The thermostat is where it all begins with your home’s heating and cooling system. When you set it, the thermostat triggers, regulates and monitors the climate control process in your home and helps keep your family comfortable.

A thermostat is the key component of the engine cooling system. The cooling system keeps the engine from overheating. A water pump pulls the coolant from the radiator and moves it back into the engine. The normal operating temperature of a modern engine is between 194°F (90°C) and 221°F (105°C).

The major components of the cooling system are the water pump, freeze plugs, the thermostat, the radiator, cooling fans, the heater core, the pressure cap, the overflow tank and the hoses.

First, it removes excess heat from the engine; second, it maintains the engine operating temperature where it works most efficiently; and finally, it brings the engine up to the right operating temperature as quickly as possible.

Types of Cooling Systems

• Central Air Conditioners and Heat Pumps. Central air conditioners and heat pumps are designed to cool the entire house.
• Room Air Conditioners.
• Evaporative Coolers.
• Ductless Mini-Split Air Conditioners.
• State of the Art Cooling.

There are two types of cooling systems: (i) Air cooling system and (ii) Water-cooling system. In this type of cooling system, the heat, which is conducted to the outer parts of the engine, is radiated and conducted away by the stream of air, which is obtained from the atmosphere.

Chilling your drink in ice is an example of cooling. This will lower the temperature. Chilling your drink in ice is an example of cooling. Common ways to cool things down are to put them in ice or taking them some place where it is cold. This will lower the temperature.

Physical operation in which heat is removed from process fluids or solids; may be by evaporation of liquids, expansion of gases, radiation or heat exchange to a cooler fluid stream, and so on.

The methods of cooling are:

• Stir soups, sauces, gravies and chilies while the container is in an ice water bath.
• Transfer hot foods to shallow pans with a product depth of four inches or less and refrigerate.
• Cut solid foods, such as roasts of meat, into portions of six pounds or less after cooking and prior to cooling.

There are six basic types of liquid cooling systems:

• Liquid-to-liquid.
• Closed-loop dry system.
• Closed-loop dry system with trim cooling.
• Open-loop evaporative system.
• Closed-loop evaporative system.
• Chilled water system.

Approved and efficient ways to cool food include:

• Ice-water bath and frequently stirring the food.
• Ice paddles (plastic container filled with water and frozen) used to stir food in an ice-water bath.
• Adding ice as an ingredient (if water is an ingredient).
• Blast or tumble chiller.

Vacuum cooling is based on the principle of evaporation: as water evaporates from the product, energy is removed, and the temperature drops.

The necessary heat of evaporation is extracted from the sweat itself, which leads to a heat transfer from the liquid into the gaseous state. This results in a cooling effect (called evaporative cooling) that helps to maintain body temperature and cools the body down when it gets too hot.

Boiling can be considered as a cooling process because as a liquid reaches its critical temperature, heat escapes through rapid evaporation. Essentially, boiling happens when liquids turn into gases, forcing excess heat out of the liquid. Kinetic energy increases as heat increases.

Sublimation is caused by the absorption of heat which provides enough energy for some molecules to overcome the attractive forces of their neighbors and escape into the vapor phase. Since the process requires additional energy, it is an endothermic change.

When water freezes it gives up some of the water’s energy. This energy that is given up is the latent heat of freezing. When the water was freezing latent heat of freezing energy was being released. It is this heat energy that prevented the temperature from continuing to cool once the temperature reached 32 F.

Phases and Phase Transitions

When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.

Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. The direct conversion of a solid to a gas is sublimation.