Solar cooling in Madrid: Available solar energy

Journal Article · Tue Nov 01 00:00:00 EST 1994 · Solar Energy (Journal of Solar Energy Science and Engineering); (United States)

DOI:https://doi.org/10.1016/0038-092X(94)90058-2· OSTI ID:6775987

Izquierdo, M; Hernandez, F; Martin, E ^[1]

---

1. Instituto de Ciencias de la Construccion Eduardo Torroja, Madrid (Spain)

This paper analyzes the behaviour of an absorption chiller lithium bromide installation fed by a field of flat-plate solar collectors and condensed by swimming pool water. A method of calculation in a variable regime is developed in terms of the obtained experimental results. Starting from the meteorological variables of a clear summer day and from the project data (collector normalization curve, collector and installation mass), the minimum solar radiation level necessary to initiate the process, I[sub min], and the instantaneous available solar energy, Q[sub u] + W[sub 1] is determined. The solar radiation threshold, I[sub min], necessary to obtain the process temperature, t[sub ave], in each instant, is obtained by adding to the corrected Klein radiation threshold, I[sub k,c], the heat capacity effects of the collector, HCE[sub CO], and of the installation, HCE[sub ins], as well as the losses of heat of the pipes to the surroundings, Q[sub 1]. The instantaneous available solar energy, available useful heat, in addition to the wind collector losses to the surroundings, Q[sub u] + W[sub 1], is the difference, in each instant, between the radiation, I[sub g1T], and the radiation threshold, I[sub min].The integration during the day of the instantaneous available solar energy allows us to calculate the daily available function, H[sub T]. The value of H[sub T], measured in the swimming-pool water condensation installation reached 6.92 MJ/(m[sup 2] day ). The calculated values of H[sub T] for a conventional installation condensed by tower water, or air, have been 6.35 and 0.56 MJ/(m[sup 2] day). respectively.

• OSTI ID: 6775987
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 53:5; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
SOLAR COOLING SYSTEMS
ENERGY EFFICIENCY
NUMERICAL ANALYSIS
SOLAR ENERGY
SEASONAL VARIATIONS
FLAT PLATE COLLECTORS
EFFICIENCY
ENERGY
ENERGY SOURCES
EQUIPMENT
MATHEMATICS
RENEWABLE ENERGY SOURCES
SOLAR COLLECTORS
SOLAR EQUIPMENT
VARIATIONS
140901* - Solar Thermal Utilization- Space Heating & Cooling
141000 - Solar Collectors & Concentrators