High temperature heat pump heating water
temperature can reach 80 ℃ over the heat pump.The
limitation of air source heat pump hot water output from all closed compressor
and refrigeration oil loss lubricity, freon coking and motor insulation damage,
etc.On the market at present is most of the air source heat pump using
R22 as a working medium as well as the general condition of the compressor.
As working medium of thermodynamic properties
and chemical properties and general condition of R22 compressor's adaptability,
it is hard to out of the water temperature up to 55 ℃ or more.This is because
the normal working condition of the compressor can withstand the highest
evaporation temperature to the director of the 12 it (if the evaporator inlet
is 20 ℃ the evaporator outlet for 16 ℃, then according to the degree of
superheat 4 considering the evaporation temperature of 12 ℃, the limit of the
allowed by compressor), the largest compressor under pressure 24 kg, RR2
condensing pressure is reached at 60 ℃ condensing temperatures 24 kg.So this
kind of heat pump work scope: evaporator water less than 20 ℃, condenser water
not more than 55 ℃.
For high temperature heat pump cycle working medium,
compressor, system form, heat exchanger optimum design, lubricating oil system
and no non-condensable gas treatment has obvious particularity.To its
application and research must be to choose the suitable working medium, and
then is suitable for the design of the compressor and satisfy the working
medium work unit and intelligent control system, etc.
Japan in the 1980 year was carried out by the heat pump project, 4
kinds of heat pump developed, including the use of more than 45 ℃ hot water, in
the hot water temperature of 85 ℃ high temperature heat pump, and the use of
more than 80 ℃ hot water and output 150 ℃ high temperature heat pump of
steam.Europe is by improving the performance of centrifugal compressor
technology route of high temperature heat pump, using everything refrigerants,
triple eccentric compression mode, heating water temperature can reach 85 ℃.
The emergence of high temperature heat pump,
greatly expand the application field of heat pump, can be directly recycled
more than 20 ℃ ~ 55 ℃ low grade (waste heat) resources, make 65 ℃ ~ 90 ℃ hot
water, and used for heating, heating oil, industrial insulation, production
with hot areas such as alternative fuel, gas, coal-fired boiler, can save a lot
of primary energy, has the very good energy saving and environmental benefits
of high temperature heat pump especially in the aspect of industrial heat,
steam boiler, waste heat recycling, building heating, high temperature baking
food and other industrial products of high temperature baking, etc. Above 80
℃, the basic reach the design standard of the heating in the north, so the high
temperature heat pump can be used as common building heating of the heat source
and heat source.
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