Why latent heat is high in refrigerant?
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Why latent heat is high in refrigerant?
A refrigerant should have high latent heat of vaporization at the evaporator pressure. The high latent heat results in a high refrigerating effect per kg of refrigerant circulated. It must have high thermal conductivity to reduce the area of heat transfer in the evaporator and condenser.
Which is highest latent heat refrigerant?
Ammonia is toxic and flammable unlike Freon. Steel tubes are used for ammonia systems and copper tubes are used for Freon systems. The advantage of using ammonia is that it has a much higher latent heat of vaporization.
Why is it important that refrigerants have high latent heat of vaporization?
High Latent Heat of Vaporization Higher latent heat of vaporization of the refrigerant will result in lower mass flow rates according to the Heat transfer equation. If the mass flow is very small it is difficult to control the flow rates. Therefore ammonia cannot be used for small refrigeration systems.
What does a higher latent heat mean?
Likewise, the high latent heat of vaporization (see below), indicates that when water vapor (derived from evaporation of water at the ocean’s surface driven by solar energy receipt at low latitudes) condenses into liquid droplets at high elevations or high latitude, the latent heat is released into the environment.
Why critical pressure of refrigerant should be high?
Why is the Critical Temperature of a Refrigerant Important? The critical temperature of the refrigerant should be as high as possible above the condensing temperature in order to have a greater heat transfer at a constant temperature.
Why does refrigerant absorb heat?
The refrigerant leaves the expansion valve at low pressure and temperature then heads straight into the evaporator. The temperature of the room air is higher than the temperature of the cool refrigerant this allows it to absorb more energy and boil the refrigerant completely into a vapour.
What is high temperature refrigeration?
HIGH TEMPERATURE is used for product storage above freezing. Usually the range is below 40° F and above 32° F. MEDIUM TEMPERATURE is used for storing frozen foods and fresh food storage. One example is a home refrigerator’s freezer compartment. The temperature is above 0° F and below 32° F.
Why is the latent heat of water high?
High Latent Heat Capacity of Water Because it takes more energy to convert a substance from one physical state to another (solid to liquid, or liquid to gas), those transitions require a larger amount of energy.
Why does water have such a high latent heat?
Water’s high heat capacity is a property caused by hydrogen bonding among water molecules. When heat is absorbed, hydrogen bonds are broken and water molecules can move freely. When the temperature of water decreases, the hydrogen bonds are formed and release a considerable amount of energy.
Which refrigerant has highest pressure?
∴ Ammonia has the highest critical point pressure.
What is the difference between high medium and low temperature refrigeration?
What is the difference between high, medium, and low temperature refrigeration? – Quora. High temperature is the air conditioner range. Medium temperature is food storage temperatures above zero celsius. Low temperature is frozen food and ice cream.