Dépouillements

Sorption heat pumping technologies: Comparisons and challenges in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 566-576 Titre : Sorption heat pumping technologies: Comparisons and challenges Titre original : Technologies des pompes à chaleur à sorption : comparaisons et défis Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 566-576 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur; Système à sorption; Comparaison; Enquête; Thermodynamique; Efficacité Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Heat pumping devices which are operating on sorption effects comprise at least two times two categories, namely liquid or solid sorption cycles on the one hand, and open or closed cycles on the other hand. For the benefit of energy saving and the environment as well as for the further development of the technology it is important to be able to compare and evaluate these options in the context of the respective application. Some ideas to this end are shown in this paper. First the meaning of temperatures and humidity for the difference between open and closed systems is discussed, and there are a lot of similarities. Then some differences between solid and liquid sorption which are especially important for the question of minimum operating temperature and part load behavior are being reviewed, and we find that there is something to learn, mutually. Finally the consequences of solar fraction, auxiliary power consumption, and cogeneration efficiency are being highlighted, in order to check the perception of sorption systems to be environmentally benign. These consequences are important for all kinds of sorption cooling systems. It can be expected that there are significant improvements in the efficiency of power plants and compression cooling systems; consequently we find that sorption technology must improve its performance considerably also in order to stay competitive. [article] Sorption heat pumping technologies: Comparisons and challenges = Technologies des pompes à chaleur à sorption : comparaisons et défis [texte imprimé] . - 2012 . - pp. 566-576. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 566-576 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur; Système à sorption; Comparaison; Enquête; Thermodynamique; Efficacité Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Heat pumping devices which are operating on sorption effects comprise at least two times two categories, namely liquid or solid sorption cycles on the one hand, and open or closed cycles on the other hand. For the benefit of energy saving and the environment as well as for the further development of the technology it is important to be able to compare and evaluate these options in the context of the respective application. Some ideas to this end are shown in this paper. First the meaning of temperatures and humidity for the difference between open and closed systems is discussed, and there are a lot of similarities. Then some differences between solid and liquid sorption which are especially important for the question of minimum operating temperature and part load behavior are being reviewed, and we find that there is something to learn, mutually. Finally the consequences of solar fraction, auxiliary power consumption, and cogeneration efficiency are being highlighted, in order to check the perception of sorption systems to be environmentally benign. These consequences are important for all kinds of sorption cooling systems. It can be expected that there are significant improvements in the efficiency of power plants and compression cooling systems; consequently we find that sorption technology must improve its performance considerably also in order to stay competitive.

A basis for the development of new ammonia–water–sodium hydroxide absorption chillers in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 577-587 Titre : A basis for the development of new ammonia–water–sodium hydroxide absorption chillers Titre original : Fondement du développement de nouveaux refroidisseurs à ammoniac/eau/hydroxyde de sodium Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 577-587 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à absorption; Ammoniac-eau; Enquête; Amélioration; Additif; Hydroxyde; Sodium; Simulation; Performance; COP Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Adding NaOH to ammonia/water improves the separation of ammonia in the generator and reduces both chiller driving temperature and rectification losses. In this paper the main disadvantages for the implementation of these new mixtures are addressed: a) few experimental data or reliable correlations of the fluid mixture properties exist; b) selection of an adequate system for separating the hydroxide; and c) evaluation of potential corrosion problems. Our results show that the separation of NaOH from an ammonia/water solution with a maximum approximate mass fraction of 0.05 (5% weight) is viable when reverse osmosis is used with membranes BW30 and SW30HR LE. Cycle simulation using experimental data to calculate the vapour–liquid equilibrium properties shows that the COP is approximately 20% higher than with a conventional ammonia/water chiller working under the same conditions and using a hydroxyl separation efficiency of 99% for NaOH, which is feasible according to the experimental tests. [article] A basis for the development of new ammonia–water–sodium hydroxide absorption chillers = Fondement du développement de nouveaux refroidisseurs à ammoniac/eau/hydroxyde de sodium [texte imprimé] . - 2012 . - pp. 577-587. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 577-587 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à absorption; Ammoniac-eau; Enquête; Amélioration; Additif; Hydroxyde; Sodium; Simulation; Performance; COP Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Adding NaOH to ammonia/water improves the separation of ammonia in the generator and reduces both chiller driving temperature and rectification losses. In this paper the main disadvantages for the implementation of these new mixtures are addressed: a) few experimental data or reliable correlations of the fluid mixture properties exist; b) selection of an adequate system for separating the hydroxide; and c) evaluation of potential corrosion problems. Our results show that the separation of NaOH from an ammonia/water solution with a maximum approximate mass fraction of 0.05 (5% weight) is viable when reverse osmosis is used with membranes BW30 and SW30HR LE. Cycle simulation using experimental data to calculate the vapour–liquid equilibrium properties shows that the COP is approximately 20% higher than with a conventional ammonia/water chiller working under the same conditions and using a hydroxyl separation efficiency of 99% for NaOH, which is feasible according to the experimental tests.

Modelling of an adsorption chiller for dynamic system simulation in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 588-595 Titre : Modelling of an adsorption chiller for dynamic system simulation Titre original : Modélisation d'un refroidisseur à adsorption pour un système dynamique de simulation Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 588-595 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à adsorption; Modélisation; Simulation; Performance; Paramètre; Matériau; Adsorbant Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Adsorption chillers are periodically working chillers with fast temperature changes at the outlets of the hydraulic loops at the beginning of a new adsorption cycle. The scope of the current study is to predict the consequences of these temperature changes for the components in the hydraulic system in order to optimize the system's design. Therefore, a model of an adsorption chiller has been created in the object-oriented simulation language Modelica. The model follows a component approach for each part of the chiller based on fundamental equations for heat and mass transfer. Compared to an effective model all equations have a physical significance. Simulation results are validated by measurement values coming from an adsorption chiller tested. Measured temperatures and volume flows at the inlet of the hydraulic loops are given as input to the simulation model. The simulated output temperatures show good agreement with measured temperatures, heating and cooling power and coefficient of performance (COP). [article] Modelling of an adsorption chiller for dynamic system simulation = Modélisation d'un refroidisseur à adsorption pour un système dynamique de simulation [texte imprimé] . - 2012 . - pp. 588-595. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 588-595 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à adsorption; Modélisation; Simulation; Performance; Paramètre; Matériau; Adsorbant Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Adsorption chillers are periodically working chillers with fast temperature changes at the outlets of the hydraulic loops at the beginning of a new adsorption cycle. The scope of the current study is to predict the consequences of these temperature changes for the components in the hydraulic system in order to optimize the system's design. Therefore, a model of an adsorption chiller has been created in the object-oriented simulation language Modelica. The model follows a component approach for each part of the chiller based on fundamental equations for heat and mass transfer. Compared to an effective model all equations have a physical significance. Simulation results are validated by measurement values coming from an adsorption chiller tested. Measured temperatures and volume flows at the inlet of the hydraulic loops are given as input to the simulation model. The simulated output temperatures show good agreement with measured temperatures, heating and cooling power and coefficient of performance (COP).

Solar heating and cooling system with absorption chiller and low temperature latent heat storage: Energetic performance and operational experience in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 596-606 Titre : Solar heating and cooling system with absorption chiller and low temperature latent heat storage: Energetic performance and operational experience Titre original : Système de chauffage et de conditionnement d'air à base d’une machine frigorifique à absorption et d’un stockage de chaleur latente à basse température : performance énergétique et résultats opérationnels Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 596-606 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : conditionnement d'air; système à absorption; chauffage; énergie solaire; expérimentation; accumulation thermique; matériau; changement de phase - performance Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Absorption cooling systems based on water/lithium bromide (LiBr) solution typically require an open wet cooling tower to transfer the reject heat to the ambient. Yet, water consumption, the need for water make-up and cleaning, formation of fog, and the risk of Legionella bacteria growth are hindering factors for the implementation of small solar cooling systems. The application of a latent heat storage supporting the heat rejection of the absorption chiller in conjunction with a dry cooling system allows eliminating the wet cooling tower. By that means heat rejection of the chiller is shifted to periods with lower ambient temperatures, i.e. night time or off-peak hours. The system concept and the hydraulic scheme together with an analysis of the energetic performance of the system are presented, followed by a report on the operation of a first pilot installation. [article] Solar heating and cooling system with absorption chiller and low temperature latent heat storage: Energetic performance and operational experience = Système de chauffage et de conditionnement d'air à base d’une machine frigorifique à absorption et d’un stockage de chaleur latente à basse température : performance énergétique et résultats opérationnels [texte imprimé] . - 2012 . - pp. 596-606. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 596-606 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : conditionnement d'air; système à absorption; chauffage; énergie solaire; expérimentation; accumulation thermique; matériau; changement de phase - performance Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Absorption cooling systems based on water/lithium bromide (LiBr) solution typically require an open wet cooling tower to transfer the reject heat to the ambient. Yet, water consumption, the need for water make-up and cleaning, formation of fog, and the risk of Legionella bacteria growth are hindering factors for the implementation of small solar cooling systems. The application of a latent heat storage supporting the heat rejection of the absorption chiller in conjunction with a dry cooling system allows eliminating the wet cooling tower. By that means heat rejection of the chiller is shifted to periods with lower ambient temperatures, i.e. night time or off-peak hours. The system concept and the hydraulic scheme together with an analysis of the energetic performance of the system are presented, followed by a report on the operation of a first pilot installation.

Experimental boiling heat transfer coefficients in the high temperature generator of a double effect absorption machine for the lithium bromide/water mixture in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 627-637 Titre : Experimental boiling heat transfer coefficients in the high temperature generator of a double effect absorption machine for the lithium bromide/water mixture Titre original : Coefficients de transfert de chaleur expérimentaux lors de l'ébullition dans le générateur haute température d'une machine à absorption au bromure de lithium à double effet Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 627-637 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à absorption; Eau-bromure de lithium; Expérimentation; Coefficient de transfert de chaleur; Ébullition; Échangeur à plaques; Désorption Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The aim of this work is to determine the boiling heat transfer coefficients in the high temperature desorber (HTD) of an air-cooled double effect lithium bromide/water absorption prototype. The HTD is a plate heat exchanger (PHE) with thermal oil on one side, and a lithium bromide solution on the other side. Several experiments were performed with this PHE while the prototype was working with an outdoor dry bulb temperature around 42 °C and condensation temperature around 55 °C. The registered data allowed to calculate the global heat transfer coefficient and the heat transfer coefficient for the LiBr/water mixture in forced convective boiling. The pressure drop produced by the boiling of the refrigerant has been calculated as well. It has been verified that the largest part of the heat supplied in the generator is required for desorbing the refrigerant (except for the maximum solution mass flow), while the sensible heat varies from 10% to 50% of the total heat supplied. [article] Experimental boiling heat transfer coefficients in the high temperature generator of a double effect absorption machine for the lithium bromide/water mixture = Coefficients de transfert de chaleur expérimentaux lors de l'ébullition dans le générateur haute température d'une machine à absorption au bromure de lithium à double effet [texte imprimé] . - 2012 . - pp. 627-637. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 627-637 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à absorption; Eau-bromure de lithium; Expérimentation; Coefficient de transfert de chaleur; Ébullition; Échangeur à plaques; Désorption Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The aim of this work is to determine the boiling heat transfer coefficients in the high temperature desorber (HTD) of an air-cooled double effect lithium bromide/water absorption prototype. The HTD is a plate heat exchanger (PHE) with thermal oil on one side, and a lithium bromide solution on the other side. Several experiments were performed with this PHE while the prototype was working with an outdoor dry bulb temperature around 42 °C and condensation temperature around 55 °C. The registered data allowed to calculate the global heat transfer coefficient and the heat transfer coefficient for the LiBr/water mixture in forced convective boiling. The pressure drop produced by the boiling of the refrigerant has been calculated as well. It has been verified that the largest part of the heat supplied in the generator is required for desorbing the refrigerant (except for the maximum solution mass flow), while the sensible heat varies from 10% to 50% of the total heat supplied.

Solar sorption cooling systems for residential applications: Options and guidelines in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 638-660 Titre : Solar sorption cooling systems for residential applications: Options and guidelines Titre original : Systèmes de refroidissement à sorption solaire pour les applications résidentielles : options et recommandations Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 638-660 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Conditionnement d'air; Refroidisseur; Système à adsorption; Eau; Gel de silice; Ammoniac–eau; Enquête; Énergie solaire; Immeuble d'habitation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Solar powered sorption cooling systems have been researched and demonstrated in recent years, which contain adsorption cooling, absorption cooling and desiccant cooling. The various typical systems with small scale for potential residential applications are discussed and analyzed, in which the working principals, system suitability for solar cooling, performance, maintenance and economic viability have been discussed in this paper. With such analyses and the available real operation systems, the detailed options and guidelines of solar cooling for residential applications are shown. [article] Solar sorption cooling systems for residential applications: Options and guidelines = Systèmes de refroidissement à sorption solaire pour les applications résidentielles : options et recommandations [texte imprimé] . - 2012 . - pp. 638-660. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 638-660 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Conditionnement d'air; Refroidisseur; Système à adsorption; Eau; Gel de silice; Ammoniac–eau; Enquête; Énergie solaire; Immeuble d'habitation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Solar powered sorption cooling systems have been researched and demonstrated in recent years, which contain adsorption cooling, absorption cooling and desiccant cooling. The various typical systems with small scale for potential residential applications are discussed and analyzed, in which the working principals, system suitability for solar cooling, performance, maintenance and economic viability have been discussed in this paper. With such analyses and the available real operation systems, the detailed options and guidelines of solar cooling for residential applications are shown.

Optimal adsorbent for adsorptive heat transformers: Dynamic considerations in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 675-686 Titre : Optimal adsorbent for adsorptive heat transformers: Dynamic considerations Titre original : Transformateurs de chaleur à adsorption : adsorbant optimal et aspects dynamiques Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 675-686 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à adsorption; Transformateur de chaleur; Enquête; Adsorbant; Diffusivité; Transfert de chaleur; Transfert de masse Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Kinetic properties of the adsorbent can strongly affect dynamics of an adsorptive heat transformer. In this paper we describe a current methodology and start discussing a new approach for dynamic characterization and optimization of the system “adsorbent-heat exchanger” under conditions typical for heat transformation. Effect of the adsorbent nature, its grain size, residual non-adsorbable gas, heating rate, local shape of adsorption isobar on the adsorption dynamics and specific cooling (heating) power was studied for promising adsorbents of water (Fuji silica RD, FAM-Z02, SWS-1L). Based on these results some demands to an adsorbent optimal from the dynamic point of view have been discussed. [article] Optimal adsorbent for adsorptive heat transformers: Dynamic considerations = Transformateurs de chaleur à adsorption : adsorbant optimal et aspects dynamiques [texte imprimé] . - 2012 . - pp. 675-686. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 675-686 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système à adsorption; Transformateur de chaleur; Enquête; Adsorbant; Diffusivité; Transfert de chaleur; Transfert de masse Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Kinetic properties of the adsorbent can strongly affect dynamics of an adsorptive heat transformer. In this paper we describe a current methodology and start discussing a new approach for dynamic characterization and optimization of the system “adsorbent-heat exchanger” under conditions typical for heat transformation. Effect of the adsorbent nature, its grain size, residual non-adsorbable gas, heating rate, local shape of adsorption isobar on the adsorption dynamics and specific cooling (heating) power was studied for promising adsorbents of water (Fuji silica RD, FAM-Z02, SWS-1L). Based on these results some demands to an adsorbent optimal from the dynamic point of view have been discussed.

Application of waste heat powered absorption refrigeration system to the LNG recovery process in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 687-694 Titre : Application of waste heat powered absorption refrigeration system to the LNG recovery process Titre original : Système frigorifique à absorption entraîné par la chaleur récupérée : application dans le processus de récupération du GNL Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 687-694 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : GNL; Liquéfaction; Vapeur; Système à absorption; Ammoniac-eau; Récupération de chaleur; Cogénération; Turbine à gaz Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The recovery process of the liquefied natural gas requires low temperature cooling, which is typically provided by the vapor compression refrigeration systems. The usage of an absorption refrigeration system powered by waste heat from the electric power generating gas turbine could provide the necessary cooling at reduced overall energy consumption. In this study, a potential replacement of propane chillers with absorption refrigeration systems was theoretically analyzed. From the analysis, it was found that recovering waste heat from a 9 megawatts (MW) electricity generation process could provide 5.2 MW waste heat produced additional cooling to the LNG plant and save 1.9 MW of electricity consumption. Application of the integrated cooling, heating, and power is an excellent energy saving option for the oil and gas industry. [article] Application of waste heat powered absorption refrigeration system to the LNG recovery process = Système frigorifique à absorption entraîné par la chaleur récupérée : application dans le processus de récupération du GNL [texte imprimé] . - 2012 . - pp. 687-694. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 687-694 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : GNL; Liquéfaction; Vapeur; Système à absorption; Ammoniac-eau; Récupération de chaleur; Cogénération; Turbine à gaz Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The recovery process of the liquefied natural gas requires low temperature cooling, which is typically provided by the vapor compression refrigeration systems. The usage of an absorption refrigeration system powered by waste heat from the electric power generating gas turbine could provide the necessary cooling at reduced overall energy consumption. In this study, a potential replacement of propane chillers with absorption refrigeration systems was theoretically analyzed. From the analysis, it was found that recovering waste heat from a 9 megawatts (MW) electricity generation process could provide 5.2 MW waste heat produced additional cooling to the LNG plant and save 1.9 MW of electricity consumption. Application of the integrated cooling, heating, and power is an excellent energy saving option for the oil and gas industry.

Indoor temperature variations resulting from solar desiccant cooling in a building without thermal backup in Revue internationale du froid, vol 32, issue 4 (2009)

Public ISBD [article]  inRevue internationale du froid > vol 32, issue 4 (2009) . - pp. 695-704 Titre : Indoor temperature variations resulting from solar desiccant cooling in a building without thermal backup Titre original : Variations de la température intérieure dans un immeuble refroidi par un système à déshydratant solaire sans source d'énergie thermique supplémentaire Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 695-704 Langues : Anglais (eng) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Conditionnement d'air; Système à déshydratant; Énergie solaire; Bureau; Modélisation; Simulation; Température; Performance Index. décimale : 621.5 Technique pneumatique, du vide, des basses températures Résumé : The performance of a once-through solar desiccant cooling system, for air-conditioning a commercial office space, was modelled using the TRNSYS computer simulation software package. The study particularly focused on the potential for designing and operating a desiccant cooling system, without any thermal backup provided to mitigate for intermittent solar availability in three Australian cities. Increasing (i) indirect evaporative cooler effectiveness, (ii) air flow to the office space, and (iii) solar collector area were all shown to reduce the frequency of high temperature events inside the building occupied space. In the warm temperate climate of Melbourne (and to a lesser extent Sydney), high ventilation rates enabled comfort conditions to be maintained at or near acceptable levels in the occupied space, without the use of a backup thermal source. The synergy between evaporative cooling and solar desiccant cooling, observed in the warm temperate climates, was not evident in the tropical Darwin climate, suggesting that the selected ventilation desiccant cooling cycle is not appropriate for tropical climates. [article] Indoor temperature variations resulting from solar desiccant cooling in a building without thermal backup = Variations de la température intérieure dans un immeuble refroidi par un système à déshydratant solaire sans source d'énergie thermique supplémentaire [texte imprimé] . - 2012 . - pp. 695-704. Langues : Anglais (eng) in Revue internationale du froid > vol 32, issue 4 (2009) . - pp. 695-704 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Conditionnement d'air; Système à déshydratant; Énergie solaire; Bureau; Modélisation; Simulation; Température; Performance Index. décimale : 621.5 Technique pneumatique, du vide, des basses températures Résumé : The performance of a once-through solar desiccant cooling system, for air-conditioning a commercial office space, was modelled using the TRNSYS computer simulation software package. The study particularly focused on the potential for designing and operating a desiccant cooling system, without any thermal backup provided to mitigate for intermittent solar availability in three Australian cities. Increasing (i) indirect evaporative cooler effectiveness, (ii) air flow to the office space, and (iii) solar collector area were all shown to reduce the frequency of high temperature events inside the building occupied space. In the warm temperate climate of Melbourne (and to a lesser extent Sydney), high ventilation rates enabled comfort conditions to be maintained at or near acceptable levels in the occupied space, without the use of a backup thermal source. The synergy between evaporative cooling and solar desiccant cooling, observed in the warm temperate climates, was not evident in the tropical Darwin climate, suggesting that the selected ventilation desiccant cooling cycle is not appropriate for tropical climates.