total water-in and water-out temperature difference becomes and is less than 5 DEG C, and when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more; Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
Invention has following outstanding advantage and beneficial effect
The present invention is by analyzing the change of the inflow temperature of unit, the compressor number of units of priority acccess control unit operation, when unit number control does not meet the demands, carry out unit again and add Control of decreasing load, therefore, hinge structure is a kind of control method become more meticulous, this control method can make the good matched load change of unit, when inflow temperature raises, the number of units of compressor operating can be reduced, otherwise, the number of units of compressor operating is increased when inflow temperature reduces, with on the basis of guarantee coolant-temperature gage, improve the efficiency of compressor, save energy consumption of compressor and ensure unit eer.Therefore, solve existing control method and there is the problem that control procedure is rough, compressor efficiency is low, energy consumption of compressor is high and unit eer is low, there is the beneficial effects such as the feature making unit Effec-tive Function, economize energy.
Detailed description of the invention
Specific embodiment 1:
Certain high-temperature water hydro-thermal pump hot water machine group band 4 compressor, design Inlet and outlet water temperature is 15 DEG C and 60 DEG C.The hot side Inlet and outlet water temperature that First compressor is corresponding is 15 DEG C and 28 DEG C, the hot side Inlet and outlet water temperature that second compressor is corresponding is 28 DEG C and 40 DEG C, the hot side Inlet and outlet water temperature that 3rd compressor is corresponding is 40 DEG C and 50 DEG C, and the hot side Inlet and outlet water temperature that the 4th compressor is corresponding is 50 DEG C and 60 DEG C;
Concrete control method is:
1) as actual inflow temperature t
1when≤28 DEG C, open whole compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit; Such as: under design conditions, inflow temperature is 15 DEG C, and the Inlet and outlet water temperature difference is 45 DEG C; When water temperature is higher than 15 DEG C, as water temperature 20 DEG C, it is 40 DEG C that total supply backwater temperature difference diminishes, when flow is constant, required thermic load diminishes, and now unit unloading, if helical-lobe compressor is by regulating slide valve, unit operation at part load, inflow temperature is higher, and unit unloading is more; Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating; When water temperature is lower than 15 DEG C, now required thermic load is greater than design heating load, the oepration at full load of compressor standard-sized sheet;
2) as actual inflow temperature 28 DEG C of < t
1when≤40 DEG C, open 2-4 compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit; Such as: the design water temperature that 2-4 compressor is corresponding is 28 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 32 DEG C, when water temperature of intaking is higher than 28 DEG C, as 32 DEG C, it is 28 DEG C that total supply backwater temperature difference diminishes, when flow is constant, required thermic load diminishes, now unit unloading, if helical-lobe compressor is by regulating slide valve, unit operation at part load, inflow temperature is higher, and unit unloading is more; Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating;
3) as actual inflow temperature 40 DEG C of < t
1when≤50 DEG C, open 3-4 compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of compressor; Such as: the design water temperature that 3-4 compressor is corresponding is 40 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 20 DEG C, when water temperature of intaking is higher than 40 DEG C, as 45 DEG C, it is 15 DEG C that total supply backwater temperature difference diminishes, when flow is constant, required thermic load diminishes, and now unit unloading, if helical-lobe compressor is by regulating slide valve, unit operation at part load, inflow temperature is higher, and unit unloading is more, and water inlet water temperature is compared with eve time water temperature, water temperature height then unloads, water temperature low then unit load operating;
4) as actual inflow temperature 50 DEG C of < t
1when≤60 DEG C, open the 4th compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of compressor; Such as: the design water temperature that the 4th compressor is corresponding is 50 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 10 DEG C, when water temperature of intaking is higher than 50 DEG C, as 55 DEG C, it is 5 DEG C that total supply backwater temperature difference diminishes, when flow is constant, required thermic load diminishes, now unit unloading, if helical-lobe compressor is by regulating slide valve, unit operation at part load, inflow temperature is higher, and unit unloading is more; Water inlet water temperature is compared with the water temperature of eve, and water temperature height then unloads, water temperature low then unit load operating.
5) when inflow temperature reaches 61 DEG C, stop whole compressor, unit is out of service.
Other specific embodiments:
The feature of other specific embodiments of the present invention is: setting a water-water heat pump Hot water units has n compressor, and the total Inlet and outlet water water temperature of unit hot water side is t
1and t
2, the hot water side design Inlet and outlet water temperature that every compressor is corresponding is t
n1and tn
2, n is the n-th compressor of series connection, and the 1st compressor hot water side turnover water temperature is t
11and t
12; The actual Inlet and outlet water temperature of unit is t
1and t
2; N is the constant of 2-10;
1) as actual inflow temperature t
1≤ t
12time, open whole compressor, when water temperature changes within the scope of this, add the change of off-load matched load by unit;
2) as actual inflow temperature t
12< t
1≤ t
22time, stop First compressor, only open 2-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
3) as actual inflow temperature t
22< t
1≤ t
32time, stop First and the second compressor, only open 3-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
By that analogy
4) as actual inflow temperature t
(n-1) 2< t
1≤ t
2time, open the n-th compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
5) when inflow temperature reaches t
2when+1 DEG C, stop whole compressor.
All the other are with specific embodiment 1.
The above is explained in detail the preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept, all in the scope of protection of the invention.
Claims (6)
1. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function, is characterized in that: setting a water-water heat pump Hot water units has n compressor, and the total Inlet and outlet water water temperature of unit hot water side is t
1and t
2, the hot water side design Inlet and outlet water temperature that every compressor is corresponding is t
n1and tn
2, n is the n-th compressor of series connection, and the 1st compressor hot water side turnover water temperature is t
11and t
12; The actual Inlet and outlet water temperature of unit is t
1and t
2;
1) as actual inflow temperature t
1≤ t
12time, open whole compressor, when water temperature changes within the scope of this, add the change of off-load matched load by unit;
2) as actual inflow temperature t
12< t
1≤ t
22time, stop First compressor, only open 2-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
3) as actual inflow temperature t
22< t
1≤ t
32time, stop First and the second compressor, only open 3-n compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
By that analogy
4) as actual inflow temperature t
(n-1) 2< t
1≤ t
2time, open the n-th compressor, when water temperature changes within the scope of this, changed by the off-load matched load that adds of unit;
5) when inflow temperature reaches t
2when+1 DEG C, stop whole compressor.
2. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function according to claim 1, it is characterized in that: each high-temperature water hydro-thermal pump hot water machine group band 4 compressor, design water inlet coolant-temperature gage is 15 DEG C, and leaving water temperature is 60 DEG C; The hot side inflow temperature that First compressor is corresponding is 15 DEG C, leaving water temperature is 28 DEG C, the hot side inflow temperature that second compressor is corresponding is 28 DEG C, leaving water temperature is 40 DEG C, the hot side inflow temperature that 3rd compressor is corresponding is 40 DEG C, leaving water temperature is 50 DEG C, and the hot side inflow temperature that the 4th compressor is corresponding is 50 DEG C, leaving water temperature is 60 DEG C;
1) as actual inflow temperature t
1when≤28 DEG C, open whole compressor, when temperature of intaking changes within the scope of 15 DEG C-28 DEG C, changed by the off-load matched load that adds of unit;
2) as actual inflow temperature 28 DEG C of < t
1when≤40 DEG C, open 2-4 compressor, when water temperature changes within the scope of 28 DEG C-40 DEG C, changed by the off-load matched load that adds of unit;
3) as actual inflow temperature 40 DEG C of < t
1when≤50 DEG C, open 3-4 compressor, when water temperature changes within the scope of 40 DEG C-50 DEG C, changed by the off-load matched load that adds of compressor;
4) as actual inflow temperature 50 DEG C of < t
1when≤60 DEG C, open the 4th compressor, when water temperature changes within the scope of 50 DEG C-60 DEG C, changed by the off-load matched load that adds of compressor;
5) when inflow temperature reaches 61 DEG C, stop whole compressor, unit is out of service.
3. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function according to claim 2, it is characterized in that: being changed by the off-load matched load that adds of unit the 1st), refer to: unit inflow temperature is 15 DEG C, leaving water temperature is 60 DEG C, and the water-in and water-out temperature difference is 45 DEG C; When water temperature is higher than 15 DEG C, total water-in and water-out temperature difference becomes and is less than 45 DEG C, and when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, and inflow temperature is higher, and unit unloading is more; Namely water temperature of intaking is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating; When water temperature is lower than 15 DEG C, required thermic load is greater than design heating load, the oepration at full load of compressor standard-sized sheet.
4. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function according to claim 2, it is characterized in that: being changed by the off-load matched load that adds of unit the 2nd), refer to: the design water temperature that 2-4 compressor is corresponding is 28 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 32 DEG C, when water temperature of intaking is higher than 28 DEG C, total water-in and water-out temperature difference becomes and is less than 32 DEG C, when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more.Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
5. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function according to claim 2, it is characterized in that: being changed by the off-load matched load that adds of unit the 3rd), refer to: the design water temperature that 3-4 compressor is corresponding is 40 DEG C-60 DEG C, the design water-in and water-out temperature difference is 20 DEG C, when water temperature of intaking is higher than 40 DEG C, total water-in and water-out temperature difference becomes and is less than 15 DEG C, when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more.Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
6. the control method of multi-compressor energy cascade utilization water-water heat pump Hot water units Effec-tive Function according to claim 2, it is characterized in that: being changed by the off-load matched load that adds of unit the 4th), refer to: the design water temperature that the 4th compressor is corresponding is 50 DEG C-60 DEG C, the design Inlet and outlet water temperature difference is 10 DEG C, when water temperature of intaking is higher than 50 DEG C, total water-in and water-out temperature difference becomes and is less than 5 DEG C, when flow is constant, required thermic load diminishes, now unit unloading, unit operation at part load, inflow temperature is higher, and unit unloading is more.Water inlet water temperature is compared with eve time water temperature, and water temperature height then unloads, water temperature low then unit load operating.
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| CN114484935B (en) * | 2021-12-31 | 2023-09-26 | 青岛海尔空调电子有限公司 | Heat pump unit and control method and control device thereof |
| CN114440355A (en) * | 2022-01-25 | 2022-05-06 | 广东美的暖通设备有限公司 | Heat recovery indirect evaporative cooling device and heat recovery method |
| WO2023142980A1 (en) * | 2022-01-25 | 2023-08-03 | 广东美的暖通设备有限公司 | Indirect evaporative cooling device having function of heat recovery, and heat recovery method |
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