Principle of 150 kw Ultra-low temperature variable frequency cascade high temperature heat pump unit
The basic operating principle of the cascaded high temperature air source heat pump unit is based on the reverse
Carnot cycle principle. The working fluid system is divided into a low temperature level circulation system and
a high temperature level circulation system. The low-pressure gas is compressed into a medium-temperature and
medium-pressure gas by the low-temperature stage compressor, and enters the intermediate heat exchanger to
condense into a liquid state to release heat. The liquid working medium is decompressed and expanded by the
expansion valve and then returns to the fin In the heat exchanger, the evaporation heat is absorbed again to
complete a low temperature cycle; at the same time, the liquid working medium of the high temperature machine
absorbs the heat transmitted by the low temperature stage in the intermediate heat exchanger and evaporates
into a medium temperature and low pressure gas, and the low pressure gas is compressed by the low pressure
stage compressor. The medium-temperature and medium-pressure gas is compressed into a high-temperature and
high-pressure gas by a high-temperature compressor, which is condensed into a liquid state in a heat exchanger
to release heat to produce high-temperature hot water. In the intermediate heat exchanger, the evaporation heat
is absorbed again to complete a low temperature cycle; through the reciprocating cycle, the effect of producing
high temperature hot water at a low temperature ambient temperature is achieved.
 
The ultra-low temperature variable frequency cascade high temperature heat pump unit adopts the form of R410A low temperature stage and R134a high temperature stage system. Heat exchange for making hot water or heating. The ultra-low temperature cascade high temperature heat pump unit adopts DC frequency conversion technology, which has high heating energy efficiency. Temperature can be stable heating 75 ° C.
 
Performance characteristics of 150 kw Ultra-low temperature variable frequency cascade high temperature heat pump unit
1. Full DC frequency conversion control technology: The frequency conversion control technology based on variable working conditions can automatically adjust the load; the heating capacity is less attenuated, and the heating capacity is increased by 30% compared with the conventional single-system heat pump;
2. High temperature of water supply: high temperature special compressor is adopted, rated supply/return water temperature is 70°C/60°C, and water supply temperature is up to 75°C;
3. Good low temperature performance: normal heating 70°C at -30°C ambient temperature, heating COP at -12°C/-14°C ambient temperature not less than 1.8, heating COP at -25"C ambient temperature Not less than 1.5;
4. Wide range of applications: the water supply temperature is 40°C~70°C, the applicable ambient temperature is -35°C~25°C, and it is suitable for a variety of terminal forms, and can be used in most cold areas in northern my country;
5. Easy installation of the project: the overall modular structure design is adopted, the structure is compact, the operation noise is low, the floor space is small, and the installation cost is low;
6. Remote cloud monitoring: The whole system is equipped with a remote monitoring system, which can check the operating status and operating parameters of the unit in real time, check fault alarms and operate remotely, and realize 24-hour unmanned management.