Heated hose pipes are the pipes that offer constant water supply in freezing temperatures. Mostly, they are built and designed to fit personal equipment, structure and requirements. Mainly, they are made up of thermostat switches. As temperature approaches freezing zones, the heat from the heaters keeps the water flowing if need arises. Mainly, the heating element used is copper wire. It’s mainly inside the hose pipeline. It mainly regulates the water flow by turning on and off the heater. The element is usually 50 feet long as it runs with the hose pipe. The length and diameter plays an important role in orienting the pipes performance to the gravity. They assist in promoting the capillary limit and assurance of water flow. According to the manufactures of the heated hose pipe, the heater provides 360 watts that are all consumed by the pipe while plugged in and operating.
Temperature varies on the inlet and outlet respectively. The maximum temperature of the inlet reads at 95° centigrade and the maximum temperature at the outlet is 105°centigrade. In this case, when temperature goes below 95° F it automatically turns on. Similarly, when temperatures go above 105° f it turns off automatically. The electric rating of the pipe is at 120 v, with 60 Hz and 2.9 A. This ensures that the flow of water is constant during frozen temperatures.
The hose pipe is made up of PVC material. In addition, the manufacturers make use of bend restrictors at both ends for making connections. Similarly, the use high performance brass fittings in reinforcing the connections. In this, it ensures that the connection is firm, and the pipe can withstand any test accorded to it. The pipe is fifty foot long with a thickness (diameter) of 5/8".
The pipes are sealed from exposing the electric wires on the surface of the pipe. The copper wire runs beneath the hose line sealing it to avoid exposure to electric current. Similarly, the heat tape used in coating the pipe also plays a crucial role in sealing the electric wires from the outer layer. In addition, to ensure that the user is not exposed to electric current, the manufacture have used heavily insulated wires. Lastly, it is designed in a way that it keeps the heating element off. In so doing, it prevents wastage of electricity and electrocution of the user. Since the heating element is the one close to the surface of the pipe, it ensures, it’s kept off.
Insulation properties depend on the selection of an appropriate outer jacket. The best are the special thermal fleece material and foam hoses (up to 100oC elastomeric foam hose, up to 200oC silicone foam hose)
Selection of a suitable weather jacket is influenced by application, bending radius and ambient temperature.
LIQUID OUTLET FLOW RATE
Diameter and length of the heat pipe affect the flow rate/speed at which the vapor moves. Larger diameter allow more fluid to move per unit time. This allows greater power carrying capability. Short pipes carry more power than long pipes if both applications are not gravity assisted.
Volume flow rate (Q) volume of fluid flowing past a section per unit time in (m3/s)
For example for two pipe sections
D1 =50 mm = 0.050m
D1 = 100 mm = 0.10m
Water at 70 o C
A1 *V1 = A2 * V2
Flow rate at section 2 = ( A1 *V1)/A2 = 2m3/s
Thermistically controlled heated hose pipes have replaced the normal hose pipes that are plugged into the existing power supplies. They assure that the user gets a free flow of water even when the temperatures go below zero. At the time when the temperature is above freezing, the internally built thermostat keeps the heating element off, preventing wastage of energy.
The thermister ensures that the thermohose stays on only at low temperatures. The controls present in the thermohose ensure that the heating elements are extruding directly into the thermohose walls. This ensures unrestricted water flow and uniform heating.
Heat pipes are extremely reliable as they can even be used in space applications where maintenance operations are not available. Heat pipes are highly resistant to failure; however, the main cause of their failure is gas generation inside the heat pipe. This problem can be solved by thorough cleaning and assembly procedures.
The water in heat pipe does not boil at 100 degrees centigrade because the water inside is not at atmospheric temperature; the internal pressure of the pipe is the fluid saturation pressure.
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