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To prevent stratification of the hot water molecules into the cooler water as heat goes to cold

Q: What is the purpose of a check valve on recirculating hot water system?

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To prevent stratification of the hot water molecules into the cooler water as heat goes to cold

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A closed system is a system that can exchange energy (heat and work)with its surroundings, but can not exchange matter with its surrounding.

A greenhouse to some extent can be thought of as a closed system exchanging heat with its surroundings.

In general, a system is the part of the universe under consideration.

Systems can be isolated, closed, or opened.

An isolated system can not exchange energy, and can not exchange matter with its surroundings.

In contrast, an opened system can exchange both energy and matter with its surroundings.

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Enthalpy-The heat added to or loss by a system at constant pressure

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It cycles coolant through the engine. Heat from the engine is transferred to the coolant through a heat exchange. The heated coolant then cycles through the system to the radiator, where heat from the coolant undergoes another heat exchange, transferring heat from the coolant to the air which passes through the radiator.

Heat will also transfer from the motor to the air forced over the motor by the engine fan.

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It cycles coolant through the engine. Heat from the engine is transferred to the coolant through a heat exchange. The heated coolant then cycles through the system to the radiator, where heat from the coolant undergoes another heat exchange, transferring heat from the coolant to the air which passes through the radiator.

Heat will also transfer from the motor to the air forced over the motor by the engine fan.

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