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Refrigeration heat expansion valve superheat control characteristic application and research

  At present the domestic refrigerator the refrigeration systems generally use the refrigerant vapor compression cycle, which plays a vital role in the throttling element - thermostatic expansion valve characteristics of a lack of interest, leading to many domestic counterparts on the thermal expansion valve of the rational and efficient allocation of lack of understanding of the thermal expansion valve, the energy saving effect of lack of awareness.

  In fact, a thermostatic expansion valve in a refrigeration system, in addition to the refrigerant from the high pressure through a throttle is converted to a low pressure, realize the refrigeration effect, there is a very important automatic flow control function, this function optimization in a refrigerant that runs across the ice ( cooling ) process, maintain the evaporation of the refrigerant in the evaporator absorbs heat process to be fully utilized, so as to achieve the most economical, the most effective refrigeration efficiency, achieve our real purpose of saving energy, we in the refrigerator cooling capacity matching selection of expansion valve at the same time, the work of superheat control requirements must not be ignored.

  As we all know, thermostatic expansion valve and automatic regulation of air flow through the evaporator outlet superheat control, the degree of superheat of evaporator size can directly reflect the evaporation area utilization rate, if a thermal expansion valve in operation can make the superheat degree of small, said evaporation area and high utilization rate, namely high refrigeration efficiency, if the overheating degree even to zero, so the evaporation area utilization rate reached 100%, is relatively shorter cooling time.

  Because of the thermal expansion valve comprises the temperature sensor of the charging structure characteristic, decided the valve itself, the job is a must in an open valve superheat and a superheat of the refrigerant flow, flow regulation. Therefore, how to maintain the valve in an evaporator in the cooling process, always have a smaller opening degree of superheat, even zero superheat working. We are on the thermal characteristics of the thermal expansion valve selection and discussion must perform a task.

  Now foreign well-known company's products have been provided to meet the various requirements of thermal characteristics of the thermal expansion valve, in our country, although most of the manufacturers have yet to master this technology, but some manufacturers have various thermodynamic characteristics of production experience and successful products ( including zero superheat ), in the and well-known foreign companies products compared favorably. The following test curve is domestic has superheat characteristics of thermal expansion valve in the Bitzer lab and Danfoss and Parker similar products at the same time as the test ( Figure 1), test results reflect the cooling rate than similar products in the Danfoss fast, stable evaporation temperature when the temperature fluctuation is only 4 ℃, and Danfoss products 10 ℃(Figure two ), the test shows that the domestic product action respond well, sliding coefficient, low temperature low superheat small. Filling and other performance indicators can better than the top foreign products.

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