Three factors affecting the pump frequency range

Pump speed is generally slow down the problem. When the use of frequency control, the original design by the frequency of the state of the pump and motor operating parameters have undergone major changes, the other as pipeline characteristics curve, speed governor pump in parallel with the constant speed pump and other factors, will be Speed ​​range has a certain impact. Out of range speed control is difficult to achieve the purpose of energy conservation. Therefore, frequency conversion speed regulation can not be unlimited. Generally believed that the frequency control speed should not be lower than the rated speed of 50%, preferably at 75% to 100%, and should be combined with the actual calculation. 1 pump process characteristics on the speed range In theory, high-speed pump speed control area through the frequency-efficient area around the end of two similar conditions parabolic middle area OA1A2. In fact, when the pump speed is too small, the efficiency of the pump will drop sharply. Affected by this, the high-speed pump governor shrank to PA1A2 [2]. Obviously, if the operating point has exceeded this area, Therefore, the minimum speed can be obtained as follows: Since the conditions at point C and point A1 are similar, according to the proportional law: (QC / Q1) 2 = HC / H1 The point C is on the curve H = H0 + S? Q2 There are: HC = H0 + S? QC2 Where, HC, QC is unknown, the solution equation: HC = H1 × H0 / (H1-S? Q12) QC = Q1 × [H0 / (H1-S? Q12) / 2 According to the proportional law: nmin = n0 × [H0 / (H1-S? Q12)] 1/2 2 speed pump on the speed range In practice, the water supply system is often multiple pumps in parallel. Due to the expensive investment, it is impossible to speed up all the pumps, so the general speed pump, fixed speed pump mixed water supply. In such a system, care should be taken to ensure that both the variable speed pump and the fixed speed pump operate at the high efficiency stage and achieve the optimum system. At this moment, the constant speed pump has a great influence on the speed regulating range of the speed regulating pump running in parallel with it [2]. The main points of the following two situations: 2.1 with the same type of pump must be run side by side, although the scheduling flexibility, but can not take into account the speed pump and the constant speed pump efficient work section, therefore, in this case speed range is tiny. 2.2 different models of a pump must be run side by side, if it can reach the speed of the pump at the rated speed of the right end of the high end of the head and high-speed section of the pump head is equal. You can achieve the maximum range of speed operation. However, at this moment, the speed regulating pump and the constant speed pump must not be allowed to run in parallel after the exchange. 3 motor efficiency on the speed range In the case of similar conditions, usually Nαn3, so as the speed decreases, the shaft power will drop sharply, but if the motor output power is too much deviation from the rated power or excessive operating frequency Offset frequency, will make the motor efficiency drops too fast, eventually affecting the efficiency of the entire pump unit. And since the cold motor continuous low-speed operation, but also due to insufficient air volume affect the heat, threaten the safe operation of the motor.

Led Aquarium Light With Timer

Do I need an Aquarium Light timer?

Although it is not necessary,there are unspeakable advantages of an aquarium light timer being used along with bulbs; It helps to simulate the day-night cycle perfectly,timers save energy,when you`re on a vacation it works automatically and gives the light to the plants in your fish tank.

Features

Built-in-Digital-Timer System to control two channels separately
Remote control available
Full Spectrum that mimic natural light to help corals/fish achieve the best balance
90 degree lens thereby to penetrate the depth of water
Easy Adjustable Hanging Kit.

Item Display

Key Features

1.The lifespan is over 50000 hours,low maintenance costs.

2.Energy conservation,saving over 80% energy than the traditional HPS.

3.High light efficiency,90% of the light will be absorbed by the aquatic plants,while just 8%-10% to the HPS.

4.Build-in cooling system,could solve the heat dissipation excellently.

5.Built-in power supply, CE approved, No setup required, just simpler and safer plugs directly into AC85V-264V, no reflector & ballast needed.

Convenient in using lights at the same time.

Package Include

1 X LED Aquarium Light

1 X Free Hanging Kit

1X Free Power Cord

Quality Control systems and after-sales

All the lamps have passed strict quality examination and are packed carefully before shipping.In order that our customers get high quality lamps,we attach importance to every details.

LED Aquarium Light application
1. Indoor use, Compensatory sunlight
2. Sutiable for coral reef, fish and other marine plant growing
3. More better light blue, white, dimmable at different timeDimmable Fish Tank LED Aquarium Lights 40cm

Our Company

Philizon Advantages

Professional: we are professional LED Grow Lights and LED aquarium light manufactuer here in China,you will get Professional and High quality LED Grow Lights and Led Aquarium Light With Timer from us and get good guarantee.

Cost-effective Price:we don`t have the lowest price,but the Led Aquarium Light With Timer you get from us really cost-effective,good quality & decent price.

Win-win situation:Long term business is our mission,we will provide good Led Aquarium Light With Timer and warming service to build a long-term business relationship with you

24/7 unlimted customer service: we are always here for you for your question,any question just email us or call us,we do our best to help you all the way.

Long term warranty: Don`t worry about the quality and we guarantee you 3years warranty for all the LED Plant Grow Light and coral reef led aquarium light.

Best buying experience: you will get the tiptop serive you have ever had,just have a try and you`ll see.

Trade Terms

Payment: T/T, L/C, Paypal, 30% deposits before production, 70% balance to be paid before deliverying(Western Union are welcome)

Sample will be delivered within 7 working days.

Discounts are offered based on order quanlityes.

MOQ:sample order are acceptable

Delivery ways:DHL,UPS,FedEx,TNT, door to door,by sea,by air,etc.

Our products ranges:
LED plant grow lights for agricultural lighting;
LED aquarium lights for fish tanks,corals,saltwater tank,marine tank with reef,coral,sps,lps,fish,etc;

Warmly welcome to take a visit on our factory at any time and we will pick you up at the airport in Shenzhen.

Aquarium Led Light With Timer,Dimmable Aquarium Led Light,Aquarium Plant Light,Led Light For Aquarium

Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumgrowlight.com