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Przegląd tematu
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mans9mdcph
Wysłany: Sob 9:34, 02 Kwi 2011
Temat postu: nike air max 97 Air Heat Pump Water cheap air max
t Pump Water heaters and heat
Pump The main difference between air conditioner is their different operating conditions, the following table expressed their run in the negative condition of temperature and pressure (refrigerant R22). Assume that they run in the winter minimum -5
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, 35 maximum summer outdoor environment (which is representative of some areas in southern China).
Table 3
Piston compressor design and conditions of use set out in Table 3.
Due to: 1, condensing temperature, not only decrease the efficiency of heat pump, but also the compressor can not afford;
Can be seen from Table 1:
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(2) one can deduce from the same winter the outdoor ambient temperature and heat pump water heater condensing temperature or pressure and evaporation temperature or pressure difference always higher than the air conditioner;
The following table gives the fully enclosed compressor and working conditions of temperature, as follows.
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From the Table 2, even if it is type compressor (such as more small and medium presses) can run in the condensing temperature of 55 condition, but the maximum power condition of the evaporation temperature only reached 10 ( The products can be allowed to reach 12.5 ) long-term high evaporation temperature on the compressor at a disadvantage.
(3) evaporation in the summer heat pump water heater pressure always higher than the air conditioner.
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2, condensing pressure and evaporating pressure difference, that is, increased pressure compressor, not only heat pump heating capacity decreased, and the compressor is too large will not satisfy;
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Table 1
3, the high evaporation temperature will affect the life of the compressor motor, or even make it destroyed. Therefore, taking heat from outdoor air heat pump water heater air conditioner running than to adverse conditions, technical requirements difficult. In other words, this structure of heat pump water heater is not in our country can be used everywhere. Second, the heat pump water heater and heat pump air conditioner is the difference between red cream in different ways: the impulse air conditioner use more cream means for the four-way valve, that operating conditions in winter from heating to cooling, then, the indoor blower stops running , in a short time will not have a significant impact. But the water heater is not, in particular the condenser coil placed directly on the kind of tank to be separate defroster.
Table 2
From the Table 3 shows the use of refrigerant R12, or its alternative refrigerants such as refrigerant R134a, the design was recommended by the condensing temperature is 50 , the corresponding pressure 1.14Mpa, evaporation temperature is 10 , the maximum pressure difference to 1.2Mpa; and on the use of refrigerant R22, the recommended condensing temperature is only 40
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, the highest evaporation temperature of 5 , the maximum pressure is 1.4Mpa, because R22 refrigerant condensing temperature with the improvement of higher condensation pressure Soon
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, the same time, exhaust gas temperature rise very high, the compressor oil and valves are all negative. Table 3 has exceeded the number recommended in Table 1 winter air condition, water heater more than the natural condition.
(1) whether in winter or summer, heat pump water heater will always be higher than the air conditioner condensation temperature;
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