Heat pump system design considerations

First, the basic requirements of the economic operation of heat pump system: 1, as far 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: --- In the highest possible heating temperature to provide the required heat. --- The cost of using the heat source is lower. --- Whether in the chemical or physical, heat exchange equipment does not have a negative impact. --- Heat conditions change, better adaptability. --- Conveying equipment such as fans, pumps and other energy consumption as low as possible. Second, the heat pump system compressor should meet the following requirements: 1, for the air source heat pump, tz = -35 ~ +15 oC and tl ≤ 65 oC range should be able to operate normally; compression ratio up to 9, there should be satisfactory Efficiency; the same time, there should be no excessive temperature overheating. 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. Third, the refrigerant flow control to the use of thermal expansion valve is appropriate, but should be "balanced hole" type, in order to maintain the pressure does not change with the change, but in the case of smaller pressure normal operation. Fourth, the economic judgments For a certain performance of the heat pump system, the following conditions are generally considered economical: there is a good source of heat as groundwater. The annual running time is not less than 2000h. COP values> 3 No heating is required for heating cycles based on summer cooling. 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, the economics of a heat pump in the following situations are not certain: for heating only. COP <3. Heat pump capacity is much larger than the heating load.

LED Guardrail Light

LED guardrail light barrier lights on the LED light source, there are red,yellow,green,blue,white,purple,green or colorful color, such as by microchip control, which can realize the gradient, jump, color flashing, random, alternating gradient, chase, scan flow such as color change.

It is especially suitable for the application of the billboard background, overpass bridge, river, lake guardrail, building outline and other large dynamic light belts, which can produce a rainbow gorgeous effect.The outline of the building is decorated with a guardrail, which can accentuate the effect of beautifying buildings.It has turned out to be one of the best lighting products in the world.

led  guardrail light

Product size

led wall washer light


Installation Instruction

LED Guardrail Light


Description of products

1.The lamp uses radiant heat dissipation structure design, can let lamps and lanterns have better heat dissipation effect.

2.Meet the protection requirement of IP65, pass national lamps and lanterns quality detection center detection.

3.High strength tempered glass, transparent and uniform.

4.Adopt ACC12 die casting aluminum and surface is processed by process

5.The high purity acrylic optical lens improves the luminous efficiency and ensures the output of luminous flux.

6.The luminaire implements 256 gray scale, 16.7 million R/G/B synthetic color changes.






Led Guardrail Light,Led Wall Washer Light Fixtures,Led Wall Washer Flood Light ,Led Wall Washer Light Products

Jiangsu chengxu Electric Group Co., Ltd , https://www.chengxulightings.com