Waste Heat Recovery

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  • Topic: HVAC, Heat pump, Heating, ventilating, and air conditioning
  • Pages : 8 (1761 words )
  • Download(s) : 537
  • Published : September 22, 2011
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HEAT TRANSFER
HEAT TRANSFER
 
 
 
 
UTILISATION OF WASTE HEAT FROM AN   AIR –CONDITIONING SYSTEM  
 
 
 
 
 
By,
S.R.SAIRAM
(klnsairam@gmail.com)
9894221747
 
B.N.SRI VAISHNAV
(vaishnav2050@gmail.com)
9994231944
 
 
 
 
KLN COLLEGE OF ENGINEERING
POTTAPALAYAM
UTILISATION OF WASTE HEAT FROM AN AIR –CONDITIONING SYSTEM                                                                                                                                                     

ABSTRACT
 
                           Energy is an important unit for development. India is a developing country. Energy needs of various sectors have increased rapidly. In the present energy crisis scenario, many people think in terms of alternate energy sources and conservation methodologies. In the context of great uncertainty over future energy supplies, attention is being paid to the potential for energy conservation it is imperative that a serious and concrete effort should be launched for conserving energy through waste heat recovery. Air conditioning units are designed to remove heat from interior spaces and reject it to the ambient air. While this heat is of low grade variety it still represents wasted energy. From an energy conservation point standpoint it would be desirable to reclaim this heat in a usable form. The best and most obvious form of heat recovery is for heating water. The main objective of this paper is experimental analysis of waste heat recovery system and its use for hot water generation and also saving the high-grade energy electricity from low-grade hot water production application.  

 
Key words:  Energy needs, Energy conservation, Waste heat utilization, low grade energy,                                                     high grade energy ,payback period.               
 
 
 
 
 
 
 
 
 
 
 
INTRODUCTION
             Energy conservation is now faced with the challenge of applying the latest technology for facilities and improvements, which can be justified on its own merits. In the present world energy scenario, energy management plays an important role.   Under these circumstances, energy conservation is the technique to be adopted to face the energy crisis. Air conditioning units are designed to remove heat from interior spaces and reject it to the outside air. Heat rejection may occur directly to the air, as in the case of most conventional air source units or to water circulating from a cooling tower. The circulating water eventually rejects the heat to the ambient air in the cooling tower. While this heat is of low grade variety, it still represents wasted energy. From an energy conservation point of view, it would be desirable to reclaim this heat in a usable form. The best and most obvious form of heat recovery is for heating water  

WASTE HEAT RECOVERY
              Waste heat is defined as the heat which is rejected from a process at a temperature high enough, above the ambient temperature to permit the extraction of additional value from it. It is generally available in the form of waste steam, Flue gases form boilers and vapors hot condensate from refrigeration and air conditioners etc. A one ton air conditioning unit running for twelve hours a day liberate around 6*105kj of heat /day. This heat which is normally discarded outside can be recaptured and can be utilized to provide free hot water.  

SYSTEM DESCRIPTION
 
Vapor compression refrigeration is the primary method used to provide mechanical cooling. All vapor compression systems consist of four basic components: Evaporator, condenser, compressor and an expansion device (Fig 1). The evaporator and condenser are heat exchangers that evaporate and condense the refrigerant while absorbing and rejecting heat. The compressor takes the refrigerant vapors from the evaporator and raises the pressure sufficiently for the vapor to condense in the condenser. The expansion device controls the flow of...
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