710252Solar & Heat assisted Passive Heat Recovery Ventilation with and Moisture Extraction (SHAP HRV) for existing and new buildingsClosedGRD Proof of ConceptInnovate UKAs new buildings are built to higher energy standards and become airtight, natural means of ventilation disappear. To overcome this, Mechanical Ventilation is used. Without Heat Recovery, 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 (three times more than a new fridge). In cases where gas heating is used Mechanical Heat Recovery Ventilation provides very little or no net CO2 saving. Besides the energy use, mechanical systems have high installation costs due to their complexity, require a number of trades to install and maintain, and suffer from component failures adding to the running costs which already average £100 per year. Mechanical systems also depend on a number of electronic and mechanical components contributing to lack of reliability, 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 stack effect and wind assistance), we have designed a reliable ventilation system for wet rooms which incorporates a number of inventions around passive extraction boost, extraction period extension, moisture withdrawal and simplified installation. The proposed system (SHAP HRV) both overcomes a number of challenges of wet room installations (such as lack of chimneys and dependable air extraction rates) and makes the product applicable to warmer climates, greatly increasing its export potential. The development of this technology will also allow us to provide a Green Deal ready full house system (using already developed PHRVUs for habitable rooms and SHAP HRVs for wet rooms), a proposition proffered by both BRE and LABC.