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Title: User manual for GEOCITY: a computer model for cost analysis of geothermal district-heating-and-cooling systems. Volume I. Main text

The purpose of this model is to calculate the costs of residential space heating, space cooling, and sanitary water heating or process heating (cooling) using geothermal energy from a hydrothermal reservoir. The model can calculate geothermal heating and cooling costs for residential developments, a multi-district city, or a point demand such as an industrial factory or commercial building. GEOCITY simulates the complete geothermal heating and cooling system, which consists of two principal parts: the reservoir and fluid transmission system and the distribution system. The reservoir and fluid transmission submodel calculates the life-cycle cost of thermal energy supplied to the distribution system by simulating the technical design and cash flows for the exploration, development, and operation of the reservoir and fluid transmission system. The distribution system submodel calculates the life-cycle cost of heat (chill) delivered by the distribution system to the end-users by simulating the technical design and cash flows for the construction and operation of the distribution system. Geothermal space heating is assumed to be provided by circulating hot water through radiators, convectors, fan-coil units, or other in-house heating systems. Geothermal process heating is provided by directly using the hot water or by circulating it through a process heat exchanger.more » Geothermal space or process cooling is simulated by circulating hot water through lithium bromide/water absorption chillers located at each building. Retrofit costs for both heating and cooling applications can be input by the user. The life-cycle cost of thermal energy from the reservoir and fluid transmission system to the distribution system and the life-cycle cost of heat (chill) to the end-users are calculated using discounted cash flow analysis.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
6918682
Report Number(s):
PNL-4422-Vol.1
ON: DE82022512
DOE Contract Number:
AC06-76RL01830
Resource Type:
Technical Report
Research Org:
Pacific Northwest Lab., Richland, WA (USA)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL AIR CONDITIONING; COMPUTER CODES; MANUALS; GEOTHERMAL DISTRICT HEATING; GEOTHERMAL HEATING SYSTEMS; ABSORPTION REFRIGERATION CYCLE; COMPUTERIZED SIMULATION; G CODES; GEOTHERMAL PROCESS HEAT; GEOTHERMAL SPACE HEATING; LIFE-CYCLE COST; MATHEMATICAL MODELS; AIR CONDITIONING; COST; DISTRICT HEATING; DOCUMENT TYPES; ENERGY; ENERGY SYSTEMS; GEOTHERMAL HEATING; HEAT; HEATING; HEATING SYSTEMS; PROCESS HEAT; SIMULATION; SPACE HEATING Geothermal Legacy 151000* -- Geothermal Energy-- Direct Energy Utilization