Heat Integration of Absorption Heat Pump in a Milk Powder Dairy

2000 ◽  
Author(s):  
Jens Møller Andersen
Keyword(s):  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Milk Powder ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Heat Integration ◽  
Absorption Heat Pump ◽  
Absorption Cooling ◽  
Absorption Cooling System

Abstract Heat integration with absorption heat pumps requires investigation of many types of plant designs. In this article, it is concluded that in many cases high temperature absorption systems for heat recovery are more economically feasible than absorption systems for cooling purposes. The conclusion is based on a project where the scope was to investigate technical and economical possibilities for heat integration of an absorption heat pump in a milk powder plant. The first idea behind the project was to use the waste heat from the rejected air to drive an absorption cooling system to reduce the electricity consumption for cooling proposes. The model of the plant was based on simulations as a background for a time averaged COP model. It was concluded that an absorption system for generating low temperature steam is more feasible.

Optimization of a Coupled Vapor Compression and Absorption Cooling System Driven by Gas Fueled IC Engine

2011 ◽  
Author(s):  
Fady Atallah ◽  
Srikanth Madala ◽  
Suresh B. Sadineni ◽  
Robert F. Boehm
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Vapor Compression ◽  
Ic Engine ◽  
Cooling Cycle ◽  
Space Cooling ◽  
Absorption Cooling ◽  
Overall Efficiency ◽  
Gas Fueled ◽  
Absorption Cooling System

In recent years, due to the increased fossil fuel costs and environmental concerns, there has been a renewed interest in absorption cooling (using low-grade heat source) systems for refrigeration and space cooling applications. Although, the stand-alone coefficient of performance (COP) is a concern with such systems, absorption cooling can be a useful add-on that improves the overall efficiency of conventional vapor compression cooling cycle. A local company based in Las Vegas which is involved in the development of advanced HVAC technologies, has developed a natural gas fueled internal combustion (IC) engine driven heat pump. This system recovers the rejected heat from the IC engine during the heating cycle, thus, increasing the heat delivered and improving the system’s overall efficiency. However, during the cooling cycle the rejected heat is dissipated to the ambient air through radiators. The overall efficiency of the system can be improved if the heat rejected during the cooling cycle can be recovered and used for space cooling or refrigeration applications. In this study, a vapor compression refrigeration system coupled with an absorption cooling system is simulated using MATLAB. The vapor compression system is driven by a natural gas fueled IC engine and the waste heat from the engine is used to drive the absorption cooling system. The waste heat is recovered both from gas exhaust and engine cooling systems. The developed simulation model is used to find the transients of both the vapor absorption and compressions systems for varied cooling demands. Important parameters such as coolant temperature and exhaust gas temperature are obtained from experimental data. This paper presents the most efficient load distribution between the vapor compression and absorption cooling systems.

scholarly journals Economic Analysis of Heat Pump Recovery System for Circulating Water Waste Heat in Power Plant

2021 ◽  
Vol 256 ◽  
pp. 02011
Author(s):  
Ze Wang ◽  
Honghong Shen ◽  
Qunyin Gu ◽  
Daoyuan Wen ◽  
Gang Liu ◽  
...  
Keyword(s):  
Power Plant ◽  
Energy Saving ◽  
Heat Pump ◽  
Waste Heat ◽  
Heat Pumps ◽  
Water Saving ◽  
Absorption Heat Pump ◽  
Circulating Water ◽  
Cold Source ◽  
Heat Pump Unit

The use of heat pump technology to recover the waste heat of circulating water from the power plant instead of steam extraction for heating can not only improve the thermal efficiency of the unit and reduce the loss of cold source, but also has great advantages in energy saving. This paper uses absorption and compression heat pumps to recover the waste heat of circulating water in the power plant to study its energy-saving benefits. Under the same heating load, the economics of the two heat pumps are calculated and analyzed. The results show that the energy-saving benefits of absorption heat pump units are far greater than compression units. But in terms of water saving, the water saving capacity of the compression heat pump unit is higher than that of the absorption heat pump.

scholarly journals CFD ANALYSIS OF TEMPERATURE FIELD IN PELLET STOVE AS A GENERATOR OF AN ABSORPTION HEAT PUMP

2020 ◽  
pp. 163
Author(s):  
Marko Ilic ◽  
Velimir Stefanović ◽  
Saša Pavlović ◽  
Gradimir Ilić
Keyword(s):  
Temperature Field ◽  
Heat Pump ◽  
Waste Heat ◽  
Heat Pumps ◽  
Temperature Fields ◽  
Working Fluid ◽  
Comprehensive Overview ◽  
Absorption Heat Pump ◽  
Design And Optimization ◽  
The Balkans

The paper presents an initial CFD study on adopting the biomass-pellet usage in a generator of an absorption heat pump by obtaining the temperature field inside the biomass furnace. Contemporary absorption technologies are mostly based on the use of gas and other waste heat as a driving force in the Generator, where the two-component working fluid splits into the refrigerant and the absorbent. There are few or no absorption heat pumps that work directly on biomass - pellets. In the Balkans, biomass - pellets are a frequent and renewable source of thermal energy. The aim of this paper is to initially research the possibility of an absorption generator to work directly on available pellets. Following this idea, a comprehensive overview of contemporary absorption technology is given with a physical and mathematical model of the small pellet stove in FLUENT, which will be modified to adapt the generator. In the beginning, temperature fields are obtained by simulation inside the furnace and on its surfaces. Work showed that the temperature field has enough potential for triggering the absorption process as temperatures in the upper part of the stove are above 400°C at the heating capacity of around 13 kW up to 20 kW. The implemented work and the obtained results could serve as a useful reference for further design and optimization of the generator of AHP for direct Biomass utilization for a middle size system.

scholarly journals Waste heat utilisation for cogeneration of energy

Mechanik ◽  
2017 ◽  
Vol 90 (3) ◽  
pp. 254-256 ◽  
Author(s):  
Robert Zarzycki ◽  
Marcin Panowski
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Hot Water ◽  
Absorption Heat Pump ◽  
Start Up ◽  
Heat Demand

The paper shows the analysis of potential of absorption heat pump (APC) application to increase the efficiency of source energy conversion in the cogeneration power plant, by recuperation of waste heat from oil cooling system. In the presented case, the purpose of APC implementation was to eliminate the number of start up of pick hot water boilers. Obtained results showed that the waste heat may be utilised during the highest heat demand which may lead to delay or even avoiding the pick boiler start up, owing to absorption heat pump implementation.

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