Detailed interpretation of the expansion valve adjustment

Most people think: the expansion valve factory of chiller by set, in the practical application of small not ran to adjust. This statement is correct? "he thinks is wrong. The editor had seen a water source heat pump units, its standard conditions for heating the ground water in and out of the water temperature is 15 y/F 9 ℃. Hot water in and out of the water temperature of 40 y/y: 45 and actual work [: conditions for groundwater in and out of the water temperature for IoY / 5 y, hot water in and out of the water temperature for 48 y / 4412. The unit at the beginning of the start, hot water and low temperature 43 ℃, liquid inside without refrigeration gas. And more than that - 'temperature, liquid gas within the territory of gradually increased, and when the water temperature reached 48 y, junction box of screw compressor in 19 I water now.

Met no you don't know, when using the water source heat pump units refrigerating in summer, if the underground water temperature is less than 20 liao, refrigeration effect instead of the unit is very poor, even the normal operation of the unit, is this why? Each learning refrigeration professional knows, condensation temperature is lower, the unit into the pressure difference is smaller, the greater the displacement of the unit, the unit refrigeration effect should be raised, why unit refrigeration effect drops? This is caused due to the insufficient of the refrigerant supply. When we are in the unit running as long as careful observation will understand, normal operation of the unit compressor back to the gas pressure is too low and cattle production in the low voltage protection. Why will appear low voltage is too low, it completed from the air conditioning unit of the working principle of thermal expansion valve. Cavity expansion valve of water chiller chooses whether mechanical thermal expansion valve, electronic expansion valve, or although can automatic adjusting system for liquid volume, but its range of adjustment, the adjustment precision is very limited. Chiller when leaving the factory, the opening degree of expansion valve adjusting for chiller under standard conditions, although in the vast majority of T condition can run normally, but it does not say in what the conditions of groundwater to the highest efficiency in the operation of"

Let's detailed analysis of the thermal expansion valve on the process. Thermal expansion valve is used, white regulate the amount of fluid for evaporator, to ensure that the evaporator has enough supply liquid refrigerant, and not for large amount of liquid. The size of the expansion valve opening is mainly out of the compressor concave temperature and evaporation temperature of the evaporator. Between evaporating temperature and the temperature of the obituary kai leather saturation pressure control valve, pressure difference, the greater the expansion Yang open, the greater the pressure difference is smaller, the smaller the opening, to ensure the normal operation of the unit. But don't forget, this adjustment is error, is not absolute "KuangCong, there is another factor, affecting the fluid for quantity refrigerants evaporating pressure and condensing pressure difference; the value of refrigerant supply is also very big, the influence of the evaporation pressure (temperature) and condensing pressure (temperature), the greater the difference between the refrigerant flow, the more people, vice versa. So should be in accordance with the actual working environment to adjust the water chiller expansion valve opening.

To prevent underground water temperature is low, the water source heat pump units refrigeration, will ask gas pressure of compressor (evaporation temperature) on the low side, cause the phenomenon of low voltage protection; Most of the water source heat pump units production / - require refrigeration, groundwater water temperature above 20 ℃, 35 ℃ to 301 I/is. In the case of groundwater temperature is low, with wide shall not reduce the groundwater water to water, or will be part of the drainage reuse. This is for the user in the case of laymen r, may not have to work on, do you not know that in groundwater at a lower temperature, if you can guarantee for fluid volume of evaporator, refrigeration efficiency of the unit will improve a lot.

Air conditioning equipment manufacturer according to most discouraged hunger group run the machine to adjust the actual working condition of the remedy of expansion valve open shoulder degrees, this is mainly out of consideration for the running stability of silk. Because the vast majority of users and 44 is very butyl solution refrigeration principle of the unit. Allow the user to adjust itself according to the actual working condition is not realistic, even cause serious harm to the unit, the work is for most of the repair factory L is also hard to do. Similarly, is because the user doesn't know your machine since the 15th and run in the best condition, also not be able to come to the house of J similar requirements! The user can only in the case of laymen, pay for the low efficiency of the unit.

Adjustment of the unit expansion valve, to improve the operation efficiency of the unit is very important, but it must be by professionals proficient in refrigeration technology to adjust. Must not adjusted freely, otherwise, the industry is hard to imagine the consequences of c in tune when, want to make sure the unit evaporating temperature, condensing temperature range, according to the change of intermediate value adjustment, don't frequent adjustment of expansion valve opening, so is not conducive to the stability of system operation.