Solar & Heat assisted Passive Heat Recovery Ventilation with and Moisture Extraction (SHAP HRV) for existing and new buildings

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As new buildings are built to higher energy standards and become airtight, natural means ofventilation disappear. To overcome this, Mechanical Ventilation is used. Without HeatRecovery, this leads to up to 5,000 kWh of heat loss from a typical home per year. In order to‘reclaim’ this energy, Heat Recovery is added, with some models claiming 90% efficiency.With two fans running, 24h a day, the system uses up to 900kWh of electricity per year (threetimes more than a new fridge). In cases where gas heating is used Mechanical Heat RecoveryVentilation provides very little or no net CO2 saving.Besides the energy use, mechanical systems have high installation costs due to theircomplexity, require a number of trades to install and maintain, and suffer from componentfailures adding to the running costs which already average £100 per year. Mechanical systemsalso depend on a number of electronic and mechanical components contributing to lack ofreliability, resource depletion and electronic waste.Starting off with our innovative and retrofit specific Passive Heat Recovery Ventilation Unit(initially developed with the help of TSB funded feasibility study and utilising passive stackeffect and wind assistance), we have designed a reliable ventilation system for wet roomswhich incorporates a number of inventions around passive extraction boost, extraction periodextension, moisture withdrawal and simplified installation.The proposed system (SHAP HRV) both overcomes a number of challenges of wet roominstallations (such as lack of chimneys and dependable air extraction rates) and makes theproduct applicable to warmer climates, greatly increasing its export potential. Thedevelopment of this technology will also allow us to provide a Green Deal ready full housesystem (using already developed PHRVUs for habitable rooms and SHAP HRVs for wetrooms), a proposition proffered by both BRE and LABC.