1. technical name

Heat pump jet enthalpy increasing rotor inverter compressor technology

2. scope of application

Heating heat pumps for residential and commercial buildings in low-temperature and cold areas in the north solve the problem of system heating attenuation under low ambient temperatures. The product capacity of a single unit can reach 16HP, but the refrigerant characteristics require that the ambient temperature be not lower than-30℃, otherwise the unit cannot operate normally.

3. technical content

3.1 technical principle

Technical Achievements Through the development of special compressors for heat pump heating, and the heat pump jet enthalpy increasing rotor inverter compressor relies on heat pump technology and jet enthalpy increasing technology to form a "R410A/R32+ jet enthalpy increasing + frequency conversion" technology model suitable for large-scale industrialization. The system structure principle of jet enthalpy increase is as follows: The liquid refrigerant coming out of the condenser (using side) is divided into two paths. The main path is the refrigerant loop and enters the economizer. After exchanging heat with the branch, it directly enters the evaporator (outdoor heat source side) through throttling. The auxiliary path is the air supply loop. After throttling, it exchanges heat with the main path in the economizer. The refrigerant flashes into a gaseous state, enters the compressor pump body through the auxiliary path, and mixes with the original refrigerant, which increases the mass flow of the refrigerant in the compressor and realizes the improvement of heating capacity.

Figure 1 System structure principle of jet enthalpy increase

3.2 main innovations

(1) A specially designed injection pipe structure adopts a middle plate injection path to realize alternating injection of upper and lower cylinders, increasing the heating capacity and heating efficiency of the system under low-temperature environmental conditions, and at the same time reducing the exhaust temperature of the refrigerant and improving reliability. Compared with ordinary compressors, the increase in air supply circuits makes the system and compressor structure more complex. Reliability is ensured by improving the materials of parts such as DLC blades, ductile iron crankshafts, and alloy pistons, and clearance is reduced through ultra-precision machining. Reduce oil circulation technology ensures performance.

(2) In order to meet the stringent requirements of 65 ° C water outlet in a low-temperature environment, the low-temperature heating rotary compressor is under a large pressure ratio load for a long time, and the shaft load is relatively severe. In order to meet the reliability requirements, important friction parts are treated. Special surface treatment. In order to meet the requirements of some commercial heating and hot water projects, large-size rotor-type compressors have been developed, adopting a multi-support structure to ensure the reliability and stability of the compressor's shafting at high speeds and high loads, and self-lubricating bearings and active oil supply to multiple support parts to ensure lubrication.

4. Energy conservation and greenhouse gas emission reduction effects

As the core power component of the heating unit, the rotary compressor is optimized by using jet enthalpy increasing technology. Under nominal heating conditions, the energy efficiency is improved by 12.8%, and the nominal heating energy efficiency of the system is above 2.1 on average. In theory, it can save raw coal consumption. More than 50% of the total. Taking a household of 100m2 in the north as an example at ambient temperature of-12℃, the average running time in heating season is 4 months, and the total consumption of coal is about 2t.(equivalent to 1.8t standard coal), energy efficiency above 2.1 under low temperature conditions, equivalent to 857kg standard coal, saving 943kg standard coal, reducing CO2 emissions by 2470kg; calculated by annual sales of 200,000 units, coal saving of 188,600 t/a, CO2 emission reduction of 494,000 t/a.

5. Technology demonstration

This technical achievement has been matched at many customers, with more than 1 million units installed. Taking a project in the north as an example, the unit equipped with this product was used for pilot operation in the north. In 2017, it operated stably for a heating season. The performance under nominal low-temperature conditions was 2.41, saving 1053kg of standard coal per unit of coal and reducing CO2 emissions. 2759kg/unit.

6. investment estimation

Compared with ordinary rotary compressors, new jet pipes have been added, and the structure of some parts has been updated. Equipment needs to be invested and renovated to meet the special requirements of heat pump heating compressors, such as renovation of eccentric fine grinding and polishing machines, renovation of assembly assembly lines, and improvement of enthalpy difference chamber system test equipment, etc.

Taking the investment and transformation of a heating compressor (large-scale) production line with a production capacity of 200,000 units per month as an example, the technical product has a life span of 10 years, the initial investment is 14 million yuan, and the operating cost of the production line is 8.5 million yuan per month.

7. investment recovery period

Taking the investment and transformation of a heating compressor production line with an output of 200,000 units as an example, the payback period is about 6 months.

8. Prospects for transformation and promotion of technological achievements

This technology is the world's first heat pump jet enthalpy increasing rotor inverter compressor. It has complete independent intellectual property rights and has applied for and obtained dozens of patents. Currently, heat pumps only account for about 1% of the market capacity of the heating industry, and even fewer rotary compressors that use jet enthalpy increase are used. As the country's energy conservation and emission reduction work continues to deepen, clean energy heating is the future development trend. The technical application of low-temperature heat pump products will develop steadily and there will be greater promotion space in the future.