ducted air conditioning system

Commercial ducted air conditioning system and its working

The atmosphere contains a number of water particles in suspension, derived from the evaporation of water surfaces which takes place at all temperature. The amount of water particles held in suspension varies but is limited by the capacity of the air itself. At any given temperature the air can only hold a certain amount of[…]

Components and safety devices on HVAC refrigeration system

Industrial Compressor: The compressor is usually a reciprocating or a screw compressor. It provides the differential pressure and a necessary flow around the system by raising the refrigerant temperature and pressure thereby giving a desired mass flow rate. The purpose of the compressor in the refrigeration cycle is to accept the low-pressure dry gas from[…]

Refrigeration problems, causes and solution

Room temperature warm Lack of refrigerant present in the system. Blocked filter at the drier or expansion valve. Evaporator inlet solenoid closed. Condenser fan motor issue, less heat transfer available for a given mass of refrigerant. Defrosting element still operational. Compressor capacity control faulty leading to less coolant effect across the thermostatic expansion valve. Compressor[…]

Refrigerant R22, R134a, R410a, properties and applications

The ozone layer in our atmosphere provides a filter for ultraviolet radiation, which can be harmful to our health. Research has found that the ozone layer is thinning,   due to emissions into the atmosphere by the substance like chlorofluorocarbons (CFCs), HydroChloroFluoroCarbons (HCFC), halons and bromides. Montreal and Kyoto international protocols and elimination of the chlorine-containing CFC and HCFCs in new[…]

commercial refrigeration system

Working of commercial refrigeration system and safeties

Commercial refrigeration systems are heavily used in supermarkets and provision stores for storing a variety of foods, vegetables, and frozen products using multiple evaporators set at different temperatures. The control mechanism for commercial refrigeration system consists of thermostats, solenoid valve, a thermostatic expansion valve (TXV or TEV) and back pressure valve with safety devices LP cut[…]

Refrigeration cycle: HVAC system basics and refrigerant charging

The Refrigeration cycle (HVAC refrigeration system) and its 5 essential parts: Compressor. Condenser. Thermostatic expansion valve (TXV or TEV) or Metering Device. Evaporator. Piping C → D: low-pressure vapor refrigerant flows into the compressor suction and discharges into compressed high-pressure vapor. D → A: pressurized refrigerant vapor condenses in the liquid state at constant pressure,[…]