针对热能与动力工程学科专业英语教学中存在的问题，本文结合实际教学中的经验，对所采用教学模式的教学目标、教学内容、教学方法进行了探讨。

According to the energy shortage and the development of heat pump heater,the experimental study was carried out on the performance of sewage source heat pump water heater with circulating heat function. Maintaining the evaporation side sewage inlet temperature,voltage,the condensation and evaporation side water flow constant,measuring and recording system parameters such as energy consumption of heating interval,the temperature difference of inlet and outlet water,the suction and discharge pressure e of the compressor,electric power,with the water tank temperature increased from 15 ℃ to 55 ℃. The results show that the average COP of system reaches 3. 73,which show that this type of heat pump water heater has better energy saving performance.

In this study, we study the water source heat pump and digital scroll compressor and experimentally in the multi-connected air-conditioning system. Variable performance is developed when the unit operates in refrigerating and heating mode. The maximum of refrigerating capacity is 36519.95W when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 32°C, at the same time the maximum of EER is 4.33 when inlet water temperature of the condenser is 20°C and dry-bulb temperature of indoor air is 27°C. The unit operates in heating mode, the maximum of heating capacity and EER is 33275.73W and 3.86 when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 20°C.

In this paper,the heat transfer and flow characteristics of semi-dimpled split fin are investigated by numerical simulation and the physical mechanism of heat transfer is analyzed by entransy dissipation principle.The computational results show that the heat transfer performance of semidimpled split fin can improve 24.06%～67.73%and the overall performance increases 7.55%～23.88% compared with the plain fin,which means that the enhanced heat transfer of semi-dimpled split fin is better than that of plain fin.By applying the entransy dissipation principle to analyze the fins, it's found that the equivalent thermal resistance of semi-dimpled split fin is smaller than that of plain fin,and the heat transfer irreversibility of semi-dimpled split fin is lower,so the heat transfer performance of semi-dimpled split fin is better.

Low pressure drop and high heat transfer coefficient are the mainly goals for any new fin shape design.The dimpled fin was presented,Numerical study investigation was applied to investigate the characteristic of air flow and heat transfer.In the meantime,the irreversibility of the convective heat transfer was analyzed based on the entransy dissipation concept.The computational results show the Nusselt numbers of dimpled fin is 26.21%39.53% higher than that of plain fin,while friction factors of dimpled fin is 16.62%27.04% higher than that of plain fin,in the meantime overall performance of dimpled fin is 16.54%32.56% higher than that of plain fin;these indicate the dimpled fin has excellent performance and the characteristic of high heat transfer and low pressure drop.By analysis of entransy dissipation can be seen that the equivalent thermal resistance in the dimple fins is less.Therefore,the irreversibility of heat transfer in the dimple fins decreased.

a novel type of compound system for heat pump water heater is put forward in this paper, the component and fundamentals are introduced, and the experimental research is developed under the different working conditions. The results show that the maximum value of total EER of system is 11.03, and the minimum is 4.25, the average value is 7.532 in compound mode. There are the dynamic change of COP and operation characteristics for refrigerating capacity, consumption power of the system, heating capacity and suction and discharge temperature and pressure, and their effect on the operation of system is discussed and analyzed.

In this paper the system of air-source heat pump water heater(ASHPWH) using R134A to get 75°C hot water is proposed. The experiments on the performance of ASHPWH are conducted in two typical conditions, one for 7°C dry bulb temperature and 6°C wet bulb temperature, the other for 20°C dry bulb temperature and 15°C wet bulb temperature. In addition the variations of the suction temperature, the exhaust temperature, the suction pressure, the exhaust pressure, the transient heat capacity, the input power and COPs with the changing of the hot water tank temperature are analyzed. The results show that 75°C hot water can be produced steadily and the COPs are 2.84 and 3.68 respectively in two different conditions, therefore the ASHPWH has good energy saving effect.

The prototype of dual-source heat pump water heater using air and water is assembled, and experimental research of performance is tested using air as heat source, respectively the ambient temperature is 7°C and 20°C; water temperature of the prototype using water as heat source is respectively 15°C, 30°C. the results showed that the dual-source heat pump utilizes water source in the summer, utilizes air source during intermediate seasons, running stable and energy-saving effect is obvious, Coefficient of performance could reach up to 5.58 with the minimal value approximately 3.21.

Water source heat pump and digital scroll compressor are used and experimentally studied in the multi-connected air-conditioning system in this paper, some helpful technology data are obtained improving the practical application and performance of water source multi-connected air-conditioning system with digital scroll compressor. The design of water source multi-connected air-conditioning system with digital scroll compressor is designed and setup. Experimental performance of water source multi-connected air-conditioning system with digital scroll compressor is studied in three main parts, the first one is the performance of system in part load, and the IPLV of system is 3.65; When the unit operates in 50% load, EER reaches up to 3.99. © Sila Science. All rights reserved.

A new type of air conditioning system with water-film was established. Its refrigerating performance was test when the temperature of the chilled water was 7°C, dry bulb temperature and wet bulb temperature of the indoor air are respectively 27°C and 19°C. Its heating performance was test when the temperature of hot water supply was 45°C, dry bulb temperature and wet bulb temperature of the indoor air are respectively 20°C and 15°C. The experimental result indicates that there not only existed heat convection in the water-film vaporizing conditioning system, but the latent heat of vaporization was tremendous. The characteristic of water film air conditioning system was self-cleaning which would result in better air quality and was easily to maintain. When air conditioners were equipped at different room at the same time, it costs less compared with other products, so it has evident advantages in some special situation in which the temperature was decreased and the humidity was enhanced. © Sila Science. All rights reserved.

In this paper，a high temperature heat-pump dryer and a corresponding semi-enclosed test drying room for using the dryer are built up respectively. While the average dry bulb of the external environment is 25°C and the relative humidity is 55%, the performance of the dryer is obtained when the dryer is running continuously for five hours. The results show that: the electromagnetic valve-capillary institution has an obvious effect on the lower the dryer exhaust temperature. It makes the suction temperature of compressor dropped 10 °C~15 °C, which can reduce the exhaust temperature and prevent compressor’s overheating. When the exhaust temperature keep at 100~110 °C, it can not only guarantee the temperature of wind coming from the dryer is high, but also can make sure the drying system’s long-term stable operation.

A new type of air source heat pump water heater system with scroll compressor through middle injection of economizer in the course of compression is put forward operating reliably long and efficiently in low temperature in this study. The experimental prototype is set up, System fundamentals and the operation modes are introduced, Experimental research on operation characteristics of the unit in three different operation conditions is done in the lab of enthalpy difference; Heating capacity and COP were 8.84 kW and 2.43, respectively under the condition of environmental temperature of which is -7 and -8oC, respectively for dry bulb temperature and wet bulb temperature. The result shows that the unit operates reliably long and that heating capacity and COP of the unit are improved in low temperature.

The operating performance of air heat pump water heater with static heating was tested based on air conditioning measurement platform.At ambient temperature of(20±1)℃with water tank temperature from 15 ℃ to 55 ℃,the system parameters such as suction pressure and suction temperature had no significant change.Discharge pressure,discharge temperature,compression ratio and compressor input power all rose.The average COP was about 4.76,and the system showed feasibility in energy saving.

Air conditioning and hot water compound system in which air-cooling heat exchanger is connected with heat recovery heat exchanger in series is studied, system fundamentals and five running modes including single refrigerating mode, single heating mode, hot water mode, refrigerating and hot water mode and heating and hot water mode are introduced, and experimental research is developed. Experimental research on operation characteristics of refrigerating capacity, heating capacity and suction and discharge temperature and pressure show that the unit operates reliably long in different operation conditions and that the variation of characteristics is within a reasonable range. Coefficient of performance of the system in refrigerating and hot water mode and in heating and hot water mode is highest with the minimal value approximately 3.2 when the temperature of water tank climbs up to 55°C, as the service efficiency of the unit is improved by recovering the condenser heat to heat hot water. The system is avoided to operate in the region of maximum power, and had better operate in the variable flow region of capillary and large air volume and small temperature difference region as much as possible.

R32 has good thermophysical properties and friendly environmental performance,which make it as a potential refrigerant to R410A.In this study,R32 was poured into a household air conditioning designed for using R410A.The test results show that the optimum charging quantity of R32 is about 30.4% of the original charging quantity of R410A,and the refrigeration capacity can increase 8.5% of the R22 system and the EER can increase by up to 7.1%.

Numerical simulation is very easy to produce false diffusion for convection-domainated problem,Streamline upwind Petrov-Galerkin method（SUPG）is applied in MLPG（Meshless Local Petrov-Galerkin） method to lessen the influence of the convection term.Two cases that have benchmark solutions（rotate flow problem and Brezzi problem） are used to validate the accuracy and efficiency of the present method.The results show that the method can effectively overcome the influence of false diffusion;and compared with other upwind scheme in the literature,the method have very good stability and computational precise.

A new type of water-water multi-functional system consisting of double four-way valve is studied. System fundamentals and the operation modes are introduced. Experimental research on operation characteristics of refrigerating capacity, heating capacity, suction and discharge temperature and pressure shows that the unit operates reliably long in different operation conditions, and that the variation of characteristics is within a reasonable range. Coefficient of performance of the unit in refrigerating and hot water mode is highest and EER reaches up to 5.2 with the minimal value approximately 4, as the service efficiency of the unit is improved by recovering the condenser heat to heat hot water.

In this paper, the meshless local Petrov–Galerkin (MLPG) method is extended to solve the incompressible fluid flow problems. The streamline upwind Petrov–Galerkin (SUPG) method is applied to overcome oscillations in convection-dominated problems, and the pressure-stabilizing Petrov–Galerkin (PSPG) method is applied to satisfy the so-called Babuška–Brezzi condition. The same stabilization parameter τ(τSUPG=τPSPG) is used in the present method. The circle domain of support, linear basis, and fourth-order spline weight function are applied to compute the shape function, and Bubnov–Galerkin method is applied to discretize the PDEs. The lid-driven cavity flow, backward facing step flow and natural convection in the square cavity are applied to validate the accuracy and feasibility of the present method. The results show that the stability of the present method is very good and convergent solutions can be obtained at high Reynolds number. The results of the present method are in good agreement with the classical results. It also seems that the present method (which is a truly meshless) is very promising in dealing with the convection- dominated problems.

The performance of double-source heat pump water heater in different season realizes the different functions is analyzed through experiment,and the questions which appeared to the system is answered.The research indicated that this double-source heat pump operating condition is good,the stable property is highly effective,it may enhanced the energy synthesis efficiency effectively,and raised the equipment utilization rate effectively.

An experiment is carried out on the R417a used in air resource heat pump water heater under different hot water temperature under 7℃ operating mode.The discharge pressure,power input and Coefficient of Performance(COP) of the R417a are analyzed compared to R22.The result shows that the discharge pressure,compressor power input is lower than the R22 when mixed working substance R417a,the thermal power is reliable being effected by the temperature of hot water,the cop of the R417a drops rapidly,but its average cop is slightly higher than the R22 system.