Closed Loop Water Heating System

A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water.

Closed loop water heating system. Most modern hydronic heating and or cooling systems are closed systems that must be maintained at some minimum pressure. This would seem to be a simple concept but it is surprising how often a lack of attention to the basics can cause all kinds of problems. The main advantage to this system lies in the fact that being closed anti freeze instead of water can be used as the heat transfer medium. Why we do not recommend open loop heating systems.

A closed loop cooling system can exchange heat with the main cooling water system in conventional tube and shell heat exchangers or plate and frame heat exchangers. Unless the system has a leak the makeup requirements are minimal. This is characteristic of most chilled water systems and hot water heating loops. The valves that are usually found in the closed systems are the check valve pressure reducing valve mixing valve backflow preventer and other.

Each has its advantage when part of a cooling or heating system. The tubing is connected to the heat pump and with the proper antifreeze solution it is circulated throughout. The fluid in a closed system is re circulated around and around in a completely closed loop. There is no connection whatsoever to the domestic water supply.

Closed loop solar water heater systems sometimes referred to as anti freeze or glycol systems include the heat collectors insulated piping a circulating pump an expansion tank a hot water storage tank a heat exchanger solar fluid usually a solution of water and nontoxic propylene glycol antifreeze a controller valves and gauges. Closed systems must be pressurized to satisfy three requirements. However when leaks occur it can be costly and difficult to maintain the treatment levels necessary for corrosion and deposit control. Routine testing of conductivity ph or alkalinity and inhibitor level is used to determine if there has been any.

Overview of closed loop water system cooling or heating systems that use water can have one of two main types of systems for dissipating heat acquired by the liquid closed loop or open loop. Chilled water systems air. The critical difference between these is the amount of exposure the water has to the air. It is any system where you mix heating water and drinking hot water potable in the same system.

The water in a closed cooling system is continuously recirculated. Closed heating and cooling water systems typically require little makeup water and minimal chemical additions following the initial system charge. The low temperatures of a radiant floor system can become a breeding ground for potentially fatal bacteria. A closed loop system uses a continuous loop of pex tubing as a heat exchanger.