Developing of New Structure of Flat Plate Solar Water Heater and Method for Calculation and Design

Abstract

Abstract:Single pane glazed flat solar heaters found rather wide application for domestic hot water supply. However, the practice of use shows some discrepancy between estimated and observed data: in one case the temperature of hot water does not conform to the expected pattern, in other case doubts arise about correctness of their sizes, in some cases the quantity of heated water is not enough, etc. Because of such divergence of opinions, it is becoming necessary to think about correctness of existing methods of sizing and designing of flat plate solar water heaters. This article attempts to develop a new structure and improved method for calculation and design of flat plate solar water heaters. Analysis proved relatively higher energy and cost effectiveness of the new structure of flat plate solar water heater.

A Hidden Markov Model and Fuzzy Logic Forecasting Approach for Solar Geyser Water Heating

“…All the other parameters are predefined and by calculating the loss parameter as 3.638 × 10 −4 , resulting in 222.9333 kJ losses per hour. The heating period is calculated by how much energy needs to be added to the system with Q = mcΔT where m is the mass in litres of water, c = 4180 Joules per litre per °C [14] [34] and ΔT is the change in temperature in °C. The system requires some user input, as there required temperature for Figure 17 also illustrates the results between 10-90%, 50-50% and 60-40% weight that the highest number correct predictions were the sum of 50% historical and 50% previous seven days prediction as indicate with the red highlights.…”

“…Investigating the recordings, a suitable condition is found to be between 24 March 2018 00h30 to 03h30, where the ambient temperature dropped from 17.2 • C to 17.1 • C. All the other parameters are predefined and by calculating the loss parameter as 3.638 × 10 −4 , resulting in 222.9333 kJ losses per hour. The heating period is calculated by how much energy needs to be added to the system with Q = mc∆T where m is the mass in litres of water, c = 4180 Joules per litre per • C [14,34] and ∆T is the change in temperature in • C. The system requires some user input, as there required temperature for timeslot with prediction None, Small, Medium and High usage for a cold day, which is lower than 25 • C and a warm day. Pseudo code in Algorithms 4 and 5, illustrates the prediction, if the element must be switched on or off.…”

Developing of a ventilation system for residential houses with solar air heater

“…The system operates in the following way: the outside fresh air is taken through intake unit with air filter (1) passes through the air heating solar collector (2), where is heated up to temperature t v.in , o C and by the air circulating fan is blown into the air distribution ductwork (4). The warm air enters into rooms through inlet openings (6), inside polluted air is exhausted from rooms by exhausting duct (9) through inside air outlet openings (8).…”