A desuperheater is known as a secondary heat exchanger device that transfers heat efficiently from the earth in the winter season and from your house in the summer, into your domestic hot water tank.
Desuperheaters are crucial components used in the thermal management of heat from power generation sources to industrial uses in Refrigeration and Air Conditioning.
When gas is used for heating or other heat transfer or in industrial processes, it is most efficient when saturated. It is a device that lowers the temperature of superheated gas so that it can be used efficiently for heating or for other industrial use. This gas temperature minimization is also called as attemperation, is performed by the desuperheater water heater (a device that injects a prescribed amount of water into a gas flow stream).
The general purpose, of this device is to provide effective and continuous heat transfer between gas and water. And a highly effective desuperheater application and design ensures that costly problems to be avoided, including general wear of downstream piping and equipment, long startup and shutdown times, and reduced process efficiency.
Desuperheater Working Principle/ Function:
The primary function of a desuperheater water heater is to minimize the temperature of superheated gas and other vapors. This temperature reduction is achieved by the process vapor being brought into direct contact with a liquid such as water. The injected water is then evaporated.
Maniks desuperheater is designed to work in a refrigeration system so it uses ammonia water inside to cool the refrigerant gas. When refrigerant gas in a refrigeration system is compressed in a compressor it passes though a condenser where it gives off heat and changes to a liquid state and then it passes through an expansion valve to an evaporator coil to absorb heat and change the refrigerant back to gaseous state for recompressing in the compressor to complete and the refrigeration cycle. This cycle is performed repeatedly in refrigeration systems.
The evaporator coil is positioned within a refrigerated box, display case, or cabinet and the heat absorbed by the refrigerant passing through the coil serves to extract heat from the refrigerated box and its contents to maintain the box at the desired temperature.
Desuperheater Design:
Double Walled “Tube in Tube “, vented, counter flow heat exchanger. Vent tube having serrations on inner & outer surfaces to avoid cross contamination of refrigerant and water/ fluid. Each tube has a tube inside that allows water/ fluid to travel in an opposite direction.
Desuperheater Installation:
The Maniks Desuperheater Water Heater is placed before the condenser and the oil separator. The ammonia refrigerant travels through the different tubes in to the lower the refrigerant temperature before entering the condenser. The Water heater is manufactured considering the hot water requirements for industrial processes. When the needs of refrigeration and hot water are not simultaneous, a “Recirculation” type system is provided in which hot water is generated, stored & maintained in a separate insulated tank. This stored hot water then can be utilized as and when required for future use.

Need of Desuperheater in Refrigeration
The basic principle of refrigeration is the evaporator transfers heat into the refrigerant the refrigerant transfer heat to the condenser then the condenser transfers heat to a cooling medium like water or outside air. The ultimate heat energy emitted from the refrigerators is wasted when it is transferred to the outside air this waste of energy is been avoided by using desuperheater.
Desuperheater absorbs the energy from condenser to utilize the same for other applications.

Advantages:

Maniks desuperheater has various advantages such as
• Efficient, evaporated cooling water adds to steam load
• Various types, configurations and sizes
• No moving parts hence low maintenance
• No special supports required
• No thermal liner required (except for emergency dump application)
Why Maniks Desuperheater?
Maniks is the most reputed Indian brand with a history of 30 years for manufacturing valves and other devices used in applications of Refrigeration and Air Conditioning. The company was started by Mr. Shekhar Kulkarni, an IIT Mumbai alumnus, with a vision to substitute imported products with Indian make products. The primary aim was to produce reliable products with excellent quality and service.