Drain Back Solar Water Heating System

Drain back systems are a smart choice when designing a solar thermal system to supplement central heating and domestic hot water components.

Drain back solar water heating system.

A drainback system lets you use solar power to heat water for your home. The water drains by gravity to the storage tank and heat exchanger. The heat exchanger is often inside the drainback reservoir and a second pump circulates domestic water through the exchanger which is immersed in the htf. They re the best choice in hot climates although they re more expensive to install than ics.

There are no valves to fail and the system is completely non pressurized. The two dominant types today are the pressurized glycol system and. Most of the time the heating fluid is water less propylene glycol which can deteriorate over time and needs replacement. There are many types of solar hot water systems pressurized closed loop pressurized open loop drain back thermosyphon and variations called direct and indirect referring to the placement of the heat exchanger.

The solar drain back tank comes in seven models ranging from ten gallons to 80 gallons. Understanding solar hot water systems the drain back design. High performance easy construction with simple materials long life and low maintenance all for a price that is about 1 7th of equivalent commercial systems. Solar system when there is no longer a demand for hot water.

The third type of drainback solar water heating systems uses heat exchanger which is located outside the water storage tank. Indirect active closed loop drainback systems are an excellent choice for heating water unless you receive a lot of snow and have really cold temperatures. The next 5 entries are for a simple all climate drain back solar water heating system i have been developing and have installed at my place. There are variations among the variations.

Drainback solar water heating system. A heat exchanger to transfer heat between the drainback loop and the end use water unless it is a pool system. It can also be purchased with or without a heat exchanger. A pump circulates the water through the collectors.

Drain back systems use distilled water as the heat transfer fluid htf in the collector loop. The drain back tank ships without a heat exchanger for use with a solar water heater with an internal heat exchanger. Drain back systems have fewer components than pressurized systems making drain back systems easier to use service and maintain.