Production d'eau chaude domestique dans les maisons a consommation energetique nette zero.

摘要

The objective of this masters thesis is to examine various ways of producing domestic hot water (DHW) which maximize the renewable fraction by reducing the use of nonrenewable resources. This study focuses on grey water heat recovery through the use of a Gravity Film heat eXchanger (GFX), desuperheaters of geothermal heat pumps and solar energy production through themml solar panels.; The TRNSYS software is used to simulate the configurations analyzed. New models for desuperheaters and the GFX have been developed for this study. A natural convection heat exchanger (NCHE) model, based on studies performed at Queen's University, has also been used. Finally, domestic hot water profiles for different draw categories are produced for one-minute time steps using the DHW-calc program.; The results in this thesis are divided in two parts. In the first part, different combinations of GFX and solar domestic hot water systems are investigated. In the second part, different configurations of domestic hot water systems for a net zero energy triplex are simulated.; Results indicate that the GFX recuperates the maximum amount of energy when it preheats all the water used in the showers. When combined to a solar system, the highest renewable fraction is achieved when the cold water used in the showers is preheated by the GFX.; Adding a GFX to a classical DHW production system reduces the storage volume required. It also increases the threshold at which the flow rate to showers becomes "uncomfortable".; For the thermal solar systems, the results show that: (i) an increase in the collector surface increases the renewable fraction; (ii) for small storage volumes, the optimal azimuth of the solar panels is displaced to the as (iii) an increase in the domestic hot water demand reduces the renewable fraction.; For the net zero energy triplex, the DHW production system is composed of a GFX, desuperheaters from the three geothermal heat pumps and a solar system. The excess energy produced by the oversized solar collectors can be recovered by installing a second reservoir and selling it to neighbours. The DHW production can then yield a renewable fraction greater than 1. Finally, NCHEs are investigated for groups of reservoirs installed in parallel or in series. The results show that a renewable fraction greater than 1 is only possible for the series arrangement.