High-temperature air source heat pump air heater with evaporator with adjustable heat exchange capability

Abstract

The invention discloses a high-temperature air source heat pump air heater with an evaporator with adjustable heat exchange capability. The heat pump air heater comprises an air source heat pump and acondenser air blower, wherein the air source heat pump mainly comprises an evaporator, a compressor, a condenser and a throttling device which are sequentially connected by working medium circulatingpipelines; and the ratio of heat exchange area of the evaporator to the input power of the compressor ranges from 8.7 to 20m<2> / kw, the ratio of heat exchange area of the condenser to the input powerof the compressor ranges from 5.6 to 15m<2> / kw, and the evaporator is provided with the air blower with adjustable air flow. The invention improves the working capability of the heat pump air heaterin the mode of adjustable input; and under the same working condition, the air-out temperature thereof is greatly improved, the system can normally and stably run, and meanwhile, the energy efficiencyratio thereof exceeds the national standard by more than 50%. The invention provides hot-blast air with higher temperature, greatly expands the application range of the air source heat pump, and plays a positive role in energy conservation and emission reduction.

Description

technical field [0001] The invention relates to an air source heat pump fan, in particular to a high temperature air source heat pump fan with adjustable heat exchange capacity of an evaporator. Background technique [0002] The air source heat pump is mainly composed of compressor, evaporator, throttling device, condenser, working fluid circulation pipeline and other parts. Based on the principle of the reverse Carnot cycle, it is driven by electric energy, and effectively absorbs the unusable low-grade heat energy in the air through the heat transfer medium, and upgrades it to the available high-grade heat energy for use. Its working process: ①The evaporator fan drives the ambient air to flow through the evaporator, the heat transfer working medium enters the evaporator, absorbs the heat in the air in the evaporator and evaporates, at this time, the working medium absorbs heat from the low-temperature heat source and enters the compressor; ②After the working fluid is comp...

AI Technical Summary

Problems solved by technology

However, due to the need to take into account the use of high temperature weather, the method of increasing the heat exchange area cannot be used to increase the ability of the evaporator to collect heat to meet the needs of areas with low ambient temperature in winter.

When the air volume is constant and the evaporation heat transfer area exceeds 8m 2 / KW, the ambient temperature is higher than 32°C, and the system runs for a long time, the compressor load increases, the pressure increases, the power consumption increases, and the energy efficiency ratio decreases

In severe cases, it will affect the service life of the compressor; at the same time, the pressure of the working fluid increases to the pressure set by the built-in overpressure protection of the compressor (28-30kgf / cm 2 ) will cause the compressor to stop due to over-pressure protection, and manual operation is required to restart it, which will bring inconvenience to people's production

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