Method for designing main equipment configuration of solar water heating project suitable for tropical zone

Abstract

The invention discloses a method for designing the main equipment configuration of a solar water heating project suitable for a tropical zone. In the method, a formula for calculating a heating gross area provided by a technical code for the application of the conventional national construction solar heating system is regulated, improved and innovated; a definiteness calculating method is improved into a random variable calculating method; and new methods for calculating a heater area and the capacity and configuration proportion of a water storage tank and an auxiliary heating device are respectively provided to realize the optimal rational matching of three pieces of main equipment of the solar heating project and achieve the win-win effects of saving both initial investment and operational energy consumption. Verified by examples, and compared with a scheme provided by a developer, a scheme for the capacity and configuration proportion of the three pieces of main equipment designed by the method can save investment by 20 percent at seaport and over 40 percent at Sanya and Xisha, and has the operational energy consumption which is only 1 / 3 that of other design schemes as the capacity of energy-consuming auxiliary equipment is reduced and over-produced hot water is fully utilized by preliminary estimation.

Description

Technical field: [0001] The invention relates to a new design method for the main equipment configuration of solar water heating projects in tropical areas, which is created on the basis of a major improvement on the formula for calculating the total heat collection area provided by the existing national building solar water heating system application technical specifications. One is to adjust the expression for calculating the total area of ​​the collector to the expression for calculating the amount of hot water produced by the collector, and the other is to change the meteorological data (radiation amount, ambient temperature) in the formula from a deterministic one-dimensional variable formula to a daily one The changing two-dimensional random variable formula, the third is that the user's daily average water consumption (design hot water load) is separated from the formula and becomes the benchmark value for comparison with the water production of the collector. Through m...

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Problems solved by technology

The solar hot water unit with this configuration is used in tropical Hainan, and there are the following problems: First, it does not reflect Hainan’s low latitude, high solar elevation angle, high solar radiation intensity and good thermal stability, high air temperature, high water temperature, The ground temperature is high and the annual temperature difference is small, there is no severe cold and heat, natural large greenhouses and other tropical meteorological characteristics. The engineering design copied the general model of the mainland, resulting in the phenomenon that the design capacity of the three main equipment is too large; the second is that the engineering components are unreasonable. Only the heat collector is calculated and determined according to the formula of the national standard, while the capacity of the water storage tank and auxiliary heating equipment is not calculated and determined by formula, which does not reflect the role of auxiliary functions in solar radiation heating; A new way to use solar hot water that saves investment, but it backfires. Not only the initial investment is higher than that in the mainland, but also the energy saving effect is not ideal, because in Hainan, which has a large natural greenhouse, hot water for bathing is not a must for people, but a icing on the cake , if the one-time investment is large or the use fee is too high, it will hinder its promotion and application, so there is a situation of popularization and application by the government and cold by the private sector

In short, solar energy is a typical meteorological product, but it does not reflect the tropical meteorological characteristics of Hainan

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