Due to the introduction and implementation of new standards and new specifications, the structure of the heat transfer elements inside the air preheater has undergone relatively large changes. The thermal calculation method of the rotary air preheater is based on the Soviet 1973“Standard Method for Thermal Calculation of Boiler Units” It has been impossible to directly establish the heat transfer formula. According to the actual operating conditions of the rotary air preheater, the boundary conditions of the calculated heat transfer model can be obtained, including: the inlet temperature and inlet flow rate of the flue gas and air of the preheater; the heat transfer element of the regenerator is repeated Rotation, there are continuous conditions of the temperature of the heat storage element heat transfer element between the different air flow sub-bins. And a method for solving discrete equations is proposed.

This work deals with the design of on-chip planar electromagnets that will be introduced into a microfluidic device as part of a DNA extraction system. Different geometries of planar electromagnets have been designed, fabricated and tested using SQUID, and a comparison between their magnetic fields is made. The magnetic fields generated by different electromagnets were also studied using both theoretical considerations and FEA (Finite Element Analysis) simulations. The analysis and results of SQUID measurements and magnetic field simulation related to the magnetic head-cell composite separation ability will also be presented.

The heat pump is an efficient energy-saving device that makes full use of low-grade heat energy. Heat can be transferred spontaneously from a high-temperature object to a low-temperature object, but it cannot spontaneously proceed in the opposite direction. The working principle of the heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It consumes only a small amount of reverse cycle energy and can obtain a large amount of heat supply, which can effectively use low-grade products that are difficult to apply. Finally, the purposes of saving energy are achieved. This article mainly relates to the patents of high-power heat pumps, compact heat pumps, and split heat pumps, this article discusses from three aspects: high power, split and compact heat pumps. In the hope that reflect the novelty, it mainly discusses the relevant patent documents in the past five years.

Abstract. this work used the improved Shan-Doolen model which is based on Shan-Chen model, Combined of non-equilibrium extrapolation boundary and fully developed boundary treatment, and finally established Two-phase flow model. Applying this model, we firstly simulated the separation of two phase immiscible flow and represented the separation process of different time, so as to verify the feasibility of the model. Then the numerical simulation of transient flow of power lawNewtonian two phase flow in the extended port was made to show the distribution density of different time. On this basis we clearly numerical analyse the whole process of change from the initial to the steady state so that we have a more clear understanding to the transient process of flow.