Compare Heating And Air Conditioning Manufacturers
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Air conditioning source heat pump design case study – heat pump air-source heat pump air – Heating and Air Conditioning Industry
Firstly, the types of heat pumps and their characteristics:
 1. Scroll compressor units heat pump:?
Scroll compressor compressor capacity, stable operation, low vibration, low noise, used air – air heat pump, adapted to medium and small projects. ?
2. Piston compressor units of the heat pump:?
compressor piston compressor capacity, complex low speed, vibration, noise, great, the ability of small units, multi-head combination can be assembled into a 1 million kcal / pumps Heat about COP = 3.0 ~ 3.5;?
3. Screw compressor heat pump units:?
compressors Screw compressors for volume, simple structure, stable operation, low vibration, low noise, long life, COP = 3.5 ~ 4.5, suitable for medium and small projects, the units pump with multiple heads can be used for larger projects. single screw for the operation of a balanced manner, wear a small non-axial thrust, the exhaust efficiency is slightly lower than the twin-screw. ?
2 Heat Pump Design: 1. principles of selection:? Heat pump has advantages and disadvantages, with the same capacity, compared with only cold water unit, power, high cost, with air temperatures in winter heating capacity of mitigation severe frosts, etc., Yes, when a steam source in a project, air conditioning cold and heat source must be "single unit heat exchanger cold water over" program. Wuxi city district heating steam is formed, we should have priority over programs. I think that hospitals, hotels and other requirements high temperature of the winter heating projects are not suitable for heat pumps, office buildings, hotels and other projects are more appropriate because they are generally used during the day, decay heat pump heating capacity is low, and even heating the least effective people inside can wear more clothes and assign smaller. ?
2. Method of Selection:? Although the area south of the cooling load is greater than the general mechanical thermal load, but the designers should calculate the cooling load summer and winter, the burden of thermal engineering, Press Unit of cooling capacity of cooling load to select the model heat pump, and then locate the following inequality is established: Heat Pump temperature outside air in winter (Eg: Wuxi area -5) heating capacity under construction in the heat load in winter. If inequality is, the unit selection appropriate heat pump. If inequality does not hold, must be located in the air conditioning pipes on the heater booster or increase the capacity of heat pumps. Inequalities in southern China on the whole project is implemented. ?
3. Reciprocating and screw-type heat pump a number of performance comparisons:?
The turnover of interest to many manufacturers trade, often unilaterally, or even malicious slander a trademark or piston, screw pumps heat, we designers can not be blinded by the trivial, the understanding of the performance of different models to the selection of the right to judge. ? burn compressor problem: One of the reasons is that the selection did not lead to evaporation, for example, piston or screw pumps heat (taken
With the F-22 refrigerant) selected more difficult because of the evaporator back easily burn compressor oil; second reason is that the impurities because the oil lubrication system is dirty, or the suction filter of compressor for mixing was broken causing impurities inhalation Smoke compressor, impurities are easily damaged electrical insulation; The third reason is the protection Overtemperature protection against surges, Protection of short circuit, defective?
liquid impact problems: In fact, the impact of liquid on the piston and screw compressors are negative, both the compression efficiency should be reduced;
effective control of the compressor: piston-type and type heat screw pump cooling (heat) quantity by controlling the capacity control valve when the piston compressor part load operation can be reduced to accommodate the number of cylinders, screw compressor is regulated by a drawer. In the part of the load, both shaft power were lower values of COP are run almost [1]?
oil problem: the piston and screw compressors are required summer and winter on heating oil, so that the refrigerant oil
volatiles for the normal lubrication of the compressor?
maintenance problem: parts of piston compressors around 268, the vulnerability of over 1000 hours of repair, maintenance, large, and screw-type compressor about 26 pieces, wearing small, trouble-free operation for many years. In normal operation, after a number of years if you replace the oil, filters, bearings, etc.?
Noise: screw heat pumps are the main sources of fan noise, the noise unit typically 80dB (A) whether, if the units must use low noise, low speed, vibration (via static and dynamic balance test) products fan, as the Xerox 100 German companies are using axial fans, noise 100RT screw-type heat pump can be controlled within 74dB (A) left and right. The piston pump units 80dB noise in general (A) above. It should be noted that the method measurement noise standard room and measured tone and the difference between issues of environment normal?
We also need to taste manufacturers of heat pumps heating capacity in winter is 8 value of the ambient temperature, not the air temperature in winter, the calculation value. ?
3, heat pump Case Study Design:
The following for years, I have met in the design or see the case study on heat pumps, after discussion with colleagues. ?
Case: A project is a long history and has the local characteristics of the foreign business hotel, located in the roof of the six central air conditioning unit model YCA90H heat pump (cooling capacity: 81kW), the water pump SB-X80-65-155K (90T / H, 31M; 11KW)
The system, some heat pump does not start. I would first check the chilled water pump, water pump running current was revealed that half of the rated current, the water pump plant to recognize quality problems, changing the parameters of the base value close the design of the wheel. The system running again, individual heat pump does not start the problem persists, indicating that the root of the problem is not a pump the size of the maintenance issues before and after the flow of chilled water. At this time, some designers began to suspect a drag pump units heat pump program 6 No, no frozen water lines for the different programs, the pump demand, heat pumps are consistent with the program. I think the two above options are feasible. I found that after the heat pump and even individual outlet pipe on the adjustment screw speed switch set to a minimum, have yet to start, difficult to use a screwdriver to open the balance pressure unit. The construction site after several research and the flow switch, flow meter finally found a balance sheet the other end of a very modest little screws to screw described above forces, on the contrary, they are a About the Author
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