Air-cooled heat pump air conditioning defrosting control methods

Project Description:

Air-cooled heat pump air-conditioning defrost control method is one by measuring the evaporator outlet wind speed to achieve. The invention first simulates the system to obtain the relationship between the evaporation temperature and the outlet air velocity of the evaporator. And then calculate the evaporation temperature according to the wind speed measured by the wind speed sensor installed at the outlet of the evaporator. The evaporator surface temperature is obtained according to the relationship between the evaporator surface temperature and the evaporation temperature, and then the evaporator surface temperature is used to determine whether to defrost. Finally, it is determined whether to end the defrosting according to whether the outlet air velocity of the evaporator reaches the threshold during normal operation. The invention is mainly characterized in that the control method comprises the following steps of: 1) simulating an air-cooled heat pump air conditioner to establish a simulation model of an outdoor unit, an indoor unit, a compressor and a throttling element; 2) establishing a simulation model based on the pressure balance, the mass balance and the energy balance Principle, the system frosting operation simulation calculation, the evaporator evaporation temperature and evaporator outlet velocity relationship as follows: t0 = 0.1417v5-0.5463v4 +0.6173v3-0.0988v2 +0.4941v-4.9040 3) in the outdoor unit evaporation (Eg, Î”tw = 1.5 â„ƒ, tw = -3 â„ƒ); set the time step (such as 2min) and the normal operation of Wind speed threshold (such as 1.8m / s); 5) when the air-cooled heat pump starts running, the wind speed measured by the wind speed sensor within a time step into Equation 1, the evaporation temperature t0; 6) Temperature t0 into equation 2, the evaporator surface temperature tw; 7) to determine whether the calculated evaporator surface temperature tw reaches the set value; 8) If tw reaches the set value, start defrosting; if not reached, continue running ; 9) start defrosting , When the measured wind speed v reaches a set threshold value (for example, greater than 1.9m / s), the end of defrosting, defrost or continue.

Application prospect:

Through such a defrost control method, not only simple and easy, but also a good energy saving, to overcome the shortcomings of the traditional defrost control technology, good control of defrost

Construction Hoist Steel Structure means the Construction Hoist Spare Parts like Construction Hoist Mast Section, Passenger Hoist Cage , Construction Hoist Wall Tie and so on.

The length of each Mast Section is 1508mm, the rack is fixed on the mast by three bolts and it can be exchanged. For the single cage hoist there is only one rack on the mast section, and the mast section can be used for the double cages hoist by increasing one rack. The section of the mast is diverse, select one type section according to different hoist. The mast sections are bolted together with M24 bolts and nuts to form mast. The mast is tied to the building with tie-in and is the guide rail of the cage. According to the user`s or circumstance`s request, surface of mast is hot dip galvanized, which can prevent it rusting.

The tie-in(wall tie) is the linked part between mast and building, to keep the stabilization of the mast. Distance between the tie-in is about 6~9m alone the mast. There are several types of tie-in. Select one of them according to need, tie-in can adjust the vertical of mast in definite ranges. According to the user`s or circumstance`s request, surface of the tie-in is hot dip galvanized, which can prevent it rusting.

The cage dimension(LÃ—WÃ—H)(m): 3Ã—1.5Ã—2.5. We can also manufacture cages of other size according to the user`s needs. The material of the cage and the door material can be steel wire weave, aluminum-plastic panel, punched-plate, figured aluminum board or other type according to user`s needs. The gate is equipped with drawing gate,include small turn over gate.

Construction Hoist Steel Structure

Construction Hoist Mast Section,Construction Elevator Mast Section,Passenger Hoist Cage,Construction Hoist Wall Tie, Construction Hoist Anchorage Frame

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