Provent d.o.o. Pod lipami Komenda, Slovenija Tel.: Fax:

Transcription

1 Provent d.o.o. Pod lipami Komenda, Slovenija Tel.: Fax: info@provent.si COMPARISON OF KITCHEN VENTILATION SYSTEMS WITH AIR-HEAT RECOVERY a) Ventilation system with Media energy-saving kitchen hood with plate heat exchangers b) Ventilation system with a classic exhaust hood and a separate ventilation device with heat recovery

2 KEY COMPONENTS OF INDIVIDUAL SYSTEMS The exhaust part of the ventilation system with plate heat exchangers built into the kitchen hood 1 Labyrinth and metal mesh filters in the hood 2 Heat exchangers in the hood* 3 Exhaust channel 4 Exhaust fan * The plate heat exchangers of smaller dimensions can be washed just like filters in a dishwasher. The exhaust part of the ventilation system with heat exchanger in the ventilation device 1 Labyrinth and metal mesh filters in the hood 2 UV lamps* 3 UV lamps' control system 4 Exhaust channel 5 Exhaust filter in the ventilation device 6 Heat exchanger 7 Exhaust fan * UV lamps present the minimum additional filtration in order to protect the ventilation device with a heat exchanger against the oil particles found in the exhaust air. Four main parts (three mechanical and one electric) reliable operation with a long lifespan. Low cleaning and maintenance costs of the system. Seven main parts (four mechanical and three electric) smaller reliability of operation and shorter lifespan. High cleaning and maintenance costs of the system.

3 CONSEQUENCES OF INSUFFICIENT MAINTENANCE Media energy-saving kitchen hood with plate heat exchangers What can happen in case of disregarding the washing of the heat exchanger? The plate heat exchanger, through which a lot of grease from baking was transferred, that has not been washed for a year. Ventilation system with heat exchanger in the ventilation device What can happen in the case of disregarding the cleaning and maintenance of the UV lamps' system? A relatively new ventilation device, where the grease has leaked inside it. The reason may be found in the inadequate cleaning of the UV lamps, a broken UV light bulb, or a failure of the UV lamps' control system. As early as after the first washing in a dishwasher, the grease is removed almost completely (crosssection of the exchanger). The exhaust channel after the hood is very clean, as the filtration efficiency has not changed despite filters and exchangers not being cleaned suitably. Predictable defilement and, therefore, the fire safety of the exhaust channel system with an exhaust fan. Unpredictable defilement and, therefore, the fire safety of the exhaust channel system with a ventilation device.

4 CLEANING AND MAINTENANCE COSTS Types of cleaning and maintenance costs for the same function of air-heat recovery Media energy-saving kitchen hood with plate heat exchangers 1. Washing of the plate heat exchangers in the dishwasher. Ventilation system with heat exchanger in the ventilation device 1. Cleaning of the UV lamps. 2. Replacement of broken UV lamps. 3. Maintenance of the UV lamps' control system. 4. Replacement of the filters located before the ventilation device with the air-heat exchanger. 5. Periodical cleaning of the air-heat exchanger found inside the ventilation device. Washing of the plate heat exchangers is a fairly simple job, so it can be done by the kitchen's personnel. Washing, cleaning and maintenance of the filtration system and ventilation device with the air-heat exchanger are complex jobs, which require special care by specialists.

5 ENERGY COST Thermal energy cost intended for heating and electric energy cost for the running of the fans. Thermal energy cost intended for heating and electric energy cost for the running of the fans. Projected air flow 5000 m3/h, operating time 12 hours a day, 7 days a week, average daily temperature during the heating time 5 0 C, price of thermal energy 0.09 EUR/kWh, price of electric energy 0.15 EUR/kWh EUR EUR EUR Energy cost EUR EUR 0 EUR Years of operation Larger costs of investment into the System Media are often covered within 3 years of the system's operation. In the following years, there are approximately 80,000 Euros of savings!!!

6 ENERGY COST Thermal energy cost intended for heating and electric energy cost for the running of the fans. Thermal energy cost intended for heating and electric energy cost for the running of the fans. Projected air flow 5000 m3/h, operating time 12 hours a day, 7 days a week, average daily temperature during the heating time 5 0 C, price of thermal energy 0.09 EUR/kWh, price of electric energy 0.15 EUR/kWh EUR Energy cost EUR EUR EUR 0 EUR Years of operation The kitchen ventilation system with air-heat exchanger in the ventilation device usually does not have the automatic air-flow control system depending on the cooking intensity, which is a part of the standard offer for the Media energy-saving kitchen hood. Therefore, it has much higher energy costs.