In this experimental study, only the standby mode was considered. In the standby mode, there is no forced water flow into or out of the tank. In the discharge mode, water flows from the storage tank through the distribution pipes to the faucets and cold city water enters the tank. In the charging mode, the tank receives energy from the solar collector. Heat losses from a storage tank and its plumbing fittings involve three different operating modes: charging, discharging and standby. This study is intended to address only that part of the problem that deals with the plumbing fittings attached to the tank. Unfortunately, this generalized formula does not adequately address temperature stratification both within the tank as well as in the ambient air surrounding the tank, non-uniform insulation jacket, thermal siphoning in the fluid lines attached to the tank, and plumbing fittings attached to the tank. National CategoryĮnergy Engineering Identifiers URN: urn:nbn:se:kth:diva-116461 OAI: oai:DiVA.= T.
Photovoltaic system, solar hot water system, TRNSYS, optimization, power, cost. given in the chapters where the terms are used: Auxiliary Heat Source Any other source of heat than solar heat to supply the system typically this is a boiler or an electric heater. SDHW Solar domestic hot water system SF Solar fraction SH Space heating. Place, publisher, year, edition, pages2012. Theoretical investigations including system simulations with TRNSYS showed for. Dumped power is the power which is produced and is not used by the system, in other hand the power from grid is the power that the user has to pay from available electricity grid around or it is the power that is not covered by the installed photovoltaic system.In other hand for the solar water heating system it was optimized so that throughout the year the load hot water temperature during the shower time in dormitory is between 39-40oC as recommended and at the same time the system is designed to work without an auxiliary heating to avoid extra cost with other kind of energy for the auxiliary heater.The goal of the systems optimization with TRNSYS is to have best gains without increasing the system and consequently reducing the high initial investment cost. Due to this a considerable dumped power were observed and it can be directed to the workshop during the day for the light and low power appliances. So to fulfill this goal it was important to monitor the simulation indicator of power coming from grid in order to reduce to zero, without increasing the batteries capacity. The results for the photovoltaic system were optimized in such way that the total power consumption comes totally from the system. These systems were simulated using TRNSYS software, a transient simulation program.In the modeling of those systems in TRNSYS all required components where represented by different Types. The school project is owned by a Germany mining company called Graphit Kropfmühl AG with graphite exploitation concession in Mozambique. Even in districts where are already connected to the national electric grid it is often observed cut off due to different kind of problems such as obsolete infrastructure, stealing of electric components and lack of alternative (back up) electric grid and resource.The aim of the present project is to design and simulate a stand-alone photovoltaic system and a solar water heating system for a projected training school in Ancuabe district at the Northern Province of Cabo Delgado. Due to the lack of fuel distributors the price of mentioned fossil fuels increases when moving away from the main three harbors (Nacala, Beira and Maputo) to the inland and many roads are not in good condition for driving fuel trucks. Mozambique is a country with some problems concerning the interconnection of electric grid and lack of local distributor of fossil fuels like GPL, gasoline and diesel in many districts.
2012 (English) Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits Student thesis Abstract