Publication

Study on the definition of dTmin for heat recovery

2010
Student Projects

Abstract

This project inserts itself in improving the understanding of the sensitivity of the dTmin against the parameters that influence it. It is also aimed at helping to improve OSMOSE, a platform designed for the study of energy conversions systems. Three economic criteria have been taken to achieve the heat integration optimization: the net present value, the yearly total cost and the payback period. This paper explores briefly several heat exchanger types and cost estimation models and presents then the program developed on Matlab and Octave for the optimization. The results are discussed, highlighting the fact that the payback period is not relevant for the evaluation of a project, and that the NPV, used by economists, should be considered. Two case studies are presented and compared, when we consider – for a varying heat load – the cold stream with an infinite mcp or the same mcp as the hot stream.

Official source

https://infoscience.epfl.ch/entities/publication/1f139986-be10-4d70-92a8-c2645e48e7d9

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2010
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1f139986-be10-4d70-92a8-c2645e48e7d9

About this result

Related concepts (32)

Heat exchanger

A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment.

Heat recovery ventilation

Heat recovery ventilation (HRV), also known as mechanical ventilation heat recovery (MVHR), is an energy recovery ventilation system that operates between two air sources at different temperatures. It's a method that is used to reduce the heating and cooling demands of buildings. By recovering the residual heat in the exhaust gas, the fresh air introduced into the air conditioning system is preheated (or pre-cooled), and the fresh air's enthalpy is reduced before it enters the room, or the air cooler of the air conditioning unit performs heat and moisture treatment.

Net present value

The net present value (NPV) or net present worth (NPW) applies to a series of cash flows occurring at different times. The present value of a cash flow depends on the interval of time between now and the cash flow. It also depends on the discount rate. NPV accounts for the time value of money. It provides a method for evaluating and comparing capital projects or financial products with cash flows spread over time, as in loans, investments, payouts from insurance contracts plus many other applications.

Related publications (32)

Study on the definition of dTmin for heat recovery

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