1 heat pump system economic operation of the basic requirements:
1, as much as possible the use of high temperature heat source.
2, the actual temperature difference between heat source and heat medium is the lowest.
3, the heat source should meet the following requirements:
Provide the required heat at the highest possible heating temperature.
The use of heat sources need to increase the cost of lower.
No matter chemical or physical, have no adverse effect on heat exchange equipment.
When the heat conditions change, have better adaptability.
Transmission equipment such as fans, pumps and other energy consumption as low as possible.
2. The heat pump system compressor should meet the following requirements:
1, for air source heat pump, should be able to operate normally in the range of tz = -35 ~ + 15oC and tl≤65 oC; the compression ratio should be as high as 9, there should be satisfactory efficiency; at the same time, there should not be too high overheating temperature .
2, the inhalation of steam in the superheated and unsaturated state, the compressor is not affected by the quality of inhalation.
3, can withstand the rapid changes in work pressure, does not produce oil foam; oil should be returned to the crankcase with steam, and in the box with immersion heaters.
4, there should be good, reliable over-temperature, over-voltage protection device. Trouble-free operation time in more than 25000h.
5, Larger heat pump, should be equipped with a smooth and without loss of energy mediator.
6, Compressor equipped with motor, with a flat efficiency curve.
Based on the above requirements, put forward the following recommendations:
Heating Q = 0.5 ~ 500KW, the use of positive displacement.
Heating Q> 500KW, the use of centrifugal.
3. Refrigerant flow control
In order to use thermal expansion valve is appropriate, and should be "balanced hole" type, in order to maintain the pressure does not change with the change, but in the smaller pressure drop the normal operation.
4. Economic judgment
For a certain performance of the heat pump system, the following conditions are generally considered to be economical:
There is a good heat source like groundwater.
The annual running time is not less than 2000h.
COP value> 3
In the summer cooling on the basis of the heating cycle, does not require additional energy.
Refrigeration equipment has been used in the occasion, such as cold storage, skating rink, supermarkets and so on.
Waste heat available for use. Large internal waste heat within the building, it is possible to use the internal heat source to heat the building when the ambient temperature is below zero, such as department stores, theaters, computer rooms.
Conversely, if it is the case of heat pump, its economy can not be sure:
Just for heating.
COP <3.
Heat pump capacity is much larger than the heating load.
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