control method for a low-temperature heat pump system is adopted, which includes the following steps: A. Turn on the compressor, and after the main circuit runs for t1 until the refrigerant operation within it is almost steady, run the jet enthalpy increase circuit; B. Judging the heating process Whether the exhaust temperature T row is greater than the preset maximum exhaust temperature T row max, if yes, go to step C, otherwise, go to step E; C. Inject the supercooled refrigerant liquid directly into the middle pressure cavity of the compressor to reduce the discharge Air temperature T row; D. Determine whether the exhaust temperature T row is greater than the preset maximum exhaust temperature T row max-the return difference value △T row of exhaust temperature drop, if yes, go to step C, otherwise, go to step E; , The system is heated to the set temperature and exits. The invention solves the problem that the existing low-temperature heat pump system cannot reach a stable state as soon as possible in the early stage of operation, and the refrigerant distribution of the main circuit and the injection circuit may be uneven, and the reliability of the compressor is improved.
| Spec. | DKFXRS-9I/CY | DKFXRS-11I/CY | DKFXRS-11II/CY | DKFXRS-16I/CY |
| Nominal heating at room temperature・(kW) | 9.6 | 10.9 | 10.8 | 16 |
| Nominal power consumption at room temperature(kW〕 | 2.17 | 2.63 | 2.7 | 3.9 |
| Low temperature heating(kW) | 4.1 | 4.65 | 4.8 | 7.8 |
| Low temperature power consumption(kW) | 1.85 | 2.1 | 2.16 | 3.37 |
| Maximum input power(kW) | 3 | 4.2 | 4.2 | 6.6 |
| Maximum current(A) | 16 | 23 | 8A | 32 |
| Power Spec.(Hz) | 220V-50 | 220V-50 | 380V3N-50 | 220V-50 |
| Refrigerant/charge amount | R22/2500g | R22/5600g | R22/5600g | R22/6000g |
| noisedb(A) | <55 | <62 | <62 | <65 |
| Water resistancekPa | <55 | <55 | <55 | <100 |
| Anti-shock level | I | I | I | I |
| waterproof level | IPX4 | IPX4 | IPX4 | IPX4 |
| Circulation port diameter | DN20 | DN32 | DN32 | DN32 |
| Unit size (mm) | 1010x350x835 | 1030x410x1390 | 1030x410x1390 | 1030x410x1390 |
| Unit Weight(kg) | 87 | 142 | 142 | 148 |
| Spec. | DKFXRS-16II/CY | DKFXRS-19II/CY | DKFXRS-38II/CY |
| Nominal heating at room temperature・(kW) | 16.4 | 17.4 | 38.9 |
| Nominal power consumption at room temperature(kW〕 | 4.1 | 4.6 | 8.82 |
| Low temperature heating(kW) | 7.5 | 8.5 | 17.6 |
| Low temperature power consumption(kW) | 3.4 | 3.68 | 7.3 |
| Maximum input power(kW) | 6.8 | 8.5 | 17 |
| Maximum current(A) | 12 | 15 | 30 |
| Power Spec.(Hz) | 380V 3N-50 | 380V3N-50 | 380V 3N-50 |
| Refrigerant/charge amount | R22/6000g | R22/6500g | R22/6500gx2 |
| noisedb(A) | <65 | <66 | <68 |
| Water resistancekPa | £100 | <65 | <65 |
| Anti-shock level | I | I | I |
| waterproof level | IPX4 | IPX4 | IPX4 |
| Circulation port diameter | DN32 | DN32 | DN40 |
| Unit size (mm) | 1030x410x1390 | 780x820x1700 | 1550x780x1700 |
| Unit Weight(kg) | 149 | 265 | 435 |
FAQ:
| Q1 | How about your delivery time ? |
| A1 | Generally, it will take 1 to 30 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order. |
| Q2 | What is your term of delivery ? |
| A2 | EXW, FOB, CIF, etc |
| Q3 | What is your terms of packing? |
| A3 | Generally, we pack the heat pump in brown cartons or plywood. If you have legally registered patent, we can pack the heat pump in your branded boxes after getting your authorization letters. |
| Q4 | What is your sample policy? |
| A4 | We accept the sample order, but the customers have to pay the sample cost and the courier cost. |
| Q5 | Do you test all your goods before delivery? |
| A5 | Yes, we have 100% test before we pack the goods for delivery |
| Q6 | How long is the guarantee time? |
| A6 | 2 years warranty on the whole unit. The spare parts must be non-humanly damaged, usually we give to customer 1% spare parts free of charge for maintenance according to order cost during the warranty period. |
