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

Technical Report · Wed Sep 01 00:00:00 EDT 1982

DOI:https://doi.org/10.2172/6918682· OSTI ID:6918682

Huber, H D; Fassbender, L L; Bloomster, C H

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. 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.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6918682
• Report Number(s): PNL-4422-Vol.1; ON: DE82022512
• Country of Publication: United States
• Language: English

Related Subjects

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