This type of chiller is normally used in hospitals and hotels in addition to offices and conference rooms. These sectors require an accurate temperature control as a system failure can directly influence the satisfaction of building occupants.
An example of this type of cooling can be seen in a recent case study carried out by Andrews Chillers , where we provided a kW unit to support a hotel while it underwent a major refurbishment. The hotel in question was looking to replace their air conditioning system during a peak period but the presence of guests meant a substitute system was imperative. Our temporary chiller was able to keep the hotel cool in the meantime and guaranteed business continuity for a major customer.
As well as comfort cooling, the video explains what to do if you need to cool larger areas including storage facilities, warehouses or film studios. A thermodynamic process occurs in each of above components of a chiller. The evaporator functions as a heat exchanger such that heat captured by the process coolant flow transfers to the refrigerant. As the heat-transfer takes place, the refrigerant evaporates, changing from a low-pressure liquid into vapor, while the temperature of the process coolant reduces.
The refrigerant then flows to a compressor, which performs multiple functions. First, it removes refrigerant from the evaporator and ensures that the pressure in the evaporator remains low enough to absorb heat at the correct rate.
Second, it raises the pressure in outgoing refrigerant vapor to ensure that its temperature remains high enough to release heat when it reaches the condenser. The refrigerant returns to a liquid state at the condenser. The latent heat given up as the refrigerant changes from vapor to liquid is carried away from the environment by a cooling medium air or water.
As described, two different cooling mediums air or water can facilitate the transfer of the latent heat given up as the refrigerant changes from vapor to liquid. Thus, chillers can use two different types of condensers, air-cooled and water-cooled. Water-cooled chillers feature a water-cooled condenser connected with a cooling tower. They have commonly been used for medium and large installations that have a sufficient water supply.
Water-cooled chillers can produce more constant performance for commercial and industrial air conditioning because of the relative independence to fluctuations of the ambient temperature. A typical water-cooled chiller uses recirculating condenser water from a cooling tower to condense the refrigerant.
A water-cooled chiller contains a refrigerant dependent on the entering condenser water temperature and flow rate , which functions in relation to the ambient wet-bulb temperature. Since the wet-bulb temperature is always lower than the dry-bulb temperature, the refrigerant condensing temperature and pressure in a water-cooled chiller can often operate significantly lower than an air-cooled chiller. Thus, water-cooled chillers can operate more efficiently.
Water-cooled chillers typically reside indoors in an environment protected from the elements. Hence, water-cooled chiller can offer a longer lifespan. Water-cooled chillers typically represent the only option for larger installations. The additional cooling tower system will require additional installation expense and maintenance as compared to air-cooled chillers. Air-cooled chillers rely on a condenser cooled by the environment air. Thus, air-cooled chillers may find common application in smaller or medium installations where space constraints may exist.
An air-cooled chiller can represent the most practical choice in scenarios where water represents a scarce resource. K It then enters into the expansion valve.
The expansion valve controls the flow of refrigerant, it measures the superheat on the suction line of the chiller and then reacts to this by allowing or restricting refrigerant flow to maintain a certain value. It enters, in this example, at a temperature of The refrigerant is expanded through a small orifice which sprays the refrigerant. It will leave at a temperature of 5. In this example, the chilled water is flowing through the evaporator at around The refrigerant is picking up thermal energy but the temperature only changes slightly which confuses many people.
The enthalpy and entropy will increase and this is where the energy is going. When the refrigerant leaves it will be a slightly superheated vapour at 5.
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