Mechanical analysis of key components and machine performance for the oil regeneration project compressor
Special scroll profiles among the functional general scroll profiles were chosen to make a study on the integrative performance of the scroll compressor. Based on such profiles, it was further researched for all factors working on the integrative performance of the scroll compressor and the analysis of gas power was made on the key components influencing the integrative performance and four basic parameters including height, spindle rotation, involute angle and radius parameter of base circle. It was analyzed that the relation of axial gas power, radial gas power tangential gas power, overturning torque and rotation torque of dynamic and static vortex plate by employing the Genetic Algorithms (GA) of MATLAB to obtain the restricted parameter range, and to conclude that there is a linear relationship among four basic parameters and the overall force. Instance calculation was conducted to prove the validity of the restricted range that compression ratio and volume utilization have been increased greatly after optimization, so as to avoid the blindness of parameter selection and consequently improve the integrative performance of the scroll compressor.
Summarization Analysis and Development Tendency of General Profiles for Scroll Compressor
The scroll compressor is an ingenious machine used for compressing air or refrigerant, which was originally invented in 1905 by Creux, and it was not until the 1970s that commercial interest in the idea was revived. By specifying not parameterizations of the curve, but instead the radius of curvature as a function of tangent direction and using the intrinsic equation of a planar curve, the design can be changed in a way that allows all relevant geometrical quantities to be calculated in closed analytical form. Study of scroll profiles theory at present mainly is aiming at the single profile and its ameliorate or parameter optimization, not aiming at the nature characteristic of the profiles-equation of scroll profiles itself. Summarization analysis of scroll profiles geometry theory and conjugation functional scroll profiles were given. Development tendency was aimed at the study of general theory of scroll profiles which was based on engagement of conjugate curve and variational containment of pockets. Using the theory of functional analysis, the unified general functional equation of scrolls can be formed, based on the integration of all available mathematical models of scrolls. And the unified general equation can represent any probable scrolls. The conjugation characteristics of scrolls general functional equation and compressed mechanization of medium can be studied. Taking ratio of energy and efficiency as evaluation index, heat behavior analysis as physical foundation, general functional extremal mathematical model of scrolls can be given. The general scroll profiles can be optimized and the optimization scroll profiles can be gained
High Performance Air-Water Heat Pump with Extended Application Range for Residential Heating
A new type of air-water heat pump has been developed with the aim to cover an extended application range in high temperature residential heating (for retrofitting existing oil or gas boilers in hydronic heating systems). The base heat output is about 10 kWth. Based on a commercial heat pump, the refrigerant cycle was modified with two main components: A hermetic scroll compressor with a specially designed vapor injection port and an internal “economizer” heat exchanger. Performance tests were carried out in the laboratory over a wide range of injection mass flow rates and at external conditions covering air temperatures down to -12°C. At A-7°C/W60°C an increase of heat output of 28% and a COP improvement of 15% compared to the tests without injection flow have been observed. The heat output at A2° C/W50°C (standard operating conditions without injection) and at A-12° C/W65°C (extreme heating point with injection) are about the same. Considering these promising results and with the aim to further improve the seasonal COP and the heat output curve, a second compressor prototype based on a different compressor model, is being tested in phase two of this project.