1. Heat Pump Application
Low Temperature Heat Pumps
Heat pump working principle as a natural phenomenon, as the water flow from a low height,
the heat is always from high temperature to low temperature. But people can create
machines, like the water from low to high and the water pump, using the heat pump can take
the heat from low temperature to high temperature and suction. So low temperature heat
pumps is essentially a heat device for lifting, itself part of the energy consumption,
environment medium of stored energy to mining, improve the temperature for use, and the
heat pump device consumes power only for the heating capacity of 1/3 or less, this is also
the heat pump energy saving features.
Heat Pump and Refrigeration Principle
Heat pump and refrigeration principle and system components and functions are the same,
and the vapor compression type heat pump system is mainly composed of a compressor, an
evaporator, a condenser and a throttling valve. Compressor plays a compressing and
conveying refrigerant from low temperature to high temperature and high pressure of the
role, is the heat pump system in the heart; the evaporator is cold output device, its role is to
make the throttle valve into the liquid refrigerant evaporation, to absorb the heat of cooled
object, to reach the purpose of refrigeration; the condenser is heat output device, from the
evaporator absorbs heat together with the compressor power consumption the
transformation heat in the condenser cooling medium away, achieve the purpose of heating;
the expansion valve or throttle valve for circulating working fluid can play the role of throttling
decompression, and regulate the refrigerant flow into the evaporator. According to the
second law of thermodynamics, the compressor the work done to get compensation, makes
the circulating working medium continuously from low temperature to high temperature
environment and the heat absorption, heat, and reciprocally cycle.
Air To Water Heat Pumps
Heat pump is the need for the heat of the condenser, evaporator, heat from the environment,

2. and this time from environmental heat objects is called heat source; the opposite is the need
of cooling capacity refrigeration evaporator, condenser exhaust heat to environment, and the
environmental heat objects known as cold source. Evaporator condenser circulating working
fluid and environment according to the heat transfer medium, mainly divided into the air heat
exchanger and water heat exchanger in two forms. Using air as the heat source air to water
heat pump, known as the air source heat pump. Air source heat pump has a long history, and
its installation and use are convenient, widely used. The use of water for cooling and heat
source of heat pump is known as the water source heat pump. Water is a kind of excellent
heat source, the heat capacity, good heat transfer performance, general water source heat
pump cooling and heating efficiency or capacity is higher than that of air source heat pump,
but due to the restriction of water source, water source heat pump application far less air
source heat pump.
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